S-nZVI复合材料修复Cr(Ⅵ)和TCE复合污染地下水的效能

王戌婵; 王一鹏; 李莉莉; 袁路子; 赵庆良; 王广智; 薛瑞媛

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (2) : 841-853.

水污染与控制

S-nZVI复合材料修复Cr(Ⅵ)和TCE复合污染地下水的效能

王戌婵, 王一鹏, 李莉莉, 袁路子, 赵庆良, 王广智, 薛瑞媛

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Performance of S-nZVI composite material for remediation of Cr(VI) and TCE co-contaminated groundwater

WANG Xu-chan, WANG Yi-peng, LI Li-li, YUAN Lu-zi, ZHAO Qing-liang, WANG Guang-zhi, XUE Rui-yuan

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摘要

以羧甲基壳聚糖(CMCS)、羧甲基纤维素(CMC)为稳定剂,采用一步法合成了两种硫化纳米零价铁(S-nZVI)复合材料,通过SEM-EDS、FTIR、XPS对其表观形貌、官能团组成和表面化学性质进行了表征;通过静态吸附试验分析了两种S-nZVI对Cr(Ⅵ)和三氯乙烯(TCE)的去除性能和去除机制;同时考查了最优材料对地下水pH值和共存阴离子的抗干扰能力.结果表明:CMCS、CMC表面含有多种官能团可与S-nZVI之间形成共价键,提高S-nZVI颗粒的分散性.两种S-nZVI复合材料对Cr(Ⅵ)的吸附动力学及对TCE的降解动力学过程分别可通过准二级动力学模型和拟一级动力学模型进行拟合;Langmuir模型可以较好地模拟两种S-nZVI复合材料去除Cr(Ⅵ)的等温吸附过程,其中以CMCS作为稳定剂的S-nZVI复合材料(CMCS-S-nZVI)对Cr(Ⅵ)的最大吸附量最高,为79.46mg/g;pH值在6~9范围及NO₃^-、SO₄^2-的离子浓度对CMCS-S-nZVI去除Cr(Ⅵ)、TCE效能无显著影响.在进行工程应用时,应特别注意Cl^-可能产生的负面影响.本研究研究结果,可为高效开展可渗透反应格栅(PRB)技术修复地下水氯代烃和重金属复合污染提供理论支持.

Abstract

Using carboxymethyl chitosan (CMCS) and carboxymethyl cellulose (CMC) as stabilizers, two sulfidated nano zero-valent iron (S-nZVI) composite materials were synthesized in one-step. The apparent morphology, functional group composition, and surface chemical properties of the materials were characterized using SEM-EDS, FTIR, and XPS. Static adsorption experiments were conducted to analyze the removal performance and mechanisms of Cr(VI) and trichloroethylene (TCE) by the two S-nZVI materials. Furthermore, the resistance of the optimal material to interference from groundwater pH and coexisting anions was evaluated. The results showed that CMCS and CMC surfaces contained various functional groups that could form covalent bonds with S-nZVI, improving the dispersion of the sulfidated nano zerovalent iron particles. The adsorption kinetics of Cr(VI) and the degradation kinetics of TCE by the two S-nZVI composite materials were described by pseudo-second-order kinetic models and pseudo-first-order kinetic models, respectively. The isothermal adsorption process of Cr(Ⅵ) removal by the two S-nZVI composite materials was capable of being simulated by the Langmuir model. Moreover, the S-nZVI composite material stabilized with CMCS (CMCS-S-nZVI) presented the highest maximum adsorption capacity for Cr(Ⅵ), which was recorded as 79.46mg/g. The removal efficiency of Cr(VI) and TCE by CMCS-S-nZVI was not significantly affected by pH in the range of 6~9 or by the presence of NO₃^- and SO₄^2-. During engineering applications, the possible negative effects of Cl^- should be paid special attention to. These findings provide theoretical guidance for the effective implementation of permeable reactive barrier (PRB) technology to remediate groundwater contaminated by chlorinated hydrocarbons and heavy metals.

导出引用

王戌婵, 王一鹏, 李莉莉, 袁路子, 赵庆良, 王广智, 薛瑞媛. S-nZVI复合材料修复Cr(Ⅵ)和TCE复合污染地下水的效能[J]. 中国环境科学. 2025, 45(2): 841-853

WANG Xu-chan, WANG Yi-peng, LI Li-li, YUAN Lu-zi, ZHAO Qing-liang, WANG Guang-zhi, XUE Rui-yuan. Performance of S-nZVI composite material for remediation of Cr(VI) and TCE co-contaminated groundwater[J]. China Environmental Science. 2025, 45(2): 841-853

中图分类号： X703.5

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