ZnO包覆TiO2复合材料的制备及其性能研究

《ZnO包覆TiO2复合材料的制备及其性能研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、滨州学院本科毕业设计（论文）ZnO/TiO2复合材料的制备及其性能研究摘要本实验以Ti(SO4)2、ZnSO4为原料，尿素为沉淀剂，十二烷基苯磺酸钠（SDBS）为表面活性剂，采用非均相沉淀法制备ZnO包覆TiO2的复合材料。通过五因素四水平的正交实验制备包覆粉体，以其作为催化剂对甲基橙（MO）进行了光催化降解实验，根据催化效果获得制备包覆材料的最佳条件：沉淀剂用量为1:20，包覆比为3:1，反应温度为90℃，煅烧温度为450℃，煅烧时间为1h。实验表明：在最佳条件下制备包覆材料和纯的ZnO、TiO2粉体，其粒径分别为150n

2、m、126nm、134nm。并用红外光谱分析仪、X-射线衍射仪对包覆粉体表征，其相关峰都与ZnO的接近，可知形成的包覆层较好。通过对MO紫外照射120min的降解实验知：氧化锌的光催化性能最好；在ZnO的包覆后，TiO2的降解率由73.5%提高到83%；并且甲基橙的浓度越小，降解效果越好。包覆产物在碱性（pH为10）条件下的光催化能力较中性条件下稍强；在pH为6.5，催化剂最佳用量为1g/L，光照180min的条件下光催化的降解率可达86.3%。关键词：ZnO；TiO2；包覆；非均相沉淀；光催化I滨州学院本科毕业设计（论文）

3、ResearchonPreparationandPropertiesofZnO/TiO2CompositeMaterialAbstractInthisexperiment,withTi(SO4)2andZnSO4forrawmaterials,ureaastheprecipitatingagentandsodiumdodecylbenzenesulfonate(SDBS)assurfactant,theZnOcoatedTiO2compositematerialswassynthesizedbythemethodofhete

4、rogeneousprecipitation.Throughtheorthogonalexperimentwithfivefactorsandfourlevels,thebestconditionstosynthesizecompoundthematerialwhichhavethestrongestabilitytocatalyzeorange(MO)werefoundout.Theresultsofphotocatalyticdegradationexperimentsshowedtheoptimalconditions

5、werethatthecoatedratioof3:1,theprecipitantratioof1:20,thereactiontemperatureof90℃andcalcinedin450℃for1hour.WesynthesizedthecoatedmaterialundertheoptimalconditionsandusehomogeneousprecipitationmethodtopreparepureZnOandTiO2.Theparticlesizesofthemrespectivelywere150nm

6、,126nm,134nmrespectively.ThroughthecharacterizationbyInfraredspectrometerandX-raydiffractometer,therelatedpeaksofthecoatedpowerwereclosetoZnOwithnoobviouspeaksofTiO2appearedwhichindicatedthecoatedpowerwaswelldone.ThroughtheexperimentsofUVirradiationanddegradationMO

7、for120minweknewthatzincoxidehadthestrongestphotocatalysisability,thenfollowedbyZnO/TiO2andthedegradationrateofTiO2wasincreasedfrom73.5%to83%aftercoated.Thesmallerconcentrationofmethylorangemadeabilityofcatalyststronger.UndertheconditionsofpH6.5,thebestdosageofcatal

8、yst1g/Landlightingfor180minthedegradationratecouldreachto86.3%.Keywords:ZnO;TiO2;coated;heterogeneousprecipitation;photocatalyticI滨州学院学士学位论文目录引言1