低温等离子体处理次甲基蓝染料废水实验李善评

32220132实验室研究与探索RESEARCHANDEXPLORATIONINLABORATORYVol．32No．2Feb．2013李善评1，姜艳艳1，阴文杰1，曹小红1，崔江杰2，曾雪缘11．2501002．300051:为了研究介质阻挡放电产生的低温等离子体对次甲基蓝(C16H18ClN3S·3H2O)染料废水的脱色效果和机理，反应器采用中心进水、周边出水的辐流式沉淀池结构。实验研究了不同初始浓度、不同放电功率及外界因素如Fe2+、Na2CO3等对次甲基蓝染料废水降解效果的影响。结果表明，低温等离子体对次甲基蓝染料有着较好的处理效果。提高放电功率能够有效地提高次甲基蓝的降解率，考虑到电极和能量损耗，介质阻挡放电最佳条件:放电功率150W，初始浓度50mg/L，降解处理120min时，次甲基蓝脱色率达到98%以上;加入10mg/LFe2+，80min时，次甲基蓝染料的脱色率达到98%，但是当添加量过高时，会在一定程度上抑制其降解;添加Na2CO3作为自由基俘获剂则抑制了次甲基蓝染料的降解，表明·OH是反应过程中降解次甲基蓝的主要活性物质。:低温等离子体;介质阻挡放电;次甲基蓝;染料;废水处理X703．1A1006－7167201302－0017－04DegradationofMethyleneBlueDyeWastewaterbyLow-temperaturePlasmaLIShan-ping1JIANGYan-yan1YINWen-jie1CAOXiao-hong1CUIJiang-jie2ZENGXue-yuan11．SchoolofEnvironmentalScienceandEngineeringShandongUniversityJinan250100China2．TianjinMunicipalEngineeringDesignResearchInstituteTianjin300051ChinaAbstractInordertostudythenewtechnologyofplasmaonwastewatertreatmentthedegradationbehaviorofmethylenebluedyewastewaterwasinvestigatedinthelow-temperatureplasmaformedduringthedielectricbarrierdischargeDBDprocess．Thereactorwastheradialflowsedimentationtankstructurewhichwascenteredonthewaterinlet．ThedifferentinitialconcentrationsdifferentinputpowersandtheeffectsofdifferentexternalfactorssuchasFe2+Na2CO3onmethylenebluedyewastewaterdegradationwerestudied．Theresultsshowedthatmethylenebluedyecouldbeeffectivelyremovedfromaqueoussolutionbythelow-temperatureplasma．Increasingtheinputpowercouldincreasethedegradationefficiency．Consideringtheservicelifeofelectrodeandenergyconsumption50mg/Lmethyleneblueandinputpowerof150Wwerechosenastheoptimumconditionsinwhichthedecolorationratewasupto98%at120mindischargetimewhenFe2+concentrationwas10mg/Lthedecolorationratewas98%at80minhowevertheyhinderedthedegradationathigherconcentrationsThepresenceofNa2CO3ashydroxideradicalscavengerdecreasedthedecolorationefficiencytosomeextentwhichshowedthathydroxylradicalsplayedanimportantroleinthedegradationprocess．Keywordslow-temperatureplasmadielectricbarrierdischargeDBDmethylenebluedyewastewatertreatment2012－04－272011GGE270481963－。[e-mail]0、、、实验室研究与探索321。。、、、2-3。、、4。、、5-8。FentonB910。。、。、、。。、。、。1－2－3－4－5－6－7－11、。12h=100mmR=50mm8mm142、。637。。2、2．1Methyleneblue98．5%Na2CO3。2．2CTP-2000KDS1062E-EDUBT00-100MTU1810PC-79-1。2．30．058g1000mL50mg/L。50mg/L。、、。8mm。120min20min。TU1810PC-666nm。ηη=C0－CtC0×100%ηComg/LCttmg/L。33．1150W50、812李善评，等:低温等离子体处理次甲基蓝染料废水实验100150mg/L120min20min。2。22。50、100150mg/L99．5%98．6%93．9%。。·OH。。50mg/L。3．2100、150200W350mg/L120min。20min。3。33。120min100150W98．