Kinetic and Equilibrium Studies of Cr(VI) Biosorption by Dead <Emphasis Type="Italic">Bacillus licheniformis</Emphasis> Biomass |
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Authors: | Ming Zhou Yunguo Liu Guangming Zeng Xin Li Weihua Xu Ting Fan |
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Institution: | (1) College of Environmental Science and Engineering, Hunan University, Changsha, 410082, P.R. China |
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Abstract: | Many studies have been carried out on the biosorption capacity of different kinds of biomass. However, reports on the kinetic
and equilibrium study of the biosorption process are limited. In our experiments, the removal of Cr(VI) from aqueous solution
was investigated in a batch system by sorption on the dead cells of Bacillus licheniformis isolated from metal-polluted soils. Equilibrium and kinetic experiments were performed at various initial metal concentrations,
pH, contact time, and temperatures. The biomass exhibited the highest Cr(VI) uptake capacity at 50°C, pH 2.5 and with the
initial Cr(VI) concentration of 300 mg/g. The Langmuir and Freundlich models were considered to identify the isotherm that
could better describe the equilibrium adsorption of Cr(VI) onto biomass. The Langmuir model fitted our experimental data better
than the Freundlich model. The suitability of the pseudo first-order and pseudo second-order kinetic models for the sorption
of Cr(VI) onto Bacillus licheniformis was also discussed. It is better to apply the pseudo second-kinetic model to describe the sorption system. |
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Keywords: | Biosorption Bacillus licheniformis Cr(VI) equilibrium isotherms kinetic modeling |
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