title: Highly effective biosorption of Sr(II) from low level radioactive wastewater.
abstract: Bacillus subtilis was first used to remove Sr(II) from low-level radioactive wastewater. Influence parameters, biosorption kinetics and biosorption equilibrium were investigated. The results showed that the maximum adsorption capacity of Sr(II) at over 2,000 mg g(-1) by Bacillus subtilis was higher than for other biosorbents. At pH 6.3, Sr(II) concentration of 15 mg L(-1), biomass dosage of 0.3 g L(-1) and temperature of 20 °C, the maximum removal efficiency was as high as 96.3% at 1,440 minutes. The biosorption kinetics and the equilibrium isotherm data can be described by the pseudo-second-order equation and Freundlich isotherm equation, respectively. The negative values of ΔG and the positive values of ΔH implied that Sr(II) biosorption on Bacillus subtilis was a spontaneous and endothermic process. Fourier transform infrared spectroscopy indicated that the functional groups, hydroxyl, carboxylate and amide groups, might participate in the interaction between Sr(II) and Bacillus subtilis.
authors.affiliation: State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, 621010 Mianyang, China E-mail: liuxun@swust.edu.cn.
authors.forename: Xun
authors.initials: X
authors.lastname: Liu
authors.affiliation: State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, 621010 Mianyang, China E-mail: liuxun@swust.edu.cn.
authors.forename: Wenyuan
authors.initials: W
authors.lastname: Hu
authors.affiliation: China National Quality Supervision and Inspection Centre for Alcoholic Beverage Products and Processed Food, 646000 Luzhou, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Huang
authors.affiliation: State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, 621010 Mianyang, China E-mail: liuxun@swust.edu.cn.
authors.forename: Hongquan
authors.initials: H
authors.lastname: Deng
mesh_terms: D000327:Adsorption; D001412:Bacillus subtilis / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013324:Strontium / Q000378:metabolism*; D013326:Strontium Radioisotopes / Q000378:metabolism; D013696:Temperature; D013997:Time Factors; D062065:Wastewater / Q000032:analysis*; D014875:Water Pollutants, Radioactive / Q000378:metabolism*
chemical_list: D013324:Strontium; D013326:Strontium Radioisotopes; D062065:Wastewater; D014875:Water Pollutants, Radioactive