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细菌胞壁多糖对水体中低浓度Pb2+和Cd2+的吸附研究
引用本文:郭平,康春莉,李军,郭鹏.细菌胞壁多糖对水体中低浓度Pb2+和Cd2+的吸附研究[J].微生物学通报,2004,31(6):62-67.
作者姓名:郭平  康春莉  李军  郭鹏
作者单位:1. 吉林大学环境与资源学院,长春,130023
2. 吉林燃料乙醇有限责任公司,吉林,132101
基金项目:吉林省环保局资助项目(No.2001017) 吉林大学创新基金(No.403010123013)
摘    要:室内模拟研究了长春市伊通河天然水环境中优势细菌胞壁多糖对Pb2+和Cd2+吸附,结果发现胞壁多糖对pb2+和Cd2+的吸附量分别在pH为4.5、5.0时最大;且均分为两个阶段,即当pH<4.5,对Pb2+的吸附量与pH呈正相关,当pH>4.5时,对Pb2+的吸附量与pH呈负相关;对Cd2+的吸附量在pH<5.0时与pH呈正相关,在pH>5.0时与pH呈负相关.温度对胞壁多糖吸附Pb2+和Cd2+影响不显著;吸附体系在8 h达到吸附平衡.共存Cd2+对胞壁多糖吸附Pb2+影响显著,而共存Pb2+对吸附Cd2+不显著.胞壁多糖对Pb2+和Cd2+吸附过程符合Iangmuir和Freundlich热力学等温方程;胞壁多糖吸附Pb2+和Cd2+的动力学过程分为快速阶段和慢速阶段,其中慢速阶段符合二级吸附速率动力学方程.

关 键 词:天然水  优势细菌  胞壁多糖  铅和镉  热力学方程  动力学方程
文章编号:0253-2654(2004)06-0062-06
修稿时间:2004年2月22日

Adsorption of Pb2 + and Cd2+ Onto Polysaccharide of Dominant Bacterial Cell Wall in Natural Water
GUO Ping,KANG Chun-Li,LI Jun,GUO Peng.Adsorption of Pb2 + and Cd2+ Onto Polysaccharide of Dominant Bacterial Cell Wall in Natural Water[J].Microbiology,2004,31(6):62-67.
Authors:GUO Ping  KANG Chun-Li  LI Jun  GUO Peng
Institution:GUO Ping 1 KANG Chun-Li 1** LI Jun 1 GUO Peng 2
Abstract:The adsorption of Pb 2+ and Cd 2+ ions onto polysaccharide of dominant bacterial cell wall in natural water was studied . The polysaccharide of cell wall exhibited the highest Pb 2+ uptake capacity at the initial pH value of 4.5, showed the direct correlation among 2.5 and 4.5, and showed the negative correlation among 4.5 and 7.0. The polysaccharide of cell wall exhibited the highest Cd 2+ uptake capacity at the initial pH value of 5.0, showed the direct correlation among 2.0 and 5.0, and showed the negative correlation among 5.0 and 7.0. Temperature had no influence on the adsorption of Pb 2+ and Cd 2+.The adsorption equilibrium was established in about 8 h and the adsorbed heavy metal ions had little change further with time. The equilibrium was well described by Langmuir and Freundlich isotherm models in the studied concentration range of Cd 2+ and Pb 2+ ions. The kinetic processes of the adsorption included fast phase and slow phase, and the latter followed the second-order rate expression.
Keywords:Natural water  Dominant bacteria  Polysaccharide of cell wall  Lead and cadmium  Thermodynamics equation  Kinetics equation
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