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Biosorption and bioreduction of Cr(VI) by locally isolated Cr-resistant bacteria

Zakaria, Z. A. and Aruleswaran , N. and Kaur , S. and Ahmad, W. A. (2007) Biosorption and bioreduction of Cr(VI) by locally isolated Cr-resistant bacteria. Water Science And Technology, 56 (8). pp. 117-123. ISSN 0273-1223

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Official URL: http://www.iwaponline.com/wst/05608/0117/056080117...

Abstract

Cr(VI) biosorption and bioreduction ability of locally isolated Cr-resistant bacteria was investigated using the shake-flask technique. A mixture of S. epidermidis and B. cereus showed the highest minimum inhibitory concentration (MIC) level at 750 mg/L Cr(VI) followed by S. aureus and Bacillus sp. of 250 mg/L, and A. haemolyticus of 70 mg/L. From the Langmuir adsorption isotherm, the treatment of cells with heat-acid resulted in the highest amount of Cr(VI) adsorped (78.25 mg/g dry wt. for S. epidermidis) compared to heat-acetone (67.93 mg/g dry wt. Bacillus sp.), heat only (36.05 mg/g dry wt. S. epidermidis) or untreated cells (45.40 mg/g dry wt. S. epidermidis and B. cereus). FTIR analysis showed the involvement of amine groups in Cr(VI) adsorption. In the bioreduction study, A. haemolyticus was able to completely reduce Cr(VI) up to 50 mg/L

Item Type:Article
Uncontrolled Keywords:Bacteria; bioreduction; biosorption; chromium; FTIR Biomass
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:1416
Deposited By: Ms Zalinda Shuratman
Deposited On:05 Mar 2007 08:50
Last Modified:19 Nov 2010 09:23

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