Based on the phenomenon of soil polluted by Hexavalent chromium (Cr(VI)), this study systematically examined the efficiency, stability and feasibility of using sodium carboxymethyl cellulose-stabilized nanoscale ferrous sulfide (CMC-nFeS) to immobilize Cr(VI) in contaminated soil. The experiments described herein showed CMC-nFeS exhibited superior dispersity and a higher antioxidative effect than nFeS alone. Batch tests indicated the nanoparticles could effectively immobilize Cr(VI) in soil. At Cr(VI) concentrations of 56.01-502.21 mg/kg, the reducing capacity of CMC-nFeS was 54.68-198.74 mg Cr(VI)/g FeS. Following treatment with CMC-nFeS, the leachabilities of Cr(VI) and Crtotal determined by the Toxicity Characteristic Leaching Procedure (TCLP), Synthetic Precipitation Leaching Procedure (SPLP) and Physiologically Based Extraction Test (PBET) decreased significantly after 24 h and remained stable for 90 days. Column tests with water and simulated acid rain showed the injection of CMC-nFeS significantly increased the fixed Cr concentration and the procedure was environmentally friendly. Furthermore, analysis of the reaction mechanism demonstrated the best removal obtained in a neutral environment and Cr(VI) was reduced and immobilized in the form of Cr(OH)3 and Fe0.75Cr0.25OOH confirmed by SEM-EDS and XPS analysis.

中文翻译：

---

稳定化的纳米级硫化亚铁固定化六价铬在土壤中的特性和长期作用。

基于六价铬（Cr（VI））污染土壤的现象，本研究系统地研究了使用羧甲基纤维素钠稳定的纳米级硫化亚铁（CMC-nFeS）固定污染的Cr（VI）的效率，稳定性和可行性。泥。本文所述的实验表明，与单独的nFeS相比，CMC-nFeS具有更好的分散性和更高的抗氧化作用。批处理测试表明纳米粒子可以有效地固定土壤中的Cr（VI）。在Cr（VI）浓度为56.01-502.21 mg / kg时，CMC-nFeS的还原能力为54.68-198.74 mg Cr（VI）/ g FeS。用CMC-nFeS处理后，通过毒性特征浸出程序（TCLP）确定了Cr（VI）和Crtotal的浸出度，合成沉淀浸出程序（SPLP）和基于生理的提取测试（PBET）在24小时后显着下降，并在90天内保持稳定。用水和模拟酸雨进行的柱试验表明，注入CMC-nFeS显着提高了固定Cr的浓度，该过程对环境友好。此外，对反应机理的分析表明，在中性环境中获得的脱除效果最佳，并且通过SEM-EDS和XPS分析证实，Cr（VI）还原并固定为Cr（OH）3和Fe0.75Cr0.25OOH形式。