期刊
JOURNAL OF ENVIRONMENTAL ENGINEERING
卷 139, 期 3, 页码 410-421出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0000651
关键词
U(VI); Chlorella vulgaris; Biosorption; Isotherms and kinetics; Thermodynamics
资金
- Ministry of Science, Iran
- Tarbiat Modares University (TMU)
- Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
- Ministry of Science
In this study, the mechanism involved in the removal of U(VI) from aqueous solution by the green unicellular microalgae, Chlorella vulgaris, was examined through a series of batch experiments. The effect of various operation parameters such as solution pH, biomass dose, temperature, and different concentrations of U(VI) on the uptake capacity and removal efficiency of C. vulgaris was evaluated. The adsorption process could be defined well by both the Langmuir and Freundlich isotherms with R-2 of 0.99 and 0.97, respectively. The kinetic data were fitted to a pseudo second-order model with the R-2 value of 0.99. The thermodynamic equilibrium parameters obtained at different temperatures were used to evaluate the thermodynamic constants, Delta G degrees, Delta H degrees, and Delta S degrees. The negative value of Gibbs free energy, Delta G degrees, demonstrated the endothermic nature of the biosorption process. The adsorption-desorption cycle results demonstrated that this species of algae can be regenerated using 1 M of HCl. The recovery yield of U(VI) ions was found to be 90%, and the biosorption had good reusability after four consecutive adsorption-desorption cycles. The biosorption of U(VI) was found to be adversely affected also by the presence of Al(III) cations, whereas other ions seemed to have negligible effect on the process. The results suggested that C. vulgaris biomass is suitable as a sorbent materials for recovery and biosorption of U(VI) ions from aqueous solution. DOI: 10.1061/(ASCE)EE.19437870.0000651. (C) 2013 American Society of Civil Engineers.
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