title: Nanocasted synthesis of magnetic mesoporous iron cerium bimetal oxides (MMIC) as an efficient heterogeneous Fenton-like catalyst for oxidation of arsenite.
abstract: Magnetic mesoporous iron cerium bimetal oxides (MMIC) with large surface area and pore volume was synthesized via the hard template approach. This obtained MMIC was easily separated from aqueous solution with an external magnetic field and was proposed as a heterogeneous Fenton-like catalyst for oxidation of As(III). The MMIC presented excellent catalytic activity for the oxidation of As(III), achieving almost complete oxidation of 1000ppb As(III) after 60min and complete removal of arsenic species after 180min with reaction conditions of 0.4g/L catalyst, pH of 3.0 and 0.4mM H2O2. Kinetics analysis showed that arsenic removal followed the pseudo-first order, and the pseudo-first-order rate constants increased from 0.0014min(-1) to 0.0548min(-1) as the H2O2 concentration increased from 0.04mM to 0.4mM. On the basis of the effects of XPS analysis and reactive oxidizing species, As(III) in aqueous solution was mainly oxidized by OH radicals, including the surface-bound OHads generated on the MMIC surface which were involved in Fe(2+) and Ce(3+), and free OHfree generation by soluble iron ions which were released from the MMIC into the bulk solution, and the generated As(V) was finally removed by MMIC through adsorption.
authors: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors: Zhipan
authors: Z
authors: Wen
authors: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: zhangyalei@tongji.edu.cn.
authors: Yalei
authors: Y
authors: Zhang
authors: College of Civil Engineering, Tongji University, Shanghai 200092, China.
authors: Chaomeng
authors: C
authors: Dai
authors: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors: Zhen
authors: Z
authors: Sun
mesh_terms: D000327:Adsorption; D018053:Arsenites / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D060328:Magnetic Phenomena; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D018053:Arsenites; D010087:Oxides; D014874:Water Pollutants, Chemical; D002563:Cerium; D007501:Iron; C015001:arsenite
keywords: Bimetal oxides; HPLC–ICP–MS; Heterogeneous catalyst; MMIC