Abstract Chromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

中文翻译：

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纳米零价铁在六价铬污染土壤中的应用综述

摘要 铬（Cr）是一种常见的有毒重金属，广泛应用于各行各业，造成了一系列环境问题。纳米零价铁（nZVI）被认为是污染土壤，特别是重金属污染物的理想修复材料。近年来，nZVI作为一种低毒、活性好的材料，在土壤六价铬（Cr(vi)）的原位修复中得到了广泛的应用。本文总结了目前制备nZVI的一些技术，并提出了Cr(vi)污染土壤的修复机理。介绍了五种分类的改性nZVI材料，并总结了它们在Cr(vi)污染土壤中的修复过程。研究了影响 nZVI 修复 Cr(vi) 污染土壤的关键因素。探索了基于 nZVI 的材料与 Cr(vi) 之间的相互作用机制。本研究对用于修复Cr(vi)污染土壤的nZVI材料进行了全面综述，有利于减少土壤污染。