Effect of humins from different sediments on microbial degradation of 2,2',4,4',5,5'-hexachlorobiphenyl (PCB153), and their polyphasic characterization

文献类型： 外文期刊

第一作者： Zhang, Dongdong

作者： Zhang, Dongdong;Zhang, Ning;Zhang, Chunfang;Yu, Xinwei;Zhang, Zhichao;Yang, Shengmao;Yang, Shengmao;Zhang, Chunfang

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期刊名称：RSC ADVANCES （ 影响因子：3.361； 五年影响因子：3.39 ）

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收录情况： SCI

摘要： This study was carried out to evaluate the activity of humins from four different sediments as electron mediators for microbial reductive dechlorination of 2,2',4,4',5,5'-hexachlorobiphenyl (PCB153) and to analyze the electron-mediating characteristics of humins. All the humins showed stable electronmediating activity in microbial dechlorination with the total removal of PCB153 in the range 0.19-0.32 mg L-1. Among the humins examined, that extracted from Qizhen Lake sediment, which was the richest in carbon (4.79%) and contained the highest concentration of Fe (11.04 mg g(-1) sample), showed the best performance. Fourier transform infrared analysis showed that all the humins exhibited similar spectra with varying absorbance intensity. A prominent band detected near 1635 cm(-1) indicated the presence of C=C and C=O bonds, which are generally considered to be associated with redox reactions. Cyclic voltammetry analysis confirmed the presence of redox-active moieties in all the humins, with the estimated redox potentials ranging from -0.4 to 0.3 V (versus a standard hydrogen electrode). The polyphasic characterization of humins and the observed stable microbial community composition regardless of humin origin indicated that microbial dechlorination activity is associated with multiple properties of humins, notably Fe content and the presence of C=O and C=C bonds and redox-active moieties.

分类号： O6

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