Resistance and biosorption mechanism of silver ions by Bacillus cereus biomass  

作　　者：Li Li Qing Hu Jinghai Zeng Hongyan Qi Guoqiang Zhuang 

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

出　　处：《Journal of Environmental Sciences》2011年第1期108-111,共4页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.20707035,20777089);the High Technology Research and Development Programs (863) of China (No.2007AA06A407)

摘　　要：Biosorption of silver ions onto Bacillus cereus biomass was investigated. Overall kinetic experiments were performed for the determination of the necessary contact time for the attainment of equilibrium. It was found that the overall biosorption process was best described by pseudo second-order kinetic model. The crystals detected by scanning electron microscope and X-ray photoelectron spectroscopy suggested the precipitation was a possible mechanism of biosorption. The molecular genetics of silver resistance of B. cereus biomass was also detected and illustrated by a whole cell sensor tool.Biosorption of silver ions onto Bacillus cereus biomass was investigated. Overall kinetic experiments were performed for the determination of the necessary contact time for the attainment of equilibrium. It was found that the overall biosorption process was best described by pseudo second-order kinetic model. The crystals detected by scanning electron microscope and X-ray photoelectron spectroscopy suggested the precipitation was a possible mechanism of biosorption. The molecular genetics of silver resistance of B. cereus biomass was also detected and illustrated by a whole cell sensor tool.

关 键 词：Bacillus cereus BIOSENSOR BIOSORPTION CRYSTAL isotherms kinetics SILVER 

分 类 号：X703[环境科学与工程—环境工程] TS201.6[轻工技术与工程—食品科学]