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时间:2020-03-27
《网状多级孔结构氧化铁的制备、合成机理及其光催化性质.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao12214ActaP.一C.Sin.2012,28(9),2214—2220September[Article】doi:10.3866/PKU.WHXB201206122www.whxb.pku.edu.ca网状多级孔结构氧化铁的制备、合成机理及其光催化性质范海滨张东凤郭林(北京航空航天大学化学与环境学院,北京100191)摘要:以九水合硝酸铁为原料,利用改进的聚合诱导胶体聚集(PICA)的方法制备出三维网络状多级孔结构氧化铁(HPH).此结构的制备关键是在合成过程中尿素和甲醛聚合生成脲醛树脂(UF).脲醛树脂一
2、方面在铁的羟基氧化物生长过程中与之杂化形成杂化产物Fe-UF,另一方面则进一步聚合。形成脲醛树脂微球(UFM).脲醛树脂微球作为模板诱导杂化产物Fe-UF在其表面的聚集.微球与微球之间则由于表面存在的脲醛树脂间的聚合会相互交联形成网络状结构.经过煅烧处理后。脲醛树脂及脲醛树脂微球的分解导致不同尺寸孔结构的生成.光催化研究结果表明,产物对罗丹明B的降解效率是商用纳米氧化铁的4倍.关键词:a—FeO。:多级孔结构:聚合诱导胶体聚集法:光催化降解中图分类号:0648Fabrication,FormationMechanismandthePhOtOCataIytic
3、PropertiesofHierarchicaIPorousHematiteNetworksFANHal-BinZHANGDong—FengGUOLin(SchoolofChemistryandEnvironment,BeihangUniversity,Beijing100191,R.China)Abstract:HierarchicaIporoushematite(HPH)networkstructuresweresuccessfuIlyconstructedusinganimprovedpolymerizationinducedcolloidaggreg
4、ationprocesswithFe(NO3)3·9H20astherawmateria1.Thepolymerizationbetweenureaandformaldehydeintourea—formaldehyde(UF)resiniSthekeyfaclorf0rthisconstruction.TheUFresinsappeartobeadvantageOusintworespects:theUFoligomerhybridswithferrichydroxide(Fe-UF)andUFpolymerformedmicrocapsules(UFM)
5、actedastemplatestoinducetheaggregationofFe-UFhybridsintomesoporousspheres.Thefurthercrosslinkreactionsamongthehybridspheresgeneratethenetworkstructure。Aftercalcination。thedecompositionoftheUFresinandtheUFMproducesnanoporesinthenanorodsubunitsandmacroporesinthenetworkstructure.respe
6、ctively.ThephotodegradationactivityoftheuniquestructuredHPHiSfourtimesthatofthecommerciaIhematitenanopa~icleswithrhodamineB(RhB)aspollutant.KeyWords:a—Fe203;Hierarchicalporousstructure;Polymerizationinducedcolloidaggregationmethod;Photodegradation1IntrOductiOnthelargespecificsurfac
7、earcaofmesoporousmaterialsandHierarchicalporousmaterials(HPM),withinterconnectedthehigheficiencyofmasstransportofmacroporousones一poresofmultiplelengthscalesasthestructurecharacter,havemakethehierarchicalporousmaterialsaspromisingcandi—attractedspecialresearchinterest.Thecombinedadv
8、antagesofdatesespeciallyin
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