Equilibrium and Kinetics of Biosorption of Chromium(VI) from Aqueous Solutions by B82 Xanthan Beads

Document Type : Research Article


1 Department of Occupational Health Engineering, Faculty of Public Health, Tehran University of Medical Science, Tehran, I.R. IRAN

2 Department of Industrial Microbiology, Al-Zahra University, Tehran, I.R. IRAN

3 Department of Social Medicine, School of Medicine, Babol University of Medical Sciences, Babol, I.R. IRAN


Contamination of the aqueous environment by heavy metals is a worldwide environmental problem. Biosorption of chromium(VI) from aqueous solutions by xanthan gum biomass was studied in a batch system. The heavy metals uptake was found to be rapid and reached to 88-96% of equilibrium capacity of biosorption in 15min. The pseudo second-order and saturation rate equations were found in the best fitness with the kinetic data (R2 > 0.99). The data obtained from experiments of single-component biosorption isotherm were analyzed using the Freundlich, Langmuir, Freundlich-Langmuir and Redlich-Peterson isotherm models. The Redlich-Peterson equation described the biosorption isotherm of chromium(VI) with high correlation coefficient (R2 > 0.99) and better than the other equations. According to the Langmuir model, the maximum uptake capacities (qm) of xanthan gum. for Pb2+ and Cd2+ were obtained as 1.70 and 1.02mmol/g, respectively. Although the xanthan gum used in this study can be classified as an efficient biosorbent


Main Subjects

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