Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, China.
J Environ Sci Health B. 2022;57(5):430-440. doi: 10.1080/03601234.2022.2071561. Epub 2022 May 15.
Cadmium (Cd) contamination in soils is of great concern, and therefore the development of effective remediation technologies for cadmium contamination is urgent. In our study, nano zero-valent iron (NZVI) supported by metal-organic framework (MOF) materials (MOF-NZVI) were prepared using NaBH and FeCl to try to solve the soil Cd remediation problem. Herein, the effects and the mechanism of MOF-NZVI for the immobilization of Cd in contaminated soil was investigated. The results showed that MOF-NZVI was capable of converting Cd in soil from weak acid extractable and reducible fractions to oxidizable and residual states, thus effectively reducing the toxicity of Cd in soil. FTIR and XRD analysis confirmed that the dominant reaction mechanism between MOF-NVZI and Cd is adsorption with complexation, and the stabilization of Cd is achieved by the formation of compounds such as FeOCdOH.
土壤中的镉（Cd）污染受到极大关注，因此，开发有效的镉污染修复技术迫在眉睫。在本研究中，我们使用硼氢化钠和氯化铁制备了负载在金属-有机骨架（MOF）材料上的纳米零价铁（NZVI）（MOF-NZVI），试图解决土壤镉修复问题。本文研究了 MOF-NZVI 对污染土壤中镉固定的效果和机制。结果表明，MOF-NZVI 能够将土壤中的 Cd 从弱酸可提取和可还原态转化为可氧化和残留态，从而有效降低土壤中 Cd 的毒性。FTIR 和 XRD 分析证实，MOF-NVZI 与 Cd 之间的主要反应机制是吸附和配位，通过形成 FeOCdOH 等化合物实现 Cd 的稳定。
