Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, PR China.
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China.
Sci Total Environ. 2021 Jun 15;773:145654. doi: 10.1016/j.scitotenv.2021.145654. Epub 2021 Feb 5.
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 chromium chemistry and the materials 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.
化学还原法是将六价铬（Cr(VI)）还原为三价铬（Cr(III)），该方法因高效、适应性强、成本低，而成为修复 Cr(VI)污染土壤最常用的技术。本文综述了可有效将 Cr(VI)还原为 Cr(III)的铬化学和材料，包括含铁还原剂、含硫化合物和有机改良剂。此外，还讨论了 Cr(VI)在污染土壤中固定化过程涉及的相应机制，并强调了材料修复性能与土壤环境条件之间的关系。最后，还对新型材料设计和技术开发在修复 Cr(VI)污染土壤方面的潜在未来研究方向提出了展望。
