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| The transport behavior of nano Fe0 in different mediums under electrical field |
| Received:September 02, 2016 |
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| KeyWord:nano Fe0;transportation;electrical field;silica sand;kaoline |
| Author Name | Affiliation | E-mail | | FAN Guang-ping | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
China Construction Power and Environment Engneering Co., Ltd., Nanjing 210019, China | | | CANG Long | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CUI Xiao-dan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | dmzhou@issas.ac.cn |
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| 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 evaluated. The injection spot of nanoparticles was located about 3 cm from the anode compartment. The result showed that the transport of dispersed 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 to μ-XANES analysis, which indicated 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. |
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