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Removal of clofibric acid from aqueous solution by polyethylenimine-modified chitosan beads |
Yao NIE1, Shubo DENG1,2(), Bin WANG1, Jun HUANG1,2, Gang YU1,2 |
1. POPs Research Center, School of Environment, Tsinghua University, Beijing 100084, China 2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China |
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Abstract Polyethylenimine (PEI)-modified chitosan was prepared and used to remove clofibric acid (CA) from aqueous solution. PEI was chemically grafted on the porous chitosan through a crosslinking reaction, and the effects of PEI concentration and reaction time in the preparation on the adsorption of clofibric acid were optimized. Scanning electron microscopy (SEM) showed that PEI macromolecules were uniformly grafted on the porous chitosan, and the analysis of pore size distribution indicated that more mesopores were formed due to the crosslinking of PEI molecules in the macropores of chitosan. The PEI-modified chitosan had fast adsorption for CA within the initial 5 h, while this adsorbent exhibited an adsorption capacity of 349 mg·g−1 for CA at pH 5.0 according to the Langmuir fitting, higher than 213 mg·g−1 on the porous chitosan. The CA adsorption on the PEI-modified chitosan was pH-dependent, and the maximum adsorption was achieved at pH 4.0. Based on the surface charge analysis and comparison of different pharmaceuticals adsorption, electrostatic interaction dominated the sorption of CA on the PEI-modified chitosan. The PEI-modified chitosan has a potential application for the removal of some anionic micropollutants from water or wastewater.
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Keywords
clofibric acid
PEI-modified chitosan
adsorption capacity
adsorption mechanism
electrostatic interaction
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Corresponding Author(s):
Shubo DENG
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Issue Date: 20 June 2014
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