磷酸活化法活性炭性质对亚甲基蓝吸附能力的影响

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:(30671651,30972317):(1968-),,,,,;E2mail:[e-mail]2lin1,2,1,1(1.,210037;2.;;;,210042):3,4,Boehm,:,,,;,,,,,;,,:;;;:TQ424:A:0253-2417(2010)04-0001-06EffectsofthePropertiesofPhosphoricAcid2activatedCarbononAdsorptionCapacityofMethyleneBlueZUOSong2lin1,LIUJun2li2,YANGJian2xiao1,CAIXuan1(1.CollegeofChemicalEngineering,NanjingForestryUniversity,Nanjing210037,China;2.InstituteofChemicalIndustryofForestProducts,CAF;NationalEngineeringLab.forBiomassChemicalUtilization;KeyandOpenLab.onForestChemicalEngineering,SFA;KeyLab.ofBiomassEnergyandMaterial,JiangsuProvince,Nanjing210042,China)Abstract:ActivatedcarbonsofChinafir(Cunninghamialanceolata)woodoriginwerepreparedfromphosphoricacidactivationinatmospheresofair,nitrogenandsteamrespectively,andtheeffectsofthepropertiesofactivatedcarbonontheadsorptioncapacityofmethylenebluewereinvestigated.Poroustextureofactivatedcarbonwasanalyzedbasedonthenitrogenadsorptionisotherms.SurfacefunctionalgroupsweredeterminedbytheBoehmmethod,andtheadsorptionisothermsofmethyleneblueontheactivatedcarbonsweremeasured.Theresultsshowthatactivatedcarbonwithmoredevelopedporosityhashigheradsorptioncapacityofmethyleneblue.Surfacefunctionalgroupsonactivatedcarbons,especiallystrongacidgroups,playtworolesinadsorbingmethyleneblue.Surfacefunctionalgroupsfacilitatethearrangementofmethylenebluemoleculesatamorecompactwayonactivatedcarbonandthusproduceapositiveeffectontheadsorptionofmethyleneblue.Ontheotherhand,theycanscreentosomedegreepartsofporesthatareoriginallyaccessibletomethylenebluemoleculesandthussuppresstheadsorption.Consequently,anincreasedconcentrationofsurfacefunctionalgroupsmayproduceanincreaseintheadsorptioncapacityofmethylenebluefortheactivatedcarbonwithdevelopedmesoporesbecausetheformerrolepredominates,onthecontrary,adecreaseforthemicroporousactivatedcarbonbecausethelatterrolepredominates.Keywords:phosphoricacid;activatedcarbon;methyleneblue;adsorption©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[1-2],[3-4],Wang[5],,(450500),,[6],(),[7-8],,11.10.451.0mm(CHOP52.7%7.0%40.0%0.01%),,31(),5/min,475,,,:100mL/min,4751hA1-PC,2hA2-PC;100mL/min,4751hN-PC;100mL/min,4751hS-PC1.2CHCHN-O-Rapid(Heraeus),POCH[6],Boehm[8]:43,(0.20.0001)g,50mL0.1mol/L0.05mol/L0.1mol/L,150r/min24h,,10mL,20mL0.1mol/L,0.1mol/L[9],,,,(H+,mmol/g)ASAP2020(Micromeritics),2504h,Brunauer-EmmetTeller(BET)(SBET);0.95(Vtot);Dubinin-Radushkevic(Vmic);(Vmes)1.30.2g0.0001g,50mL(5002800mg/L),150r/min2h(),UV-2100S(),650nm3,(1)Q=(c0-ce)Vm(1)©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:3:Q,mg/g;c0,mg/L;ce,mg/L;V,L;m,gLangmuir(2)ceqe=1qmaxKL+ceqmax(2):ce,mg/L;qe,mg/g;qmax,mg/g;KL(2),(1.2nm2)[10],(SMB)22.111,,(1),[11];,,,A2-PCA1-PC(1),,,S-PC3(2),[12],,,,,,,,COP,,;,,(1)2,,,1Table1Resultsofelementanalysisandtheyieldsoftheactivatedcarbonsamples%1)samplesyieldCPHOashA1-PC40.973.772.272.1816.185.6A2-PC34.769.132.872.5219.086.4N-PC44.576.52.132.8413.235.3S-PC48.484.50.783.029.942.31)A1-PC1hmadeinair,activatedfor1h;A2-PC,2hmadeinair,activatedfor2h;N-PCN2madeinN2;S-PCN2,1hmadeinN2andsaturatedsteam,activatedfor1h;2sameasinTable2.2Table2Concentrationofdifferentsurfacefunctionalgroupsinactivatedcarbons(mmol/g)samplestotalgroupsstrongacidgroupsintermediateacidgroupsweakacidgroupsA1-PC4.5472.6221.1280.797A2-PC5.0242.9541.2870.783N-PC2.9321.2861.010.638S-PC1.9540.5130.5840.857©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[13],,,[12]3,,;3Table3Porecharacteristicparametersofactivatedcarbonspreparedindifferentatmospheressamples/(m2g-1)SBET/(cm3g-1)Vtot/(cm3g-1)Vmic/(cm3g-1)VmesVmes/Vtot/%SMB/(m2g-1)SMB/SBET/%A1-PC16231.6840.5721.11256.4120874.4A2-PC13761.2250.4650.76067.0107377.9N-PC15101.5960.5031.09364.296664.0S-PC18751.8770.5151.36272.687846.82Fig.2Adsorptionisothermsofmethyleneblueonphosphoricacid2activatedcarbons2.3422,S-PCSBETVmicVmes3,,S-PC3,A2-PCN-PCA2-PCN-PC,N-PCA2-PC,,,,,,,©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:5()[4]COP,,,,(2)pH[1-2,14]3,SMB/SBET,,SMB/SBET,,,;,,[3],,S-PCSMB/SBET3,A2-PCSMB/SBETA1-PC,,,(Vmes0.30.4cm3/g),Vmes,,,,,,,[4],(SBET735m2/g;Vmic0.32cm3/g,Vmes0.088cm3/g),(GB/T12496.10-1999),150120mg/g,,,A1-PCA2-PC,A2-PCA1-PC(2),A1-PCA2-PC(3)Ahmad[14],SBET,,,,,,,,,;,;,3,,,,,,,,,;,,©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[1]KARAG;ZS,TAYT,UCARS,etal.Activatedcarbonsfromwastebiomassbysulfuricacidactivationandtheiruseonmethyleneblueadsorp2tion[J].BioresourceTechnology,2008,99(14):6214-6222.[2]KARACAS,GCRSEA,ACIKYILDIZM,etal.Adsorptionofcationicdyefromaqueoussolutionsby