%0 Journal Article
%T Electron Shuttling Function of Dissolved Organic Matter<br>水溶性有机物的电子穿梭功能研究
%A XU Wei
%A HU Pei
%A ZHOU Shun-gui
%A LI Xiao-min
%A LI Yan-hong
%A <br>许伟
%A 胡佩
%A 周顺桂
%A 李晓敏
%A 李艳红
%J 环境科学
%D 2009
%I 
%X The redox reactive and electron shuttling function of dissolved organic matter (DOM) derived from sewage sludge were studied with Shewanella cinica D14~T as driving force of electron transfer. The results indicated that sludge DOM initially served as terminal electron acceptor obtaining electrons from the respiratory chain of quinone-reducing bacteria D14~T , then it translated to reduced DOM which can donate electrons to Fe(Ⅲ) again. The electron donating capacities (EDC) of DOM increased from initial capacity of 2.2-14 μmol·g~(-1) to 253-347 μmol·g~(-1) after DOM was reduced by D14~T . The cyclic voltammetry measurements and multiple reduction-oxidation cycles experiments of DOM showed that two pairs of redox peaks were clearly observed and the EDC remained at a level of 150-250 μmol·g~(-1) after three reduction-oxidation cycles, indicating that DOM can be recyclably used for electron transfer. In the system of hydrous ferric oxide (HFO) reduction by S. cinica D14~T , the reductive dissolution speed was improved with the presence of DOM, since that DOM was capable of acting as an electron shuttle between S. cinica D14~T and HFO. These results demonstrate the important role of DOM in electron transfer process, and bring out a new perspective about the functions of DOM in the environment.
%K dissolved organic matter(DOM)
%K Shewanella cinica D14~T
%K redox reactive
%K electron shuttling function<br>水溶性有机物
%K 中国希瓦氏菌D14T
%K 氧化还原性
%K 电子穿梭功能
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=6D650B5B3B846613692ADEF5F8297B96&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=5D311CA918CA9A03&sid=FE285F37AA3F3B9D&eid=6E66AAEF44D63139&journal_id=0250-3301&journal_name=环境科学&referenced_num=1&reference_num=23