Journal articles: 'Adsorption de colorants'

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Xi, Desheng, Xiaojuan Deng, Huijun Li, and Pei Yao. "Preparation and Characterization of Fe3O4@nSiO2@mSiO2–NH2 Core–Shell Microspheres for Extracting Allura Red from Aqueous Solution." Nano 10, no. 08 (November 23, 2015): 1550122. http://dx.doi.org/10.1142/s1793292015501222.

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Allura red (AR) is a water-soluble synthetic colorant often used as an additive in the food industry, but excess AR can be harmful to human health. In this work, we report the development of a new removal method for AR by using amino-functionalized microspheres with Fe3O4 cores and twolayer shells composed of SiO2 particles and perpendicularly aligned mesoporous SiO2 (designated Fe3O4@nSiO2@mSiO2–NH2). The material exhibits good dispersibility in aqueous solutions and a high saturation magnetization of 45.68[Formula: see text]emu[Formula: see text]g[Formula: see text], and can be magnetically separated efficiently with an external magnet. Importantly, the material has great adsorption capacity of 29.6[Formula: see text]mg[Formula: see text]g[Formula: see text] for AR and the capacity for reuse with a simple treatment. The adsorption process is very fast and the kinetics data are consistent with a pseudo-second order model. Based on these, a rapid and efficient method for extraction and analysis of AR in water and soft drinks has been established.

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Vinod, Konaghatta Narayanachar, Puttaswamy, Kurikempanadoddi Ningegowda Ninge Gowda, and Rajagopal Sudhakar. "Natural colorant from the bark of Macaranga peltata: kinetic and adsorption studies on silk." Coloration Technology 126, no. 1 (February 11, 2010): 48–53. http://dx.doi.org/10.1111/j.1478-4408.2009.00228.x.

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Alshahrani, Aisha A., Ali Q. Alorabi, M. Shamshi Hassan, Touseef Amna, and Mohamed Azizi. "Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent." Nanomaterials 12, no. 15 (August 7, 2022): 2713. http://dx.doi.org/10.3390/nano12152713.

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The current research intended to employ a facile and economical process, which is also ecofriendly to transform camel waste bones into novel heterostructure for cleansing of diverse waste waters. The bones of camel were utilized for preparation of hydroxyapatite by hydrothermal method. The prepared hydroxyapatite was applied to the synthesis of cerium oxide-hydroxyapatite coated with natural polymer chitosan (CS-HAP-CeO2) heterostructure. Being abundant natural polymer polysaccharide, chitosan possesses exceptional assets such as accessibility, economic price, hydrophilicity, biocompatibility as well as biodegradability, therefore style it as an outstanding adsorbent for removing colorant and other waste molecules form water. This heterostructure was characterized by various physicochemical processes such as XRD, SEM-EDX, TEM, and FT-IR. The CS-HAP-CeO2 was screened for adsorption of various industrially important dyes, viz., Brilliant blue (BB), Congo red (CR), Crystal violet (CV), Methylene blue (MB), Methyl orange (MO), and Rhodamine B (RB) which are collective pollutants of industrial waste waters. The CS-HAP-CeO2 demonstrated exceptional adsorption against CR dye. The adsorption/or removal efficiency ranges are BB (11.22%), CR (96%), CV (28.22%), MB (47.74%), MO (2.43%), and RB (58.89%) dyes. Moreover, this heterostructure showed excellent bacteriostatic potential for E. coli, that is liable for serious waterborne diseases. Interestingly, this work revealed that the incorporation of cerium oxide and chitosan into hydroxyapatite substantially strengthened antimicrobial and adsorption capabilities than those observed in virgin hydroxyapatite. Herein, we recycled the unwanted camel bones into a novel heterostructure, which assists to reduce water pollution, mainly caused by the dye industries.

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Mahjoub, Borhane, Mohamed Chaker Ncibi, and Mongi Seffen. "Adsorption d'un colorant textile réactif sur un biosorbant non-conventionnel : Les fibres dePosidonia oceanica (L.) delile." Canadian Journal of Chemical Engineering 86, no. 1 (2008): 23–29. http://dx.doi.org/10.1002/cjce.20005.

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Komal, Kanu Gupta, Simranjeet Kaur, Jasleen Kaur, Anupama Kaushik, and Sonal Singhal. "A comparative analysis of source based distinctly functionalized nanostructured cellulose for the adsorptive removal of toxic colorants." Cellulose 26, no. 3 (December 14, 2018): 1703–24. http://dx.doi.org/10.1007/s10570-018-2191-7.

