Journal articles: 'Adsorption de colorants'

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Hiawi, Furat A., and Inaam H. Ali. "Study the Interaction Adsorptive Behavior of Sunset Yellow Dye and Loratadine Drug: Kinetics and Thermodynamics Study." Ibn AL-Haitham Journal For Pure and Applied Sciences 36, no. 1 (January 20, 2023): 186–96. http://dx.doi.org/10.30526/36.1.2974.

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The performance of drug treatment and assessments of different drugs' side effects both can be affected by the interaction between food additives and drugs. Organic compounds such as food colorants dyes are utilized as additives in a wide range of foods. In this study, the adsorption interaction behavior between the colorant food dye sunset yellow (SY) and the drug loratadine was examined. The adsorption procedure is conducted at different drug dosages, various SY dye concentrations, and different temperature (288-318K). The equilibrium data were explained by using Freundlich and Langmuir adsorption isotherms, but Langmuir offering the best fit model. Kinetics adsorptive behavior of sunset yellow on loratadine matched pseudo-second order kinetics. Thermodynamics study show that the process is exothermic, spontaneous and the disorder at the solid-solution interface was proven from the negative entropy (-140.556 J/ K.mol) of adsorption process.

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Mansour, Hedi Ben, Oualid Boughzala, dorra Dridi, Daniel Barillier, Leila Chekir-Ghedira, and Ridha Mosrati. "Les colorants textiles sources de contamination de l’eau : CRIBLAGE de la toxicité et des méthodes de traitement." Revue des sciences de l’eau 24, no. 3 (November 28, 2011): 209–38. http://dx.doi.org/10.7202/1006453ar.

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Les colorants sont largement utilisés dans les imprimeries, les produits alimentaires, cosmétiques et cliniques, mais en particulier dans les industries textiles pour leur stabilité chimique et la facilité de leur synthèse et leur variété de couleurs. Cependant, ces colorants sont à l’origine de la pollution une fois évacués dans l’environnement. La production mondiale des colorants est estimée à plus de 800 000 t•an-1et les colorants azoïques sont majoritaires et représentent 60-70 %. Compte tenu de la composition très hétérogène de ces derniers, leur dégradation conduit souvent à la conception d’une chaîne de traitement physique-chimique et biologique assurant l’élimination des différents polluants par étapes successives. Dés études ont montré que plusieurs colorants azoïques sont toxiques et mutagènes et le traitement biologique de ces colorants semble présenter un intérêt scientifique majeur. Les traitements physico-chimiques communs (adsorption, coagulation/floculation, précipitation etc.) sont couramment utilisés pour les effluents industriels. Malgré leur rapidité, ces méthodes se sont avérées peu efficaces compte tenu des normes exigées sur ces rejets. Le traitement biologique constitue une alternative fiable; en effet, plusieurs microorganismes sont capables de transformer les colorants azoïques en sous-produits incolores. Les bactéries dégradent les colorants azoïques en deux étapes : un clivage de liaison azo, par l’intermédiaire de l’azoréductase, suivi d’une oxydation des amines aromatiques formées lors de la première étape. L’azoréduction constitue alors une étape clé du traitement des effluents chargés de ces colorants.

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Marzec, Anna, Bolesław Szadkowski, Jacek Rogowski, Waldemar Maniukiewicz, Przemysław Rybiński, and Mirosława Prochoń. "New Organic/Inorganic Pigments Based on Azo Dye and Aluminum-Magnesium Hydroxycarbonates with Various Mg/Al Ratios." Materials 12, no. 8 (April 25, 2019): 1349. http://dx.doi.org/10.3390/ma12081349.

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This study set out to investigate the impact of aluminum-magnesium hydroxycarbonates (LHs) with various Mg/Al ratios on the formation of hybrid pigments. The colorants were also evaluated for their flame-retardant properties. In the first part of the study, the hybrid pigments were submitted to comprehensive characterization using time-of-flight secondary ion mass spectrometry (TOF-SIMS), 27Al solid-state nuclear magnetic resonance (NMR) spectroscopy, powder X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), and N2 adsorption as well as scanning and transmission electron microscopy (SEM/STEM). The relationship between the Mg/Al ratios of the LH carriers and the formation of lake pigments was explored. The TOF-SIMS spectrum of LH modified with azo chromophore (AC) showed an intense peak for the C19H15O5N2Mg+ ion, confirming metal-dye interactions. Incorporation of the organic colorant into the LH host enhanced its resistance to dissolution in organic solvent (butyl acetate), as well as improving its color stability under elevated temperatures. The second part of the study evaluated the flammability of ethylene-norbornene (EN) composites, in which the pigments had been applied as colorants. Cone calorimetry revealed that addition of the organic-inorganic pigments resulted in a substantial improvement of the flame retardancy, reflected by the decreased values of the heat release rate (HRRMAX) and total heat release parameter (THR) of the EN composites in comparison to a neat sample (unfilled EN).

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Wang, Cheng, Mengying Luo, Caifeng Xie, Kai Li, Fangxue Hang, Changrong Shi, and William O. S. Doherty. "Effective Adsorption of Colorants from Sugarcane Juice by Bagasse-Based Biochar-Hydroxyapatite Composite." Foods 11, no. 14 (July 21, 2022): 2171. http://dx.doi.org/10.3390/foods11142171.

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The clarification of sugarcane juice is a crucial stage in the sugar manufacturing process, as it affects evaporator performance, sugar quality and yield. The emergence of environmentally friendly and efficient adsorption technology has resulted in widespread interest in carbon-based materials. However, their low adsorption capacity and reusability make them unsuitable for processing sugarcane juice. Here, we provide a cost-effective and sustainable method to dope hydroxyapatite (HAP) nanoparticles on porous carbon (BBC) derived from sugarcane bagasse (BBC-HAP). The composite shows excellent adsorption capacity for color extract from sugarcane juice of 313.33 mg/g, far more effective than the commercially available carbon-based adsorbents. Isotherm studies show that the adsorption of BBC-HAP composite to the colorants is a monolayer process. The pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models demonstrate that the adsorption process is dominated by chemisorption and supplemented by physical adsorption.

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Srivatsav, Prithvi, Bhaskar Sriharsha Bhargav, Vignesh Shanmugasundaram, Jayaseelan Arun, Kannappan Panchamoorthy Gopinath, and Amit Bhatnagar. "Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review." Water 12, no. 12 (December 18, 2020): 3561. http://dx.doi.org/10.3390/w12123561.

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Dyes (colorants) are used in many industrial applications, and effluents of several industries contain toxic dyes. Dyes exhibit toxicity to humans, aquatic organisms, and the environment. Therefore, dyes containing wastewater must be properly treated before discharging to the surrounding water bodies. Among several water treatment technologies, adsorption is the most preferred technique to sequester dyes from water bodies. Many studies have reported the removal of dyes from wastewater using biochar produced from different biomass, e.g., algae and plant biomass, forest, and domestic residues, animal waste, sewage sludge, etc. The aim of this review is to provide an overview of the application of biochar as an eco-friendly and economical adsorbent to remove toxic colorants (dyes) from the aqueous environment. This review highlights the routes of biochar production, such as hydrothermal carbonization, pyrolysis, and hydrothermal liquefaction. Biochar as an adsorbent possesses numerous advantages, such as being eco-friendly, low-cost, and easy to use; various precursors are available in abundance to be converted into biochar, it also has recyclability potential and higher adsorption capacity than other conventional adsorbents. From the literature review, it is clear that biochar is a vital candidate for removal of dyes from wastewater with adsorption capacity of above 80%.

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Wahshi, Fatima Sbait, Maitha Dhaiman Alqahtani, Manhal Abdulla, Tholkappiyan Ramachandran, Fathalla Hamed, and Thies Thiemann. "Adsorption of Model Dyes on Recycled Silica Gel." Proceedings 48, no. 1 (November 12, 2019): 10. http://dx.doi.org/10.3390/ecws-4-06439.

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Silica gel was used as an adsorbent for dyes in aqueous solutions. Afterwards, the silica gel with the adsorbed dye was heated to 600 °C, at which the dye combusted, leaving behind clean silica gel. This silica gel can be reused in the adsorption process. The operation leaves behind little waste products. It is an optimal procedure for educational and other research laboratories which are working with biological stains, food colorants and some non-commercial dyes.

