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Kinetics of Reduction of Cr (VI) by D-glucosein Aqueous Phase Kinetics of Reduction of Cr (VI) by D-glucosein Aqueous Phase

Authors : Sutanu Maiti, Sudarsan Neogi and Binay K. Dutta



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Abstract

Among the various reducing agents used for remediation of Cr(VI) in contaminated soil, glucose is an attractive one since it has reasonable cost and does not have any adverse effect when an excess is used to satisfy the process needs. The objective of this work was to investigate the process of reduction and the kinetics and mechanism for Cr(VI) reduction by D-glucose in the aqueous phase. Experimental reduction rates were determined for different values of the process parameters such as the mole ratio of the reactants, pH, temperature as well as the initial Cr(VI) concentration. Nearly 60% reduction of Cr(VI) has been achieved after 1 h with stoichiometric amount of glucose in aqueous phase. Almost complete reduction could be
achieved by using 50% excess glucose. The effective reduction of Cr(VI) by D-glucose suggests that this is a potentially useful technique for reduction of Cr(VI) for ex situ remediation of Cr(VI) contaminated soil.
 

Effect of molar ratios of Cr (VI) to glucose on the reduction of Cr(VI) at initial Cr(VI) concentration 5200 mg/L, pH 4.45, temperature 25ºC and stirring speed = 400 rpm

Keyword

Kinetics, hexavalent chromium, reduction, D-glucose, diphenyl carbazide, ex situ, soil remediation.