As(III) and As(V) removal from the aqueous phase via adsorption onto acid mine drainage sludge (AMDS) alginate beads and goethite alginate beads
- As(III) and As(V) removal from the aqueous phase via adsorption onto acid mine drainage sludge (AMDS) alginate beads and goethite alginate beads
- 이홍균; 김도형; 김종식; 지민규; 한영수; 박영태; 윤현식; 최재영
- As; Adsorption; Acid mine drainage sludge; Goethite; Alginate bead
- Issue Date
- Journal of hazardous materials
- VOL 292, 146-154
- Acid mine drainage sludge (AMDS) is a solid waste generated following the neutralization of acid minedrainage (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), goethitealginate beads (GABs), and pure alginate beads. The effects of pH and the adsorption kinetics were inves-tigated, and the adsorption isotherms were also evaluated. The optimum pH range using the AABs wasdetermined to be within 2–10 for As(III) and 2–9 for As(V). Adsorption equilibrium data were evalu-ated using the Langmuir isotherm model, and the maximum adsorption capacity qmaxwas 18.25 and4.97 mg g−1for As(III) on AAB and GAB, respectively, and 21.79 and 10.92 mg g−1for As(V) on AAB andGAB, respectively. The adsorption of As(III) and As(V) was observed to follow pseudo-second order kinet-ics. The As K-edge X-ray absorption near-edge structure (XANES) revealed that the adsorbed As(III) onthe AABs was oxidized to As(V) via manganese oxide in the AMDS.
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