期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 292, 期 -, 页码 146-154出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.03.026
关键词
As; Adsorption; Acid mine drainage sludge; Goethite; Alginate bead
资金
- Korea Institute of Technology (KIST) [2E25640]
- Republic of Korea Ministry of Environment, Creen Remediation Research Center for Organic-Inorganic Combined Comtamination (GAIA Project) [201200055004]
- MSIP
- POSTECH in South Korea
Acid mine drainage sludge (AMDS) is a solid waste generated following the neutralization of acid mine drainage (AMD). This material entrapped in calcium alginate was investigated for the sorption of As(III) and As(V). Three different adsorbent materials were prepared: AMDS alginate beads (AABs), goethite alginate beads (GABs), and pure alginate beads. The effects of pH and the adsorption kinetics were investigated, and the adsorption isotherms were also evaluated. The optimum pH range using the AABs was determined to be within 2-10 for As(III) and 2-9 for As(V). Adsorption equilibrium data were evaluated using the Langmuir isotherm model, and the maximum adsorption capacity q(max) was 18.25 and 4.97 mg g(-1) for As(III) on AAB and GAB, respectively, and 21.79 and 10.92 mg g(-1) for As(V) on AAB and GAB, respectively. The adsorption of As(III) and As(V) was observed to follow pseudo-second order kinetics. The As K-edge X-ray absorption near-edge structure (XANES) revealed that the adsorbed As(III) on the AABs was oxidized to As(V) via manganese oxide in the AMDS. (C) 2015 Elsevier B.V. All rights reserved.
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