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Enhancement of Oxygen Mass Transfer Using Functionalized Magnetic Nanoparticles
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2018-08-31 10:11 450閱讀次數(shù)
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Oxygen-transferenhancementhasbeenobservedinthepresenceofcolloidaldispersionsofmagnetite(Fe3O4)nanoparticlescoatedwitholeicacidandapolymerizablesurfactant.Thesefluidsimprovegas-liquidoxygenmasstransferupto6-fold(600%)atnanoparticlevolumefractionsbelow1%inanagitated,spargedreactorandshowremarkablestabilityinhigh-ionicstrengthmediaoverawidepHrange.Throughacombinationofexperimentsusingphysicalandchemicalmethodstocharacterizemasstransfer,itisshownthat(i)boththemasstransfercoefficient(kL)andthegas-liquidinterfacialarea(a)areenhancedinthepresenceofnanoparticles,thelatteraccountingforalargefractionofthetotalenhancement(80%ormore),(ii)theenhancementinkLmeasuredbyphysicalandchemicalmethodsissimilarandrangesfrom20to60%approximately,(iii)theenhancementinkLlevelsoffatananoparticlevolumefractionofapproximately1%v/v,and(iv)theenhancementinkLashowsastrongtemperaturedependence.Theseresultsarerelevanttoawiderangeofprocesseslimitedbythemasstransferofasolutebetweenagasphaseandaliquidphase,suchasfermentation,wastetreatment,andhydrogenationreactions.
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Enhancement of Oxygen Mass Transfer Using Functionalized Magnetic Nanoparticles Oxygen-transferenhancementhasbeenobservedinthepresenceofcolloidaldispersionsofmagnetite(Fe3O4)nanoparticlescoatedwitholeicacidandapolymerizablesurfactant.Thesefluidsimprovegas-liquidoxygenmasstransferupto6-fold(600%)atnanoparticlevolumefractionsbelow1%inanagitated,spargedreactorandshowremarkablestabilityinhigh-ionicstrengthmediaoverawidepHrange.Throughacombinationofexperimentsusingphysicalandchemicalmethodstocharacterizemasstransfer,itisshownthat(i)boththemasstransfercoefficient(kL)andthegas-liquidinterfacialarea(a)areenhancedinthepresenceofnanoparticles,thelatteraccountingforalargefractionofthetotalenhancement(80%ormore),(ii)theenhancementinkLmeasuredbyphysicalandchemicalmethodsissimilarandrangesfrom20to60%approximately,(iii)theenhancementinkLlevelsoffatananoparticlevolumefractionofapproximately1%v/v,and(iv)theenhancementinkLashowsastrongtemperaturedependence.Theseresultsarerelevanttoawiderangeofprocesseslimitedbythemasstransferofasolutebetweenagasphaseandaliquidphase,suchasfermentation,wastetreatment,andhydrogenationreactions.[詳細(xì)]
2018-08-31 10:11
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Enhancement of Oxygen Mass Transfer Using Functionalized Magnetic Nanoparticles
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