农业环境科学学报2016，Vol.35Issue(12)：2320-2326,7.DOI:10.11654/jaes.2016-1133
电场驱动纳米Fe0在不同介质中的迁移行为研究
The transport behavior of nano Fe0 in different mediums under electrical field
摘要
Abstract
Nano zero-valent iron(nano Fe0)has attracted increasing attention for the remediation of contaminated groundwater and soil due to its high surface area and chemical reactivity. However, the transport of nano Fe0 is usually limited or halted by its aggregation and settling in the soil pores. Coupling with electrokinetics(EK)would enhance the delivery of nano Fe0, especially in the low-permeability subsurface. In this study, four different mediums(100%silica sand, 75%silica sand/25%kaoline, 50%silica sand/50% kaoline and 100%kaoline) were selected as typical mediums, and the effect of EK on the transportation behavior of dispersed nano Fe0 in different mediums was evalu-ated. The injection spot of nanoparticles was located about 3 cm from the anode compartment. The result showed that the transport of dis-persed nano Fe0 is more obvious in 100%sand than that in the other mediums with EK, which was related to the higher electroosmotic flow due to the higher porosity. Most of the nano Fe0 was retained in the location near the injection spot and gradually dissolved into Fe2+and Fe3+in S3 and S4 section. The transportation of nano Fe0 in 100%kaoline was higher than the other mixed mediums, which was attributed to its higher electrical current. Nano Fe0 migrated in kaoline is existed as lepidocrocite and magnetite according toμ-XANES analysis, which in-dicated that the dissolution and transformation of nano Fe0 was easy to occur during EK delivery process and its migration in kaoline was carried out in ionic state.关键词
纳米Fe0/迁移/电场/石英砂/高岭土Key words
nano Fe0/transportation/electrical field/silica sand/kaoline分类
资源环境引用本文复制引用
樊广萍,仓龙,王玉军,崔晓丹,周东美..电场驱动纳米Fe0在不同介质中的迁移行为研究[J].农业环境科学学报,2016,35(12):2320-2326,7.基金项目
国家自然科学基金项目 （）
