Articles de revues : « Green Dyes »

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Wiriya-Amornchai, Atiwat, Nattakarn Hongsriphan et Pajeara Pattanatabutr. « Natural Dyeing of Wood Fibers for Green Biocomposites ». Advanced Materials Research 488-489 (mars 2012) : 511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.511.

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In this study, the mechanical and thermal properties of green biocomposites adding natural dye were investigated by tensile test and Differential Scanning Calorimetry (DSC). Poly(lactic acid), one of biodegradable polymers recently been interested for replacing petroleum-based polymers, was compounded with wood fibers to produce biocomposite, and natural dyes were introduced to improve appearance of biocomposite. Pine wood fibers were dyed with three types of natural dyes; yellow color from heartwood of Jackfruit tree, red color from Sappan wood, and blue color from Indigo blue. Prior compounding, original and dyed wood fibers were treated with silane to improve compatibility between wood fiber and polymer matrix. It is found that %crystallinity of alkali-treated and natural dyed wood/PLA biocomposites were significantly higher than original wood/PLA biocomposites. The modulus and tensile strength of natural dyed wood poly (lactic acid) composites were in the same level of alkali-treated wood composites; however, elongation at break was improved by natural dye.

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Hobson, Debra K., et David S. Wales. « ‘Green’ dyes ». Journal of the Society of Dyers and Colourists 114, n^o 2 (22 octobre 2008) : 42–44. http://dx.doi.org/10.1111/j.1478-4408.1998.tb01944.x.

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Maghfiroh, Maghfiroh, Mutadin Mutadin et Sri Puji Astuti. « ANALISIS KUALITAS DAN KETAHANAN LUNTUR WARNA BATIK HASIL PROSES REUSE SISA LARUTAN CELUP ZAT WARNA SINTETIS GOLONGAN BEJANA MENUJU GREEN INDUSTRY ». Pena Jurnal Ilmu Pengetahuan dan Teknologi 34, n^o 1 (1 avril 2020) : 24. http://dx.doi.org/10.31941/jurnalpena.v34i1.996.

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<p>It has been found the fact that natural dyes are not environmentally friendly dyes if they are directly discharged into the water without undergoing processing. Theoretically, both synthetic dyes and natural dyes have the same opportunity to cause pollution of aquatic ecosystems because they have the same functional groups. So far, natural dyes are considered environmentally friendly not because of the low waste pollutant parameters, but because there is a process of reuse of the remaining dyed water. The process of reusing the remaining dye solution can reduce the volume of liquid waste discharged into the water. This study aims to reuse of the remaining water dyed synthetic of vat dyes for the process of making batik. The quality of the staining results is evaluated by color fastness test on washing and rubbing. The reusing synthetic of vat dyes group is done for coloring cotton fabrics. The fabric color evaluation stage is carried out to test the color intensity and fastness of synthetic dyes of vat dyes group if the dye is reused in the batik process. Color intensity test was carried out by UV-PC spectrophotometer, color fastness test on washing use gray scale, and color fastness test on dry rubbing use staining scale. Based on the color intensity test, the process of reusing the remaining dye solution of the indantren navy blue R is still optimal if used on the same day. Reusing the remaining dye solution the next day gives a large value of color intensity value from the use of the dye solution for the first time. Indantren navy blue R color substances are relatively resistant to hydrolysis reactions during the dissolution process in water.</p>

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Mesrar, F. E., H. Tachallait, O. Cherkaoui, K. Bougrin et R. Benhida. « Green and sustainable dyeing of wool with madder plant of the Moroccan flora ». IOP Conference Series : Materials Science and Engineering 1266, n^o 1 (1 janvier 2023) : 012015. http://dx.doi.org/10.1088/1757-899x/1266/1/012015.

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Abstract Textile industry is evolving towards limiting the use of synthetic dyes due to their environmental and health concerns. Natural dyes are considered the ultimate alternative as it is green and ecofriendly. However, natural dyeing is limited by the use of metal mordants to enhance the colorimetric and fastness behavior of dyed textiles. In this work, madder roots (Rubia Tinctorum) from Morocco were analyzed by mean of HPLC-PDA and used to dye wool yarns. The effect of pre-mordanting with different metal mordants was assessed. Color properties, exhaustion, and fixation rates of dyed wool was also evaluated depending on the mordants.

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Idan, Intidhar J., Luqman C. Abdullah, Thomas SY Choong et Siti Nurul Ain B. Md Jamil. « Equilibrium, kinetics and thermodynamic adsorption studies of acid dyes on adsorbent developed from kenaf core fiber ». Adsorption Science & ; Technology 36, n^o 1-2 (30 juin 2017) : 694–712. http://dx.doi.org/10.1177/0263617417715532.

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Quaternized kenaf core fiber (QKCF) was used as an adsorbent for adsorption of anionic Acid Blue-25 (AB) and anionic Acid Green-25 (AG) dyes. Chemical treatment with (3-chloro-2-hydroxypropyl) trimethylammonium chloride under basic condition was applied in order to alter the surface properties of the raw kenaf core fiber. Adsorption studies were carried out to delineate the effect of initial dye concentration, temperature and pH on removal of dyes. The results show that the percentage removal of Acid Blue-25 and Acid Green-25 dyes were increased by increasing the concentrations of dyes. In addition, the maximum percentage removal was 99.8% and 99.65% for Acid Blue-25 and Acid Green-25, respectively. Langmuir, Freundlich and Temkin isotherm models were applied to analyze the data for dye adsorption at 15℃, 25℃, 35℃, and 45℃. The experimental data were best represented by the Langmuir model with maximum adsorption capacity of 303.03 mg/g and 344.83 mg/g for Acid Blue-25 and Acid Green-25 dyes, respectively, at 15℃, and the kinetic data for both dyes were best represented by the pseudo-second-order kinetic model. Thermodynamic studies indicated that the reactions of Acid Blue-25 and Acid Green-25 dyes were endothermic. It was concluded that QKCF adsorbent can be utilized as an efficient low-cost adsorbent for removal of anionic dyes.

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J. Jalil, A., S. Mahmood, A. H. Abdul Rashid, S. H. Nasir, S. A. Ibrahim et M. R. Ahmad. « Extraction of Eco-Friendly Natural Dyes from Pina Leaves and their Application on Wool Fabrics ». International Journal of Engineering & ; Technology 7, n^o 4.14 (24 décembre 2019) : 382. http://dx.doi.org/10.14419/ijet.v7i4.14.27689.

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Natural dyes comprise of colorants that are obtained from animals or vegetable matters without any chemical processing. Natural dyes can substitute synthetic dye and promotes green technology initiatives in the field of textile dyeing. This study was carried out by extracting dyes from pineapple leaves (Ananas Comosus) using three stage mordanting methods using different mordants namely pre-mordanting, post-mordanting and simultaneous dyeing-mordanting. The mordants used were aluminium potassium sulphate, white vinegar and sodium chloride (NaCl). Wool fabrics were used for dyeing. The strength of colour and K/S values of the dyed fabrics were measured before and after washing. The colourfastness to washing, rubbing and light fastness of the fabrics were conducted to investigate the performance of the dye and mordants. The results indicate that the washing, rubbing and light fastness properties of dyed samples were between good to excellent grades.

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Akter, Humayra, Phillip W. Taylor et Peter Crisp. « Visibility and Persistence of Fluorescent Dyes, and Impacts on Emergence, Quality, and Survival of Sterile Queensland Fruit Fly Bactrocera tryoni (Diptera : Tephritidae) ». Journal of Economic Entomology 113, n^o 6 (27 octobre 2020) : 2800–2807. http://dx.doi.org/10.1093/jee/toaa225.

