Skip to Main content Skip to Navigation
Journal articles

Rapid catalytic oxidation of arsenite to arsenate in an iron(III)/sulfite system under visible light

Abstract : Removal of arsenic in industrial wastewaters proceeds often through oxidation of As(III) to As(V) following by precipitation and/or adsorption. In this work, the catalytic oxidation of As(III) to As(V) in an iron(III)/sulfite system and the removal of As(V) under visible light using sunlight or a light-emitting diode lamp were investigated. Our results show a significant enhancement of efficiency of As(III) oxidation at near-neutral pH, whereas 93% of As(III) was removed from solution by centrifugal treatment after 30 min of irradiation. Mechanism investigations revealed that the pathways of As(III) oxidation at circumneutral pH involved free radicals (mainly HO, SO4− and SO5−) and ligand-to-metal charge transfer between As(III) and colloidal ferric hydroxide particles. Sequential addition of sulfite could improve the oxidation efficiency for water having high concentrations of As(III) (i.e., 66.7 μM). These results clearly show that the visible light/iron(III)/sulfite system significantly enhances As(III) oxidation. This finding may have promising implications in developing a new cost-effective technology for the treatment of arsenic-containing water using sunlight
Document type :
Journal articles
Complete list of metadata

Cited literature [8 references]  Display  Hide  Download
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Thursday, March 24, 2016 - 3:27:22 PM
Last modification on : Tuesday, December 14, 2021 - 10:38:06 AM
Long-term archiving on: : Monday, November 14, 2016 - 5:31:22 AM


Rapid catalytic oxidation of a...
Files produced by the author(s)



Jing Xu, Wei Ding, Feng Wu, Gilles Mailhot, Danna Zhou, et al.. Rapid catalytic oxidation of arsenite to arsenate in an iron(III)/sulfite system under visible light. Applied Catalysis B: Environmental, Elsevier, 2016, 186, pp.56-61. ⟨10.1016/j.apcatb.2015.12.033⟩. ⟨hal-01254801⟩



Les métriques sont temporairement indisponibles