As(III) and As(V) removal from the aqueous phase via adsorption onto acid mine drainage sludge (AMDS) alginate beads and goethite alginate beads

Title
As(III) and As(V) removal from the aqueous phase via adsorption onto acid mine drainage sludge (AMDS) alginate beads and goethite alginate beads
Authors
이홍균김도형김종식지민규한영수박영태윤현식최재영
Keywords
As; Adsorption; Acid mine drainage sludge; Goethite; Alginate bead
Issue Date
2015-07
Publisher
Journal of hazardous materials
Citation
VOL 292, 146-154
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/49512
ISSN
03043894
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KIST Publication > Article
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