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Abstract Tephritid flies released in sterile insect technique pest management programs are usually marked with fluorescent dyes so that they can be distinguished from wild flies in monitoring traps. Dyes can have adverse effects on emergence, quality, and survival, which can impact sterile insect technique (SIT) success, and so it is important to identify dyes and doses that maximize marking efficacy while minimizing deleterious effects on fly quality. This study examines the effects of five fluorescent dye products, Fluoro Pink, Fluoro Orange, Stella Green, Arc Chrome, and Astral Pink applied at four dose levels (1, 2, 3, and 4 g/liter) on Queensland fruit fly. All dye products caused a similar dose-dependent reduction in percentage of adult emergence. Incidence of morphological deformity of emerged adults increased with dose, and this trend was similar for all dye products. No effects of dye product or dose were found on survival rates over the first 35 d of adulthood, although females tended to have higher survival than males. Visibility varied with dose and dye product; 1 g/liter dye was less visible than 2, 3, or 4 g/liter, and Stella green had lower visibility than other dyes. All of the tested dyes except for Stella green were similar in all assessed metrics of fly performance and are recommended for use in SIT programs.

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Zhao, Zhong, Chris Hurren, Mingwen Zhang, Liming Zhou, Jihong Wu et Lu Sun. « In Situ Synthesis of a Double-Layer Chitosan Coating on Cotton Fabric to Improve the Color Fastness of Sodium Copper Chlorophyllin ». Materials 13, n^o 23 (26 novembre 2020) : 5365. http://dx.doi.org/10.3390/ma13235365.

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Natural dye’s poor affinity for cotton and poor fastness properties still hinder its applications in the textile industry. In this study, a doubled-layered chitosan coating was cured on cotton fabric to serve as bio-mordant and form a protective layer on it. Under the optimal treatment conditions, the maximum qe (adsorption amount) of the natural dye sodium copper chlorophyllin (SCC) calculated from the Langmuir isothermal model was raised from 4.5 g/kg to 19.8 g/kg. The dye uptake of the treated fabric was improved from 22.7% to 96.4% at 1% o.w.f. dye concentration. By a second chitosan layer cured on the dyed fabric via the cross-linking method, the wash fastness of the cotton fabric dyed with SCC can be improved from 3 to 5 (ISO 105 C-06). The natural source of the biopolymer material, chitosan, and its ability to biodegrade at end of life met with the initial objective of green manufacturing in applying natural dyes and natural materials to the textile industry.

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Shamsheer, Bushra, Tahira Aziz Mughal, Zubaida Yousaf, Nadia Riaz, Arusa Aftab et Maria Zahoor. « Green Synthesis of Dyes and Appliance on Silk by Using Metamordating Technique ». Biological Sciences - PJSIR 64, n^o 2 (6 juillet 2021) : 116–25. http://dx.doi.org/10.52763/pjsir.biol.sci.64.2.2021.116.125.

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The main idea of extracting dyes from plant (natural) sources is to avoid the environmental pollution. Natural dye from plants has been given much interest in recent years due to the threat and harmful effects are used by synthetic dyes and environmental awareness created by researchers. The drawback of synthetic dyes is that they are not durable as they do not completely fix on all kind of fabric and remaining dyestuff drained into rivers, becoming the cause of water pollution as well as they cause diseases in human being like cancer and allergies. On the other hand, natural dyes are eco-friendly and find use in the colouring of textiles, drugs and cosmetics etc. Owing to their non-toxic effects, they are also even used for colouring various food products. Mordents are used in natural dyes which enhance the colour of dye and stick it on fabric. Due to lack of availability of precise technical knowledge on the extracting and dyeing technique, it has not commercially succeeded like the synthetic dyes. Hence, the present study was planned to isolate eco-friendly dyes from the bark of the plants (Ziziphus jujube Mill., Albizialebbeck L., Cordia dichotoma G Forst., Ficus benghalensis L. and Cassia fistula L.) and the roots of Ficus benghalensis L. Later on the dyes were applied on silk fabric by using metamordating technique. Then fastness properties like rubbing, heating, washing and sunlight were evaluated by using gray scale. F. benghalensis showed excellent fastness properties. Z. jujube showed series of colour variations on silk. Therefore, the bark and root of these plants can be successfully used for dyeing of silk. Natural dyes worldwide should be increased to prevent us from pollution and other harmful effects.

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Rehman, Rabia, Sara Jan Muhammad et Muhammad Arshad. « Brilliant Green and Acid Orange 74 Dyes Removal from Water by Pinus roxburghii Leaves in Naturally Benign Way : An Application of Green Chemistry ». Journal of Chemistry 2019 (11 mars 2019) : 1–10. http://dx.doi.org/10.1155/2019/3573704.

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The purpose of this study was to use low cost and easily accessible biosorbent for batch-scale elimination of brilliant green and acid orange 74 dyes from aqueous solution. Pinus roxburghii leaves were utilized to study their dye-eliminating capacities. The adsorbent was characterized by FTIR, TGA, DTA, and SEM. The optimized conditions for brilliant green and acid orange 74 dye elimination were adsorbent dose, 1.2 and 1.8 g; contact time, 30 and 45 min; pH, 2 and 1; temperature, 50°C and 60°C; and agitation speed, 125 rpm and 50 rpm for BG and AO-74, respectively. Adsorption records well fitted Langmuir isotherm. Possibility of the procedure was shown by negative values of the thermodynamic parameter ∆G° for both dyes. Kinetic studies showed that adsorption of BG and AO-74 dyes from watery solution by PR leaves followed pseudo-second-order kinetics.

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Wu, Ji Hong, et Jun Ke. « Dyeability of PLA Fabric with Natural Dye Emodin ». Advanced Materials Research 183-185 (janvier 2011) : 2000–2004. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.2000.

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The dyeability of PLA fabric with the natural emodin dye has been investigated. The effect of different factors, which are dyeing temperature, dyeing time, dye bath pH value, bath ratio, dye concentration and mordants, has been studied. The color of each dyed sample was evaluated in terms of the K/S value, and the color fastness to soaping and crocking were tested according to the ISO standards. The results showed that the dyed fabrics have a bright color and an excellent color fastness. As a result, emodin dyes PLA is a good approach to develop “green clothes” and has broad prospect.

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Pandey, Akanksha, Pooja Shukla et Pankaj Kumar Srivastava. « Remediation of Dyes in Water using Green Synthesized Nanoparticles (NPs) ». INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT 6, n^o 01 (31 janvier 2020) : 68–84. http://dx.doi.org/10.18811/ijpen.v6i01.08.

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With the rapid growth of population and increasing urbanization and industrialization, environmental pollution is becoming a serious concern worldwide. Different type of pollutants is released into the water bodies enormously from the expansive range of industries. Among all the pollutants, dyes are the major used noxious waste discharged by these productions. Even at minute content (less than 1ppm), dyes are posing a detrimental threat to the ecosystem and human health risks. Recently, nanotechnology has emerged as an efficient technology for the remediation of environmental pollutants from water. Green synthesis of nanoparticles (NPs) can be done to degrade molecules of dyes in wastewater. Various nanoparticles such as iron, palladium, and cerium dioxide using Camellia sinensis, Boswellta serrata, and Azardirachta indica extracts have been reported successfully for the remediation of various dyes like rhodamine B, methylene blue, etc. Removal of dyes from the wastewater using green synthesized nanoparticles with the help of microbes or plant extracts is a sustainable technique, i.e., by the use of this technique, our environment will not get polluted, and its quality will also be maintained. The present review discusses the classification of dyes, nanoparticle formation by using microbes and plant extract, and, finally, the remediation of dye using such nanoparticles.

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Gül, Ü. D. « A green approach for the treatment of dye and surfactant contaminated industrial wastewater ». Brazilian Journal of Biology 80, n^o 3 (septembre 2020) : 615–20. http://dx.doi.org/10.1590/1519-6984.218064.

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Abstract Synthetic dyes, particularly reactive and acid dyes, are commonly used in the textile industry because of their advantages as excellent color fastness and brightness. Also, surfactants are used for an increment of coloring success in the textile industry. One of the major problems concerning textile wastewater is the treatment of the effluents containing both dyes and surfactants. Biological treatment systems are recommended as useful, economic and eco-friendly methods for treatment of industrial wastewater. The purpose of this study was to investigate the binary removal of a textile dye and a surfactant by growing Aspergillus versicolor culture in molasses medium. The effect of dye and surfactant concentration on the removal of dye and surfactant was determined. This study resulted that 100% of the surfactant and dye molecules removed together with the formation of a dye-surfactant complex by fungus. It is concluded that binary removal systems are very efficient for industrial wastewater treatment.

