| 自然水体生物膜胞外多糖吸附铅和镉的研究 |
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| 引用本文： | 康春莉,苏春彦,董德明,郭平,赵宇侠.自然水体生物膜胞外多糖吸附铅和镉的研究[J].吉林大学学报(理学版),2005,43(1):121-125. |
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| 作者姓名： | 康春莉 苏春彦 董德明 郭平 赵宇侠 |
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| 作者单位： | 吉林大学环境与资源学院， 长春 130023 |
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| 基金项目： | 国家自然科学基金(批准号:20077011)，吉林大学创新基金(批准号:450011022018). |
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| 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.
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| 关 键 词： | 生物膜 胞外多糖 吸附 铅 镉 |
| 文章编号： | 1671-5489(2005)01-0121-05 |
| 收稿时间： | 2004-06-07 |
| 修稿时间： | 2004年6月7日 |
Studies on Lead and Cadmium Adsorption by Exopolysaccharide of Natural Biofilm |
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| KANG Chun-li,SU Chun-yan,DONG De-ming,GUO Ping,ZHAO Yu-xia.Studies on Lead and Cadmium Adsorption by Exopolysaccharide of Natural Biofilm[J].Journal of Jilin University: Sci Ed,2005,43(1):121-125. |
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| Authors: | KANG Chun-li SU Chun-yan DONG De-ming GUO Ping ZHAO Yu-xia |
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| Institution: | College of Environment and Resources, Jilin University, Changchun 130023, China |
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| 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. |
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| Keywords: | biofilm exopolysaccharide adsorption lead cadmium |
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