Journal article
Arsenic(III) remediation from contaminated water by oxidation and Fe/Al co-precipitation
Journal of Water Resource and Protection, Vol.3(9)
2011
Abstract
Battery grade γ-MnO2 powder was investigated as an oxidant and an adsorbent in combination with Fe/Al coagulants for removal of arsenic from contaminated water. Simultaneous oxidation of As(III) and removal by coprecipitation/adsorption (one step process) was compared with pre-oxidation and subsequent removal by coprecipitation/adsorption (two step process). The rate of As(III) oxidation with MnO2 is completed in two stages: rapid initially followed by a first order reaction. As(III) is oxidised to As(V) by the MnO2 with a release of approximately 1:1 molar Mn(II) into the solution. No significant pH effect on oxidation of As(III) was observed in the pH range 4 - 6. The rate showed a decreasing trend above pH 6. The removal of As(V) by adsorption on the MnO2 decreased significantly with increasing pH from 4 to 8. The adsorption capacity of the γ-MnO2 with particle size 90% passing 10 µm was determined to be 1.5 mg/g at pH 7. MnO2 was found to be more effective as an oxidant for As(III) in the two step process than in the one step process.
Details
- Title
- Arsenic(III) remediation from contaminated water by oxidation and Fe/Al co-precipitation
- Authors/Creators
- W. Zhang (Author/Creator)P. Singh (Author/Creator)T.B. Issa (Author/Creator)
- Publication Details
- Journal of Water Resource and Protection, Vol.3(9)
- Publisher
- Scientific Research Publishing
- Identifiers
- 991005541051907891
- Copyright
- © 2011 SciRes
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
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