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Avancini, Anita Ribas, Juliana Silva Lemões, Ester Schiavon Matoso, Nidria Dias Cruz, Sérgio Delmar Dos Anjos Silva et Cláudia Fernanda Lemons Silva. « Residual lignin from biomass pretreatment for 2G ethanol production as an adsorbent in dye removal ». Ciência e Natura 41 (14 novembre 2019) : e53. http://dx.doi.org/10.5902/2179460x39877.

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Liquid waste from some industrial activities generates a serious environmental impact due to the presence of dyes. However, during the production process of second-generation ethanol, a lignin-rich residue is generated, which may be able to absorb the dyes in the waste. The goal of this work was to test the potential of lignin as a dye-removal adsorbent. Two quantities of precipitated lignin (200 and 500 mg) were tested as adsorbents by contact with Methylene Blue, Eriochrome Black T, and Bromocresol Green dyes. Kinetics curves for the adsorption capacity (Q) of lignin quantities were constructed and the percentage of removal of each dye was calculated. The Q of the three dyes increased with contact time and was higher in the 200-mg treatment; however, the strongest dye removal was presented by the 500-mg treatment. The maximum removal achieved was 84.77% with 500 mg lignin in the methylene blue solution and the minimum was 21.32% with 200 mg in the Bromocresol green solution. Therefore, it is concluded that lignin has potential as an adsorbent, as increased quantities are more efficient in removing dyes.

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Matsumoto, Taichi, Masahiro Miki, Kazuo Kojima et Noriyuki Wada. « Optical properties of organic-dye-doped spherical particles of polyorganosiloxane derived from methyltrimethoxysilane using a reaction field of W/O emulsion ». Journal of Materials Research 23, n^o 5 (mai 2008) : 1443–51. http://dx.doi.org/10.1557/jmr.2008.0182.

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Polyorganosiloxane spherical particles were synthesized by a sol-gel method from methyltrimethoxysilane (MTMS) using a reaction field of W/O emulsion consisting of sorbitantrioleate (SPAN85), n-octane, and aqueous solutions of basic, acid, and oil-soluble organic dyes. The investigation focused on the types of dyes suitable for incorporation into the spherical particles by using this method. The morphology of the particles was observed with scanning electron microscopy (SEM). Fluorescence and ultraviolet-visible (UV-vis) reflectance spectra of dye-doped spherical particles were measured. Basic dyes [Rhodamine B (RB), Rhodamine 6G (R6G), Crystal Violet (CV), Malachite Green (MG), and Thioflavin T (TT)] were doped into the spherical particles. Spherical particles obtained from aqueous solutions of RB, R6G, and CV were colored deeply. However, the MG- and TT-doped particles were scarcely colored. The reason for this color difference was discussed based on the comparison of UV-vis reflectance spectra of dye-doped spherical particles with absorption spectra of starting solutions of the dyes. It is found that the dye that tends to form dimers in aqueous solution was doped more easily than the dyes that tend to form monomers only. On the other hand, spherical particles obtained from acid dyes [Fluorescein Sodium Salt (FSS), Orange G (OG), Naphthol Green B (NGB), and Erythrosin B (EB)] and oil-soluble dye [Fluorescein (FLU)] were all white, confirming that these dyes were not doped in the particles. The reason was discussed in terms of the nature of the dyes and the formation mechanism of the spherical particles.

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Awad, Doaa, Joanna Wilińska, Dimitra Gousia, Xiaoye Shi, Jnina Eddous, Arne Müller, Veit Wagner et al. « Toxicity and phototoxicity in human ARPE-19 retinal pigment epithelium cells of dyes commonly used in retinal surgery ». European Journal of Ophthalmology 28, n^o 4 (1 avril 2018) : 433–40. http://dx.doi.org/10.1177/1120672118766446.

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Purpose: To compare, for the first time, systematically the toxicity and phototoxicity of dyes and dye combinations used in vitreoretinal surgery. The dyes were trypan blue, brilliant blue G, trypan blue + brilliant blue G, indocyanine green, bromophenol blue, bromophenol blue + brilliant blue G, and acid violet 17, in clinically used concentrations. Methods: Human ARPE retinal pigment epithelium cells were exposed to the dyes for 30 min. For phototoxicity, the cells were exposed for 15 min to high-intensity light from a light emitting diode source with an intensity similar to surgical conditions. Toxicity was assayed either directly after exposure to either dye alone or dye and light, or with a delay of 24 h. Results: None of the dyes or their combinations was toxic when cells were exposed to them at ambient light. Acid violet led to a reduction viability by 90% already immediately after light exposure. Bromophenol blue and its combination with brilliant blue G showed strong phototoxicity (reduction of viability by 83%) when assayed with delay. Indocyanine green with different agents to adjust osmolarity (balanced salt solution, glucose, and mannitol) was not found to be toxic. Conclusion: The strong immediate phototoxicity of acid violet reflects its clinical toxicity. Bromophenol blue might also be disadvantageous for patient outcome because of its delayed phototoxicity. The other dyes (trypan blue, brilliant blue g, and indocyanine green) were not found to be toxic neither with exposure to ambient light nor after exposure to light of intensities used in surgery.

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Mohammed, Youssef M. M., et Mona E. M. Mabrouk. « Optimization of methylene blue degradation by Aspergillus terreus YESM 3 using response surface methodology ». Water Science and Technology 82, n^o 10 (5 octobre 2020) : 2007–18. http://dx.doi.org/10.2166/wst.2020.476.

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Abstract Synthetic dyes released from many industries cause pollution problems in aquatic environments affecting public health. The present study aimed to explore the potentiality of Aspergillus terreus YESM 3 (accession number LM653117) for colour removal of three different dyes: methylene blue (MB), malachite green (MG) and safranin (S). Results showed that the tolerance index of the studied fungus against tested dyes decreased in the order: methylene blue, safranin and malachite green. Removal of methylene blue colour was improved by using Box–Behnken design. Optimum condition for methylene blue biodegradation in Czapek Dox broth was achieved at pH 6, of 31.41 mg/L dye concentration and an inoculum of 5.7778 × 104 (conidia/mL) with biodegradation of 89.41%. Thus, a novel and eco-friendly system for the biodegradation of dyes using Box–Behnken design has been efficiently developed. Accordingly, A. terreus YESM 3 can be professionally used for bioremediation of methylene blue dye in wastewater and removal of environmental pollution.

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Patel, Ridham, Tushar Bhingradiya, Avinash Deshmukh et Vimal Gandhi. « Response Surface Methodology for Optimization and Modeling of Photo-Degradation of Alizarin Cyanine Green and Acid Orange 7 Dyes Using UV/TiO₂ Process ». Materials Science Forum 855 (mai 2016) : 94–104. http://dx.doi.org/10.4028/www.scientific.net/msf.855.94.

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Textile and dyes industries are generating huge amount of waste water contains significant amount of dyes which are toxic and hazardous for the environment. Recently, advanced oxidation processes (AOPs) have considerable attention because it offers an attractive method for degradation of organic compounds and color from wastewater. The present work is focused on the heterogeneous photocatalytic degradation of Alizarin Cyanine Green and Acid Orange 7 dye using UV/TiO2 process. The degradation of dyes is strongly dependent on the various operational parameters like initial concentration of dye, pH and loading of TiO2. The kinetics of degradation of dye in the solutions was found to pseudo first order kinetics. A statistical technique response surface methodology was employed to study the influence of various operational parameters on degradation efficiency. Three-factor-three-level Face Centered Design was used for design of experiments. For 100 mg/L concentration of Alizarin Cyanine Green and Acid Orange 7 dyes, the optimum parameters were found to be 1.2 gm/L and 1.4 gm/L TiO2 loading for maximum degradation of 97% and 65% respectively.

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Franchi, Daniele, Massimo Calamante, Carmen Coppola, Alessandro Mordini, Gianna Reginato, Adalgisa Sinicropi et Lorenzo Zani. « Synthesis and Characterization of New Organic Dyes Containing the Indigo Core ». Molecules 25, n^o 15 (25 juillet 2020) : 3377. http://dx.doi.org/10.3390/molecules25153377.

