摘要
The interactively interfacial reactions between the iron-reducing bacterium (Shewanella decolorationis, S12) and iron oxide (α-FeOOH) were investigated to determine reductive dechlorination transformation of chlorinated organic compounds (chloroform and pentachlorophenol). The results showed that the interactive system of S12+ α-FeOOH exhibited relatively high dechlorination rate. By comparison, the S12 biotic system alone had no obvious dechlorination, and the α-FeOOH abiotic system showed low dechlorination rate. The enhanced dechlorination of chloroform and pentachlorophenol in the interactive system of S12+α-FeOOH was derived from the promoted generation of adsorbed Fe(Ⅱ) by S12. A decrease in redox potential of the Fe(Ⅲ)/Fe(Ⅱ) couple in the interactive reaction system was determined by cyclic voltammetry. Our results will give new insight into interactively interfacial reaction between iron-reducing bacterium and iron oxides for degradation of chlorinated organic compounds under anaerobic condition.
The interactively interfacial reactions between the iron-reducing bacterium （Shewanella decolorationis, S12） and iron oxide （α-FeOOH） were investigated to determine reductive dechlorination transformation of chlorinated organic compounds （chloroform and pentachlorophenol）. The results showed that the interactive system of S12＋ α-FeOOH exhibited relatively high dechlorination rate. By comparison, the S12 biotic system alone had no obvious dechlorination, and the α-FeOOH abiotic system showed low dechlorination rate. The enhanced dechlorination of chloroform and pentachlorophenol in the interactive system of S12＋α-FeOOH was derived from the promoted generation of adsorbed Fe（Ⅱ） by S12. A decrease in redox potential of the Fe （Ⅲ）/Fe （Ⅱ） couple in the interactive reaction system was determined by cyclic voltammetry. Our results will give new insight into interactively interfacial reaction between iron-reducing bacterium and iron oxides for degradation of chlorinated organic compounds under anaerobic condition.
基金
Supported by the National Natural Science Foundation of China (Grant Nos. 40601043 and 40771105)
关键词
有机氯化合物
还原脱氯
界面反应
针铁矿
交互式
铁细菌
FEOOH
生物系统
interactive reaction, reductive dechlorination, Shewanella decolorationis S12, goethite, chloroform, pentachlorophenol
