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http://dx.doi.org/10.7857/JSGE.2022.27.4.049

Stabilization Mechanisms of Powdered and Bead Type Stabilizer Made of Mg-Fe Layered Double Hydroxide (LDH) for the Arsenic Contaminated Soil  

Kim, Seonhee (Major of Earth and Environmental Sciences, Division of Earth Environmental System Science, Pukyong National University)
Kim, Kyeongtae (Major of Earth and Environmental Sciences, Division of Earth Environmental System Science, Pukyong National University)
Oh, Yuna (Major of Earth and Environmental Sciences, Division of Earth Environmental System Science, Pukyong National University)
Han, Yikyeong (Major of Environmental Geosciences, Division of Earth Environmental System Science, Pukyong National University)
Lee, Minhee (Major of Environmental Geosciences, Division of Earth Environmental System Science, Pukyong National University)
Publication Information
Journal of Soil and Groundwater Environment / v.27, no.4, 2022 , pp. 49-62 More about this Journal
Abstract
The magnesium and iron-based layered double hydroxide (Mg-Fe LDH) was synthesized by the co-precipitation process and the bead type LDH (BLDH, 5~6 mm in diameter) was manufactured by using the Mg-Fe LDH and the starch as a binder. To evaluate the feasibility of the BLDH as the As stabilizer in the soil, various experiments were performed and the As stabilization efficiency of the BLDH was compared to that of powdered type LDH (PLDH, <149 ㎛ in diameter). For the As sorption batch experiment, the As sorption efficiency of both of the PLDH and the BLDH showed higher than 99%. For the stabilization experiment with soil, the As extraction reducing efficiency of the PLDH was higher than 87%, and for the BLDH, it was higher than 80%, suggesting that the BLDH has similar the feasibility of As stabilization for the contaminated soil, compared to the PLDH. From the continuous column experiments, when more than 7% BLDH was added into the soil, the As stabilization efficiency of the column maintained at over 91% for 7 pore volume flushing (simulating about 21 months of rainfall) and slowly decreased down to 64% after that time (to 36 months) under the non-equilibrium conditions. Results suggested that more than 7% of BLDH added in As-contaminated soil could be enough to stabilize As in soil for a long time. The main As fixation mechanisms on the LDH were also identified through the X-ray fluorescence (XRF), the X-ray diffraction (XRD), and the Fourier transform infrared (FT-IR) analyses. Results showed that the LDH has enough of an external surface adsorption capacity and an anion exchange capability at the interlayer spaces. Results of SEM/EDS and BET analyses also supported that the Mg-Fe LDH used in this study has sufficient porous structures and outer surfaces to fix the As. The reduction of carbonate (CO32-) and sulfate (SO42-) anions in the LDH after the reaction between As and the LDH was observed through the FT-IR, the XRF, and the XRD analyses, suggesting that the exchange of some of these anions with the arsenate (H2AsO4- or HAsO42-) occurs at the LDH interlayers during the stabilization process in soil.
Keywords
arsenic; LDH; Mg-Fe LDH; soil pollution; sorption; stabilization;
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Times Cited By KSCI : 3  (Citation Analysis)
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