纳米tiolt2gt光催化性能的研究

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1、摘要很多固体可以作为光催化剂，其中Ti02是最佳的。Ti02用途颇广，可用于水溶液中有机分子的光氧化，也可用于杀灭细菌。就光催化来讲，锐钛矿型Ti02催化效率最高，尤其是对液固体系中有机物具有好的光降解作用。在各种Ti0：的制备方法中，溶胶凝胶法是很重要，因为这种方法容易获得尺寸小、活性高的Ti02纳米晶。本文采用溶胶凝胶法制备了纯Ti02纳米晶和Fe”掺杂(O．25，O．75，l％的Fe)Ti02纳米晶，并用差热分析、x．射线衍射、透射电镜、红外光谱等方法进行表征。以降解亚甲基蓝以及降解废水中有机物来对其催化性能进行评价。结果表明Fe”掺杂没有影响

2、Ti02纳米晶的晶体结构，却显著影响Ti02粒子的光催化活性。Fe”掺杂Ti02纳米粉末的光催化活性要优于纯Ti02纳米粉末。对于降解亚甲基蓝，含Fe”0．75％的Ti02粉末的催化性能最好。而对于降解废水，掺Fe3十l％的Ti02粉末催化性能最好。采用浸渍提拉法在玻璃基片上制备了具有光催化活性的Ti02薄膜。研究表明Ti02薄膜具有较高的光催化分解能力。采用溶胶一凝胶法将Ti02负载于膨胀珍珠岩材料上，制成漂浮负载型Ti02光催化剂，并被应用于亚甲基蓝和污水的光催化降解。关键词：溶胶凝胶法；二氧化钛；光催化；铁掺杂；薄膜燕山大学工学硕士学位论文Ab

3、stractManysolidshavebeenusedasphotocatalysts，butthebestonehasbeenfoundtobeTi02。Ti02andmetal—dopedTi02areofavarietyofapplicationssuchasphoto-oxidationoforganicmoleculesinaqueoussolutionsorsterilization．Anataseisthemostefficientonebyaphotocatalyticpointofviewandinparticulartophot

4、odegradeorganicspeciesinliquid—solidsystemsAmongvariouspreparationmethodsforTi02．theSol—Geltechniqueappe'trs“、beveryinterestingbecauseitallowsonetoobtainverysmallandhighlyat：ivityTi02nanocrystals．ThepureandFej+一doped(0，25，O．75andl％inFe)Ti02nanocatalystswerepreparedbySol-Gelproc

5、essing，andcharacterizedbyDTA，XRD，TEM，IR．Thephotocatalyticactivitywasevaluatedbyphotocatalyticdegradationofmethyleneblueandphotocatalyticdegradationoforganisminwastewater．TheresultsindicatethattheconcentrationofFe3+dopantdoesnotinfluencethecrystalstructureofthenanocatalysts，buts

6、ignificantlyaffecttheirphotocatalyticactivity．CatalystswiththeFeshowaconsiderablybettercatalyticbehaviorthannon—dopedTi02．ThebestefficiencyforphotoeatalyticdegradationofmethylenebluewasobtainedbytheO．75at．％Fe”-dopedTi02nanocatalyst．butThebestefficiencyforphotocatalyticdegradati

7、onoforganisminwastewaterwasobtainedbythe1at．％Fe”-dopedYi02nanocatalyst．ThephotocatalyticTi02filmoncommonglasshasbeenmadebydip—coatingmethod．TheresultsindicatethatTi02filmhasphotocatalyticdecompositioneffects．Ti02wasimmobilizedonexpandedperlitematerialusingtheSol—Gelprocess．TheT

8、i02／EPphotocatalystwaspreparedandappliedtothedegradati