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1、中文摘要。中文摘要本論文以鈦酸四丁酯為鈦源,‘以高濃度鹽酸溶液為反應介質,采用水熱法制備了純銳鈦礦相、純金紅石相及銳鈦礦與金紅石混相納米Ti02粉體。利用Ⅺ如、P,sanala、TEM及FT-IR等現(xiàn)代分析技術,考查了表面修飾劑、誘導溫度和誘導時間等因素對納米Ti02晶相結構的影響,并分析了不同反應條件下納米Ti02晶體的生成機制。實驗結果表明,表面修飾劑對晶相的控制起著至關重要的作用。DBS的苯磺基可與['ri06】八面體相鄰的羥基配體形成氫鍵或類脂鍵,限制水解產(chǎn)物形成的生長基元結構;誘導溫度的變化可影響DBS在體系中的解離度,即影響苯磺基的濃度,從而
2、影響生長基元的結構:通過調節(jié)誘導時間可以控制生成不同晶相晶核的數(shù)量及體系中游離Ti4+源的濃度,從而制得不同晶相的Ti02納米晶。,最終制得的Ti02納米晶粒徑小、晶化度高、分散性好,晶粒尺寸在4---15rim左右。.以羅丹明B溶液作為目標降解物,考查了不同晶相n02納米晶的光催化效能。實驗結果表明金紅石含量為20%的混晶樣品光催化活性最高,優(yōu)于P25Ti02光催化劑。利用純金紅石相Ti02納米晶自制的防曬霜紫外屏蔽效果及穩(wěn)定性更好,優(yōu)于市售的化學防曬及物理防曬商品,且具有無毒、不被吸收等優(yōu)點。..:.關鍵詞:二氧化鈦;晶相控制:光催化:紫外屏蔽黑龍江
3、大學碩士學位論文.AbstractPurerutilenano-powder,pureanatasenRIlo—powderandmixed·PhaseTi02weresynthesizedbyhydrothermalmethod,usingtetrabutyliltanate(TBT)嬲material,usingllighconcentrationofhydrochloricacidasacidicmedium.硼1eeffectsofexperimentalconditionstothestructureoftheproducts,suchasst
4、ructureguidingreagentandagingtemperatureandagingtime,wereexaminedviaXRD,TEM,Raman,FT-Ⅱ乙SPSandUv-vischaracterizationmethods.ThegrowthmachanismofnRno-Ti02wasanalysedunderthedifferentreactionconditions.Theexperimentalresultssuggestedthatthetypeandamountofstructureguidingreagentpalye
5、daimportantroletocontrollcrystallinephase.HydrogenbondsorupidbondscouldbeformedbetweensulfonicgroupintheDBSandhydroxylgroupneighboronthe[aaOdoetahedron,andthesew.ouldlimitthestructureofgrowthunits,whichhasbeenformedfromhydrolysate.nechangeofagingtemperaturecouldaffectthedisassoci
6、ationofDBS,whichwouldaffecttheconcentrationofsulfonicgroup.Asaresult,thestructureofgrowthunitswereaffected.nedifferentagingtimecouldcontrolthecrystalnuclearamountsofdifferent’crystallinephaseandtheconcentrationofdissociativeTi4+insystem.Consequently,nano.Ti02ofdifferentcrystallin
7、ephasecouldbeobtained.?!ぬ镗輒ixed-PhaseTi02particles、Ⅳithgoodcrystallizationanddispersionworosphericalmorphology,andtheirdiametersizeswere4--。15nm.11圯experimentalregultssuggestedthatthenano-powdercontaining20%futileand80%afiatase.啊埔mixed—Phase前02showedthehigherphotocatalyticactivit
8、y,whiohexcelledP25photocatalyst.Thcself-