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A new series of symmetrical organic dyes containing an indigo central core decorated with different electron donor groups have been prepared, starting from Tyrian Purple and using the Pd-catalyzed Stille-Migita coupling process. The effect of substituents on the spectroscopic properties of the dyes has been investigated theoretically and experimentally. In general, all dyes presented intense light absorption bands, both in the blue and red regions of the visible spectrum, conferring them a bright green color in solution. Using the same approach, an asymmetrically substituted D–A-π–A green dye, bearing a triarylamine electron donor and the cyanoacrylate acceptor/anchoring group, has been synthesized for the first time and fully characterized, confirming that spectroscopic and electrochemical properties are consistent with a possible application in dye-sensitized solar cells (DSSC).

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Vyas, Jaimin, Manish Mishra et Vimal Gandhi. « Photocatalytic Degradation of Alizarin Cyanine Green G, Reactive Red 195 and Reactive Black 5 Using UV/TiO₂ Process ». Materials Science Forum 764 (juillet 2013) : 284–92. http://dx.doi.org/10.4028/www.scientific.net/msf.764.284.

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The photocatalytic degradation (PCD) of three commercially textile dyes, namely Alizarin Cyanine Green G (ACG), Reactive Red 195 (RR195) and Reactive Black 5 (RB5) has been investigated using TiO2(Degussa P25) photocatalyst in aqueous solution under UV light. Experiments were conducted to optimize various parameters viz. amount of catalyst, initial concentration of dye and solution pH. Degradation of all the dyes was examined by using UV spectrophotometer. Photocatalytic degradation increased with increasing TiO2loading (in the range 0.51.5 g/L) and decreasing with increasing dye concentration (in the range 20-100 mg/L) and solution pH (in the range 4-10). Result demonstrated that the reactivity of the three dyes for TiO2catalyzed PCD was as follows: Reactive Red 195>Reactive Black 5>Alizarin cyanine Green G, respectively.

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Rane, Niraj R., Vishal V. Chandanshive, Rahul V. Khandare, Avinash R. Gholave, Shrirang R. Yadav et Sanjay P. Govindwar. « Green remediation of textile dyes containing wastewater by Ipomoea hederifolia L. » RSC Adv. 4, n^o 69 (2014) : 36623–32. http://dx.doi.org/10.1039/c4ra06840h.

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Tayade, Priti B., et Ravindra V. Adivarekar. « Colour gamut with easy sources of natural dyes ». International Journal of Clothing Science and Technology 28, n^o 5 (5 septembre 2016) : 558–69. http://dx.doi.org/10.1108/ijcst-12-2015-0136.

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Purpose In nature, thousands of different colours and shades exist. Basic set of dyes, namely, yellow, red, blue and green are necessary for a complete colour gamut. Creating a complete gamut with natural dyes with one common extraction and application procedure is not exploited hitherto. The paper aims to discuss this issue. Design/methodology/approach In this study, an attempt was made to create a complete colour gamut with easily available natural dyes with one common extraction and application procedure. Findings Silk fabrics were dyed using various natural dyes alone and in combination to yield various shades, namely, yellow, red, green, blue. Pre-mordanting of silk fabrics was carried out with mordants, namely, alum, ferrous sulphate, copper sulphate, stannous chloride, potassium dichromate followed by dyeing. The fastness properties and colour strength values of all the shades obtained were determined. Originality/value Creating a complete gamut with natural dyes with one common extraction and application procedure is not exploited hitherto.

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Chawla, Ankita, et Baljeet Singh Saharan. « NovelCastellaniella denitrificansSA13P as a Potent Malachite Green Decolorizing Strain ». Applied and Environmental Soil Science 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/760950.

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Triphenylmethane dyes represent a major group of dyes causing serious environmental hazards. Malachite Green is one of the commonly and extensively used triphenylmethane dyes although it is carcinogenic and mutagenic in nature. Various physicochemical methods have been employed for its elimination but are highly expensive, coupled with the formation of huge amount of sludge. Hence, biological methods being ecofriendly are good alternatives. In the present study, the novel bacterial isolate SA13P was isolated from UASB tank of tannery effluent treatment plant. Phylogenetic characterization of 1470 bp fragment of SA13P has revealed its similarity withCastellaniella denitrificans. This strain has been found to decolorize the dye (malachite green) at a concentration of 100 mg L−1(80.29%). Decolorization was done by living bacterial cells rather than adsorption. Growth conditions have also been optimized for the decolorization. Maximum decolorization was observed at a temperature of 37°C and pH 8.0. Also, it has been found that bacterization of seeds ofVigna radiatawithCastellaniella denitrificansSA13P increases germination rate. We have reported for the first time thatCastellaniella denitrificansSA13P may be used as a novel strain for dye decolorization (malachite green) and biological treatment of tannery effluent.

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Vasu, A. Edwin. « Studies on the Removal of Rhodamine B and Malachite Green from Aqueous Solutions by Activated Carbon ». E-Journal of Chemistry 5, n^o 4 (2008) : 844–52. http://dx.doi.org/10.1155/2008/271615.

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Activated carbon prepared from tamarind fruit shells by direct carbonization was used for the removal of rhodamine B and malachite green dyes from aqueous solutions. Adsorption studies were performed by varying such parameters as dye concentration, pH of the dye solution, time and temperature. The equilibrium adsorption data obtained were used to calculate the Freundlich, Langmuir and Redlich-Peterson isotherm parameters. Increase in pH of the solution pH resulted in increased adsorption of both the dyes. Kinetic studies indicate that the pseudo-second order model can be used for describing the dynamics of the sorption processes. Film diffusion of the dyes was the rate determining step at low dye concentrations while diffusion of dyes through the pores the carbon particles determined the overall uptake at high concentrations. Thermodynamic parameters of the endothermic sorptions were evaluated using van’t Hoff equation. Desorption studies with acids were also performed in order to regenerate the used carbons.

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Al-Jawhari, Hala A., et Nuha A. Alhebshi. « Green Synthesized Cu2O-Cu(OH)2@Cu Nanocomposites with Fenton-like Catalytic Properties for the Degradation of Cationic and Anionic Dyes ». Crystals 12, n^o 10 (20 septembre 2022) : 1328. http://dx.doi.org/10.3390/cryst12101328.

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In this work, we introduce an environmental and sustainable approach to grow free standing heterogeneous Cu2O-Cu(OH)2 nanocomposites on a Cu mesh using spinach leaf extract and glycerol. Structural characterizations for samples annealed at 200 °C revealed that there is more Cu(OH)2 than Cu2O on the mesh surface. The photocatalytic activity of the green synthesized catalyst was studied for degradation of a cationic dye methylene blue (MB), an anionic dye methyl orange (MO) and a mixture of both dyes. The effect of changing the dye’s initial pH value on the photodegradation process was explored. After 40 min of irradiation under sunlight, with a maximum intensity of 5 mW/cm2, a basic MB dye (pH-11) showed about 80% color removal with an average kinetic rate of 94.5 m·min−1. In contrast, 93% of the acidified MO dye (pH-2) was degraded with an average kinetic rate of 126.5 m·min−1. Moreover, the versatility of the Cu2O-Cu(OH)2@Cu mesh was evaluated using a remarkable selective separability for a mixture of MB and MO at pH = 2, in the dark and under normal sunlight. Such promising outcomes indicate the potential of our green composites to degrade dyes as both photocatalysts under daylight and as Fenton-like catalysts in darkness.

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SUNARJO, Wenti Ayu, Vigory Gloriman MANALU et Wiwiek Rabiatul ADAWIYAH. « NURTURING CONSUMERS‘ GREEN PURCHASE INTENTION ON NATURAL DYES BATIK DURING CRAFT SHOPPING TOUR IN THE BATIK CITY OF PEKALONGAN INDONESIA ». GeoJournal of Tourism and Geosites 34, n^o 1 (31 mars 2021) : 186–92. http://dx.doi.org/10.30892/gtg.34124-635.

