摘要
Four chromium(Ⅵ)-resistant bacteria named YB-1,YB-2,YB-3 and YB-4 were isolated from Cr-electroplating sludge. YB-1 and YB-2 were identified as a member of Bacillus sp.based on morphology and Biolog Microstation System.The strain of YB-1 was selected to test for its resistance and ability to remove Cr(Ⅵ)from aqueous solution.The results indicate that YB-1 exhibits high MIC value which can almost reach 140 mg/L and the growth of YB-1 in liquid medium containing 60 mg/L Cr(Ⅵ)is affected especially in the late exponential phase and stationary phase.Furthermore,the potential of living and freeze-dried YB-1 biomass to remove Cr(Ⅵ)was studied in different pH,biosorbent dose,contact time and initial concentration using the batch method. At the optimal conditions,living and freeze-dried biomass are capable of absorbing 34.5 mg/g and 17.8 mg/g chromium(Ⅵ)at initial concentration of 60 mg/L,respectively.The adsorption data were fitted to Langmuir isotherm model for these two sorbents.Kinetic studies show that the rates of sorption all follow the pseudo-second order kinetics.
Four chromium（Ⅵ）-resistant bacteria named YB-1, YB-2, YB-3 and YB-4 were isolated from Cr-electroplating sludge. YB-1 and YB-2 were identified as a member of Bacillus sp. based on morphology and Biolog Microstation System. The strain of YB-1 was selected to test for its resistance and ability to remove Cr（Ⅵ） from aqueous solution. The results indicate that YB-1 exhibits high MIC value which can almost reach 140 mg/L and the growth of YB-1 in liquid medium containing 60 mg/L Cr（Ⅵ） is affected especially in the late exponential phase and stationary phase. Furthermore, the potential of living and freeze-dried YB-1 biomass to remove Cr（Ⅵ） was studied in different pH, biosorbent dose, contact time and initial concentration using the batch method. At the optimal conditions, living and freeze-dried biomass are capable of absorbing 34.5 mg/g and 17.8 mg/g chromium（Ⅵ） at initial concentration of 60 mg/L, respectively. The adsorption data were fitted to Langmuir isotherm model for these two sorbents. Kinetic studies show that the rates of sorption all follow the pseudo-second order kinetics.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第2期480-487,共8页
Transactions of Nonferrous Metals Society of China
基金
Project(04JJ3013)supported by the Natural Science Foundation of Hunan Province,China
Project(20050532009)supported by theDoctoral Fund of Ministry of Education of China
关键词
铬
张力
电镀技术
合金
Bacillus sp.
Cr（Ⅵ）
minimal inhibitory concentration
biosorption
kinetic model
