期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 326, 期 1-3, 页码 197-207出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2003.12.012
关键词
arsenite; arsenate; removal; manganese oxide-resin
Based on KMnO4 oxidative capacity, a polystyrene matrix loaded with manganese dioxide was synthesized from an anionic commercial resin in chloride form. This medium, called R-MnO2, was tested for As(V) retention and for As(III) simultaneous oxidation and removal. Equilibrium was reached in 2 h and isotherms showed that R-MnO2 maximal capacities towards As(III) and As(V) are, respectively, 0.7 and 0.3 mmol/g. Various mechanisms were involved in As(III) retention: oxidation of H3AsO30 by MnO2(s) leading to the formation of HAsO42- and Mn2+, fixation of As(V) formed on the resin beads and precipitation of Mn-3(AsO4)(2) with Mn2+ released. Successive arsenic desorption and retention steps were performed and showed that the quantity desorbed was low compared to the quantity removed during the first stage of the process. A second removal step, carried out under the same conditions as the first one, proved that the matrix second-removal capacity was weak. This solid sorbent, although not reusable, can be considered in field application as arsenic retention is really strong. (C) 2004 Elsevier B.V. All rights reserved.
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