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Fatima A. Al-Qadri, Fatima A. Al-Qadri, Raiedhah Alsaiari Raiedhah Alsaiari, Mabkhoot Alsaiari Mabkhoot Alsaiari, Iman M. Shedaiwa Iman M. Shedaiwa, Mervate M. M. Mervate M. M., and Esraa M. Musa Esraa M. Musa. "The Adsorption of Full-Fat Almarei Milk Solution Produced in Saudi Arabia on the Surface of Flavylium Cations of Anthocyanins from Grape Peel." Journal of the chemical society of pakistan 44, no. 2 (2022): 98. http://dx.doi.org/10.52568/000999/jcsp/44.02.2022.

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Almarei milk is produced in Saudi Arabia from aqueous solutions; this study investigates its adsorption behavior pertaining to three types of anthocyanin pigments that are used as natural food colorants and adsorbents. The three anthocyanin pigments were extracted from red cabbage (RC), grape peel (GP), and pomegranate peel (PP). The initial dye concentrations were 10–50 mg/L and temperature of the solution was 35 °C. For an equilibrium isotherms and kinetic data wereevaluated using the adsorption isotherms models such as Freundlich and Langmuir models. Theresults which were recorded show that the best adsorption model fit with the experimental data wasLangmuir model in contrast with the Freundlich model. Also more suitable adsorption kineticsmodel was pseudo-second order and intraparticle diffusion models than the first-order reactions. An exothermic nature was found form the results of thermodynamic adsorption for each of thermodynamic parameters like entropy (S◦), (H◦) enthalpy, and free energy (G◦).

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López-Rodríguez, Daniel, Bàrbara Micó-Vicent, Marilés Bonet-Aracil, Francisco Cases, and Eva Bou-Belda. "The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants." International Journal of Molecular Sciences 23, no. 17 (August 26, 2022): 9671. http://dx.doi.org/10.3390/ijms23179671.

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Concerns about the health of the planet have grown dramatically, and the dyeing sector of the textile industry is one of the most polluting of all industries. Nanoclays can clean dyeing wastewater using their adsorption capacities. In this study, as a new finding, it was possible to analyze and quantify the amount of metal ions substituted by anionic dyes when adsorbed, and to determine the optimal amount of nanoclay to be used to adsorb all the dye. The tests demonstrated the specific amount of nanoclay that must be used and how to optimize the subsequent processes of separation and processing of the nanoclay. Hydrotalcite was used as the adsorbent material. Direct dyes were used in this research. X-ray diffraction (XRD) patterns allowed the shape recovery of the hydrotalcite to be checked and confirmed the adsorption of the dyes. An FTIR analysis was used to check the presence of characteristic groups of the dyes in the resulting hybrids. The thermogravimetric (TGA) tests corroborated the dye adsorption and the thermal fastness improvement. Total solar reflectance (TSR) showed increased radiation protection for UV-VIS-NIR. Through the work carried out, it has been possible to establish the maximum adsorption point of hydrotalcite.

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Vinod, K. N., Puttaswamy, K. N. Ninge Gowda, and R. Sudhakar. "Isolation of Natural Colorants from Lagerstroemia indica: Kinetic and Adsorption Studies." Chinese Journal of Chemistry 28, no. 7 (August 2, 2010): 1091–96. http://dx.doi.org/10.1002/cjoc.201090191.

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Mohan, Chandra, Priyanka Kumari, Neeraj Kumari, and Arvind Negi. "Fabrication of Colored Polymeric Membrane Using Clay-Based Nano Pigments of Safranin O (SO) Dye." Membranes 13, no. 7 (June 24, 2023): 619. http://dx.doi.org/10.3390/membranes13070619.

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In the present work, a novel methodology was developed for the fabrication of clay-based nano pigments with enhanced thermal stability and used further as a colorant to prepare polymeric membranes. Initially, the batch extraction studies were performed to analyze the maximum adsorption of Safranin O (SO) dye onto pristine montmorillonite (Mt) and organo montmorillonite (OMt) by varying different parameters like pH, contact time, and concentration. It was confirmed from batch extraction studies that the adsorption efficacy of pristine Mt for SO was found to be more than OMt due to their negatively charged surface. Clay-based nano pigments were fabricated by considering the optimized condition where the maximum uptake of SO was observed and further characterized by XRD, FTIR, TGA, and SEM techniques. XRD studies confirmed the intercalation of SO dye while FTIR spectra revealed surface interaction of the dye with Mt/OMt. TGA studies showed that the clay-based nano pigments had more thermal stability than pure SO. Nano pigments were used as colorants to prepare thin, transparent, and homogeneously dispersed polymeric membranes through the solvent casting method. XRD studies of the polymeric membrane confirmed that the intercalation of poly methylmethacrylate (PMMA) into the interlayer of clay increases interlayer spacing, which was further confirmed by the TEM analysis. The mechanical properties of the PMMA polymeric membrane were also enhanced after the dispersion of clay-based nano pigments.

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Thanh, Nguyen Nhu, Nguyen Thanh Tung, Nguyen Van Anh, Nguyen Thuy Chung, and Nguyen Ngoc Thinh. "Removal of congo red dye from aqueous solution using nano ZnO/chitosan composite." Vietnam Journal of Catalysis and Adsorption 11, no. 4 (December 28, 2022): 57–62. http://dx.doi.org/10.51316/jca.2022.070.

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Nano ZnO/chitosan composite was synthesized using precipitation method. The material was characterized by physicochemical analysis methods including XRD and TEM. The results showed that the spherical and rod-shaped particles were well-dispersed with the average size of 30-40 nm. The ZnO/chitosan composite was applied as an adsorbent to remove congo red from aqueous solution. Equilibrium data fitted well with the Langmuir model. It is assumed that the adsorption process follows the pseudo-second-order kinetics equation. The maximum adsorption capacity was of 281.69 mg/g. This suggested that the material could be a promising adsorbent for colorants removal in aqueous solutions.

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Almoselhy, Rania IM. "Application of nanotechnology for optimization of bleaching efficiency of edible oils." Open Access Journal of Science 5, no. 1 (September 2, 2022): 29–30. http://dx.doi.org/10.15406/oajs.2022.05.00172.

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Nanotechnology is the recent science dealing with materials at the nano-sized (smaller than 100nm). Nanotechnology showed its potential significance in almost all industrial sectors. In the current paper, the potency of nanotechnology was affirmed in the food science and technology, especially in the manufacturing of edible oils which passes many procedures, from which is the most important step of bleaching edible oils to remove colorants and contaminants and enhance the quality parameters of these vital components of the human diet. Bleaching process made use of bleaching earth powder which was converted into the nano-sized and then utilized in the bleaching process of edible oils. Results showed the powerful bleaching efficiency optimized by applying nanotechnology in converting the bleaching earth powder to the nano-sized through mechanical milling processes which resulted in smaller size in nanoscale with more efficient surface area available for adsorption of colorants and contaminants of the edible oils resulting in pure edible oils of superior quality and safety.

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Piaskowski, Krzysztof, Renata Świderska-Dąbrowska, and Paweł K. Zarzycki. "Dye Removal from Water and Wastewater Using Various Physical, Chemical, and Biological Processes." Journal of AOAC INTERNATIONAL 101, no. 5 (September 1, 2018): 1371–84. http://dx.doi.org/10.5740/jaoacint.18-0051.

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Abstract Synthetic dyes or colorants are key chemicals for various industries producing textiles, food, cosmetics, pharmaceutics, printer inks, leather, and plastics. Nowadays, the textile industry is the major consumer of dyes. The mass of synthetic colorants used by this industry is estimated at the level of 1 ÷ 3 × 105 tons, in comparison with the total annual consumption of around 7 × 105 tons worldwide. Synthetic dyes are relatively easy to detect but difficult to eliminate from wastewater and surface water ecosystems because of their aromatic chemical structure. It should be highlighted that the relatively high stability of synthetic dyes leads to health and ecological concerns due to their toxic, mutagenic, and carcinogenic nature. Currently, removal of such chemicals from wastewater involves various techniques, including flocculation/coagulation, precipitation, photocatalytic degradation, biological oxidation, ion exchange, adsorption, and membrane filtration. In this review, a number of classical and modern technologies for synthetic dye removal from industry-originated wastewater were summarized and discussed. There is an increasing interest in the application of waste organic materials (e.g., compounds extracted from orange bagasse, fungus biosorbent, or green algal biomasses) as effective, low-cost, and ecologically friendly sorbents. Moreover, a number of dye removal processes are based on newly discovered carbon nanomaterials (carbon nanotubes and graphene as well as their derivatives).

