本文提出一种基于三维电极电化学反应器处理有机废水的新技术 ,结果表明 :该反应器能有效地去除苯胺 ,但其去除率受外加电压、溶液中Fe2 +的浓度、pH值及处理时间 (t)的影响较大 .该项技术处理有机废水效果明显 ,主要是基于电致过氧化氢 ,在Fe2 +存在情况下迅速生成对有机物有很强氧化作用的羟基自由基 .通过ESR法测出了在该电化学反应器处理废水过程中产生的羟基自由基
The electrochemical degradation of aniline was investigated using a novel electrochemical reactor, three_dimensional electrode reactor. The experimental results indicated that the reactor could efficiently remove aniline. The removal efficiency could be attributed to a combination of direct and indirect electrochemical reactions,that is,anodic oxidation and oxidation of electrogenerated H 2O 2 and hydroxyl radicals generated in electro_Fenton process. It was also observed that the removal efficiency was significantly dependent on applied voltage,Fe 2+ concentration,pH value and electrolysis time. In the experimental range they all have a positive effect on the removal efficiency except for pH value. Furthermore,hydroxyl radicals generated in electro_Fenton process was confirmed whith the method of spin_trapping ESR.
[1] HuangCP ,DongCG ,TangZH .Advancedchemicaloxidation:itspresentroleandpotentialfutureinhaz ardouswastetreatment[J].WasteManagement,1993,13:361.
[2] HsiaoYL ,NobeK .Hydroxylationofchlorobenzeneandphenolinapackedbedflowreactorwithelectrogen eratedFenton’sreagent[J].J .Appl.Electrochem.,1993,23:943.
[3] TomatR .ElectrochemicaloxiationoftoluenepromotedbyOHradicals[J].J.Appl.Electrochem,1984,14(1):1.
[4] OturanMA .Anecologicallyeffectivewatertreatmenttechniqueusingelectrochemicallygeneratedhydroxylradicalsforinsitudestructionoforganicpollutants:Applicationtoherbicide2,4_D [J].J .Appl.Electrochem.,2000,30(4):475
[5] BrillasE ,CalpeJC ,CasadoJ .Mineralizationof2,4_Dbyadvancedelectrochemicaloxidationprocesses[J].WaterRes.,2000,34(8):2253.
[6] PletcherD ,WeinbergNL .Thegreenpotentialofelectrochemistry,Part1:thefundamentals[J].Chem.Eng.,1992,8:98;Part2:theapplications[J].Chem.Eng.,1992,11:132.
[7] RajeshwarK ,IbanezJG ,SwainGM .Electrochemistryandenvironment[J].J .Appl.Electrochem.,1994,24:1077.
[8] BelmantC ,CognetP ,BerlanJ,etal.Applicationofanelectrochemicalpulsedflowreactortoelectroorganicsynthesis:Part1.Reductionofacetophenone[J].J.Appl.Electrochem.,1998,28:185.
[9] OgataY ,TomizawaK ,TakagiK .Photooxidationofformic,acetic,andpropionicacidswithaqueoushydrogenperoxide[J].Can.J .Chem.,1981,59:14.
[10] SimonssonD .Electrochemistryforacleanerenvironment[J].Chem.Soc.Rev.,1997,26(3):181.
[11] SzantoD ,TrinidadP ,WalshF .Evaluationofcarbonelectrodeandelectrosynthesisofcoumestanandcate cholaminederivativesintheFM01_LCelectrolyzer[J].J .Appl.Electrochem.,1998,28:251.
[12] DidckmannGR ,Langer,SH .Selectiveelectrogenerativeoxidationofbenzylalcoholwithplatinum_graphitepacked_bedanodes[J].J.Appl.Electrochem.,1997,27:1.
[13] BisangJM .Electrochemicaltreatmentofwastesolutioncontainingferroussulfatebyanodicoxidationusinganundividedreactor[J].J.Appl.Electrochem.,2000,30:399.
[14] GrauJM ,BisangJM .Cadmiumremovalfromaqueoussulfatesolutionsbytreatmentwithironfelts[J].J .Chem.Technol.Biotechnol,1998,73:398.
[15] El_DeabMS ,SalehMM ,El_AnodouliBE ,etal.Electrochemicalremovalofleadionsfromflowingelec trolytesusingpackedbedelectrodes[J].J .Electrochem.Soc.1999,146:208.
[16] RagniniCAR ,DiIRA ,BizzoWetal.Recycledniobiumfeltasanefficientthree_dimensionalelectrodeforelectrolyticmetalionremoval[J].WaterRes,2000,34:3269.
[17] WalshF ,ReadeG .Designandperformanceofelectrochemicalreactorsforefficientsynthesisandenvironmen taltreatment.Part2.Typicalreactorsandtheirperformance[J].Analyst,1994,119:797.
