Selective Adsorption and Separation of Organic Dyes with Spherical Polyelectrolyte Brushes and Compressed CO2
Direct discharge of industry organic dyes has caused serious environmental pollution. Herein, we proposed a rational designed spherical polyelectrolyte brushes (SPB) with cationic charges, polystyrene‐poly(2‐aminoethylmethacrylate hydrochloride) (PS‐PAEMH), as the absorbent and compressed carbon dioxide as the anti‐solvent to separate the anionic dye, eosin Y (EY) from a solution of mixed dyes. The adsorption behavior of EY onto PS‐PAEMH was highly dependent on CO2 pressure, contact time and initial concentration, and the maximum adsorption capacity of PS‐PAEMH was 335.20 mg/g. FTIR and UV‐vis measurements proved that the electrostatic interaction played an important role in the absorbance process. The adsorption process fitted the pseudo‐second‐order kinetic model and Freundlich isotherm model very well. Due to the Donnan effect of polymer brush, the dye and the polymer brush could be easily separated by adding NaCl aqueous solution through ion exchange to regenerate the polymer brush. The recovered PS‐PAEMH still kept high adsorption capacity even after five times of regeneration. It provides a simple and effective way to separate ionic materials for environmental engineering.
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