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Oxidative removal of arsenite by Fe(II)- and polyoxometalate (POM)-amended zero-valent aluminum (ZVAl) under oxic conditions

Wu, C.C ; Hus, L.C ; Chiang, P.N ; Liu, J.C ; Kuan, W.H ; Chen, C.C ; Tzou, Y.M ; Wang, M.K ; Hwang, C.E

Water Research, 01 May 2013, Vol.47(7), pp.2583-2591 [Periódico revisado por pares]

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  • Título:
    Oxidative removal of arsenite by Fe(II)- and polyoxometalate (POM)-amended zero-valent aluminum (ZVAl) under oxic conditions
  • Autor: Wu, C.C ; Hus, L.C ; Chiang, P.N ; Liu, J.C ; Kuan, W.H ; Chen, C.C ; Tzou, Y.M ; Wang, M.K ; Hwang, C.E
  • Assuntos: Arsenic ; Zero-Valent Aluminum ; Ferrous Ions ; Polyoxometalate ; Al Beverage Can Waste ; Arsenic ; Zero-Valent Aluminum ; Ferrous Ions ; Polyoxometalate ; Al Beverage Can Waste ; Engineering
  • É parte de: Water Research, 01 May 2013, Vol.47(7), pp.2583-2591
  • Descrição: Abiotic transformation of As(III) to As(V) is possible which would decrease As toxicity. This study investigated the potential applications of zero-valent Al (ZVAl) or Al wastes, such as Al beverage cans, for converting As(III) to As(V) in an acidic solution under aerobic conditions. Results showed that As(III) could not be oxidized by ZVAl within 150 min reaction at pH 1 because of the presence of an oxide layer on ZVAl. However, 85 μM As(III) could be completely oxidized with the addition of Fe(II) or POM due to the generation of a Fenton reaction or the enhancement of H2O2 production, respectively, on the ZVAl surfaces. Because Fe(II) or polyoxometalate (POM) exhibited more stable at low pH and scavenged rapidly the H2O2 produced on the aerated ZVAl surfaces, OH radical productions were more efficient and As(III) was rapidly oxidized in the ZVAl/O2 system with theses two catalysts. The catalytic oxidation kinetics of As(III) in the presence of Fe(II) or POM were best described...
  • Idioma: Inglês

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