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.
abstract: 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 qmax 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.
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea.
authors: Hongkyun
authors: H
authors: Lee
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea.
authors: Dohyeong
authors: D
authors: Kim
authors: Department of Chemistry, Dong-A University, Busan 604-714, South Korea.
authors: Jongsik
authors: J
authors: Kim
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea.
authors: Min-Kyu
authors: MK
authors: Ji
authors: Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Daejeon 305-350, South Korea.
authors: Young-Soo
authors: YS
authors: Han
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea.
authors: Young-Tae
authors: YT
authors: Park
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea; Department of Environmental Engineering, Yonsei University, Wonju 220 710, South Korea.
authors: Hyun-Shik
authors: HS
authors: Yun
authors: Green City Technology Institute, Korea Institute of Science and Technolgy, Seoul 136-791, South Korea. Electronic address: jchoi@kist.re.kr.
authors: Jaeyoung
authors: J
authors: Choi
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D001151:Arsenic / Q000633:toxicity*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D012722:Sewage; D014961:X-Ray Diffraction
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D058085:Iron Compounds; D008903:Minerals; D012722:Sewage; C094886:goethite; D020723:Glucuronic Acid; D001151:Arsenic
keywords: Acid mine drainage sludge; Adsorption; Alginate bead; As; Goethite