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1、重庆理工大学硕士学位论文2、14种材料中以共沉淀法制备的Gd-TiO2的催化活性最高(表观反应速率常-1数为0.032min),主要的原因可能是钆的7f电子层是半充满状态。当钆离子捕获电子后,半充满的电子形态被破坏,其稳定性下降,被捕获的电子容易转移到吸附在催化剂表面的氧分子,钆离子返回到原来的稳定半满电子结构,这个过程中,电子被传递,有效抑制了电子空穴的复合,提高了二氧化钛的光催化活性(活性评价)。3、溶胶凝胶法制备的同一稀土元素掺杂二氧化钛的饱和吸附能力大于共沉淀法,主要是由于溶胶凝胶法制备稀土掺杂二氧化钛的比表面积是共沉淀法的2.35
2、22倍(SG1.0wt.%Gd-TiO2-600:36.9m/g,COP1.0wt.%Gd-TiO2-800:14.8m/g)(BET测定),同时也说明材料吸附能力的大小不是活性大小决定因素。4、两种方法制备的稀土掺杂二氧化钛表面O/Ti原子比稍大于2(平均为2.02),氧含量较高的原因可能是该催化剂表面上存在Gd2O3(XPS)。5、稀土掺杂TiO2具有较为明显的抗菌性能,且共沉淀法制备的稀土掺杂二氧化钛抑菌圈明显大于溶胶凝胶法,共沉淀法中以Gd、Yb、Sm抗菌活性最高,这与光催化评价结果相似。关键词:稀土掺杂二氧化钛;共沉淀法;溶胶凝胶
3、法;等温吸附线;抗菌II万方数据AbstractAbstractNanotitaniumdioxideisappliedtoitsearlydiagnosisandmedicaltreatmentbyitsnanoproperties;titaniumdioxideisbiologicalsafetyandgoodcompatibility,ithavebeenusedforawiderangeofimprovingtraditionbiomedicalmaterials’compatibility;TiO2alsoisathorougha
4、ndlong-lastingantimicrobialbactericidalantibacterialmaterialsandiswidelyusedforimprovingtheantibacterialpropertiesoftraditionbiologicalmaterialsandmedicaldevicesurfaceandhealthcare,TiO2relatedtodailylifegoodsconcludekitchensanitation.householdappliances.buildingmaterials.e
5、xpresswayfacilitiesandsoon.Titaniumdioxideasahealth-basedantimicrobialmaterialnotonlyhasantibacterialandcleanairfunction,butalsoisnon-toxic,tasteless,non-irritating,goodheatresistance,chemicalstability,lowcostsandsoon,butitisundeniablethatTiO2hasitsselfproblem,themostimpot
6、antisthatthephotocatalyticactivityisnothigh.MetalionsdopedcaneffectivelyimprovethephotocatalyticactivityofTiO2.Atpresent,scholarsusuallystudied1-3speciesofrareearthdopingtitaniumdioxidewithonekindofmethod,buttherareearthdopedtitaniumdioxidepreparedindifferentways,andtheyev
7、aluatedunderdifferentevaluationsystemresults,sothereisnocomparative.Atpresent,somescholarsprepared1-3speciesofrareearthdopedbyusingonemethod,orpreparedrareearthdopedtitaniabydifferentmethods,andevaluatedunderdifferentevaluationsystem.Therearesomequestions,theirresultscann’
8、tcompared.SowhichrareearthelementisthebestforimprovingthephotocatalyticactivityofTiO2.Thi