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Amelia, Shinta, and Maryudi Maryudi. "Application of Natural Zeolite in Methylene Blue Wastewater Treatment Process by Adsorption Method." Jurnal Bahan Alam Terbarukan 8, no. 2 (December 31, 2019): 144–47. http://dx.doi.org/10.15294/jbat.v8i2.22480.

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Textile industry waste contains dyes that are difficult to decompose naturally and cause disruption of ecosystems in water. The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is so stable that it is difficult to decompose naturally and is harmful to the environment in large concentrations. Therefore, we need a waste treatment technology that can reduce the concentration of dye waste in water. So far, the adsorption method remains the most efficient and effective technique in removing dyes because of its relatively large adsorption capacity. One method that can be used is the adsorption method using natural zeolite. Zeolite is one of the non-metal mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of natural zeolite in absorbing methylene blue with variations in the concentration of methylene blue and various sizes of natural zeolite mesh. The procedures in this experiment include, the preparation of natural zeolite with size variations of 20-60 mesh, 60-100 mesh and> 100 mesh and variations in the concentration of methylene blue used 15 ppm, 30 ppm and 45 ppm with contact time from 0 to 180 minutes. From the results of the study it was found that the smaller the size of natural zeolite used, the greater the percentage of dye removal that is at mesh size> 100 mesh the percentage of dye removal was 32.11%. As for the variation of the concentration of methylene blue, the smaller the concentration, the natural zeolite can work optimally ie at a concentration of 15 ppm at 180 minutes the remaining methylene blue concentration of 0.145 ppm.

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Sayah, Naima, Abdellah Bakhti, and Nathalie Fagel. "Étude de l’adsorption du rouge de chlorophénol sur une hydrotalcite calcinée." Revue des sciences de l’eau 30, no. 2 (January 22, 2018): 103–12. http://dx.doi.org/10.7202/1042921ar.

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L’élimination de la couleur de solutions aqueuses du rouge de chlorophénol a été étudiée par adsorption sur une hydrotalcite de synthèse calcinée. Le solide [Mg-Al-CO3] a été préparé par coprécipitation à pH constant et selon un rapport molaire Mg/Al = 2. Les études par diffraction des rayons X et spectroscopie infrarouge à transformée de Fourier (FTIR) ont montré que le matériau obtenu correspond aux composés de type hydrotalcite avec une bonne cristallinité. L’interaction de ce matériau avec le colorant montre que la cinétique d’adsorption est rapide et suit une expression de vitesse d’adsorption du second ordre. Les influences du pH, de la concentration de l’adsorbant, de la concentration en rouge de chlorophénol de la solution et d’ions compétiteurs tels que chlorure et carbonate ont été étudiées afin d’optimiser l’adsorption. Le traitement de solutions contenant de 0,015 à 1,5 mmol ∙L-1 de rouge de chlorophénol a donné des résultats prometteurs. La capacité d’adsorption de l’hydrotalcite calcinée est d’environ 1,7 mmol∙g-1. Les hydrotalcites calcinées pourraient constituer d’intéressants supports pour le piégeage du rouge de chlorophénol.

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Carrasquero, Sedolfo, Altamira Rosa Díaz Montiel, and Gilberto De Jesus Colina Andrade. "CAPACIDAD ADSORTIVA DEL CARBÓN ACTIVADO OBTENIDO DEL EPICARPIO DE Citrus sinensis EN LA REMOCIÓN DE INDIGOTINA." Revista Bases de la Ciencia. e-ISSN 2588-0764 7, no. 1 (January 1, 2022): 1. http://dx.doi.org/10.33936/rev_bas_de_la_ciencia.v7i1.3511.

