Hexavalent chromium (Cr(VI)) is a water-soluble pollutant in soil and groundwater, the mobility, bioavailability, and toxicity of which can be controlled by transforming to less mobile and more environmentally benign Cr(III) by ways of reduction. This review focused on recent advances in identifying the reaction pathways, kinetics, and products of iron-based techniques for Cr(VI) removal. It also examines new information regarding remobilization of Cr(III) in the existence of complexing ligands and manganese (Mn) of different oxidation states. A range of iron-based techniques can remove Cr(VI) from water by adsorption or reduction-coprecipitation processes. However, the success of a chromium treatment or remediation strategy requires the stability of the Cr(III)-containing solids with respect to solubilization or reoxidation in the settings they are generated. Manganese is ubiquitous in aquatic and terrestrial environments, and the redox cycling of manganese may greatly influence the fate, transport, and distribution of chromium. Coupling of redox reactions of chromium, iron, and manganese involves reaction pathways not only in the aqueous phase but also at solid-aqueous interfaces. To provide a quantitative understanding of these processes, it is essential to develop mechanistically based kinetic and transport models. Continued research should be made on iron-based treatment of Cr(VI)-contaminated water and soils and the stability of the subsequently produced Cr (III)-containing solids at environmentally relevant conditions, which will support improved predictions of chromium’s environmental fate and transport and aid in decision-making for remediation and treatment of Cr contamination.

六价铬（Cr（VI））是土壤和地下水中的水溶性污染物，其迁移率，生物利用度和毒性可以通过还原为流动性更弱，对环境更有益的Cr（III）来控制。这篇综述集中在鉴定铁基去除Cr（VI）技术的反应途径，动力学和产物方面的最新进展。它还研究了在络合配体和不同氧化态的锰（Mn）存在下有关Cr（III）迁移的新信息。多种铁基技术可以通过吸附或还原共沉淀工艺从水中去除Cr（VI）。然而，铬处理或修复策略的成功需要含Cr（III）的固体在生成环境中相对于增溶或再氧化的稳定性。锰在水生和陆地环境中无处不在，锰的氧化还原循环可能会极大地影响铬的命运，运输和分布。铬，铁和锰的氧化还原反应的耦合不仅涉及在水相中的反应途径，而且还涉及固-水界面处的反应途径。为了提供对这些过程的定量理解，必须开发基于机械的动力学和传输模型。