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Jang, Jung Won, Jee-Hong Lee, Hye Jung Youn, and Hak Lae Lee. "The distribution of poly-DADMAC additive in the inkjet coating layer and its influence on the print quality." BioResources 18, no. 1 (January 3, 2023): 1279–92. http://dx.doi.org/10.15376/biores.18.1.1279-1292.

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Maximizing the functionality of cationic polydiallyldimethylammonium chloride (poly-DADMAC) additive with minimal dosage in inkjet coatings can contribute to both an improvement in quality and a cost reduction. To do this, it is essential to understand how the cationic additive is distributed in the coating layer and how it affects the print quality. This study presents a three-step investigation to enhance the understanding of the distribution of poly-DADMAC, as well as its effect on inkjet print quality. First, the adsorption behavior of poly-DADMAC on silica pigments was investigated by measuring the surface charge of silica and the adsorption of the cationic additive. Second, the influence of poly-DADMAC on the printability of binder films was investigated. Finally, the effect of poly-DADMAC on the print quality of inkjet paper was examined. The addition of poly-DADMAC improved the print quality of the inkjet paper because of the improved holdout of the negatively charged colorants in the ink.

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Roda-Serrat, Maria Cinta, Behnaz Razi Parjikolaei, Mehrdad Mohammadifakhr, Juncal Martin, Birgir Norddahl, and Massimiliano Errico. "A Case Study for the Extraction, Purification, and Co-Pigmentation of Anthocyanins from Aronia melanocarpa Juice Pomace." Foods 11, no. 23 (December 1, 2022): 3875. http://dx.doi.org/10.3390/foods11233875.

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Chokeberry (Aronia melanocarpa) pomace is a by-product from the juice industry very rich in anthocyanins and other bioactive components. Recovery and purification of anthocyanins from the pomace is a viable valorization strategy that can be implemented to produce high-value natural food colorants with antioxidant properties. In this study, chokeberry pomace was subjected to enzyme-assisted extraction using commercial pectinases. The extracts were further purified by adsorption–desorption using an acrylic resin and stabilized by co-pigmentation with ferulic acid. The anthocyanin concentration and antioxidant activity of the extracts were unaffected by the enzymatic treatment at the conditions tested. The total phenolic content of the extracts suffered minor variations depending on the enzyme formulation used, whereas the dissolved solid content increased in all cases. The adsorption–desorption strategy allowed a 96% recovery of the anthocyanins initially present in the extract, whereas the co-pigmentation treatment magnified the intensity of the color in terms of absorbance, and improved the stability during storage up to one month.

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Chand Upadhyay, Sandeep, A. B. Bajpai, and Pardip Kumar. "Water Hyacinth (Eichhornia crassipes l.) as a Potential Adsorbent of Basic Fuchsin Dye." Journal of Plant Science Research 38, no. 2 (February 10, 2023): 847–59. http://dx.doi.org/10.32381/jpsr.2022.38.02.39.

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In textile sector uses a huge volume of water and chemicals, including inorganic compounds, polymers, and organic products. Textiles effluents including different types of dyes like acidic, reactive, basic, disperse, azo, diazo, anthraquinone and metal-complex dye. Textile effluents create chronic ecological problems due to their toxicity, pernicious and carcinogenic characters and, at present, purification process of textile effluents is a critical problem for society. Biosorption process through water hyacinth biomass as a fructuous and inexpensive process for the expel of dyes from textile industrial colorants. In the present study, biosorption of basic fuchsin dye was carried out using different doses of the dried and powdered biomass of water hyacinth. The dose of plant biomass (50mg to 400mg) observed high percentage of adsorption at 20 ppm dye concentration. The results of Freundlich adsorption isotherm showed a better biosorption than Langmuir adsorption model. FTIR spectra of the unloaded and dye loaded biomass showed the change in the surface chemistry of the biosorbent and predicted the role of C=N (Very Strong- VS), C=S (Strong- S), CH2 (Strong-S), CH=CH (Strong- S) groups in the removal of basic fuchsin dye from the aqueous solutions.

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Singla, Shivali, Mukul Mathur, Chetan Singh Chauhan, Sachin Goyal, and M. Junaid. "Formulation and Charcterization of Lake Color Obtained From Red Cabbage." Indian Journal of Pharmaceutical and Biological Research 4, no. 01 (March 31, 2016): 50–56. http://dx.doi.org/10.30750/ijpbr.4.1.6.

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Colorants are mainly used to impart a distinctive appearance to the pharmaceutical dosage forms. The present study was carried out to develop aluminium lake color of a dye obtained from red cabbageusing different adsorbent (s) (Aluminium oxide or aluminium hydroxide or combination of both) in different ratio by simply mixing them to get dye adsorbed onto the surface of adsorbent.Batch Mode studies were carried out for 60 minutes. Aluminiumhydroxide at a concentration level of 30% w/v found to be the choice of adsorbent after optimization because maximum adsorption of dye from reaction mixture after 60 minutes and maximum % yield.After optimization of adsorbent the effect of pH and temperature also studied by formulating lake by varying these two parameters. It was observed that a higher temperature (50oC) and a slight acidic pH (6) favor the adsorption. The lake then characterized for various physicochemical properties like angle of repose, Carr’s index, hausner’s ratio, loss on drying, particle size and limit test for heavy metals. The lake was found to follow pseudo second order kinetics.

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Qin, Zirong, Jinyan Zhang, Ying Liu, Jingtao Wu, Guangli Li, Jun Liu, and Quanguo He. "A Simple but Efficient Voltammetric Sensor for Simultaneous Detection of Tartrazine and Ponceau 4R Based on TiO2/Electro-Reduced Graphene Oxide Nanocomposite." Chemosensors 8, no. 3 (August 19, 2020): 70. http://dx.doi.org/10.3390/chemosensors8030070.

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In this work, we report a simple but efficient voltammetric sensor for simultaneous detection of ponceau 4R and tartrazine based on TiO2/electro-reduced graphene oxide nanocomposites (TiO2/ErGO). TiO2/ErGO nanocomposites were prepared by ultrasonically dispersing TiO2 nanoparticles (TiO2 NPs) into graphene oxide (GO) solution followed by a green in-situ electrochemical reduction. TiO2 NPs were uniformly supported on ErGO nanoflakes, which provides a favorable interface for the adsorption and subsequent oxidation of target analytes. TiO2/ErGO showed remarkable electrocatalytic capacity for the oxidation of ponceau 4R and tartrazine, with minimized oxidation overpotentials and boosted adsorptive striping differential pulse voltammetric (AdSDPV) response peak currents. Under the optimal experimental conditions, the anodic peak currents of ponceau 4R and tartrazine increase linearly with the respective natural logarithm of concentrations from 0.01 to 5.0 μM. The detection limits (LOD = 3σ/s) for ponceau 4R and tartrazine are 4.0 and 6.0 nM, respectively. The extraordinary analytical properties of TiO2/ErGO/GCE are primarily attributed to the synergistic enhancement effect from ErGO nanoflakes and TiO2 NPs. Moreover, the proposed TiO2/ErGO/GCE achieves reliable determination of ponceau 4R and tartrazine in orange juice with excellent selectively, reproducibility and stability. Together with simplicity, rapidness, and low cost, the proposed sensor demonstrates great potential for on-site detection of azo colorants.

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Issa, A. A., H. M. Abdel-Halim, Y. S. Al-Degs, and H. A. Al-Masri. "Application of multivariate calibration for studying competitive adsorption of two problematic colorants on acid-activated-kaolinitic clay." Research on Chemical Intermediates 43, no. 1 (July 11, 2016): 523–44. http://dx.doi.org/10.1007/s11164-016-2638-0.

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Harpreet, Kaur, Kaur Harpreet, Vandana Kamboj, and Vandana Kamboj. "Bioremediation of organic dyes using combination of plants ash." Foods and Raw Materials 7, no. 2 (October 28, 2019): 240–46. http://dx.doi.org/10.21603/2308-4057-2019-1-240-246.