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Demand on eco-friendly products is burgeoning, as a form adaptation to climate change mitigation strategy. Hence, environmental issues are still considered as an emerging topic that concerns the tourism sector. Planned Behavior Theory (TPB) describes the formation of environmentally friendly behavior intentions in green purchase intentions of natural batik dyes. Data were obtained from 200 visitors who ever purchased natural dyed batik during their craft shopping tours to the city of Batik, Pekalongan Indonesia. The data were further analyzed using the structural equation modeling (SEM) approach. The initial model's calculation results reveal that green subjective norm has no significant relationship on green purchase intention. Furthermore, green product knowledge and attitude positively impact green purse intention of batik products made from natural ingredients. The results showed that INELOC does not moderate the relationship between attitude (ATT) on green purchase intention. Craft shopping tour is becoming popular choice of sightseeing bundling offered by travel agents. Besides its positive value, increasing demand on the handicraft shopping also has a negative consequence on the environment. The destruction occurs as a result of rapid growth in consumption, hence, purchasing environmentally friendly products can be a way to minimize the climate change and balancing the ecosystems. Demand on eco-friendly products is burgeoning, as a form adaptation to climate change mitigation strategy. Realizing that the river pollution can endanger people's health, MSMEs have started producing batik with natural dyes. Although the number of MSMEs that produce natural dyed batik products is not high, the Pekalongan City Government is continually socialize the importance of reducing chemical waste and river pollution. These findings have important implications for marketers and policymakers of natural dye batik.

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Akbar, Ishaa, Muhammad Asif Hanif, Umer Rashid, Ijaz Ahmad Bhatti, Rais Ahmad Khan et Elham Ahmed Kazerooni. « Green Nanocomposite for the Adsorption of Toxic Dyes Removal from Colored Waters ». Coatings 12, n^o 12 (13 décembre 2022) : 1955. http://dx.doi.org/10.3390/coatings12121955.

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The discharge of dyes from textile industries led to a broad range of toxicological and environmental effects, posing severe health issues for humans and animals worldwide. These dyes are highly stable and, if not adequately treated, remain in the environment for extended periods. Adsorption, the most efficient and cost-effective method, offers unique advantages for using natural adsorbents, such as marble waste composites, for dye removal. The easy availability of marble waste, its low cost, its eco-friendly nature, its ease of operation, its simplicity of design, its flexibility, and its great affinity for dyes make it a suitable option for dye removal. Golden marble waste nanocomposites are prepared for dye removal. The results from the studies suggested that treated golden marble composite materials exhibit better adsorption efficiency (224.8, 299.5, and 369.2 mg/g) for adsorptive removal of dyes than untreated golden marble composite materials (114.4 mg/g). This research also used isothermic and kinetic models to evaluate the effects of numerous parameters, for example, the initial dye concentration, pH, time, temperature, and adsorbent dose. The highest removal of 369.9 mg/g was achieved during the present study for blue dye at an optimized pH of 7 and a temperature of 30 °C. It was observed that golden marble waste composites gave better R2 (0.99) values for second-order kinetics in the kinetic model. Results obtained from comparing Langmuir, Freundlich, Temkin, Dubinin, and Herkin Jura isotherms showed that the R2 values of the Langmuir isotherm for Foron red (0.97), the Temkin isotherm for Foron blue (0.98), and the Freundlich isotherm for Foron black dye (0.97) fit on adsorption for both treated and untreated composites. Characterization techniques, such as scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), are also discussed for the structural determination of golden marble waste composites.

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Jaffer, Mehwish, Shabnum Shaheen, Hammad Ashraf et Uzma Hanif. « Green vegetation : a promising source of color dyes ». Green Processing and Synthesis 8, n^o 1 (28 janvier 2019) : 215–22. http://dx.doi.org/10.1515/gps-2018-0071.

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Abstract The present study aimed for the extraction of color dyes from different sources, such as Brassica oleracea, Brassica campestris, Citrus limon, Citrus limetta, Tagetes erecta, Spinacea oleracea, Beta vulgaris, Rosa indica and Curcuma longa. The leftovers of such plants were mainly used for color dye extraction and their confirmation using spectrophotometric analysis. The specific color pigments like carotenoids, anthocyanin, chlorophyll and betanin were found to be the main coloring agents that impart specific color to the samples. Among all these samples, the maximum yield was obtained from C. limetta aqueous peel extract, and among all the temperatures employed room temperature was found out to be the most suitable temperature for the stability of color extracts. The extracted colors were utilized in candy making and sugar syrup making and were also used for coloring various foods stuffs. Moreover, the extracted color dyes were applied for dyeing purposes on cotton cloth with alum showing better and more enhancing color fastness results than the lime.

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Amer, Wael A., Mohamed M. Omran, Ahmed F. Rehab et Mohamad M. Ayad. « Acid green crystal-based in situ synthesis of polyaniline hollow nanotubes for the adsorption of anionic and cationic dyes ». RSC Advances 8, n^o 40 (2018) : 22536–45. http://dx.doi.org/10.1039/c8ra02236d.

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Hübner, Ralph, Vanessa Benkert, Xia Cheng, Björn Wängler, Roland Krämer et Carmen Wängler. « Probing two PESIN-indocyanine-dye-conjugates : significance of the used fluorophore ». Journal of Materials Chemistry B 8, n^o 6 (2020) : 1302–9. http://dx.doi.org/10.1039/c9tb01794a.

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Rashid, Israa Muzahem, Sami Dawod Salman, Alaa Kareem Mohammed et Yasmin Salih Mahdi. « Green Synthesis of Nickle Oxide Nanoparticles for Adsorption of Dyes ». Sains Malaysiana 51, n^o 2 (28 février 2022) : 533–46. http://dx.doi.org/10.17576/jsm-2022-5102-17.

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The green synthesis of nickel oxide nanoparticles (NiO-NP) was investigated using Ni(NO3)2 as a precursor, olive tree leaves as a reducing agent, and D-sorbitol as a capping agent. The structural, optical, and morphology of the synthesized NiO-NP have been characterized using ultraviolet–visible spectroscopy (UV-Vis), X-ray crystallography (XRD) pattern, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analysis. The SEM analysis showed that the nanoparticles have a spherical shape and highly crystalline as well as highly agglomerated and appear as cluster of nanoparticles with a size range of (30 to 65 nm). The Scherrer relation has been used to estimate the crystallite size of NiO-NP which has been found about 42 nm. The NiO-NPs have subsequently used as adsorbents for adsorption of two types of dyes; methylene blue (MB) as cation dye and methyl orange (MO) as anion dye. The removal efficiency of dyes from contaminated water was investigated during various key parameters at room temperature; initial dye concentration (Co), pH, contact time (t), agitation speed, and adsorbent dosage. The maximum removal of MB dye was found to be 96% (Co=25 mg/l, pH=10, contact time=100 min, agitation speed=300 rpm and adsorbent dosage=6 g/l), while for MO the maximum removal reached 88% at (Co=20 mg/L, pH=2, contact time=160 min, agitation speed=300 rpm and adsorbent dosage=6 g/L). The experimental adsorption data were found to well obey Freundlich isotherm. The kinetic investigation showed that the adsorption process for both dyes followed a pseudo-second-order model with rate constants 0.0109 and 0.0079 (mg/g min) for MB and MO, respectively.

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Pieczykolan, Barbara, et Izabela Płonka. « Application of Excess Activated Sludge as Waste Sorbent for Dyes Removal from their Aqueous Solutions ». Ecological Chemistry and Engineering S 26, n^o 4 (1 décembre 2019) : 773–84. http://dx.doi.org/10.1515/eces-2019-0054.

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Abstract Organic dyes are widely used in many industries (textiles, food, cosmetics, medicine and biology). These plants produce wastewater containing dyes. Even small amounts of dyes can cause a strong colour of wastewater. Therefore, it is very important to effectively remove residues of these pollutants from the wastewater, before discharging them into the environment. The sorption process is one of the methods used to remove dyes. However this method is often unprofitable economically in comparison with other dye removal processes, due to the high cost of commercial sorbents. Therefore, research is currently conducted in order to find waste materials that can be used as sorbents. The static sorption process of two dyes were carried out (Acid Red 18 and Acid Green 16) with the use of dried excess sludge. The activated sludge (excess) came from a municipal sewage treatment plant that purifies wastewater from carbon, nitrogen and phosphorus compounds. During the study the most favourable pH of the process and the contact time of the sorbent with the dyes were determined. It was observed that for both dyes the highest effectiveness of dye removal was obtained at pH = 2. The most favourable contact time was equal to 60 and 180 minutes for Acid Red 18 and Acid Green 16 respectively. In addition, in order to establish process parameters, a different models of sorption isotherm was examined. The studies showed that the sorption capacity (calculated based on Langmuir model) was much higher in the case of Acid Green 16 (qm = 434.8 mg/g) than for Acid Red 18 (qm = 109.9 mg/g). The experiments to evaluate the effect of pH, contact time on the process effectiveness and to determine the sorption isotherm were conducted at 293.15 K.

