Ye Jien, Luo Yating, Sun Jiacong, Shi Jiyan
Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Science, Zhejiang University, Hangzhou 310058, China.
Nanomaterials (Basel). 2021 Sep 30;11(10):2580. doi: 10.3390/nano11102580.
The aggregation of nanoscale zero-valent iron (nZVI) particles and their limited transport ability in environmental media hinder their application in environmental remediation. In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria ( T3) and ryegrass ( L.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.
纳米零价铁（nZVI）颗粒的聚集及其在环境介质中有限的迁移能力阻碍了它们在环境修复中的应用。在本研究中，对nZVI和膨润土改性nZVI（B-nZVI）去除Cr（VI）的效率、迁移性能及毒性进行了研究。与nZVI相比，B-nZVI使Cr（VI）的去除效率提高了10%，并且在石英砂和土壤中的迁移也显著增加。增加流速可增强nZVI和B-nZVI在石英砂柱中的迁移。两种材料在不同土壤中的迁移与黏土组成呈负相关。此外，膨润土对nZVI的改性可降低对发光菌（T3）和黑麦草（L.）的毒性。与Fe-EDTA相比，nZVI和B-nZVI的转移因子分别降低了65.0%和66.4%。这表明，尽管铁纳米颗粒在黑麦草根部积累，但它们很难转运到地上部分。本研究结果表明，B-nZVI在原位环境修复中具有很强的应用潜力。
