Studies on the Bioremediation of Chromium from Aqueous Solutions Using C-paurometabolum

Prabhakaran, Divyasree C and Subramanian, S (2017) Studies on the Bioremediation of Chromium from Aqueous Solutions Using C-paurometabolum. In: TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, 70 (2). pp. 497-509.

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Abstract

The potential of Corynebacterium paurometabolum, a Gram positive acid fast bacterium, has been investigated as a biosorbent for the remediation of Cr(VI) and Cr(III). A complete bioremediation of Cr(VI) has been achieved at an equilibrium time of 2 h, initial Cr(VI) concentration of 4 mg/L, pH 1 and a biomass loading of 3.1 x 10(10) cells/mL, with equal contributions from biosorption and bioreduction processes, while 55% biosorption has been accomplished at an equilibrium time of 2 h, initial Cr(III) concentration of 4 mg/L, pH 3 and a biomass loading of 3.4 x 10(10) cells/mL with respect to the bioremediation of Cr(III). The biosorption isotherms of Cr(VI) and Cr(III) exhibited a typical Langmuirian behaviour. The Gibbs free energies (a dagger G) have been determined to be -25.5 and -29.5 kJ/mol respectively for Cr(VI) and Cr(III), suggestive of chemisorption. The desorption studies have indicated only a marginal release of Cr(VI)/Cr(III) into the bulk solution, attesting to the irreversible nature of biosorption. FTIR studies have revealed the involvement of hydroxyl, carboxyl, amino and phosphate groups in the biosorption of Cr(VI)/Cr(III). Electrokinetic and X-ray photoelectron spectroscopic studies have provided evidence in support of the biosorption and bioreduction mechanisms of chromium remediation.

Item Type:	Journal Article
Publication:	TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
Publisher:	SPRINGER INDIA, 7TH FLOOR, VIJAYA BUILDING, 17, BARAKHAMBA ROAD, NEW DELHI, 110 001, INDIA
Additional Information:	Copy right for this article belongs to the SPRINGER INDIA, 7TH FLOOR, VIJAYA BUILDING, 17, BARAKHAMBA ROAD, NEW DELHI, 110 001, INDIA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Mar 2017 04:31
Last Modified:	09 Mar 2017 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/56323

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