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Water is the most crucial thing to mankind and so its contamination by various agencies is posing a threat to the natural balance. So, in the present work, the efficiency of various adsorbents derived from plant waste, to remove different dyes from aqueous solution was evaluated. Parameters for study were contact time, concentration and pH. Various combinations of plant ashes were used for the study. It was found that adsorbent prepared from the combination of orange peels, pomegranate and banana peels ashes, exhibited good adsorption capacity for methylene blue, congo red and crystal violet. All these dyes were completely removed from the aqueous solution while methyl orange was not removed. Congo red was removed completely within 40 min of contact with the adsorbent while methyl orange took 3 hrs to be removed to the extent of 48% only. The adsorption coefficient of congo red was found to be 2.33 while value for methylene blue and crystal violet was 1 and 1.66 respectively. The characterization of adsorbent was done by Scanning Electron Microscopy and IR spectroscopy. SEM image revealed the surface of adsorbent to be made of differential pores. From the results it became evident that the low-cost adsorbent could be used as a replacement for costly traditional methods of removing colorants from water.

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Niu, Panhong, Xiaojing Liang, Xiaofeng Lu, Shuai Wang, Yijing Li, Licheng Wang, and Yong Guo. "Preparation of magnetic carbonized polyaniline nanotube and its adsorption behaviors of xanthene colorants in beverage and fish samples." Journal of Chromatography A 1605 (November 2019): 460369. http://dx.doi.org/10.1016/j.chroma.2019.460369.

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Kong, Cong, Essy Kouadio Fodjo, Dan Li, Youqiong Cai, Dongmei Huang, Yuan Wang, and Xiaosheng Shen. "Chitosan-based adsorption and freeze deproteinization: Improved extraction and purification of synthetic colorants from protein-rich food samples." Food Chemistry 188 (December 2015): 240–47. http://dx.doi.org/10.1016/j.foodchem.2015.04.115.

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Mohd, Norzila, Wan Hasnidah Wan Osman, Mohd Shahrul Nizam Salleh, Sarifah Fauziah Syed Draman, Nurul Syahirah Abd Kahar, and Muhammad Nursalam Zulkifli. "Application of Response Surface Methodology for Optimization of Methylene Blue Removal by Casuarina equitifolia Leaves Powder." Advanced Materials Research 1113 (July 2015): 745–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.745.

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Dye is a type of colorants that are widely used in many industries. Many dyes are toxic in nature with suspected carcinogenic and mutagenic effects that affect aquatic lives and also human beings. Adsorption process is considered as eco-friendly method to remove color from the aqueous solution compared to other established method. In this study, Casuarina Equitifolia leaves were used as an adsorbent. The Response surface methodology (RSM) was employed, using a central composite design (CCD) to optimize the three important variables, i.e., initial dye concentration, pH of the dye solution and adsorbent dosage in order to remove of methylene blue from aqueous solution. From the analysis of variance (ANOVA), the value (>0.8) of the coefficient of determination (R2) was obtained. The optimal condition was established at pH 6.91, 0.1 g adsorbent dosage and 10ppm initial methylene blue concentration. The removal efficiency was found to be 98.80%. From the findings, it shows that Casuarina Equitifolia leaves powder is suitable to be used as an adsorbent in removal of color from aqueous solution.

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Chen, Hui, Xiaojuan Deng, Guosheng Ding, and Yuanyuan Qiao. "The synthesis, adsorption mechanism and application of polyethyleneimine functionalized magnetic nanoparticles for the analysis of synthetic colorants in candies and beverages." Food Chemistry 293 (September 2019): 340–47. http://dx.doi.org/10.1016/j.foodchem.2019.04.111.

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Osorio, Gabriela Pérez, Ismael Macías Juárez, José Eligio Moisés Gutiérrez Arias, Álvaro Sampieri Croda, and Janette Arriola Morales. "Adsorción de colorantes textiles en agua mediante carbón activado obtenido de serrín y cáscara de limón / Adsorption of textile dyes in water by activated carbon obtained from sawdust and lemon peel." Brazilian Journal of Animal and Environmental Research 4, no. 4 (November 8, 2021): 5703–14. http://dx.doi.org/10.34188/bjaerv4n4-067.

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En este trabajo se realizó la obtención de dos carbones activado a partir de residuos orgánicos; cáscara de limón (CAL) y serrín (CAS) para la remoción de los colorantes azul de metileno (AM) y naranja de metilo (NM) en soluciones acuosas mediante el proceso de adsorción. Se realizaron pruebas de adsorción para determinar el porcentaje de remoción de colorante mediante espectrofotometría UV-Vis. De igual manera, los carbones se caracterizaron mediante espectrofotometría FT-IR (antes y después de las pruebas de adsorción) para determinar los posibles grupos funcionales contenidos en la superficie del material poroso. El CAL y CAS mostraron mayor porcentaje de remoción para el colorante AM. Se encontraron bandas que pueden relacionarse a estiramiento de grupos oxigenados como carbonilos, cetonas, aldehídos o lactonas.

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Batool, Madiha, Walid M. Daoush, and Muhammad Khalid Hussain. "Dye Sequestration Using Biosynthesized Silver Nanoparticles Adsorbent in Aqueous Solutions." Crystals 12, no. 5 (May 5, 2022): 662. http://dx.doi.org/10.3390/cryst12050662.

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Nanomaterials have gained much attention in the field of environmental remediation, largely due to their high surface area-to-volume ratio and other unique physical, chemical, and biological characteristics that emerge due to its size effects. Metallic nanoparticles are traditionally manufactured using wet chemical processes; however, the chemicals utilized are generally hazardous and combustible. The biosynthesis of nanoparticles using a variety of plant resources is considered a green technology because it does not use toxic chemicals. This work focuses on the green synthesis of biogenetic silver nanoparticles and their use in the sequestration of colorants from aqueous solution. The extract of aquatic macrophyte Salvinia molesta (water hyacinth) has been employed to prepare silver nanoparticles by chemical reduction reaction. In the UV-visible spectrum of the synthesized silver nanoparticles, the absorbance peak was detected in the 420–430 nm range. The synthesized silver nanoparticles were used to sequester methylene blue (MB) dye in aqueous solution. About 121.04 mg/g was found as the highest adsorption capacity of methylene blue dye on the silver nanoparticles according to the Langmuir isotherm. It was observed that the experimental results and the pseudo-second order kinetics are in good agreement. As a result, the biosynthesized silver nanoparticle might be a potential adsorbent material in the field of environmental rehabilitation and cleanup.

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Chyau, Charng-Cherng, Chu-Ying Chiu, Hung-Lin Hsieh, David Wang-Chi Hsieh, Chong-Ru Hsieh, Chi-Huang Chang, and Robert Y. Peng. "High-Purity Preparation of Enzyme Transformed Trans-Crocetin Reclaimed from Gardenia Fruit Waste." Plants 11, no. 3 (January 21, 2022): 281. http://dx.doi.org/10.3390/plants11030281.

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The recovery of physiologically bioactive ingredients from agricultural wastes as an abundant and low-cost source for the production of high value-added mutraceuticlas has been recognized and supported for the commercial interests and sustainable managements. In the extraction of geniposide for the development of natural food colorants from the dried fruits of Gardenia jasminoides Rubiaceae, the gardenia fruit waste (GFW) still remaining 0.86% (w/w) of crocins has always been discarded without any further treatments Until now, there was no simple and effective protocol for high-purity trans-crocein (TC) preparation without the coexistence of non-biologically active cis-crocein from GFW. We proposed an effective process to obtain the compound as follows. Crocins were extracted firstly by 50% of ethanol in the highest yield of 8.61 mg/g (w/w) from GFW. After the HPD-100 column fractionation in the collecting of crocins, the conversion ratio of 75% of crocins to crocetins can be obtained from the commercial available enzyme- Celluclast® 1.5 L. The crocins hydrolyzed products, were then separated through the HPD-100 resin adsorption and finally purified with the centrifugal partition chromatography (CPC) in single-step to obtain TC in a purity of 96.76 ± 0.17%. Conclusively, the effective enzyme transformation and purification co-operated with CPC technologies on crocins resulted in a high purity product of TC may be highly application in the commercial production.

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Marwan Shamo Shekho and Najmaldin Ezaldin Hassan. "A review on techniques for the cleaning of wastewater." GSC Advanced Research and Reviews 18, no. 1 (January 30, 2024): 118–28. http://dx.doi.org/10.30574/gscarr.2024.18.1.0005.

