A review of the removal of heavy metal ions in wastewater by modified montmorillonite

IF 1.5 4区环境科学与生态学 Q4 WATER RESOURCES

Water Policy Pub Date : 2022-08-18 DOI:10.2166/wp.2022.033

Yan Shi, Songtao Zhong, Xin Wang, C. Feng

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引用次数: 4

Abstract

Heavy metal pollution in water environment has always been a hot issue in environmental pollution research. Among various removal methods of heavy metal pollution, adsorption has attracted attention because of its low cost and low secondary pollution. Montmorillonite is one of an ideal adsorption materials because of its natural pore structure and a high specific surface area. In this review, the modification methods of montmorillonite are introduced. The adsorption effect of different heavy metal ions and the main factors affecting the adsorption are discussed in detail. Meanwhile, the adsorption mechanism is intensively reviewed. The removal of Cr(VI), Cd(II), Pb(II), Cu(II), Cs(I), Co(II), Hg(II), Zn(II), Ni(II), and other nine heavy metal ions by modified montmorillonite was summarized and discussed, and the optimal pH values for different adsorbents were also different, but they were all less than 7, and the removal rates of heavy metal ions by modified montmorillonite under optimal conditions were all greater than 90%. It is concluded that the composite montmorillonite material has a great adsorption potential. Finally, it is proposed that the combination of advanced oxidation and composite montmorillonite material adsorption to remove heavy metal ions is an important direction of adsorption and removal of heavy metal ions in the water environment in the future.

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改性蒙脱土去除废水中重金属离子的研究进展

水环境中的重金属污染一直是环境污染研究的热点问题。在各种去除重金属污染的方法中，吸附法以其低成本和低二次污染而备受关注。蒙脱石具有天然的孔结构和高比表面积，是一种理想的吸附材料。本文介绍了蒙脱石的改性方法。详细讨论了不同重金属离子的吸附效果及影响吸附的主要因素。同时，对吸附机理进行了深入的综述。总结和讨论了改性蒙脱土对Cr（VI）、Cd（II）、Pb（II），Cu（II）和Cs（I），Co（II）以及Hg（II）与Zn（II）及Ni（II）等9种重金属离子的去除效果，不同吸附剂的最佳pH值也不同，但均小于7，在最佳条件下，改性蒙脱土对重金属离子的去除率均大于90%。结果表明，复合蒙脱土材料具有较大的吸附潜力。最后，提出将高级氧化与复合蒙脱石材料吸附相结合去除重金属离子是未来水环境中重金属离子吸附去除的重要方向。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Policy 环境科学-水资源

CiteScore

3.10

自引率

12.50%

发文量

审稿时长

6-12 weeks

期刊介绍： Water Policy will publish reviews, research papers and progress reports in, among others, the following areas: financial, diplomatic, organizational, legal, administrative and research; organized by country, region or river basin. Water Policy also publishes reviews of books and grey literature.