Competitive adsorption of heavy metal by extracellular polymeric substances (EPS) extracted from sulfate reducing bacteria.
Competitive adsorption of heavy metal by extracellular polymeric substances (EPS) extracted from sulfate reducing bacteria.
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DOI：
10.1016/j.biortech.2014.04.073
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发表时间：
2014-07
影响因子：
11.4
通讯作者：
Jin Wang;Qing Li;Ming-ming Li;Tian-hu Chen;Yuefei Zhou;Zhengbo Yue
中科院分区：
文献类型：
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作者：
Jin Wang;Qing Li;Ming-ming Li;Tian-hu Chen;Yuefei Zhou;Zhengbo Yue
研究了脱硫脱硫弧菌胞外聚合物（EPS）对重金属的竞争吸附。化学分析表明，不同EPS组分对重金属的吸附能力不同，以Cu 2+和Zn 2+为吸附剂进行了研究。静态吸附实验表明，EPS对Zn ~（2+）的吸附能力强于Cu ~（2+）。这是证实和解释的傅里叶变换红外（FTIR）和激发-发射矩阵（EEM）光谱分析。红外光谱分析表明，多糖和蛋白质均与Zn 2+结合，只有蛋白质与Cu 2+结合。EEM谱进一步揭示了与重金属反应的主要成分为类罗汉物质。Zn ~（2+）的荧光猝灭能力强于Cu ~（2+）。
Competitive adsorption of heavy metals by extracellular polymeric substances (EPS) extracted fromDesulfovibrio desulfuricanswas investigated. Chemical analysis showed that different EPS compositions had different capacities for the adsorption of heavy metals which was investigated using Cu2+and Zn2+. Batch adsorption tests indicated that EPS had a higher combined ability with Zn2+than Cu2+. 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 Zn2+while only protein combined with Cu2+. EEM spectra further revealed that tryptophan-like substances were the main compositions reacted with the heavy metals. Moreover, Zn2+had a higher fluorescence quenching ability than Cu2+.