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The review thoroughly examines current approaches to wastewater treatment, addressing the urgent worldwide issues of water contamination and shortage. Given that the majority of Earth's surface is covered by water, only a small portion of it is really appropriate for consumption. As a result, billions of people are at risk of experiencing water shortages on a yearly basis. The research examines several therapeutic strategies, including physical, chemical, and biological approaches, with a specific emphasis on their effectiveness, constraints, and current advancements. Adsorption and membrane technology are physical technologies that use developments in nano-sized materials to improve the removal of contaminants. Coagulation/flocculation procedures encounter difficulties in de-colorization and sludge generation, notwithstanding their effectiveness. Chemical techniques such as electrochemical and photo-electrochemical oxidation, Fenton's oxidation, and ozonation demonstrate sophisticated oxidation mechanisms that have the ability to break down pollutants. Nevertheless, the need for continuous improvement arises due to problems such as energy expenses and the generation of by-products. The use of microorganisms for the breakdown of organic colorants is a promising ecologically acceptable solution in the field of biology. Biofilm applications show potential in the treatment of sewage water, highlighting the capacity of microorganisms to adapt and their enzymatic activity. This review highlights the urgent need for ongoing research and technological advancements in order to address the global issue of water scarcity. It emphasizes the importance of incorporating sustainable, cost-effective, and environmentally friendly wastewater treatment solutions into worldwide water management strategies, in order to ensure a resilient future.

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SIRIRAK, Jitnapa, Ployphat SUPPHARATTHANYA, Kedsarin CHANTHA, Sutinee GIRDTHEP, and Supanee CHAYABUTRA. "Eco-friendly lake pigment from sappanwood: Adsorption study and its application as natural colorant for natural rubber toy balloon." Journal of Metals, Materials and Minerals 31, no. 2 (June 27, 2021): 27–37. http://dx.doi.org/10.55713/jmmm.v31i2.1009.

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Due to the awareness of the impact of synthetic dye on human health and the environment, natural dye and lake pigment have attracted considerable attention from researcher. Herein, pink−red lake pigment from sappanwood was prepared using adsorption approach. The effects of initial pH, pH and concentration of brazilein solution, dosage of aluminium hydroxide, and adsorption time on adsorption were also explored. Results showed that the maximum adsorption capacity of 30 mg g-1 was achieved when 0.25%w/v of aluminium hydroxide and 100 mg L-1 of brazilein solution were applied. The adsorption kinetics and adsorption isotherm fitted the pseudo second order model and Langmuir isotherm, respectively. Additionally, this lake pigment can be utilized as a natural colorant for natural rubber toy balloons, which could made toy balloon safer for children than synthetic dye. Thus, our lake pigment can be an alternative choice of safe and environmental friendly colorant for products including toys.

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Alfei, Silvana, Federica Grasso, Valentina Orlandi, Eleonora Russo, Raffaella Boggia, and Guendalina Zuccari. "Cationic Polystyrene-Based Hydrogels as Efficient Adsorbents to Remove Methyl Orange and Fluorescein Dye Pollutants from Industrial Wastewater." International Journal of Molecular Sciences 24, no. 3 (February 2, 2023): 2948. http://dx.doi.org/10.3390/ijms24032948.

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Water pollution from dyes is harmful to the environment, plants, animals, and humans and is one of the most widespread problems afflicting people throughout the world. Adsorption is a widely used method to remove contaminants derived from the textile industry, food colorants, printing, and cosmetic manufacturing from water. Here, aiming to develop new low-cost and up-scalable adsorbent materials for anionic dye remediation and water decontamination by electrostatic interactions, two cationic resins (R1 and R2) were prepared. In particular, they were obtained by copolymerizing 4-ammonium methyl and ethyl styrene monomers (M1 and M2) with dimethylacrylamide (DMAA), using N-(2-acryloylamino-ethyl)-acrylamide (AAEA) as cross-linker. Once characterized by several analytical techniques, upon their dispersion in an excess of water, R1 and R2 provided the R1- and R2-based hydrogels (namely R1HG and R2HG) with equilibrium degrees of swelling (EDS) of 900% and 1000% and equilibrium water contents (EWC) of 90 and 91%, respectively. By applying Cross’ rheology equation to the data of R1HG and R2HG’s viscosity vs. shear rate, it was established that both hydrogels are shear thinning fluids with pseudoplastic/Bingham plastic behavior depending on share rate. The equivalents of -NH3+ groups, essential for the electrostatic-based absorbent activity, were estimated by the method of Gaur and Gupta on R1 and R2 and by potentiometric titrations on R1HG and R2HG. In absorption experiments in bulk, R1HG and R2HG showed high removal efficiency (97–100%) towards methyl orange (MO) azo dye, fluorescein (F), and their mixture (MOF). Using F or MO solutions (pH = 7.5, room temperature), the maximum absorption was 47.8 mg/g in 90′ (F) and 47.7 mg/g in 120′ (MO) for R1, while that of R2 was 49.0 mg/g in 20′ (F) and 48.5 mg/g in 30′ (MO). Additionally, R1HG and R2HG-based columns, mimicking decontamination systems by filtration, were capable of removing MO, F, and MOF from water with a 100% removal efficiency, in different conditions of use. R1HG and R2HG represent low-cost and up-scalable column packing materials that are promising for application in industrial wastewater treatment.

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Labiod, Kotbia, Sabir Hazourli, Marwa Bendaia, Mohamed Tlili, Adel AitBara, Radouane Graine, and Hazem Meradi. "Removal of Azo Dye Carmoisine by Adsorption Process on Diatomite." Adsorption Science & Technology 2022 (September 9, 2022): 1–17. http://dx.doi.org/10.1155/2022/9517605.

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This work aims to evaluate the adsorption capacity of an abundant natural diatomite (ND) to remove the azo dye carmoisine, known as a harmful emerging organic pollutant. Indeed, to the best of our knowledge, no results were reported on this subject. The ND was characterized by FTIR, XRD, and SEM/EDX analyses. The experimental study of adsorption was carried out in batch mode. Results showed that ND adsorbent is mainly composed of silica. A fraction of calcite and ankerite was also identified. It is a porous material with a specific surface of about 41 m2.g-1 and with a hydroxyl surface functional group -OH. Adsorption results showed that adsorption process on ND is found to be effective in removing the carmoisine colorant. The adsorption capacity is strongly affected by the adsorbent and adsorbate contents, the solution pH, the work temperature, and the water hardness and mineralization. At room temperature, optimal experimental conditions for the highest adsorption capacity (12 mg.g-1) were colorant concentration 50mg.L-1, pH 2, contact time 30min, and ND content 1 g.L-1. Modeling study has showed that experimental results are well modeled by the Freundlich isotherm in multilayer adsorption. The reaction kinetics are pseudo-second order, and the thermodynamic parameters indicated that the nature of the adsorption process is endothermic and spontaneous.

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Fakhar, Nida. "Insights of Montmorillonite Clay Nanocomposites for Adsorption of Toxic Colorant and Metals Ions from Wastewater: A Mini Review." Nanomedicine & Nanotechnology Open Access 8, no. 4 (2023): 1–6. http://dx.doi.org/10.23880/nnoa-16000269.

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The development of lowcost adsorbents is triggered often by not utilizing the costly starting material that pave the path for synthesizing cost comparative adsorbents for purpose of sequestration of toxic pollutants from water. Clay minerals are alternatives that are low-cost to activated charcoal due to their abundance presence, excellent textural properties, high specific surface area, strong chemical, and mechanical stability Pollution, in recent years has become an increasingly serious problem, leading to health issues in human and deteriorating environmental condition. Various remediation technologies are introduced so far, but adsorption regarded as important industrial technique for separation and purification of effluent media. This review paper showcases the importance of montmorillonite nanocomposites for the remediation of toxic contaminants from water. The preferred method of remediation is adsorption. It also emphasizes the recent development in the field of montmorillonite nanocomposites in sequestering different types of dyes and various heavy metals from water. Hence, this brief review authorises the various montmorillonite adsorbents conceivability towards water treatment.