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Santhi, T., S. Manonmani et S. Ravi. « Uptake of Cationic Dyes from Aqueous Solution by Biosorption onto GranularMuntingia calabura ». E-Journal of Chemistry 6, n^o 3 (2009) : 737–42. http://dx.doi.org/10.1155/2009/927406.

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A new, low cost, locally available biomaterial was tested for its ability to remove cationic dyes from aqueous solution. A granule prepared from a mixture of leafs, fruits and twigs ofMuntingia calaburahad been utilized as a sorbent for uptake of three cationic dyes, methylene blue (MB), methylene red (MR) and malachite green (MG). The effects of various experimental parameters (e.g.,contact time, dye concentration, adsorbent dose and pH) were investigated and optimal experimental conditions were ascertained. Above the value of initial pH 6, three dyes studied could be removed effectively. The isothermal data fitted the Langmuir and Freundlich isotherm models for all three dyes sorption. The biosorption processes followed the pseudo-first order rate kinetics. The results in this study indicated thatMuntingia calaburawas an attractive candidate for removing cationic dyes from the dye wastewater.

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Shahi, Dipesh, et Rajiv Sapkota. « A Comparative Study on Dye Degradation by Leaf and Root Extracts of Parthenium hysterophorus L ». International Journal of Applied Sciences and Biotechnology 6, n^o 4 (27 décembre 2018) : 327–31. http://dx.doi.org/10.3126/ijasbt.v6i4.22110.

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The use of different dyes and pigments is increasing with the increase in industrialization leading to the high production of effluent. The effluent contaminated with dyes and dye-stuff has harmful effects on public health and the environment. Thus, the treatment of effluent is essential. Biological approaches are gaining much interest due to their cost-effective and eco-friendly nature over various physicochemical methods for the treatment of dye-contaminated wastewater. This study highlights on the biodegradation of congo red and malachite green by using leaf and root extracts of Parthenium hysterophorus. The extract and the dye were mixed in the ratio of 1:2 and incubated at 40ºC for 90 minutes. Decolorization assay was performed using UV visible spectrophotometer which indicated that decolorization was due to degradation of dyes into non-colored metabolites. The leaves extract exhibited higher decolorizing activity than roots extract. The maximum decolorization for leaves extract was 55.8% (congo red) and 51.6% (malachite green). Furthermore, phytotoxicity test was carried out to determine the effect of dyes and their degradation metabolites on seed germination and seedling growth of chickpea (Cicer arietinum L). The germination percentage and seedling growth were more in degradation metabolites than untreated dyes, indicating less toxic nature of degradation metabolites. Hence, it can be inferred that P. hysterophorus extracts can be used to treat dye wastewater and treated wastewater can be used for irrigation. Int. J. Appl. Sci. Biotechnol. Vol 6(4): 327-331

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Cheng, Yu-Wen, Jean-Sebastien Benas, Fang-Cheng Liang, Shang-Ming Lin, Ting-Wang Sun, Fu-Chieh Liu, Yang-Yen Yu et Chi-Ching Kuo. « Synthesis of Azo Disperse Dyes with High Absorption for Efficient Polyethylene Terephthalate Dyeing Performances in Supercritical Carbon Dioxide ». Polymers 14, n^o 15 (26 juillet 2022) : 3020. http://dx.doi.org/10.3390/polym14153020.

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Supercritical carbon dioxide dyeing (SCDD) not only enables strong dyeing performance for a versatile range of polymer material but is also regarded as a green chemical media due to its low environmental impact as well as low risk of product denaturation. Over the decades, azo disperse dyes have been revealed to be efficient dyes and represent the wide majority of dyeing material. Azo dyes possess a wide variety of functional groups to optimize dye synthesis and tune the light absorption properties. Using SCDD, end-chain of different lengths, and functional group exhibiting various electronic affinity, six disperse red azo dyes were synthesized to investigate dyeing performances as woven fabric type, color strain, and color fastness after dyeing are discussed. Dye structure synthesized through a coupling reaction was confirmed by 1H NMR and mass spectroscopy. We found that the light absorption wavelength and absorption coefficient value variation are associated to the nature of the functional group. From the color strength values of the polyethylene terephthalate woven after dyeing, we find that the fiber host and dye dopant chemical structure greatly influence the dyeing process by providing enhanced woven, color strain, and color fastness. In comparison with commercial products, our approach not only improves the dyeing process but also guarantees a strong resistance of the dyed product against water, detergent, perspiration, abrasion, and friction.

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Swan, Ng Boon, et Muhammad Abbas Ahmad Zaini. « Adsorption of Malachite Green and Congo Red Dyes from Water : Recent Progress and Future Outlook ». Ecological Chemistry and Engineering S 26, n^o 1 (1 mars 2019) : 119–32. http://dx.doi.org/10.1515/eces-2019-0009.

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Abstract Global concern on dyes-laden effluent has intensified over the years. Dyes are toxic, stable to light, and hardly oxidized and bio-degraded, hence causing severe physiological effects to living organisms. In water, dye hinders the light penetration for photosynthetic activity, consequently oxygen is deficient for respiration by aquatic creatures. Adsorption has been widely recognized as the effective removal strategy to abate dye wastewater. However, the quests to improve the adsorption efficiency are continuously sought through new adsorbents with special characters, while performing the removal process at optimum operating conditions. This short review aims to summarize the recent progress in adsorption studies of two commonly used industrial dyes, namely malachite green and congo red by various adsorbents. From the quoted studies, the oxidized mesoporous carbon yields a higher adsorption capacity of malachite green at 1265 mg/g, while Fe3O4@nSiO2@mSiO2 displays a greater capacity for congo red removal at 1429 mg/g. A superior adsorption relies not only on specific surface area but also the synergistic interactions of pore width and mesoporosity, surface chemistry, and operating conditions. The dyes properties and factors affecting the adsorption are also highlighted and discussed, with recommendations and future outlook.

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Irawati, Wahyu, Vania Austine Callista Timotius, Ruben Patrick Adhiwijaya, Bellen Mouretta, Steven Anggawinata et Eunike Bunga Marvella. « 12 TEXTILE DYES DECOLORIZATION BY COPPER-RESISTANT-BACTERIA KLEBSIELLA GRIMONTII, SHIGELLA FLEXNERI, ENTEROBACTER CLOACAE ISOLATED FROM CISADANE RIVER TANGERANG ». BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) 9, n^o 2 (15 février 2023) : 151–62. http://dx.doi.org/10.31289/biolink.v9i2.7731.

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Dyes and copper are dangerous contaminants because they are toxic. Bioremediation using indigenous bacteria is the best solution to overcome water pollution. Copper resistant bacteria usually have resistance to dyes thereby helping the bioremediation of dye and copper wastes. This study aims to examine the ability of indigenous bacteria isolated from the Cisadane River, namely Klebsiella grimontii IrCis3, Shigella flexneri IrCis5, Enterobacter cloacae IrCis6, and Enterobacter cloacae IrCis9 in terms of resistance and ability to decolorize 12 textile dyes namely methylene blue, malachite green, congo red, mordant orange, reactive black, direct yellow, basic fuchsin, reactive orange, dispersed orange, remasol red, wantex yellow and wantex red. The results showed that Shigella flexneri IrCis5, Enterobacter cloacae IrCis6, and Enterobacter cloacae IrCis9 were resistant to all dye concentrations of 200 and 500 ppm except Klebsiella grimontii IrCis3 did not grow on malachite green and basic fuchsin at concentrations of 200 ppm and methylene blue, malachite green and basic fuchsin concentration of 500 ppm. Only Shigella flexneri IrCis5 has the ability to decolorize 200 ppm basic fuchsin up to 87.23% after 3 days of incubation. The addition of 3 mM CuSO4 reduced the ability to decolorize Shigella flexneri IrCis5 to 0.57%.

