Column Experiment on Cr (VI) Reduction with SiO2-Coated Fe Nanocomposites

Yong Chao Li; Ke Jia Liu; Bo Zhi Ren

doi:10.4028/www.scientific.net/AMR.690-693.1041

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Column Experiment on Cr (VI) Reduction with SiO₂-Coated Fe Nanocomposites

Abstract:

SiO₂-coated Fe nanocomposites (Fe@SiO₂) were prepared without using any of surface-coupling agents. The outer SiO₂ coating offered new possibilities for the control of Fe core agglomeration. In order to investigate Cr (VI) reduction in open systems that simulated subsurface conditions, sand column experiments were conducted. When 10 mg/L of Cr (VI) was injected into the columns, the removal efficiencies of Cr (VI) by the Fe@SiO₂ were 65 mg Cr/g Fe. The transport tests in deionized water-saturated sand columns indicated that 88.03% of Fe@SiO₂ was eluted. Nonetheless, the mobility of Fe@SiO₂ decreased when encountering 10 mmol/L Na⁺ and Ca²⁺. Presumably, 15 mg/L humic acid enhanced the mobility of Fe@SiO₂. Overall, the results of this study indicate that Fe@SiO₂ has the potential to become an effective reactive material for in situ groundwater remediation.