Chlorobenzene removal by electro-heterogeneous catalysis in aqueous solution:intermediates and reaction mechanism
This study was performed to investigate the variables that influence the removal efficiency of chlorobenzene(CB)in aqueous solution by electro-heterogeneous catalysis.The effect of current density,pH conditions and electrolyte concentration on CB removal efficiency were determined.The maximum degradation was observed with an initial chlorobenzene concentration of 50 mg/L.Current density 15 mA/cm2,initial pH 10,electrolyte concentration 0.1 m01/L,temperature 25℃at 90 min.The removal efficiency of TOC was slower than that Of CB.The maximum TOC removal efficiency was detected under the sariie conditions but at 120 min.Under the above conditions.The removal efficiency of 100％and 51％were achieved after 90 min respectively by electro-heterogeneous catalysis and electrochemical process,which showed that electro-heterogeneous catalysis is more efficient than electrochemical(EC)alone.From the Purge-and-Trap chromatography-mass spectrometry(P&T/GC/MS)and ion chromatograph(IC)results,we presume that in the reaction process,the initial·OH attack can occur at the C-Cl bond of CB.yielding phenol and biphenyi with the release of CT.Further oxidation of phenol and biphenyl produced PVinylbenzoic acid and hydroquin01.Finally,the compounds were oxidized to butenedioic acid and other small molecule acid.But only phenol,benzoquinone,butenedioic acid were detected by electrochemical process.
electro-heterogeneous catalysis chlorobenzene intermediate
WANG Jia-de MEI Yu LIU Chen-liang CHEN Jian-meng
College of Biological and Environmental Engineering,Zhejiang University of Technology,Hangzhou 310032,CHINA
国际会议
西安
英文
567-572
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）