Reductive materials for remediation of hexavalent chromium contaminated soil - A review

Chemical reduction of Cr(VI) to Cr(III) by reductive materials is the most widely used technology for the remediation of Cr(VI)-contaminated soil due to its high efficiency, adaptability and low cost. This paper reviews chromiumchemistry and thematerials that can effectively reduce Cr(VI) to Cr(III) for the remediation of Cr(VI)contaminated soil, namely iron-bearing reductants, sulfur-based compounds and organic amendments. Moreover, we discuss the corresponding mechanisms involved in the process of immobilization of Cr(VI) in polluted soil, and emphasize the relationship between the materials remediation performance and soil environmental conditions. Besides, perspectives on the potential future researches of novel materials design and technological development in the remediation of Cr(VI) contaminated soil are also put forward. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study reviews chromium chemistry and materials for reducing Cr(VI) to Cr(III) in contaminated soil remediation, discusses mechanisms of Cr(VI) immobilization in polluted soil, emphasizes the relationship between material remediation performance and soil environmental conditions, and proposes perspectives on future research directions in novel material design and technological development for remediating Cr(VI) contaminated soil.