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S. P. Pande, L. S. Deshpande, P. M. Patni and S. L. Lutade, “Arsenic Removal Studies in Some Groundwaters of West Bengal, India,” Journal of Environmental Science and Health, Part A: Toxic / Hazardous Substances and Environmental Engineering, Vol. A32, No. 7, 1997, pp. 1981-1987.

has been cited by the following article:

• TITLE: Arsenic(III) Remediation from Contaminated Water by Oxidation and Fe/Al Co-Precipitation

  AUTHORS: Wensheng Zhang, Pritam Singh, Touma B. Issa

  KEYWORDS: Manganese Oxides, Iron Hydroxides, Arsenic Remediation, Fe/Al Coagulants, Contaminated Water

  JOURNAL NAME: Journal of Water Resource and Protection, Vol.3 No.9, September 29, 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.