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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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CatalyticpropertiesofnanosizedzincaluminatespreparedbygreenprocessusingOpuntiadileniihawplantextract
DOI: 10.1016/S1872-2067(12)60682-2, PP. 1951-1958
Keywords: Greensynthesis,Zincaluminate,Spinel,Microwave,Opticalproperty
Abstract:
？Variousnanosizedzincaluminate(ZnAl2O4)sampleswerepreparedbyaconventionalandamicrowavemethodbothwithandwithoutusingOpuntiadileniihawplantextract,andwerecharacterizedbyX-raydiffraction(XRD),Fouriertransforminfraredspectroscopy(FT-IR),highresolutionscanningelectronmicroscopy(HRSEM),energydispersionscanning(EDX),temperaturedependentconductancemeasurements,thermoelectricpowermeasurements,ultraviolet-visible(UV-Vis)diffusereflectancespectroscopy,andphotoluminescencespectroscopy.TheformationofapureZnAl2O4phasewasconfirmedbyXRDandFT-IR.Achangeinmorphologyfromnanosizedplatestonanosizedsheetswith,respectively,theconventionalandmicrowaveheatingmethodswasclearlyshownbyHRSEM.UV-VisdiffusionreflectancespectroscopymeasuredthebandgapsofZnAl2O4nanosizedplatesandnanosizedsheetsas3.5and3.9eV,respectively.ThesynthesizedZnAl2O4wassinglecrystallineandhasthreephotoluminescenceemissionsat482,528,and540nm.ZnAl2O4nanosizedsheetspreparedbythemicrowavemethodshowedhighercatalyticactivityfortheoxidationofbenzylalcohol(85%conversion)thanZnAl2O4nanosizedplatespreparedbytheconventionalmethod(60%conversion).
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