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Wang, Huayin, Ping Li et Wenlong Zhou. « Dyeing of Silk with Anthocyanins Dyes Extract from Liriope platyphylla Fruits ». Journal of Textiles 2014 (20 août 2014) : 1–9. http://dx.doi.org/10.1155/2014/587497.

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A new source of natural anthocyanins dyes, from Liriope platyphylla fruit, is proposed. This paper analyzes the dye extracts, the primary color components of the extracts, the color features of the extracts under different pH conditions, and their application in silk dyeing. The research shows that, nine anthocyanins are found in L. platyphylla fruits by analyzing the results of the HPLC/DAD, MS, and MS/MS spectra. The five major anthocyanins related to delphinidin, petunidin, and malvidin derivatives take up 91.72% of total anthocyanin contents. The color of the solution is red under acidic condition (pH < 3.0) and stays in yellow under alkaline condition with pH values above 7.0. The dye extracts applied to silk fabric with mordant free dyeing show different color under different pH conditions, changing between purple, blue, green, and yellow. However, the dyed colors is light and the dyeing rate is low. Metal mordant such as Sn in chelation enhances the dye depth and improves the fastness of the dyed silk fabrics, especially in silk fabrics dyed by premordanting and metamordanting.

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Mongkholrattanasit, Rattanaphol, Nattadon Rungruangkitkrai, Nitaya Tubtimthai, Nuttanan Sasivatchutikool et Nattaya Punrattanasin. « Natural Dye from Garcinia dulcis (Roxb.) Kurz Bark and Application on Silk Fabric by Using Pad-Batch Dyeing : A Study on Mordant Concentrations Efficiency ». Advanced Materials Research 884-885 (janvier 2014) : 216–19. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.216.

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The dyeing and fastness properties of silk fabric dyed with natural dye extraction from the bark of Garcinia Dulcis (Roxb.) Kurz by the pad-batch process was studied. The effect of dyes at different mordant concentration levels on their colour strength was also investigated. Silk fabrics dyed with Garcinia Dulcis (Roxb.) Kurz bark extract showed a pale yellow shade, while those dyed with alum and stannous chloride bright yellow and light yellow colour, respectively. Silk substrates dyed with CuSO4 gave a yellowish green colour, while those dyed with FeSO4 had a dark brown colour. The fastness properties showed fair to good rating, whereas the colour fastness to perspiration was at a poor level.

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Mongkholrattanasit, Rattanaphol, Chintana Saiwan, Charoon Klaichoi, Nattadon Rungruangkitkrai et Pornphanit Sasivatchutikool. « UV-Protection Property of Silk Fabric Dyed with Natural Indigo by Using Padding Technique : A Focus on Effect of Ferrous Sulfate Mordant ». Applied Mechanics and Materials 804 (octobre 2015) : 217–20. http://dx.doi.org/10.4028/www.scientific.net/amm.804.217.

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Silk fabric has been dyed with natural indigo (Indigofera tentoria) in absence and present ferrous sulfate mordant by using post-mordanting and pad dyeing processes. It was observed that with an increase in the dye concentration, the ultraviolet (UV) protection factor (UPF) values ranged between good and very good for the silk fabric. Silk fabrics dyed with natural indigo showed green shade. The level of fastness properties were ranged from good to very good. The results confirmed that natural dyes from natural indigo with ferrous sulfate have potential applications in fabric dyeing and in producing UV-protective silk fabrics.

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Malviya, V., P. Shrivastava, A. Yadav, R. Malviya, M. K. Dwivedi et N. Jain. « Equilibrium, Kinetic and Thermodynamic Studies of Malachite Green Dye Removal using Activated Sludge from Common Effluent Treatment Plant ». Research Journal of Chemistry and Environment 26, n^o 4 (25 mars 2022) : 124–34. http://dx.doi.org/10.25303/2604rjce124134.

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Disposal of industrial effluents containing synthetic dyes causes a potential hazard to the land and environment and therefore dyes need to be removed before disposal. In the present study, combined effluent treatment plant (CETP) sludge was activated at 200° C for 1 hour and used as an adsorbent for the removal of malachite green dye from wastewater. The adsorbent was characterized by XRF, SEM, XRD and FTIR. Batch studies were carried out under various experimental conditions by varying contact time, dye concentration, adsorption dose, pH and temperature to assess the potentiality of activated sludge for the removal of malachite green dye from wastewater. The results revealed that the removal of malachite green dye was strongly pH dependent and maximum dye removal was observed at equilibrium pH of 8.0. Optimum adsorbent dose and contact time were found to be 10 g/l and 180 minutes respectively. Thermodynamic studies showed the spontaneous and endothermic nature of the adsorption. Adsorption data have also been correlated with different isotherm models. Hence activated sludge can be used as an effective adsorbent for the removal of malachite green dye from wastewater. It could be considered as good replacement of commercially available adsorbent like zeolites, activated carbon etc. due to its significant low cost and high sorption efficiency.

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Arcon, Danielle, et Francisco Franco. « A Simple Microextraction Method for Toxic Industrial Dyes Using a Fatty-Acid Solvent Mixture ». Separations 8, n^o 9 (26 août 2021) : 135. http://dx.doi.org/10.3390/separations8090135.

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A mixture of dodecanoic and hexanoic fatty acids was used to perform a simple and efficient microextraction method for industrial dyes such as methylene blue (MB), methyl violet (MV), and malachite green (MG) in aqueous solution. The fatty-acid microextractants were simply mixed and heated until the mixture became homogeneous before adding it to the dye solutions. The fatty-acid solvent and its components were characterized with Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR) measurements, while the dye concentrations were measured using UV-Vis spectroscopy. The performance of the extracting mixture was observed to vary across different dye contaminants, dosages of the extractant, concentrations of the dyes, and contact times. High extraction efficiencies of up to ~99% were obtained for MG as well as MV, and ~73% efficiency was achieved for MB. The study shows how a mixture of fatty acids can be used as a simple, efficient, green, and sustainable low-volume method for the removal of toxic industrial dyes in aqueous solutions.

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Nie Lim, Sin, Wei Ming Ng, Jit Kang Lim et Hui Xin Che. « Performance of Mulberry Leaves Mediated Green Synthesis Zero-Valent Iron Nanoparticles in Dye Removal ». International Journal of Engineering & ; Technology 7, n^o 3.36 (6 mai 2018) : 113. http://dx.doi.org/10.14419/ijet.v7i3.36.29089.

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The nanomaterials especially be made of iron, are tapering off the environmental pollution in a sufficiently great way which is worthy for attention. Green synthesis of iron nanoparticles through the extraction of the natural products or wastes has been developed in a way that is more sustainable than the chemical routes associated with several limitations. The mulberry leaves, which are easy available in nature, were chosen for plant-mediated green synthesis of zero-valent iron nanoparticles (nZVI). The characterization of the synthesized nanoparticles was performed with the used of dynamic light scattering (DLS), scanning electron microscope (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). The polyphenols content of the mulberry leaf can be used to synthesize the iron nanoparticles. The iron nanoparticles can be used as the Fenton-like catalyst to enhance the efficiency of dyes degradation. Meanwhile, the iron nanoparticles can be removed by its magnetic properties after the degradation of pollutants which can be reused in subsequent environmental remediation. The efficiency of dyes degradation by the synthesized iron nanoparticles, was investigated by UV-visible spectroscopy (UV-vis). The cationic and anionic model dyes were used to investigate the ability of the synthesized iron nanoparticles in degradation of dye molecules. Methylene Blue was used as the model for cationic dye whereas Methyl Orange was chosen as anionic model dye. The percentage removal of respective dyes was investigated at the different period of time. The work investigated the magnetic and catalytic bi-functionalities of the synthesized iron nanoparticles.

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Harrelkas, F., M. N. Pons, O. Zahraa, A. Yaacoubi et E. K. Lakhal. « Application of a sequential batch reactor system for textile dyes degradation : comparison between azo and phthalocyanine dyes ». Water Science and Technology 55, n^o 10 (1 mai 2007) : 107–14. http://dx.doi.org/10.2166/wst.2007.313.

