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Influence of extracellular polymeric substances (EPS) on Cd adsorption by bacteria |
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| Authors: | Wei Xing Fang Linchuan Cai Peng Huang Qiaoyun Chen Hao Liang Wei Rong Xinming |
| Institution: | a State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China b Key Laboratory of Subtropical Agricultural Resources and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China c College of Science, Huazhong Agricultural University, Wuhan 430070, China |
| Abstract: | The role of extracellular polymeric substances (EPS) in Cd adsorption by Bacillus subtilis and Pseudomonas putida was investigated using a combination of batch adsorption experiments, potentiometric titrations, Fourier transform infrared spectroscopy (FTIR). An increased adsorption capacity of Cd was observed for untreated bacteria relative to that for EPS-free bacteria. Surface complexation modeling of titration data showed the similar pKa values of functional groups (carboxyl, phosphate and hydroxyl) between untreated and EPS-free bacteria. However, site concentrations on the untreated bacteria were found to be higher than those on the EPS-free bacteria. FTIR spectra also showed that no significant difference in peak positions was observed between untreated and EPS-free bacteria and carboxyl and phosphate groups were responsible for Cd adsorption on bacterial cells. The information obtained in this study is of fundamental significance for understanding the interaction mechanisms between heavy metals and biofilms in natural environments. |
| Keywords: | Bacillus subtilis Pseudomonas putida EPS Adsorption Cd |
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