Stabilization of Fe0 nanoparticles with silica fume for enhanced transport andremediation of hexavalent chromium in water and soil |
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Authors: | Yongchao Li Tielong Li Zhaohui Jin |
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Affiliation: | 1. College of Environmental Science and Engineering, Nankai University, Tianfin 300071, China. E-mail: liyongchao@mail.nankai.edu.cn 2. College of Environmental Science and Engineering, Nankai University, Tianfin 300071, China. E-mail: liyongchao@mail.nankai.edu.cn ;Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education of China |
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Abstract: | Effective in situ remediation of Cr(VI) in groundwater requires the successful delivery of reactive iron particles to the subsurface. Fe(0) nanoparticles (20-110 nm diameter) supported on silica fume were synthesized by borohydride reduction of an aqueous iron salt in the presence of a support material. The experimental result showed that attachment of Fe(0) nanoparticles on the commercial available sub-micrometer silica fume prevented them from aggregation while maintaining the particle reactivity. When the Fe(0) concentration was 0.4 g/L, 88.00% of 40 mg/L Cr(VI) was removed by silica fume-supported Fe(0) nanoparticles (SF-Fe(0) in 120 min, 22.55% higher than unsupported Fe(0). Furthermore, transport experiments confirmed that almost all unsupported Fe(0) was retained, whereas 51.50% and 38.29% of SF-Fe(0) were eluted from the vertical and horizontal sand column, respectively. Additionally, the effect of solution ionic strength on the transport ability of SF-Fe(0) was evaluated. The result showed that increase in the salt concentration led to a decrease in the mobility and also the divalent ion Ca2+ had a greater effect than that of monovalent ion Na+. |
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Keywords: | silica fume Fe0 nanoparticles stability Cr(VI) removal transport |
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