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Larabi, Oussama, Afaf Amara-Rekkab, Mohamed Amine Didi, Amel Didi, and Souad Feddane. "Experimental Studies to Optimize Process Parameters for the Removal of Cationic and Anionic Dyes by Natural Cypress Leaves." Journal of the Mexican Chemical Society 68, no. 3 (April 26, 2024): 469–93. http://dx.doi.org/10.29356/jmcs.v68i3.2037.

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Abstract. In this study, cypress leaves were used for the preparation of a biosorbent to remove brilliant green (BG) and black lanasyn (LB) from aqueous solutions. The influence of several experimental factors, such as time of contact, pH, initial concentration, ionic strength, temperature, stirring speed, and particle size, on the adsorption of these dyes was studied. Contact time s'effect has showed that balance was reached at 30 min with adsorption capacities 9.24 and 4.08 mg/g and elimination rates of 95.97 % and 34 % for BG and LB, respectively. Moreover, the study has shown that the adsorption of the two dyes can be described by pseudo-second-order kinetics. The adsorption isotherms demonstrated that the Freundlich model was satisfactory compared with the Langmuir model for describing the process of adsorption of the two dyes on the cypress. The results showed that the adsorption process is spontaneous, feasible, and endothermic for BG and non-spontaneous and exothermic for LB. Multi-docking reflecting the biosorption of brilliant green and Lanasyn black on the adsorbant surface is proposed. On the fundamental plane, the fractional orthogonal Taguchi plane L16 (45) was used to optimize the conditions for brilliant green adsorption on the cypress. In conclusion, the results showed that cypress leaves could be advantageously used as a low-cost biosorbent for the removal of brilliant green and lanasyn black in wastewater treatment. Resumen. En este estudio se usaron hojas de ciprés para preparar un biosorbente que remueve los colorantes verde brillante (BG) y lanasyn negro (LB) de soluciones acuosas. En la adsorción de estos colorantes se estudió la influencia de varios factores experimentales como tiempo de contacto, pH, concentración inicial, fuerza iónica, temperatura, velocidad de agitación y tamaño de partícula. El efecto del tiempo de contacto mostró que el balance se alcanzó a los 30 min con capacidades de adsorción de 9.24 y 4.08 mg/g y velocidades de eliminación de 95.97 % y 34 % para BG y LB, respectivamente. El estudio mostró que la adsorción de los dos colorantes se puede describir por una cinética de pseudo segundo orden. Para describir el proceso de adsorción de los dos colorantes en las hojas de ciprés, las isotermas de adsorción demostraron que el modelo de Freundlich es satisfactorio comparado con el modelo de Langmuir. Los resultados muestran que el proceso de adsorción es espontáneo, factible y endotérmico para BG, y no espontáneo y exotérmico para LB. Se propone un acoplamiento múltiple reflejando la biosorción del verde brillante y el lanasyn negro sobre la superficie del adsorbente. En el aspecto fundamental, la fracción ortogonal del plano de Taguchi L16 (45) se utilizó para optimizar las condiciones de adsorción del verde brillante en las hojas de ciprés. En conclusión, los resultados muestran que las hojas de ciprés pueden utilizarse como biosorbentes de bajo costo para la remoción de verde brillante y lanasyn negro en el tratamiento de aguas residuales.

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Tahina Lalaina, Randrianantoandro, and Herizo Ramanantsoa. "Etude De Mécanisme d’Adsorption Du Colorant d’Indigo Carmin (IC) Sur Du Charbon Actif A Base De Coques De Noix De Coco (CACC)." International Journal of Progressive Sciences and Technologies 39, no. 1 (June 20, 2023): 127. http://dx.doi.org/10.52155/ijpsat.v39.1.5364.

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Résumé—Contexte : Les effluents issus des industries textiles génèrent des charges chimiques importantes, ce qui pose un vrai problème à l’homme et à l’environnement. A Antananarivo, quelques industries textiles déversent leurs eaux usées fortement colorées dans la rivière Ikopa, avec ou sans traitement préalable. Cependant, ces eaux usées ont des impacts majeurs, directs ou indirects, sur la ressource en eau, car elles affectent la qualité de la rivière et les activités des riverains environnants. Objectif : L’objectif de cette étude est d’élaborer une méthode écologique pour éliminer le colorant d’indigo carmin (IC) qui est déversé directement dans la rivière Ikopa après le traitement de jeans (lavage et délavage) d’une entreprise franche. La décoloration a été réalisée par adsorption du colorant sur du charbon actif à base de coques de noix de coco (CACC). Méthode : L’adsorption est effectuée par mise en contact de l’indigo carmin / charbon actif (CACC) en poudre avec une vitesse d’agitation de 120 tr.min-1 . Les influences des paramètres liés aux conditions d’adsorption tels que le temps de contact, la quantité de l’adsorbant, la concentration du colorant ont été examinés. Après les différentes opérations, les échantillons sont ensuite filtrés, centrifugés et sont analysés par un spectrophotomètre UV-Vis à une longueur d’onde de 610 nm. Pour décrire les propriétés du mécanisme d’adsorption, on a aussi déterminé les modèles cinétiques et les modèles d’isotherme d’adsorption du colorant sur le CACC. Résultats : Le colorant d’indigo peut être éliminé à 98, 04 % pour une quantité optimum de 750 mg de charbon actif en poudre dans une solution expérimentale de 100 ml. La quantité de colorant adsorbée par le charbon est de 6,47 mg g-1. Le temps d'équilibre exact est obtenu en 40 minutes. On constate que la capacité d’adsorption augmente avec la masse de charbon grâce à la disponibilité des sites libres. En appliquant les équations cinétiques, on observe que le modèle de pseudo second-ordre décrit davantage l’adsorption de l’indigo carmin sur le CACC avec un coefficient de corrélation élevé (R2= 0,9998) et de qe,calc = 6,85 mg g-1. Le modèle de Freundlich est représentatif du processus d’adsorption du colorant IC, c’est-à-dire que l’adsorption est en multicouche et que la surface de l’adsorbant est hétérogène.Mots-clés: Effluent textile, indigo carmin, adsorption, rivière Ikopa, Antananarivo

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Godoy, Omar. "Systematic review of the cotton dyeing process with reactive dyes to optimize dye kinetics in the adsorption phase." INNOVATION & DEVELOPMENT IN ENGINEERING AND APPLIED SCIENCES 6, no. 2 (July 16, 2024): 15. http://dx.doi.org/10.53358/ideas.v6i2.963.

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La fase de adsorción y la cinética tintórea como elementos correlacionados en un proceso de teñido con colorantes reactivos sobre fibra de algodón son de vital importancia, no solo para el proceso tintóreo como tal, sino que además, un adecuado y consciente uso de los elementos que intervienen en la receta de tintura, la curva de procesos ajustada a las realidades del equipo, maquinaria y procesos, así como una adecuada elección de los colorantes y auxiliares, permitirá tener el mayor aprovechamiento del color sobre la fibra. Es por ello por lo que tras la revisión sistemática de literatura, varios autores abordan estas dos temáticas como elementos fundamentales para ser revisados en un proceso, mismos que aportan en la reducción del tiempo de teñido, la correcta igualación del color sobre la fibra y por sobre todo, permiten tener el mayor aprovechamiento de colorantes y auxiliares, y con ello minimizar la cantidad de desperdicios; y, posteriormente, realizar procesos de recuperación de agua más eficientes, ecológicos y naturales.

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Cao, Jiliang, Chunli Meng, and Hong Zhao. "Dyeing Properties of Berberine on Cationic Dyeable Polyester." AATCC Journal of Research 6, no. 6 (November 1, 2019): 32–37. http://dx.doi.org/10.14504/ajr.6.6.5.

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The natural cationic colorant berberine was used to dye cationic dyeable polyester (CDP) fibers. Its dyeing properties, namely color strength (K/S) of dyed CDP and percent exhaustion (E%) of berberine, on CDP were explored at various dyeing pH levels, temperatures, time, and concentration of berberine. Furthermore, dyeing kinetic and thermodynamic studies were also carried out to evaluate the adsorption properties and mechanism. It was found that theE% of berberine on CDP fibers and the rate of adsorption increased with increasing dyeing temperature, while the influence of pH was extraordinarily small. In addition, the adsorption isotherm of berberine on CDP fibers was in line with the Langmuir model.