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La industria textil genera efluentes altamente coloreados y constituidos por compuestos difícilmente biodegradables. En esta investigación se evaluó la capacidad adsortiva del carbón activado preparado a partir del epicarpio de Citrus sinensis en la remoción del colorante azul índigo (indigotina). El carbón se obtuvo mediante un proceso de activación química del precursor con H3PO4 al 40% durante 1 h. Posteriormente, se caracterizó por medio de los parámetros: densidad aparente, humedad, cenizas e índice de yodo. Se comparó la capacidad adsortiva del carbón de Citrus sinensis (CACN) con un carbón comercial (CAC), mediante la realización de ensayos por carga. El carbón activado preparado a partir de las cáscaras de naranja presentó una densidad aparente de 0,459 g/mL, lo que indica que puede ser utilizado en procesos de adsorción por carga debido a su alta resistencia mecánica. Los resultados del proceso de adsorción se ajustaron mejor al modelo de Freundlich, ya que existió una mejor linealidad y una menor dispersión de los datos experimentales; así como bajos valores de la suma de los cuadrados de los errores relativos. Se obtuvieron porcentajes de remoción de indigotina para el carbón activado de cáscaras de naranja y el carbón activado comercial de 70,35% y 88,78%, con dosis óptimas de 8 y 2 g/L tratando aguas sintéticas con concentraciones iniciales de 67 y 37 mg indigotina/L, respectivamente, lo que indica que estos materiales adsorbentes pueden de ser empleados en el tratamiento de efluentes textiles para la reducción del azul índigo. Palabras clave: adsorción, carbón activado, cáscaras de naranja, indigotina. Abstract The textile industry generates highly colored effluents made up of hardly biodegradable compounds. The adsorptive capacity of activated carbon prepared from the epicarp of Citrus sinensis in the removal of indigo blue dye (indigotine) was evaluated in this research. The carbon was obtained through a process of chemical activation of the precursor with H3PO4 (40%) during one hour. The activated carbon obtained was characterized by the parameters: density, humidity, ash and iodine index. The adsorptive capacity of Citrus sinensis carbon (CACN) with a commercial carbon (CAC) was compared by carrying out batch tests. Activated carbon prepared from orange peels presented an apparent density of 0.459 g/mL, which indicates that it can be used in charge adsorption processes due to its high mechanical resistance. The results of the adsorption process were better adjusted to the Freundlich model, given the better linearity and a smaller dispersion of the experimental data; as well as low values of the sum of the squares of the relative errors. Indigotine removal percentages were obtained for activated charcoal from orange peel and commercial activated carbon of 70.35 % and 88.7 8%, with optimal doses of 8 and 2 g/L treating synthetic waters with initial concentrations of 67 and 37 mg indigotine/L, respectively, which indicates that these adsorbent materials can be used in the treatment of textile effluents for the reduction of indigo blue. Keywords: physicochemical treatment, coagulation, industrial wastewater, effluent, bentonite, ferric chloride, aluminum sulfate.

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Alghamdi, Ahmad H., Hamed M. Alshammery, Mohamed A. Abdalla, and Ali F. Alghamdi. "Determination of Carmine Food Dye (E120) in Foodstuffs by Stripping Voltammetry." Journal of AOAC INTERNATIONAL 92, no. 5 (September 1, 2009): 1454–59. http://dx.doi.org/10.1093/jaoac/92.5.1454.

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Abstract The behavior of the food colorant agent carmine (E120) was studied by square-wave adsorptive stripping voltammetry (SW-AdSV) at the hanging mercury drop electrode. It was observed that carmine gave a sensitive stripping voltammetric peak at 350 mV in pH 3 acetate buffer. The cyclic voltammetric technique was also used to characterize the electrochemical reduction process of carmine. The adsorptive voltammetric signal was evaluated with respect to various experimental conditions, and the optimized values were supporting electrolyte, acetate buffer; buffer acidity, pH 3; dye concentration, 3 107 M; accumulation time, 150 s; accumulation potential, 0.2 V; scan rate, 300 mV/s; pulse amplitude, 185 mV; SW frequency, 20 Hz; working electrode area, 0.6 mm2; and convection rate, 2600 rpm. The SW-AdSV peak currents depended linearly on the concentration of carmine from 5 108 to 1.25 107 mol/L (r 0.99). A detection limit of 1.43 109 mol/L with an RSD of 2.2 and a mean recovery of 97.9 were obtained. Possible interferences by several substances usually present in food products such as food additive dyes (E102, E100, E123, E127, and E129), artificial sweeteners, preservatives, and antioxidants were also evaluated. The proposed electrochemical procedure was successfully applied to the determination of carmine food dye in spiked commercially available ice cream and soft drinks.

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Monroy-Cárdenas, Matías, Oscar Forero-Doria, Ramiro Araya-Maturana, and Maximiliano Martínez-Cifuentes. "An Experimental and Theoretical Study of Dye Properties of Thiophenyl Derivatives of 2-Hydroxy-1,4-naphthoquinone (Lawsone)." Materials 14, no. 19 (September 26, 2021): 5587. http://dx.doi.org/10.3390/ma14195587.