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Photocatalysis on supported TiO2 was combined with aerobic biological treatment in a sequential batch reactor to compare the degradation of two textile dyes: a blue azo dye (DR KBL CDG) and a green phthalocyanine dye (DR K4GN). Three reactors were run in parallel. SBR1 was used as a reference and was fed with urban wastewater only. SBR2 and SBR3 were fed with the same urban wastewater combined with pretreated (for SBR2) and non-pretreated (for SBR3) dye solution. For an azo dye concentration of 12 mg/L decolouration yields of 78 and 27% were achieved, respectively, in SBR2 and SBR3. For the phthalocyanine dye, the decolouration yields decreased to 24 and 15%, respectively. Concerning COD removal it decreases for both dyes with and without pretreatment, when the dye concentration increases. Although a detrimental effect on biomass could be observed, bacteria were able to cope with the inhibitory effect of the dyes.

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Karan, Arnab Kanti, et N. B. Manik. « Estimation of Richardson Constant for Natural Organic dye Based Cells using Orange-lemon and Apple-green ». International Journal of Innovative Research in Physics 2, n^o 4 (5 juillet 2021) : 62–67. http://dx.doi.org/10.15864/ijiip.2407.

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The Richardson constant is one of the most important parameters to analyze the current conduction process in the metal organic Schottky contact. But there are very few reports available on the estimation of effective Richardson constant for the natural dyes. In this work, we have estimated the values of effective Richardson constant for two different natural dyes namely Orange-Lemon and Apple-Green. A thin organic film of these herbal dyes was sandwiched in between Indium Tin Oxide-coated glass and a Copper plate by spin coating technique. The current-voltage-temperature response of the cells was investigated at a temperature interval of 303K to 333K using Keithley 2400 source meter. The effective Richardson constants for these dyes have been estimated which are 110 x 10-3 A/cm2K2, and 118 x 10-3 A/cm2K2 for OL and AG dye respectively, which is different from the conventional value of 120 A/cm2K2. These values will help us to study different electrical parameters for these natural dyes.

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Santhi, T., et S. Manonmani. « Uptake of Cationic Dyes from Aqueous Solution by Biosorption Using Granulized AnnonasqumosaSeed ». E-Journal of Chemistry 6, n^o 4 (2009) : 1260–66. http://dx.doi.org/10.1155/2009/472703.

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A new, low cost, locally available biomaterial was tested for its ability to remove cationic dyes from aqueous solution. A sample of granulizedAnnona squmosaseeds had been utilized as a sorbent for uptake of three cationic dyes, methylene blue (MB), methylene red (MR) and malachite green (MG). The effects of various experimental parameters (e.g., contact time, dye concentration, adsorbent dose and pH) were investigated and optimal experimental conditions were ascertained. Above the value of initial pH 5, three dyes studied could be removed effectively. The isothermal data fitted the Langmuir model in the case of MB sorption and the Freundlich model for all three dyes sorption. The biosorption processes followed the pseudo first order rate kinetics. The results in this study indicated that granulizedAnnona squmosaseed was an attractive candidate for removing cationic dyes from the dye wastewater.

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Bhandari, Netra Lal, Basant Pokhrel, Upashana Bhandari, Sulakshana Bhattarai, Anil Devkota et Ganesh Bhandari. « An overview of research on plant based natural dyes in Nepal : scope and challenges ». Journal of Agriculture and Natural Resources 3, n^o 2 (30 octobre 2020) : 45–66. http://dx.doi.org/10.3126/janr.v3i2.32328.

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The worldwide demand of natural dyes is of great interest due to the increased public awareness about the atmospheric and environmental pollution caused by the commercially available synthetic dyes. Nepal being wealthy in flora, would be fine research laboratory land for the plant based natural dyes. Among most of the natural dyes, plant-based dyes/pigments have wide range of applications in fabric, food, drug coloring, therapeutic values and also in solar cells in presence of different mordants. The use of mordant is inevitable during natural dyeing process in order to improve the fastness properties on fabrics, foods and drugs by forming a co-ordination complex with dye. In this article, a short overview of plant based natural dyes extraction applications and their scope and limitations will be discussed with special reference to Nepal. In the present review, the green methods of dye extraction, and dyeing technologies will be discussed, and the research fields based on natural dyes will be explored. Some of the natural dyes has also shown the antimicrobial, antioxidant, antifungal properties and hence are also discussed with biomedical applications.

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MAJEED, Haza Satar. « PARAMETRIC OPTIMIZATION OF DYES ABSORPTION USING POLYPROPYLENE IMINE DENDRIMER FROM TEXTILE WASTEWATER ». MINAR International Journal of Applied Sciences and Technology 04, n^o 02 (1 juin 2022) : 217–23. http://dx.doi.org/10.47832/2717-8234.11.25.

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Recently, Dendrimers are famous for monodispersed, highly branched, three dimensional, macromolecular nanoscopic architecture with several groups of the reactive end. Dendrimers work as dye removal agents from the two systems liquid-solid or liquid-liquid. This study tackles the textile dyes removal from aqueous solutions by Reactive Black 5 (RB5), Acid Blue 7 (AB7), Reactive Red 198 (RR198), Acid Green 25 (AG25), poly (propylene imine) dendrimer (PPI). and have been utilized as model dyes. Operational parameters influence the removal of dye like the concentration of dye, the concentration of dendrimer, pH, time, and temperature were investigated. Findings revealed that the efficiency of dye removal was maximized by increasing both concentrations of dye and dendrimers. Furthermore, results showed that the adsorption of dyes was supported by acidic pH through dendrimer. Besides, tests showed that maximum dyes removal were achieved at time 16h and temperature around 60 °C. As the data revealed, it can be concluded that dendrimers are adsorbent which is environmentally friendly with somehow big adsorption ability of could be an advisable substitute for dyes elimination from coloured textile wastewater.

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Nair, Amrita, Nandini Rajendhiran, R. Varsha, Biljo V. Joseph et V. L. Vasantha. « Bacterial decolourization of azo dyes ». Mapana - Journal of Sciences 16, n^o 4 (1 octobre 2017) : 1–12. http://dx.doi.org/10.12723/mjs.43.1.

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Release of textile effluent into the environment is a matter of health concern. Dyes and pigments that are part of textile effluent generate hazardous wastes which are generally inorganic or organic contaminants. Among the present pollution control strategies, biodegradation of synthetic dyes by microbes is evolving as a promising approach, even more than physico-chemical methods. While both mixed cultures and pure cultures have been used to achieve efficient biodegradation, no conclusive result has been determined. This paper aims at checking the efficiency of mixed culture of sewage and pure isolates in degradation of azo dyes, both simple dyes like methyl red and methyl orange and a more complex dye like Janus green.

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Verma, Himani, Anita Rani, Manisha Gahlot, Alka Goel et Anil Kumar Sharma. « Sustainable dyeing of wool fabric with Talaromyces purpurogenus ». Journal of Applied and Natural Science 11, n^o 4 (10 décembre 2019) : 796–801. http://dx.doi.org/10.31018/jans.v11i4.2179.

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Natural dyes had been used by human being since ancient times for colouring of various materials including textiles. These were replaced completely by synthetic dyes, continuous use of which created the problem of pollution and environmental degradation. With the development of green technology and increased awareness of sustainability, the use of non-allergic, non-toxic and eco-friendly natural dyes on textiles has become a matter of significant importance. Among the natural sources of colourants, microorganisms such as bacteria and fungi have gained interest in the field of textile coloration. In the present study, the pigment solution yielded from growth of Talaromyces purpurogenus sp. on organic waste was used for dyeing of wool fabric. Under the dyeing conditions i.e. 1:30 M:L ratio, pH 5, 80º C temperature and 45 minutes dyeing time, the percent absorption could reach 57 %, 32%, 36% and 49% respectively. The wool fabric samples dyed with the fungal dye exhibited very good to excellent washing and rubbing fastness properties. The colour pigment obtained from fungal thus offered an opportunity to reduce impact on plant resources for dye source exploration. So it can be concluded from the study that a natural fungal dye could help to sustain the environment and to minimize the over exploitation of natural resources.

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