摘要
室内模拟研究了长春南湖水生物膜中有机组分即胞外聚合物、微生物非活性细胞和微生物活性细胞对Cd2+的吸附特征及其影响因素。结果表明:3种有机组分对Cd2+的吸附过程分为快速和慢速阶段,达到吸附平衡的时间分别为360、100和100 min;Cd2+的吸附量均在pH为6 h达到最佳;在实验所选温度范围内,胞外聚合物在30℃时对Cd2+的吸附量最大,而温度对Cd2+在微生物非活性细胞和活性细胞的影响不显著;Cd2+在3种有机组分上的吸附均符合Langmuir和Freundlish热力学方程,吸附能力为胞外聚合物>微生物非活性细胞>微生物活性细胞。在有Pb2+共存的条件下,Langmuir和Freundlish热力学方程仍然适合描述3种有机组分对Cd2+的热力学吸附过程,但Cd2+的吸附量和饱和吸附量均减小。
Cd^2＋ biosorption by the organic components （exopolymer, nonliving body bacterium and living bacterium） on the dominant bacterium obtained from the surface coatings in natural waters and the effects of biosorption time, temperature and initial pH were investigated. The results showed that Cd^2＋ biosorption process by the organic components above was divided into fast phase and slow phase, biosorption equilibrium time was respectively was 360, 100 and 100 min; the maximum biosorption amount of Cd^2＋ was all reached at pH=6; Cd^2＋ biosorption value by exopolymer was optimum at 30 ℃, the effect of temperature on the biosorption ability of nonliving body bacterium and living body bacterium was negligible; Both the Langmuir and Freundlich equation could describe the course of the biosorption of on Cd^2＋ by the organic components, the biosorption ability of exopolymer is much higher than nonliving body bacterium and living body bacterium; the thermodynamics experiments also carried on when the Pb^2＋ was present, the biosorption of Cd^2＋ by the three organic components was also followed the Langmuir and Freundlich equation, but the biosorption amount and the saturated biosorption amount of Cd^2＋ of was decreased.
出处
《生态环境》
CSCD
北大核心
2005年第5期636-639,共4页
Ecology and Environmnet
基金
国家自然科学基金项目(20077011)
吉林大学创新基金项目(450011022018)
关键词
胞外聚合物
非活性细胞
活性细胞
吸附
镉
exopolymer
nonliving body bacterium
living body bacterium
biosorption
cadmium
