title: Component analysis and heavy metal adsorption ability of extracellular polymeric substances (EPS) from sulfate reducing bacteria.
abstract: Extracellular polymeric substances (EPS) play an important role in the treatment of acid mine drainage (AMD) by sulfate-reducing bacteria (SRB). In this paper, Desulfovibrio desulfuricans was used as the test strain to explore the effect of heavy metals on the components and adsorption ability of EPS. Fourier-transform infrared (FTIR) spectroscopy analysis results showed that heavy metals did not influence the type of functional groups of EPS. Potentiometric titration results indicated that the acidic constants (pKa) of the EPS fell into three ranges of 3.5-4.0, 5.9-6.7, and 8.9-9.8. The adsorption site concentrations of the surface functional groups also increased. Adsorption results suggested that EPS had a specific binding affinity for the dosed heavy metal, and that EPS extracted from the Zn(2+)-dosed system had a higher binding affinity for all heavy metals. Additionally, Zn(2+) decreased the inhibitory effects of Cd(2+) and Cu(2+) on the SRB.
authors.affiliation: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
authors.forename: Zheng-Bo
authors.initials: ZB
authors.lastname: Yue
authors.affiliation: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
authors.affiliation: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
authors.forename: Chuan-chuan
authors.initials: CC
authors.lastname: Li
authors.affiliation: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
authors.forename: Tian-hu
authors.initials: TH
authors.lastname: Chen
authors.affiliation: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China. Electronic address: sophiawj@hfut.edu.cn.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
mesh_terms: D000143:Acids; D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D045285:Desulfovibrio desulfuricans / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011199:Potentiometry; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification; D015032:Zinc / Q000737:chemistry*
chemical_list: D000143:Acids; D019216:Metals, Heavy; D010710:Phosphates; D011108:Polymers; D013431:Sulfates; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002244:Carbon; D003300:Copper; D015032:Zinc
keywords: Adsorption; Extracellular polymeric substances; Heavy metal; Sulfate-reducing bacteria