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Novel chitosan–ethylene glycol hydrogel for the removal of aqueous perfluorooctanoic acid

Author:
Long, Li, Hu, Xiaolan, Yan, Jinpeng, Zeng, Yifan, Zhang, Jiaqi, Xue, Yingwen
Source:
Journal of environmental sciences (China) 2019 v.84 pp. 21-28
ISSN:
1001-0742
Subject:
adsorbents, adsorption, anions, chitosan, ethylene glycol, freeze-thaw cycles, hydrogels, hydrogen bonding, models, moieties, perfluorooctanoic acid
Abstract:
It is urgent to explore an effective removal method for perfluorooctanoic acid (PFOA) due to its recalcitrant nature. In this study, a novel chitosan-based hydrogel (CEGH) was prepared with a simple method using chitosan and ethylene glycol through a repeated freezing–thawing procedure. The adsorption of PFOA anions to CEGH agreed well to the Freundlich–Langmuir model with a maximum adsorption capacity as high as 1275.9 mg/g, which is higher than reported values of most adsorbents for PFOA. The adsorption was influenced by experimental conditions. Experimental results showed that the main removal mechanism was the ionic hydrogen bond interaction between carbonyl groups (COO−) of PFOA and protonated amine (NH+) of the CEGH adsorbent. Therefore, CEGH is a very attractive adsorbent that can be used to remove PFOA from water in the future.
Agid:
6380725