自然水体生物膜胞外蛋白质吸附铅和镉的研究  

Studies on Pb^(2+) and Cd^(2+) Adsorption by Extracellular Protein of Natural Biofilm

作　　者：康春莉[1] 苏春彦[1] 郭平[1] 赵宇侠[1] 董德明[1] 

机构地区：[1]吉林大学环境与资源学院,长春130021

出　　处：《高等学校化学学报》2006年第7期1245-1246,共2页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20077011);吉林大学创新基金(批准号:450011022018)资助

摘　　要：The adsorption of Pb2+ and Cd2+ on the extracellular protein of natural biofilm was investigated.The extracellular protein was obtained from the extracellular polymers of superiority bacteria of natural biofilm cultivated in C South Lake of Changchun.The results showed that both Langmuir and Freundlich isotherm equations could be used to describe the thermodynamics adsorption processes of Pb2+ and Cd2+ on the extracellular protein.One order kinetic model of Langmuir-Hinshelwood equation could be used to describe the kinetic adsorption characteristics of heavy metals.The existence of Cd2+ affected the adsorption of Pb2+,and Pb2+ also affected the adsorption of Cd2+.Temperature and pH value could also affect the adsorption processes.The mechanism of Pb2+ and Cd2+ adsorption by the extracellular protein were studied by infrared spectra and the functional groups participated in the adsorption were identified.The adsorption of Pb^2＋ and Cd^2＋ on the extracellular protein of natural biofilm was investigated. The extracellular protein was obtained from the extracellular polymers of superiority bacteria of natural biofilm cultivated in C South Lake of Changchun. The results showed that both Langmuir and Freundlich isotherm equations could be used to describe the thermodynamics adsorption processes of Pb^2＋ and Cd^2＋ on the extracellular protein. One order kinetic model of Langmuir-Hinshelwood equation could be used to describe the kinetic adsorption characteristics of heavy metals. The existence of Cd^2＋ affected the adsorption of Pb^2＋ , and Pb^2＋ also affected the adsorption of Cd^2＋. Temperature and pH value could also affect the adsorption processes. The mechanism of Pb^2＋ and Cd^2＋ adsorption by the extracellular protein were studied by infrared spectra and the functional groups participated in the adsorption were identified.

关 键 词：生物膜 胞外蛋白质 吸附 PB^2+ CD^2+ 

分 类 号：X132[环境科学与工程—环境科学]