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Received July 10, 2006
Accepted November 3, 2006
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Arsenic adsorption mechanism on clay minerals and its dependence on temperature
Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Korea 1Regional Research Laboratory (RRL), Bhubaneswar 751013, India 2HydroMet Proc, Bhubaneswar 751018, India
Korean Journal of Chemical Engineering, May 2007, 24(3), 426-430(5), 10.1007/s11814-007-0073-z
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Abstract
In the present study, the As(V) removal efficiency of different clay minerals was investigated as a function of solution pH, time, As(V) concentration, and temperature. Arsenic mobility was also investigated by determining the As(V) released from the loaded samples by leaching with various aqueous solutions. The kinetics of adsorption was observed to be fast and reached equilibrium within 3 h. As(V) adsorption on studied clays was pH dependent and maximum adsorption was achieved at pH 5.0. The maximum adsorption capacity was calculated by fitting the Langmuir equation to the adsorption isotherms and found to be 0.86, 0.64, and 0.52 mg As(V)/g of kaolinite, montmorillonite, and illite, respectively. The negative effect of temperature on As(V) adsorption showed the interactions to be exothermic. Based on the results, it was found that among the studied clay minerals, kaolinite was the best As(V) adsorbent and montmorillonite had strong retention capacity. The electrokinetic behavior of kaolinite and montmorillonite was modified in the presence of As(V), indicating that adsorption involves inner sphere surface complexation and strong specific ion adsorption.
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Mohapatra D, Mishra D, Roy Chaudhury G, Das RP, Sep. Purif. Technol., 49, 223 (2006)
Naseem R, Tahir SS, Water Res., 35, 3982 (2001)
Bhattacharyya KG, Gupta SS, Colloids Surf. A: Physicochem. Eng. Asp., 277, 191 (2006)
Halter WE, Pfeifer HR, Appl. Geochem., 16, 793 (2001)
Goldberg S, Soil Sci. Soc. Am. J., 66, 413 (2002)
Griffin RA, Shimp NF, Attenuation of pollutants in municipal landfill leachate by clay minerals, EPA-600/2-78-157 (1978)
Sposito G, The chemsitry of soils, Oxford Univesity Press, New York (1989)
US EPA, Treatment of arsenic residuals from drinking water removal processes, EPA/600/R-01/033, Cincinnate, OH (2001)
Ladeira ACQ, Ciminelli VST, Water Res., 38, 2087 (2004)
Bauer M, Blodau C, Science of the Total Environment, 354, 179 (2006)
Arai Y, Elzinga EJ, Sparks DL, J. Colloid Interface Sci., 235(1), 80 (2001)
Hunter RJ, Zeta potential in colloid science, Academic press, London (1981)
