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R. K. Sinha, A. M. Bandyopadhyaya, B. Roy, G. Poddar, I. Chakravarty, A. Majumdar and K. J. Nath, “Use of Some Iron Salts on Total Removal of Arsenic from Arsenical Tubewell Water of West Bengal,” Journal of the Institution of Chemists, Vol. 65, No. 1, 1993, pp. 30-31.

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.