电渗析法再生CO2电还原电解液的研究张龙龙

　　　201129CO2张龙龙　李　军(,056027)　:探索了电渗析法再生CO2电还原电解液的可行性。以HCOOK溶液作为CO2电还原反应后的模拟液,采用单室电渗析装置对其进行再生,考察了电流、时间、温度等操作条件对电流效率和再生率的影响,研究结果表明:在常温条件下,操作电流低于极限电流时,采用电渗析法再生CO2电还原电解液具有高的电流效率和再生率。:电渗析;CO2电还原;电解液RECOVERINGTHEELECTROLYTEOFELECTROCHEMICALREDUCTIONOFCO2WITHELECTRODIALYSISZhangLonglong　LiJun(The718thResearchInstituteofCSIC,Handan056027,China)Abstract:AnelectrodialysisreactorisemployedtorecoverytheelectrolyteofelectrochemicalreductionofCO2.Theeffectofcurrent,time,temperatureontheelectrodialysisprocesswasstudied.Itisconcludedthatatnormaltemperaturehighelectriccurrentcoefficientandrecoveryratecouldbeobtainedwhenthecurrentwaslessthanlimitingcurrent.Keywords:electrodialysis;electrochemicalreductionofCO2;electrolyte0　,,,CO2,,CO2。CO2CO2,,CO2,。,CO2、、[1-2]。,CO2[3],KOHCO2,CO2,OH-HCOO-,HCOOK,KOH,CO2,KOH。,[4]、[5]、[6],CO2KOH,HCOOKCO2,CO2。1　1.1　再生原理,,,HCOOK,,::2H2O-4e※4H++O2:3H2O+4e※4OH-+H2,H+HCOO-,K+,OH-KOH,KOH。1.2　实验装置及步骤2,、、、,,,、、、、、,,,,,43cm2,,364DOI:10.13205/j.hjgc.2011.s1.105　　　201129。1　2　,1HCOOK,2,,,,0.5h2KOH,2,,KOH。1.3　数据处理,。(1):η=×100%=VFΔcIt×100%(1)　V———2;　　■c———2K+;　F———;　I———;　t———。K+K+,(2):φ=K+K+=VtctVc(2)　V,c———,K+;　　Vt,ct———,K+。2　2.1　技术可行性0.2,0.6,1.2mol/LHCOOK,CO2,1。1　CO2HCOOK/(mol·L-1)HCOOK/L/hmA/cm2/%/%0.20.51.5409391.50.2124088.479.50.60.52.56089.1811.20.531008475　　1,KOH,,,HCOO-,HCOO-。2.2　操作电流密度的选择500mL、60L/h,20℃,(HCOOK)0.2,0.4,0.6mol/L,2h,,3-4。3　4　3,,365　　　201129,,,K+,;,,,;,,,,,,,,,,,。4,,,,,。2.3　操作时间的选择500mL、60L/h,20℃,0.2,0.4,0.6mol/L,60mA/cm2,(5、6)。5　6　5,,,,,,H+,H+K+,H+K+,。,100%,,K+,K+,。K+K+,,K+,。6,,,,。7,,,,,,,,K+,;,K+,HCOOKHCOOH,pKa3.77,HCOOK,,,。,,。7　2.4　操作温度的选择500mL、60L/h,0.2,0.4,0.6mol/L,60mA/cm2,1h,。89,,,,,,,366　　　2011298　9　。,,,,。3　CO2,、、。,,,。,。,。[1],,,.GCCO2[J].,2005(3):45-47.[2],,,.KOH/PbCO2[J].,2006(6):957-962.[3],.[J].,2003,61(5):666-670.[4],,.[J].(),2008,31(3):283-286.[5]ZhangNi,PengShuchuan,HuangChuan,etal.Simultaneousre-generationofformicacidandcarbonicacidfromoxalatedischargebyusingelectrodialysiswithbipolarmembranes(EDBM)[J].Journalofmembranescience,2008(12):56-63.[6]LuoGS,PanS,LiuJG.Useoftheelectrodialysisprocesstocon-centrateaformicacidsolution[J].Desalination,2002(6):227-234.　　056027　　E-mail　[e-mail]2011-02-14(359)。。2.4　加强对处置企业固废的监管《》,,,。[1].[J].,2006,19(5):44-46.[2],,.[J].,2004,33(6):27-30.[3],,,.[J].,2008,28(2):132-135.[4],,,.[J].,2008,31(1):51-55.[5],,,.[J].,2006,34(10):59-62.[6],.[P].2005,CN200510023787.4.[7],,,.[J].,2000,13(3):57-60.[8],,,.[J].,2005,14(1):66-69.　　　213001　1801　E-mail　[e-mail]2011-01-19367