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Thermodynamics of binding interactions between extracellular polymeric substances and heavy metals by isothermal titration microcalorimetry
Yan, Peng1,2; Xia, Jia-Shuai3; Chen, You-Peng1,2; Liu, Zhi-Ping3; Guo, Jin-Song1,2; Shen, Yu1,2; Zhang, Cheng-Cheng3; Wang, Jing4
2017-05-01
摘要Extracellular polymeric substances (EPS) play a crucial role in heavy metal bio-adsorption using activated sludge, but the interaction mechanism between heavy metals and EPS remains unclear. Isothermal titration calorimetry was employed to illuminate the mechanism in this study. The results indicate that binding between heavy metals and EPS is spontaneous and driven mainly by enthalpy change. Extracellular proteins in EPS are major participants in the binding process. Environmental conditions have significant impact on the adsorption performance. Divalent and trivalent cations severely impeded the binding of heavy metal ions to EPS. Electrostatic interaction mainly attributed to competition between divalent cations and heavy metal ions; trivalent cations directly competed with heavy metal ions for EPS binding sites. Trivalent cations were more competitive than divalent cations for heavy metal ion binding because they formed complexing bonds. This study facilitates a better understanding about the interaction between heavy metals and EPS in wastewater treatment. (C) 2017 Elsevier Ltd. All rights reserved.
关键词Extracellular polymeric substances Heavy metals Isothermal titration calorimetry Biosorption
DOI10.1016/j.biortech.2017.02.067
发表期刊BIORESOURCE TECHNOLOGY
ISSN0960-8524
卷号232页码:354-363
通讯作者Chen, YP (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.
收录类别SCI
WOS记录号WOS:000400867100043
语种英语