| Novel chitosan–ethylene glycol hydrogel for the removal of aqueous perfluorooctanoic acid |
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| 基金项目： | This work was partially supported by the Wuhan Water Engineering & Technology Co.Ltd.The authors also thank the anonymous reviewers for their invaluable insight and helpful suggestions |
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| 摘 要： | 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.
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| 收稿时间： | 2019/2/1 0:00:00 |
Novel chitosan-ethylene glycol hydrogel for the removal of aqueous perfluorooctanoic acid |
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| Authors: | Li Long Xiaolan Hu Jinpeng Yan Yifan Zeng Jiaqi Zhang Yingwen Xue |
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| 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 freezingthawing procedure.The adsorption of PFOA anions to CEGH agreed well to the FreundlichLangmuir 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. |
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| Keywords: | PFOA removal Chitosan-based material Hydrogel Adsorption mechanism |
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