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Selective Adsorption and Separation of Organic Dyes with Spherical Polyelectrolyte Brushes and Compressed Carbon Dioxide
Author(s) -
Zhang Rui,
Yu Zhenchuan,
Wang Lei,
Shen Qizhe,
Hou Xiaoyan,
Guo Xuhong,
Wang Junwei,
Zhu Xuedong,
Yao Yuan
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201701700
Subject(s) - adsorption , polyelectrolyte , polystyrene , aqueous solution , freundlich equation , chemical engineering , chemistry , polymer , cationic polymerization , materials science , polymer chemistry , organic chemistry , engineering
Dye‐containing wastewater has caused serious environmental pollution. Herein, rationally designed spherical polyelectrolyte brushes (SPBs) with cationic charges, polystyrene–poly(2‐aminoethylmethacrylate hydrochloride) (PS‐PAEMH) as the absorbent, and compressed carbon dioxide as the antisolvent are proposed for the separation of the anionic dye eosin Y (EY) from a solution of mixed dyes. The adsorption behavior of EY onto PS‐PAEMH was highly dependent on CO 2 pressure, contact time, and initial concentration. The maximum adsorption capacity of PS‐PAEMH was 335.20 mg g −1 . FTIR and UV/Vis measurements proved that the electrostatic interactions between EY and PS‐PAEMH played an important role in the absorbance process. The adsorption process fitted the pseudo‐second‐order kinetic model and Freundlich isotherm model very well. The combined dye and polymer brush could be easily separated through ion exchange by adding an aqueous solution of NaCl. Recovered PS‐PAEMH retained a high adsorption capacity even after ten cycles of regeneration. This method provides a simple and effective way to separate ionic materials for environmental engineering.