【摘要】 采用长春南湖水中优势菌种胞外多糖分别对Pb2+和Cd2+进行吸附实验,从离子浓度、温度、时间、pH值、铅镉共存等方面对其吸附规律进行了初步研究,结果表明,Langmuir和Freundlich方程均可描述自然水体生物膜胞外多糖吸附Pb2+和Cd2+的热力学过程.胞外多糖吸附Pb2+和Cd2+的动力学吸附特征符合Langmuir Hinshelwood方程的一级反应模式.Cd2+干扰胞外多糖对Pb2+的吸附,Pb2+也干扰胞外多糖对Cd2+的吸附.更多还原

【Abstract】 The adsorption of lead(Ⅱ) and cadmium(Ⅱ) on the exopolysaccharide of natural biofilm was (investigated.)The exopolysaccharide was obtained from the extracellular polymers of superiority bacteria in (Changchun) South Lake. The results show that both Langmuir and Freundlich isotherm equations could describe the thermodynamics adsorption processes of Pb and Cd on the exopolysaccharide. One order kinetic model of Langmuir-Hinshelwood equation could describe the kinetic adsorption characteristics of heavy metals.The (existence) of Cd affects the adsorption of Pb, and Pb also affects the adsorption of Cd.Temperature and pH (value) could also affect the adsorption processes.更多还原