Competitive adsorption of heavy metal by extracellular polymeric substances (EPS) extracted from sulfate reducing bacteria.
Competitive adsorption of heavy metals by extracellular polymeric substances (EPS) extracted from Desulfovibrio desulfuricans was investigated. Chemical analysis showed that different EPS compositions had different capacities for the adsorption of heavy metals which was investigated using Cu(2+) and Zn(2+). Batch adsorption tests indicated that EPS had a higher combined ability with Zn(2+) than Cu(2+). This was confirmed and explained by Fourier transform infrared (FTIR) and excitation-emission matrix (EEM) spectroscopy analysis. FTIR analysis showed that both polysaccharides and protein combined with Zn(2+) while only protein combined with Cu(2+). EEM spectra further revealed that tryptophan-like substances were the main compositions reacted with the heavy metals. Moreover, Zn(2+) had a higher fluorescence quenching ability than Cu(2+).
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Jin
J
Wang
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Qing
Q
Li
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Ming-Ming
MM
Li
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Tian-Hu
TH
Chen
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Yue-Fei
YF
Zhou
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China. Electronic address: zbyue@hfut.edu.cn.
Zheng-Bo
ZB
Yue
D000327:Adsorption; D045285:Desulfovibrio desulfuricans / Q000378:metabolism*; D019216:Metals, Heavy / Q000302:isolation & purification / Q000378:metabolism*; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000378:metabolism*
D019216:Metals, Heavy; D011108:Polymers; D013431:Sulfates
Competitive adsorption; Extracellular polymeric substance; Heavy metal; Sulfate-reducing bacteria