Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Geological Journal of China Universities》 2007-04
Add to Favorite Get Latest Update

Experimental Study on Adsorption of Cu~(2+) on Paenibacillus polymyxa

DING Yu,LU Xian-cai,ZHOU Yue-fei,LU Jian-jun,WANG Ru-cheng (State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China)  
The microorganisms can clearly affect the mobility of metal ions in the environmental fluids because of abundant chemical groups on the cell surface.Adsorption of ions on the microorganism surface plays important roles in various biogeochemical processes,such as mineralization,nucleation and crystal growth.In order to disclose the adsorption mechanisms and to understand the adsorption capacity of bacteria,this paper experimentally studies the Cu 2+ adsorption behavior of a widely occurring bacterium,Paenibacillus polymyxa.Firstly,consecutive acid titration was carried out.The results show that the range of optimum pH at which the Paenibacillus polymyxa absorbs H+is 7.54~6.00,and the surface of Paenibacillus polymyxa cell bears abundant negative charges,which determines the ion adsorption capacity.Then,the Cu 2+ adsorption isotherm of Paenibacillus polymyxa was measured.As the solution pH increases linearly with the increasing Cu adsorption capacity,it is deduced that the ion exchange between surface H + and Cu 2+ may be the potential mechanism of the apparent adsorption.The data fitting indicates that the biosorption process agrees well with both the Langmuir model and Freundlich model.According to the isotherm equation of Langmuir model,the calculated adsorption capacity of Cu 2+ is as high as 1.69×10 -7 mg/cell.
【Fund】: 国家重点基础研究发展计划(2007CB815603);; 国家自然科学基金(40573001);; 博士点基金(20050284043 20050284044)资助成果
【CateGory Index】: Q93
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved