Advances in metal(loid) oxyanion removal by zerovalent iron: Kinetics, pathways, and mechanisms
Advances in metal(loid) oxyanion removal by zerovalent iron: Kinetics, pathways, and mechanisms
复制标题
零价铁去除金属（类）氧阴离子的进展：动力学、途径和机制
DOI：
10.1016/j.chemosphere.2021.130766
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Paul G. Tratnyek
中科院分区：
文献类型：
--
作者：
Xiao Wang;Yue Zhang;Zhiwei Wang;Chunhua Xu;Paul G. Tratnyek
地下水、地表水和废水中的金属(类)氧离子因其高毒性、流动性和不易降解而对人类或生态健康产生有害影响。近年来，利用零价铁(ZVI)去除金属(类)氧阴离子已成为许多研究的主题，但这方面的文献还没有得到系统的综述。在环境条件下形成金属(Loid)氧阴离子的主要元素有：Cr(VI)、As(V和III)、Sb(V和III)、Tc(VII)、Re(VII)、Mo(VI)、V(V)等。ZVI去除金属(Loid)阴离子的机理可能涉及氧化还原反应、吸附、沉淀和共沉淀，其中一个机理是主要反应途径，另一个起辅助作用。然而，去除机理与Fe(0)的腐蚀反应和反应条件有关。在腐蚀过程中，ZVI表面形成的氢氧化铁层起到了隔离金属(类)氧离子的作用。本综述总结了目前研究最广泛的金属(类)氧阴离子污染物(铬、砷、锑)的去除机理和性能(如动力学)的大部分现有数据，这些污染物由通常用于废水处理的不同类型的ZVI以及已硫化或与催化双金属结合的ZVI去除。
Metal(loid) oxyanions in groundwater, surface water, and wastewater can have harmful effects on human or ecological health due to their high toxicity, mobility, and lack of degradation. In recent years, the removal of metal(loid) oxyanions using zerovalent iron (ZVI) has been the subject of many studies, but the full scope of this literature has not been systematically reviewed. The main elements that form metal(loid) oxyanions under environmental conditions are Cr(VI), As(V and III), Sb(V and III), Tc(VII), Re(VII), Mo(VI), V(V), etc. The removal mechanisms of metal(loid) oxyanions by ZVI may involve redox reactions, adsorption, precipitation, and coprecipitation, usually with one of these mechanisms being the main reaction pathway and the other playing auxiliary roles. However, the removal mechanisms are coupled to the reactions involved in corrosion of Fe(0) and reaction conditions. The layer of iron oxyhydroxides that forms on ZVI during corrosion mediates the sequestration of metal(loid) oxyanions. This review summarizes most of the currently available data on mechanisms and performance (e.g., kinetics) of removal of the most widely studies metal(loid) oxyanion contaminants (Cr, As, Sb) by different types of ZVI typically used in wastewater treatment, as well as ZVI that has been sulfidated or combination with catalytic bimetals.