7%99．5%。、、3·OH、·O11。3150200W120min99．5%99．6%150W。3．3Fe2+H2O2510Fe2+H2O2Fenton。FeSO4Fe2+。Fe2+205080mg/L。Fe2+150W120min20min。4Fe2+4Fe2+20mg/LFe2+·OH。·OH12H2O2+Fe2+→Fe3++·OH+OH－Fe2+40mg/LFe2+·OH13Fe2++·OH→Fe3++OH－·OH。3．4Na2CO31450mg/LNa2CO3。150W120min20min91实验室研究与探索32。Na2CO35。5Na2CO35Na2CO3Na2CO3。Na2CO3120min0、50150mg/L3Na2CO399．5%89．5%78．9%Na2CO3·OH·OH·OH。Na2CO3。Na2CO3。3．5、。O2H2OO2H2O·OH、·H、·O、O3。1510－7s16-17H2O→e·OH+eaq－+·H+H2O2+H3O+H2O·O315O2→e2·OH2→O2·OHO2+O·→O3。·OH18O3→O2+O·O·+H++e→·OHO3+H2O2→·OH+O2+HO2·O3+HO2·→·OH+O2+O2－H2O2、HO2。4。1。·OH。2150W50mg/L120min99．5%。3Fe2+。4Na2CO3·OH。References1．-J．200531266-68．2．J．200725297-101．3．J．2007196699-702．4ZalazarCSLabasMDBrandiRJetal．DichloroaceticaciddegradationemployinghydrogenperoxideandUVradiationJ．Chemosphere2007665808-815．5．J．200834975-87．6．J．2007245534-539．7．J．200733267-70．8．J．20082991124-1130．3402实验室研究与探索3214。、15。、、、、。、。3F-N-TiO2。。35℃45%400℃F/Ti0．10AO7。References1LiDHanedaHHishitaSetal．Visible-light-drivenN-F-codopedTiO2photocatalysts．1．synthesisbyspraypyrolysisandsurfacecharacterizationJ．ChemMater200517102588-2595．2LiDHanedaHHishitaSetal．Visible-light-drivenN-F-codopedTiO2photocatalysts．2．OpticalcharacterizationphotocatalysisandpotentialapplicationtoairpurificationJ．ChemMater200517102596-2602．3HuangDLiaoSLiuJetal．Preparationofvisible-lightresponsiveN-F-codopedTiO2photocatalystbyasol-gel-solvothermalmethodJ．PhotochemPhotobioAChem20061843282-288．4．M．2004．5DiValentinCFinazziEPacchioniGetal．DensityfunctionaltheoryandelectronparamagneticresonancestudyontheeffectofN-FcodopingofTiO2J．ChemMater200820113706-3714．6AsahiRMorikawaTOhwakiTetal．Visible-lightphotocatalysisinnitrogen-dopedtitaniumdioxideJ．Science20012935528269-271．7LindgrenTMwaboraJMAvendanoEetal．hotoelectrochemicalandopticalpropertiesofnitrogendopedtitaniumdioxidefilmspreparedbyreactiveDCmagnetronsputtering．J．PhysChemB2003107245709-5716．8YamakiTUmebayashiTSumitaTetal．Fluorine-dopingintitaniumdioxidebyionimplantationtechniqueJ．NuclInstruMethodsinPhysicsResearchB2003206254-258．9LiDHanedaHHishitaSetal．Visible-light-drivenN-F-codopedTiO2photocatalysts．2．OpticalcharacterizationphotocatalysisandpotentialapplicationtoairpurificationJ．ChemMater200517102596-2602．10YuJMYuJGHoWetal．EffectofF-dopingonthephotocatalyticactivityandmicrostructuresofnanocsystallineTiO2powdersJ．ChemMater20021493808-3816．11．NTiO2J．2006278697．12HuangDLiaoSLiuJetal．Preparationofvisible-lightresponsiveN-F-codopedTiO2photocatalystbyasol-gel-solvothermalmethodJ．PhotochemPhotobioAChem