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A prospective study of the dye properties of non-toxic lawsone thiophenyl derivatives, obtained using a green synthetic methodology allowed for the description of their bathochromic shifts in comparison to those of lawsone, a well-known natural pigment used as a colorant that recently also has aroused interest in dye-sensitized solar cells (DSSC). These compounds exhibited colors close to red, with absorption bands in visible and UV wavelength range. The colorimetric study showed that these compounds exhibited a darker color than that of lawsone within a range of colors depending on the substituent in the phenyl ring. Computational calculations employing Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TD-DFT), showed that the derivatives have lower excitation energies than lawsone, while the alignment of their frontier orbitals regarding the conduction bands of TiO2 and ZnO and the redox potential of the electrolyte I−/I3− suggests that they could be employed as sensitizers. The study of the interactions of the lawsone and a derivative with a TiO2 surface model by different anchoring modes, showed that the adsorption is thermodynamically favored. Natural bond orbital (NBO) analysis indicates a two-center bonding (BD) O-Ti as the main interaction of the dyes with TiO2.

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Kifuani, Kifline Milebudi, Anatole Kifuani Kia Mayeko, Philippe Noki Vesituluta, Bernard Ilinga Lopaka, Gracien Ekoko Bakambo, Blaise Mbala Mavinga, and Jérémie Muswema Lunguya. "Adsorption d’un colorant basique, Bleu de Méthylène, en solution aqueuse, sur un bioadsorbant issu de déchets agricoles de Cucumeropsis mannii Naudin." International Journal of Biological and Chemical Sciences 12, no. 1 (June 1, 2018): 558. http://dx.doi.org/10.4314/ijbcs.v12i1.43.

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"Feasibility of spent macroalgae biochar for removal of Acid Red 88 (AR) dye from its aqueous solution." Global NEST: the international Journal, June 12, 2022. http://dx.doi.org/10.30955/gnj.004322.

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<p>Biochar was synthesized from Kappaphycus alvarezii reject (KR) remove the anionic azo dye, Acid Red 88 from wastewater. In this study, biochar was experimented in both batch and column adsorption studies. Batch adsorption studies were performed at varying temperature (25 – 40 °C), dosage (1 – 10 g), pH (4 – 10), time (30 – 90 min) and dye concentration (25 – 125 mg/L) respectively. From the batch adsorption studies, it was seen that maximum removal efficiency was 87.64% at 75ppm, dosage of 4 g/L, time of 60 min and pH 7 respectively. The batch adsorption experiment best fitted to Freundlich isotherm model with Pseudo-second-order kinetics indicating the adsorption to follow chemisorption mechanism process along with multilayer adsorption onto biochar’s uneven adsorption sites. It was clear from this study, that Kappaphycus alvarezii reject has the potential to serve as economical biochar as it can be utilized as an adsorbent for the efficient removal of colorants from wastewater.</p>

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Ren, Na, Conghui Wang, Zhuo Zhao, Cailing Cheng, Wei Wei, and Guotong Qin. "Extraction of betacyanins from Hylocereus polyrhizus (dragon fruit) peel and further enrichment by adsorption." International Journal of Food Engineering, October 22, 2020. http://dx.doi.org/10.1515/ijfe-2020-0037.

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AbstractMixtures of water and ethanol were tested for the extraction of betacyanins from Hylocereus polyrhizus peel to obtain natural colorants. In order to obtain betacyanins in a purified form, adsorption was carried out with two types of multi-walled carbon nanotubes (MWCNTs; pristine MWCNTs and carboxylated MWCNTs) and two macroporous resins (X-5 and AB-8). Carboxylated MWCNTs showed the highest adsorption capacity. On the basis of static adsorption test, carboxylated MWCNTs were selected for kinetic and isotherm studies. Langmuir and pseudo-first-order models could describe the process well. According to the Langmuir model, the maximum monolayer adsorption amount of carboxylated MWCNTs was 84.6 mg/g. After purification on a chromatographic column packed with carboxylated MWCNTs, the content of H. polyrhizus peel betacyanins in the pigment product was 4.62%.

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Harpreet, Kaur, and Vandana Kamboj. "Bioremediation of organic dyes using combination of plants ash." Foods and Raw Materials, October 31, 2019, 240–46. http://dx.doi.org/10.21603/2308-4057-2019-2-240-246.

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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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Journal articles on the topic 'Adsorption de colorants'

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