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Suditu, Gabriel Dan, Elena Niculina Drăgoi, Alexandra Georgiana Apostică, Andra Maria Mănăilă, Veronica Mădălina Radu, Adrian Cătălin Puițel, and Mircea Teodor Nechita. "Artificial Intelligence-Based Tools for Process Optimization: Case Study—Bromocresol Green Decolorization with Active Carbon." Adsorption Science & Technology 2022 (July 30, 2022): 1–15. http://dx.doi.org/10.1155/2022/8110436.

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This study highlights the benefits of optimizing the decolorization of bromocresol green (a colorant/pH indicator widely used in the industry, whose degradation produces toxic byproducts) by adsorption on active carbon. A set of experiments were planned and performed based on the design of experiments methodology for the following parameters: the colorant concentration (0.009-0.045 g/L), the amount of adsorbent (0.5-3 g/L), and the contact time (60-240 min). Modeling and optimization strategies were employed to determine the working conditions leading to efficiency maximization. Using the response surface methodology, the optimum values of the primary process parameters were established. In addition, a modified bacterial foraging optimization algorithm was applied as an alternative optimizer in combination with artificial neural networks in order to determine multiple combinations of parameters that can lead to maximum process efficiency. Different solutions were obtained with the considered strategies, and the maximum efficiency obtained was >99%. The study emphasizes that adsorption on active carbon is an effective method for bromocresol green decolorization in wastewater that can be further improved using advanced optimization methods.

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Nascimento, Rosiane Ferreira do, Cícero Wellington Brito Bezerra, Hildo Antonio dos Santos Silva, Mário Sérgio Schultz, and Sirlane Aparecida Abreu Santana. "EFFECT OF pH AND IMPROVEMENT IN VIOLET REMAZOL DYE REMOVAL FROM WATER BY Eichhornia Crassipes (water hyacinth)." Cadernos de Pesquisa 20, no. 3 (December 21, 2013): 73. http://dx.doi.org/10.18764/2178-2229.v20n3p73-80.

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Abstract: In this work water hyacinth (Eichhornia crassipes) was used as adsorbent for aqueous Violet Remazol 5R (VR 5) solutions. In order to obtain the best conditions for the removal, the pH influence, time of contact and concentration were verified. The adsorption showed itself highly dependent of the pH, being the maximum adsorption was observed pH 1.0. In the kinetic experiments, the batchwise method was used with concentrations of 250 and 1000 mg dm-³, and after the time of contact the concentration was determined by spectrophotometry. An adequation of the models of pseudo-first and second order was made based on the results that were found. The second order model was the most suitable in both concentrations,with R²= 0.999. The Langmuir, Freundlich, Sips and Temkin models were used to analyze the experimental data in its linearized mode. The Langmuir model was the most appropriate. In the conditions studied, the removal of textile dye Violet Remazol 5R by water hyacinth showed good results, making it possible to use this material as an alternative way to remove dyes from textile effluents.Keywords: Water hyacinth (Eichhornia crassipes). Textile dye. Adsorption. EFEITO DO pH E MELHORIA NA REMOÇÃO DO CORANTE VIOLETA REMAZOL EM ÁGUA POR Eichhornia Crassipes (aguapé)Resumo: Neste trabalho foi utilizado o aguapé (Eichhornia crassipes) como adsorvente de soluções aquosasde Violeta Remazol 5R (VR 5). De modo a obter as melhores condições para a remoção foram verificados,a influência do pH, tempo de contato e a concentração. A adsorção mostrou-se altamente dependente do pH, sendo que a adsorção máxima foi observada pH 1,0. Nas experiências de cinética, o método de batelada foi utilizado nas concentrações de 250 e 1000 mg dm-3, e após o tempo de contato com a concentraçãofoi determinada por espectrofotometria. Uma adequação dos modelos de pseudo-primeira ordem e segunda foi feita com base nos resultados que foram encontrados. O modelo de segunda ordem foi o mais adequado em ambas às concentrações, com R ² = 0,999. Os modelos de Langmuir, Freundlich, Sips e Temkin foram utilizados para analisar os dados experimentais em seu modo linear. O modelo de Langmuir foi o mais adequado. Nas condições estudadas, a remoção de corante têxtil Violeta Remazol 5R por aguapé mostrou bons resultados, tornando possível a utilização deste material como uma forma alternativa para remover corantes de efluentes têxteis.Palavras-chave: Aguapé (Eichhornia crassipes). Corante têxtil. Adsorção. EFECTO DEL pH Y LA MEJORA EN REMOVAL TINTE DE REMAZOL VIOLET DEL AGUA POR Eichhornia Crassipes (jacinto de agua)Resumen: En este trabajo fue utilizado el jacinto de agua (Eichhornia crassipes) como adsorvente para la remoción del colorante textil aniónico Violeta de Remazol 5R de soluciones acuosas. Con el objetivo de encontrar condiciones mas adecuadas para la remoción, se verificó la influencia del pH, tiempo de contactoy concentración. La adsorción se mostró fuertemente dependiente del pH, presentando una adsorción máxima a pH 1,0. Para los experimentos de cinética se utilizou el método de lote en las concentraciones de 250 y 1000 mg dm-3, y después del tiempo de contacto se realizó la determinación de la concentración atraves de espectrofotometria. Con los resultados conseguidos se hizo una adaptación a los modelos de pseudo-primera orden y segunda orden, con R2 = 0,999. Los modelos de Langmuir, Freundlich e Temkin, fueron utilizados para analizar los datos experimentales en su forma linealizada. El modelo que major se adaptó fue el de Langmuir. Bajo las condiciones de estudio, la remoción del colorante textil aniónico Violeta de Remazol 5R por jacinto de agua mostró buenos resultados, lo que permitiria que pueda ser utilizado como una alternativa para la remoción de colorantes en efluentes textiles.Palabras clave: Jacinto de agua (Eichhornia crassipes). Colorante textil. Adsorción.

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Ncibi, Mohamed Chaker, Borhane Mahjoub, and Mongi Seffen. "Adsorption de colorant métallifère par les fibres dePosidonia oceanica." Journal of Environmental Engineering and Science 7, no. 6 (November 2008): 645–50. http://dx.doi.org/10.1139/s08-040.

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Liu, Xueming, Gengsheng Xiao, Weidong Chen, Yujuan Xu, and Jijun Wu. "Quantification and Purification of Mulberry Anthocyanins with Macroporous Resins." Journal of Biomedicine and Biotechnology 2004, no. 5 (2004): 326–31. http://dx.doi.org/10.1155/s1110724304403052.

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Total anthocyanins in different cultivars of mulberry were measured and a process for the industrial preparation of mulberry anthocyanins as a natural food colorant was studied. In 31 cultivars of mulberry, the total anthocyanins, calculated as cyanidin 3-glucoside, ranged from147.68to2725.46mg/L juice. Extracting and purifying with macroporous resins was found to be an efficient potential method for the industrial production of mulberry anthocyanins as a food colorant. Of six resins tested, X-5 demonstrated the best adsorbent capability for mulberry anthocyanins (91 mg/mL resin). The adsorption capacity of resins increased with the surface area and the pore radius. Residual mulberry fruit juice after extraction of pigment retained most of its nutrients, except for anthocyanins, and may provide a substrate for further processing.

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K. Jadhav, Shridhar, and Sanjaykumar R. Thorat. "Adsorption of Azo Dyes Using Biochar Prepared from Regional Crop Waste Material." Biosciences Biotechnology Research Asia 19, no. 1 (March 31, 2022): 141–51. http://dx.doi.org/10.13005/bbra/2973.

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Adsorption of dyes and a colorant using biochar is an emerging technology with environment-friendly and cost-effective applications. In this study, we investigated the adsorption isotherms of Brilliant Blue (BB) and Congo Red (RR) using Biochars prepared from regional plant waste of the Musa acuminata stem at 4500C (BSB 450). A batch experiment study for BB and CR with its initial concentration (1-240 mg/l) contact time (30—240 min) pH (3-10) and dose range (25-450 mg/l) at temperature 303K was carried out. The experimental data follows the Freundlich isotherm for BB and Langmuir isotherm for CR. As per our results adsorption isotherm equilibrium data shows the highest adsorption of BB onto BSB 450 is 175.57 mg/g and CR is 135.15 mg/g in Dubinin–Radushkevich model. The study also shows that BSB 450 is a cost-effective and environment-friendly adsorbent that was used for the treatment of dyes containing effluents like a tannery, textile, and dye waste producing industries.

