Toxic dyes are one of the most alarming pollutants which affect potability of water. Mitigation of pollution caused by organic dyes through adsorption process has attracted attention of researchers globally. Majority of existing adsorbents are synthetic and composed of hazardous chemicals, often resulting in secondary pollution. The wastewater treatment for removing textile effluents includes dye degradation, owing to which dyes cannot be reused. Hence, there is a need for environment-friendly adsorption matrices that can recycle and reduce dye-containing effluents. Present work reports plausible usage of a self-assembled, stimuli-responsive, novel tri-composite hydrogel of chitosan, gellan, and κ-carrageenan to address dye recovery and reusability. This hydrogel membrane showed pH-responsive adsorption of cationic dye, methyl green (MG), and anionic dye, methyl orange (MO), with similar adsorption equilibrium, i.e., 315 mg g-1 and 276 mg g-1, respectively. Moreover, selective adsorption at different pH allows separation of dye mixture, imperative for dye recovery. This hydrogel membrane was reusable for at least ten cycles exhibiting desorption efficiency of 80% for anionic and 50% for cationic dye that can be recycled, making the process environmentally sustainable.

pH-Responsive Adsorption and Separation of Organic Dyes Using Self-Assembled Polysaccharide Composite Hydrogel for Wastewater Treatment

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