CS/PPy/PEI气凝胶中Cr(VI)的吸附-还原-固化-再吸附循环富集研究

邢建宇; 白玥皓; 马欢; 刘娅莉; 贾睿

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (9) : 4904-4913.

水污染与控制

CS/PPy/PEI气凝胶中Cr(VI)的吸附-还原-固化-再吸附循环富集研究

邢建宇^1,2, 白玥皓¹, 马欢⁴, 刘娅莉⁴, 贾睿^1,3

作者信息 +

Adsorption-reduction-immobilization-readsorption cyclic enrichment of Cr (VI) in CS/PPy/PEI aerogels

XING Jian-yu^1,2, BAI Yue-hao¹, MA Huan⁴, LIU Ya-li⁴, JIA Rui^1,3

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摘要

Cr(VI)通常以阴离子存在带负电荷,而Cr(III)以阳离子存在带正电荷,通过还原Cr(VI)得到带正电荷的Cr(III)可以进一步吸附Cr(VI),从而以铬酸铬的方式实现循环吸附富集.本研究将聚吡咯(PPy)分散在壳聚糖/聚乙烯亚胺(CS/PEI)凝胶网络中制备出CS/PPy/PEI复合气凝胶,通过SEM、FT-IR、Zeta电位和UV-vis-NIR光谱分析了CS/PPy/PEI的组成和结构.基于Cr(VI)/Cr(III)的价态转变,在CS/PPy/PEI气凝胶中建立了Cr(VI)吸附-光还原-固定化-再吸附的循环富集过程.结果表明,抗坏血酸作为光催化还原过程中的助催化剂引入,可进一步增强CS/PPy/PEI对铬的富集作用,循环富集6次后,CS/PPy/PEI的吸附量可达279.69mg/g.由于CS/PPy/PEI气凝胶不含任何其他金属,因此可以通过简单的煅烧有效回收高纯度铬.

Abstract

Cr (VI) typically exists as a negatively charged anion, whereas Cr (III) is positively charged as a cation. The positively charged Cr (III) obtained through the reduction of Cr (VI) can further adsorb Cr (VI), thereby enabling cyclic adsorption and enrichment of chromium species. In this study, polypyrrole (PPy) was dispersed in chitosan/polyethyleneimine (CS/PEI) hydrogel network to prepare a composite aerogel named CS/PPy/PEI. The composition and structure of CS/PPy/PEI were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Zeta potential and UV-vis-NIR spectroscopy. Based on the valence transformation of Cr (VI) /Cr (III), the cyclic enrichment process of Cr (VI) adsorption-photoreduction- immobilization-re-adsorption is established in CS/PPy/PEI aerogel. The results showed that the introduction of ascorbic acid as a co-catalyst during the photocatalytic reduction process could further enhance the enrichment of chromium by CS/PPy/PEI, and the adsorption capacity of CS/PPy/PEI could reach 279.69mg/g after 6cycles of enrichment. Since CS/PPy/PEI aerogels do not contain any other metals, high-purity chromium can be effectively recovered through simple calcination.

导出引用

邢建宇, 白玥皓, 马欢, 刘娅莉, 贾睿. CS/PPy/PEI气凝胶中Cr(VI)的吸附-还原-固化-再吸附循环富集研究[J]. 中国环境科学. 2025, 45(9): 4904-4913

XING Jian-yu, BAI Yue-hao, MA Huan, LIU Ya-li, JIA Rui. Adsorption-reduction-immobilization-readsorption cyclic enrichment of Cr (VI) in CS/PPy/PEI aerogels[J]. China Environmental Science. 2025, 45(9): 4904-4913

中图分类号： X703.1

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