自然水体生物膜胞外蛋白质吸附铅和镉的研究

本文通过长春市南湖水中生物膜优势菌种胞外蛋白吸附Pb2+和Cd2+的实验, 研究了胞外蛋白吸附重金属的规律.

Studies on Pb2+ and Cd2+ Adsorption by Extracellular Protein of Natural Biofilm

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.