摘要
MacroscopicSiO_2sphereswithahomogeneousaminedistributionweresynthesizedbyaone-stepemulsionbasedsynthesisapproachinaflowcolumnreactor.TheCO_2adsorptioncapacityofthenanostructuredamine-functionalizedsilicasphereswasstudiedinabsenceandpresenceofH_2O.Thestructuralpropertieswereadjustedbyvaryingsolventsandsurfactantsduringthesynthesisand,atconstantamineloadings,werefoundtobethemainfactorforinfluencingtheCO_2sorptioncapacities.Underwater-freeconditionsCO_2isboundtotheaminogroupsviatheformationofcarbamates,whichrequiretwoneighboringaminogroupstoadsorboneCO_2molecule.Atconstantamineconcentrationssorbentswithlowersurfaceareaallowtoestablishahigheraminedensityonthesurface,whichenhancestheCO_2uptakecapacitiesunderdryconditions.InpresenceofH_2OtheCO_2adsorptionchangesto1:1stoichiometryduetostabilizationofcarbamatesbyprotonationofH_2Oandformationoffurtherspeciessuchasbicarbonates,whichshouldinprincipledoubletheadsorptioncapacities.LowconcentrationsofphysisorbedH2O(0.3mmol/g)didnotimpairtheadsorptioncapacityoftheadsorbentsforCO_2,whileathigherwateruptakes(0.6and1.1mmol/g)theCO_2uptakeisreduced,whichcouldbeattributedtocapillarycondensationofH_2Oorformationofbulkyreactionproductsblockinginnerporesandaccesstoactivesites.
出版日期
2016年02月12日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
