中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 6 June 2013 |
（1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education,Hunan University, Changsha 410082, China）
Abstract:The ability of Bacillus subtilis immobilized into chitosan beads (BICB) to remove Cu(II) from aqueous solution was studied. The effects of pH, biosorbent dosage, temperature, initial Cu(II) concentration and contact time on removal of Cu(II) were studied using batch adsorption experiments. The results show that the Cu(II) absorption strongly depends on pH and the optimum pH is 6. Compared with chitosan beads (CB), the BICB has higher efficiency and capacity on Cu(II) removal. The Langmuir isotherm model (R2=0.994) is proved to fit the equilibrium data best. The maximum adsorption capacity determined from Langmuir model is 100.70 mg/g. The kinetic data fit well with the pseudo-second-order model and the correlation coefficient is greater than 0.999. The biosorbents are successfully regenerated using 0.1 mol/L NaOH solution.
Key words: biosorption; Bacillus subtilis; Bacillus subtilis immobilized into chitosan beads (BICB); Cu(II); isotherms; kinetic
