Macro-Reticular Ion Exchange Resins for Recovery of Direct Dyes from Spent Dyeing and Soaping Liquors (original) (raw)
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Adsorption Decolorization Technique of Textile/Leather – Dye Containing Effluents
International Journal of Waste Resources, 2016
The purpose of this study was to evaluate the potential of ion exchange resins to remove the color from industrial wastewaters. In textile-leather dyeing, paper, colour, printing, cosmetics, pharmaceutical and other industries the synthetic dyes are extensively used. Adsorption techniques are much used to remove certain classes of pollutants from waters, especially from industrial colored wastewaters. In recent years, functional polymers have been increasingly tested as a potentially alternative to traditional adsorbents due to their vast surface area, perfect mechanical rigidity, adjustable surface chemistry and feasible regeneration under mild conditions. The strongly basic anion exchanger resins were used as an adsorbent for the acid, direct and reactive dyes adsorption from the coloured wastewaters.
Anion exchange resins for removal of reactive dyes from textile wastewaters
Water Research, 2002
Sorption onto an easily regenerable sorbent in fixed bed filters would be an interesting option for removal of reactive dyes from textile wastewaters. A previous screening with model solutions (Dyes Pigm 51 (2001) 111) had shown two anion exchangers (strong basic S6328a and weak basic MP62, both Bayer) to exhibit good sorption characteristics for reactive dyes. The aim of this study was to evaluate these materials more closely. Thus filter breakthrough, the behavior with original wastewater samples, and the effect of inorganic wastewater parameters as well as regeneration were studied. Breakthrough curves for both materials are relatively unfavorable with a flat gradient, but throughput until breakthrough (100-800 bed volumes) should be sufficient for technical use. With both resins dye uptake is influenced little by competition of inorganic anions (sulfate, carbonate, phosphate) and they perform well in original wastewaters. However, the weak basic type is only efficient up to pH 8. Alkaline regeneration works well for MP62, for S6328a acid regeneration works for most dyes. r
Journal of Water Process Engineering, 2023
The textile industry is one of the most important industries in the world, but it is also one of the largest wastewater generators responsible for water depletion and ecotoxicity due to the inefficient fixation of textile dyes in fabrics. Although various studies have focused on the physicochemical and biological treatments of wastewater, these processes can be expensive and/or not environmentally sustainable, mainly focusing on the degradation of dyes rather than their valorisation. Aiming at the circularity of textile industries, Aqueous Biphasic Systems (ABS) have been proposed as circular, cost-effective, and sustainable platforms for the recovery of textile dyes. Thus, an overview of the use of ABS in the extraction and concentration of textile dyes is provided in this study, along with the main aspects of the textile dyeing process, the types of dyes used, their fixation efficiency, textile effluent composition, and commonly studied treatment methods. Overall, this study allows us to understand the influence of dye characteristics and ABS phase-forming compounds on the recovery efficiency of dyes, demonstrating the advantages of using this type of system in the design of a circular and sustainable extraction platform for the recovery and concentration of these compounds, as well as identifying the necessary improvements to successfully implement ABS-based processes at an industrial scale.
Removal of Dyes from Textile Industry Effluent: A Review
— Effluent from the textile industry contains toxic compounds. These compounds contaminate the surface water, thereby making it unfit for irrigation and drinking. Since farmers use water from the rivers for agricultural purposes and the residents of the town, use both the surface and underground water from the same area as potable water, it is quite unsafe to discharge this effluent into water body. Suspended solids can clog fish gills, either kill them or reduce their growth rate. They also reduce the ability of algae to produce food and oxygen. Therefore, proper treatment of effluent water and enforcement of pollution control by the regulatory authority on the indiscriminate discharge of textile wastewater into water bodies should be done. Batch adsorption experiments using Ashoka leaf powder, a low cost, locally available biomaterial as an adsorbent has been used for removal of cationic dyes such as Methylene blue, Malachite Green, Rhodamine B and Brilliant Green from effluent of textile industry.
Chemical Engineering Journal, 2009
Poly(glycidylmethacrylate) was grafted via surface-initiated-atom transfer radical polymerization (SI-ATRP) on a cross-linked acrylate based resin. Epoxy groups of the grafted polymer, were modified into strong cation-exchange groups (i.e., sulfonic groups) in the presence of sodium sulfite. The adsorption of Crystal Violet and Basic Fuchsine on the strong cation-exchange resin was studied under different experimental conditions. The adsorption process for both basic dyes was pH dependent. The maximum adsorption was observed for both dyes between pH 2.0 and 7.0. The maximum adsorption capacity of the cation-exchange resin for CV and BF dyes were found to be 76.8 and 127.0 mg/g, respectively. Adsorption of the dyes on the resin fitted to Langmuir and Temkin isotherm models and followed the pseudosecond-order kinetics. The values of Gibbs free energy of adsorption ( G • ) were found to be −2.92 and −6.31 kJ/mol at 308 K for CV and BF dyes, respectively. These negative values indicated the spontaneity of the adsorption of the dyes on the resin. Desorption of both dyes was achieved from the resin by using 0.1 M HNO 3 and desorption ratio up to 97% was obtained over seven adsorption/desorption cycles.
Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies
ACS Omega
Here, we propose a low-cost, sustainable, and viable adsorbent (pine tree-derived biochar) to remove acid dyes such as acid violet 17 (AV), which is used in the silk dyeing industry. As a case study, the AV removal process was demonstrated using synthetic effluent and further as a proof of concept using real dye effluent produced from the Sirumugai textile unit in India. The pine tree-derived biochar was selected for removal of aqueous AV dye in batch and fixed-bed column studies. The adsorbent material was characterized for crystallinity (XRD), surface area (BET), surface morphology and elemental compositions (SEM−EDX), thermal stability (TGA), weight loss (DGA), and functional groups (FTIR). Batch sorption studies were performed to evaluate (i) adsorption at various pH values (at pH 2 to 7), (ii) isotherms (at 10, 25, and 35°C) to assess the temperature effect on the sorption efficiency, and (iii) kinetics to reveal the effect of time, adsorbent dose, and initial concentration on the reaction rate. After systematic evaluation, 2 g/L biochar, 25 mg/L AV, pH 3, 40°C, and 40 and 360 min in a completely mixed batch study resulted in 50 and 90% dye removal, respectively. The isoelectric point at pH 3.7 ± 0.2 results in maximum dye removal, therefore suggesting that monitoring the ratio of different effluent (acid/wash/dye) can improve the colorant removal efficiency. The Langmuir isotherm best fits with the sorption of AV to biochar, provided a maximal dye uptake of 29 mg/g at 40°C, showing that adsorption was endothermic. Fixed-bed studies were conducted at room temperature with an initial dye concentration of 25 and 50 mg/L. The glass columns were packed with biochar (bed depth 20 cm, pore volume = 14 mL) at an initial pH of 5.0 and a 10 mL/min flow rate for 120 min. Finally, the regeneration of the adsorbent was achieved using desorption studies conducted under the proposed experimental conditions resulted in 90−93% removal of AV even after five cycles of regeneration.
Caspian Journal of Environmental Sciences, 2021
Environmental pollution is one of the most important and main problems that the world is facing today. Global production and use of chemical compounds, many of which are resistant to biodegradation, have increased significantly in recent decades. These compounds enter the environment after consumption, and therefore, it is necessary to provide solutions to reduce consumption and remove pollutants from the environment. Removing the textile dyes of crystal violet (CV) and methylene blue (MB) from aqueous solution by CNT/TiO2 surface was studied. We considered several physio-chemical parameters for example, contact time, primary concentration dye (5-50 mg L-1), adsorbent amount (0.01-0.1 gm), as well as temperature (15, 35, and 50 °C) in technique batchadsorption. The output appeared absorbing two favorable dyes MB, CV at the basic pH. Moreover, removal present elevated by the increased amount of adsorbent, while decreased by uprising the primary concentration of dye, and agitation time bath of the two dyes. The adsorption capacity (Qe) upraised by the increased contact time and initial concentration of dyes, and then declined by the adsorbent weight and the procedure of temperature. The equilibrium data were estimated utilizing Freundlich and Langmuir isotherms. The Freundlich isotherm describes the best uptake of MB and CV dyes. The adsorption of CV and MB in the present study on the CNT/TiO2 was heterogeneous with multi-layers. The results have shown immense potential, and it was found that the correlation coefficient value deals with the dyes, while the Langmuir equation did not exhibit good correlation of dyes.
A Review of Various Treatment Methods for the Removal of Dyes from Textile Effluent
Recent Progress in Materials
Wastewater generated by the textile industry has been a major environmental concern for a long. Production of fiber involves various steps and uses a lot of chemicals, dyes, and water. Therefore, the effluent produced from the textile industry needs proper purification before discharging into the water body. The current review summarizes various physical and chemical methods like ion exchange, coagulation-flocculation, membrane separation, membrane distillation, oxidation, ozonation, etc., for wastewater treatment. Along with this, adsorption methods, the various adsorbents used to purify wastewater, and the mechanism involved in adsorption have also been discussed. The biological method utilizes various microbes (bacteria, fungi, algae, and yeast) as a whole and the enzymes (laccase and azoreductase) secreted by them for wastewater treatment, which have been considered more feasible than physical and chemical methods. The adsorption and biological methods are better than other tech...