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Bagane, M. "Elimination d'un colorant des effluents de l'industrie textile par adsorption." Annales de Chimie Science des MatÃ©riaux 25, no. 8 (December 2000): 615–25. http://dx.doi.org/10.1016/s0151-9107(00)90003-5.

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Ulya, Azhma, Edi Nasra, Ali Amran, and Desy Kurniawati. "Adsorpsi Zat Warna Rhodamine B Dengan Karbon Aktif Kulit Durian sebagai Adsorben." Jurnal Periodic Jurusan Kimia UNP 11, no. 2 (August 1, 2022): 74. http://dx.doi.org/10.24036/p.v11i2.113371.

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Rhodamine, B colorant is one of the dyes present in the waste coming from the textile/dyeing industry. Rhodamin B dyes found in waters can cause damage to ecosystems both animals and plants, so a method is needed to overcome the impact of pollution by Rhodamin B waste. One of the most efficient methods is the adsorption method using activated carbon from Durian peels. Adsorption,process is done by using a variation,of pH (2, 3, 4, 5 and 6), and variation of stirring speed (50, 100, 150, 200, 250 rpm). The results showed the absorption capacity at optimum conditions for the absorption of Rhodamine B at pH 4 and stirring speed at 200 rpm with absorption capacity of 24,643 mg/g with absorption percentage 96,0292%.

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Ni, Yongnian, Jieling Bai, and Ling Jin. "Simultaneous adsorptive voltammetric analysis of mixed colorants by multivariate calibration approach." Analytica Chimica Acta 329, no. 1-2 (August 1996): 65–72. http://dx.doi.org/10.1016/0003-2670(96)00038-4.

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Liu, Yuhan, Le Jing, Jiaqi Cui, Dongdong Yuan, and Chengtao Wang. "Preparation of Edible Colorant Lake Using Calcium Carbonate and β-Carotene: Structural Characterization and Formation Mechanism Study." Foods 13, no. 7 (March 29, 2024): 1050. http://dx.doi.org/10.3390/foods13071050.

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This study prepared a novel β-carotene colorant lake using calcium carbonate (CaCO3) and investigated the lake formation process and its basic characteristics. Kinetic adsorption analysis confirmed that medium pH (9.3) and medium temperature (40 °C) were more suitable for lake preparation, while desorption occurred, possibly due to crystalline transformation of CaCO3. The isothermal analysis and model fitting results suggested that the β-carotene and CaCO3 particles combined via a monolayer adsorption process driven by physical force. Electrostatic attraction likely participated in the process due to the net negative surface charges of β-carotene dispersion and positively charged groups on the CaCO3 particle surfaces. Ethanol, ultrasonic treatment, and drying method significantly influenced the immobilization efficiency (IE) of β-carotene in the lake and light stability of the lake, without affecting its crystal form. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) curves confirmed absorption of β-carotene onto CaCO3. Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses indicated no obvious chemical bonds between β-carotene and CaCO3. Energy-dispersive spectroscopy (EDS) confirmed the presence of β-carotene on surfaces but not in the interior of the CaCO3 particles. The adsorption of β-carotene by calcium carbonate was further confirmed to be a physical adsorption on surface.

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Nurfahasdi, Meutia, Seby Sabrina, Amir Husin, Kartini Noor Hafni, Novrida Harpah Hasibuan, Abdugani Rakhmatov, Matluba Turayeva, and Shirin Yuldosheva. "The Effect of Electric Voltage Variation and Flow Rate on Decreasing Remazol Red Rb 133 Dye Levels in a Continuous Electrocoagulation Process." E3S Web of Conferences 497 (2024): 01003. http://dx.doi.org/10.1051/e3sconf/202449701003.

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The usage of synthetic dyes, such as Remazol Red RB 133, benefits the product by boosting its added value, but it also has a negative influence on the aquatic environment when waste water is disposed of directly. As a result, electrocoagulation technology is utilized to lower the levels of Remazol Red RB 133 dye, ensuring that it does not affect the environment. This study seeks to examine the influence of variations in electric voltage (10, 12, 14 volts) and flow rate (80, 100, and 120 mL/minute) on decreasing concentrations of the colorant RB-133 Remazol in the Continuous Electrocoagulation Process. A UV-Vis spectrophotometer will be used to see the dye concentration after the electrocoagulation process and will be analyzed using the adsorption kinetics model and the Langmuir and Freundlich adsorption isotherm models.

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Maryudi, Maryudi, Shinta Amelia, and Siti Salamah. "Removal of Methylene Blue of Textile Industry Waste with Activated Carbon using Adsorption Method." Reaktor 19, no. 4 (December 31, 2019): 168–71. http://dx.doi.org/10.14710/reaktor.19.4.168-171.

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The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> 100 mesh) and variations in the concentration of methylene blue (15 ppm, 30 ppm and 45 ppm) with contact time (0 to 180 minutes). From the results of the study, it was found that the smaller the size of activated carbon used, the greater the adsorption capacity, ie at mesh size> 100 mesh, the adsorption capacity was 9.8%. Whereas, the smaller the concentration of methylene blue, the activated carbon could work optimally at a concentration of 15 ppm at 30 minutes with adsorption capacity as high as 100%.Keywords: adsorption; Methylene Blue; activated carbon; concentration; time; particle size

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Broadhurst, Hugh A., and Peter W. Rein. "Modeling adsorption of cane-sugar solution colorant in packed-bed ion exchangers." AIChE Journal 49, no. 10 (October 2003): 2519–32. http://dx.doi.org/10.1002/aic.690491008.

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Candela, Rossella G., Giuseppe Lazzara, Sonia Piacente, Maurizio Bruno, Giuseppe Cavallaro, and Natale Badalamenti. "Conversion of Organic Dyes into Pigments: Extraction of Flavonoids from Blackberries (Rubus ulmifolius) and Stabilization." Molecules 26, no. 20 (October 17, 2021): 6278. http://dx.doi.org/10.3390/molecules26206278.

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The blackberry’s color is composed mainly of natural dyes called anthocyanins. Their color is red–purple, and they can be used as a natural colorant. Anthocyanins are flavonoids, which are products of plants, and their colors range from orange and red to various shades of blue, purple and green, according to pH. In this study, the chemical composition of an extract obtained from blackberries was defined by LC-ESI/LTQOrbitrap/MS in positive and negative ionization mode. Furthermore, we investigated the adsorption process of blackberry extract using several inorganic fillers, such as metakaolin, silica, Lipari pumice, white pozzolan and alumina. The pigments exhibit different colors as a function of their interactions with the fillers. The analysis of the absorption data allowed the estimation of the maximum adsorbing capacity of each individual filler tested. Through thermogravimetric measurements (TGA), the thermal stability and the real adsorption of the organic extract were determined.

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Yao, Sicong, Massimiliano Fabbricino, Marco Race, Alberto Ferraro, Ludovico Pontoni, Oriella Aimone, and Yao Chen. "Study of the Digestate as an Innovative and Low-Cost Adsorbent for the Removal of Dyes in Wastewater." Processes 8, no. 7 (July 16, 2020): 852. http://dx.doi.org/10.3390/pr8070852.

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Digestate, as an urban solid waste, was considered as an innovative adsorbent for colorant polluted wastewater. Batch adsorption experiments were carried out using digestate as an adsorbent material to remove various dyes belonging to different categories. The removal rate and adsorption capacity of dyes were evaluated and the dose of digestate, contact time, and initial dye concentration were studied. The maximum removal rate was approximately 96% for Methylene Blue. The equilibrium time for the Methylene Blue was 4 h, while for other dyes, a longer contact time was required to reach the equilibrium. The suspicion of colloidal matter release into the solution from solid fraction of the digestate led to the investigation of the consequence of a washing step of the digestate adsorbent upstream the adsorption experiment. Washed and not washed adsorbents were tested and the differences between them in terms of dye removal were compared. Moreover, experimental data were fitted by pseudo-first order, pseudo-second order, and intra-partial diffusion kinetic models as well as Langmuir, Freundlich, and Sips isotherm models. The results from fitted models showed that the adsorption of various dyes onto the digestate was mostly well fitted by the Langmuir isotherm and pseudo-second-order kinetic model.

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Journal articles on the topic 'Adsorption de colorants'

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