atio3afe co ni纳米微晶的制备和性能研究word格式论文.docxVIP

ABSTRCTTitania(Ti02)andATi03(A=Fe，Co，Ni)nanocrystallinescouldbeusedtoproducedimportantsemiconductors，whichhadmanyimportantapplicationsinphotocatalysis，electronics，and magnetics. 币le precipitation as precursor wassynthesizedviahomogeneousprecipitationmethod，andthenitwascalcinedto formnanocrystallines.Thepropertiesofnanocrystallineswereanalyzedanddiscussed.，、It was easier to synthesize precursors possessing equably sizes by controlling thehydrolysis rate ofurea in homogeneous precipitation method. It was found thatthetadditionofH+andsometransitionelementsincludingFe3+，C02+，andNi2+enhancedthe hydrolysis rate of urea and reduced the reaction time. The microstructures，characteristics，mo叩hology and photoc副alytic activity were studied by means ofthermogravimetricanddifferentialscanningcalorimetricanalyses(TG-DSC)，X-raydi曲action (XRD)，transmission electron microscopy (TEM)，po阳，size analyze民UV-Vis diffusereflectance spectroscopy(UV峭Vis)，etc.丁henanocrys阳IlinesofFe2TiOs，CoTi03，orNiTi03weresynthesízedwhentheprecursorswerecalcinedat800.Cfor6h.The nanocrystallineshadfewerdefectsandgranula size were smaller than 100nm. Compared with the as-prepared Ti02nanocrystallines，ATi03nanocrystallineshadlessaveragesurfaceareas.Toinvestigatetheirphotocatalyticactivities，theas-preparedsampleswereappliedinthedecompositionofmethylenebluesolutionunderUVirradiation.Althoughtheas-prepared ATi03 samples had lower catalytic activities，their UV-Vis spectraexhibitedredshifts伽atsuggestedtheirlightabsorptionscopeextendedtothevisiblelightregionandtheirgapbandenergiesbecame narrow.hKeyWords:ATi03(A=Fe，Co，Ni)nanocrystallines，homogeneousprecipitation，Pphotocatalysts目录第…章绪论……..……………川………………………l川纳米材料的基本效应………11.2 纳米二氧化钦(Ti02)的光催化作用31.2.1纳米Ti02 的结构特征…………………………………41.2.2 纳米丁i02 的光催化原理………………………..41.3 纳米丁i02 的光催化改性研究………….………… 6户第二章尿素水解………………………………… 112.1实验部分………………………………112.1.1 分析方法…………………122.1.2 样品的紫外测定过程…，………122.2实验结果及分析………………………132.2.1尿素溶液的吸光度翩浓度标准曲线…………… 132.2.2不问条件下尿索的水解……142.3本章小结………