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摘 要：本论文以筛选稳定、高效、易分离的磁分离型可见光催化剂为目标，通过将活性组分FexOy、TiO2、BiOBr有效固定在凹凸棒土表面，合成系列磁分离型凹凸棒土基可见光催化剂。采用XRD、BET、UV-ViS、磁强计以及光催化降解等测试手段对所合成的光催化剂的结构、形貌进行表征。以可见光催化降解对硝基苯胺为探针，研究了所得材料的光催化性能，并考察了不同配比r=nFexOy:nTiO2:nBiOBr对其光催化性能的影响。具体研究内容如下：66136
1．磁分离型凹凸棒土-FexOy-TiO2-BiOBr的制备、表征及其可见光催化性能研究
以凹凸棒土为载体，通过原位-沉积法，将一系列不同比例的FexOy、TiO2和BiOBr (r=nFexOy:nTiO2:nBiOBr=1:1:1、1:1:3、1:3:1)依次负载在凹凸棒土上，形成了凹凸棒土-FexOy-TiO2-BiOBr（标记为ATT-FexOy-TiO2-BiOBr）磁分离型复合型光催化剂。研究结果表明，FexOy-TiO2-BiOBr颗粒均匀地包裹在凹土表面，比表面积大，而且具有良好的磁性。光催化数据显示，磁分离型凹凸棒土复合光催化剂显示出优异的光催化性能，而且r不同时，ATT-FexOy-TiO2-BiOBr的光催化性能不同。当r=1:1:1，凹凸棒土为0.1g时，复合光催化剂的光催化效果最好，可见光催化降解3h后，对硝基苯胺的降解率达到了75.74%。
2．磁分离型凹凸棒土-TiO2-FexOy-BiOBr的制备、表征及其可见光催化性能研究
以凹凸棒土为载体，通过原位-沉积法，将一系列不同比例的TiO2、FexOy和BiOBr (r=nFexOy:nTiO2:nBiOBr=1:1:1、1:1:2、1:1:0.5、1:1:3、1:2:2、1:0.5:2)依次负载在凹凸棒土上，形成了凹凸棒土-TiO2-FexOy-BiOBr（标记为ATT-TiO2-FexOy-BiOBr）复合型光催化剂。研究结果表明，FexOy-TiO2-BiOBr颗粒均匀地包裹在凹土表面，比表面积大，而且具有良好的磁性。光催化性能分析表明，r=nFexOy:nTiO2:nBiOB包覆配比不同，ATT-FexOy-TiO2-BiOBr的光催化性能不同。当r=1:1:2，复合光催化剂的光催化效果最好，可见光催化降解3h后，对硝基苯胺的降解率达到了74.84%。
毕业论文关键词：FexOy，BiOBr，TiO2，凹凸棒土，磁分离，可见光催化，对硝基苯胺
Abstract: In order achieve stable, highly active and easily separate visible-light-driven photocatalysts, FexOy、TiO2、BiOBr were deposited onto the surface of a series of attapulgite via in-stiu fixing method. To study the structure, morphology and magnetic property, these resulting materials were characterized by XRD, BET, UV-Vis and magnetometer. Photodecomposition of p-Nitroaniline was used as the model system to investigate the Attapulgite photocatalytic activity before and after modification, and the effect of r=nFexOy: nTiO2: nBiOBr on its activity was also studied. The detailed works were shown as the following:
1. Studies on preparation, characterization and photocatalytic performance of Attapulgite- -FexOy-TiO2-BiOBr
The attapulgite was taken as a substrate and a series of FexOy、TiO2、BiOBr with different portion (r=nFexOy:nTiO2:nBiOBr=1:1:1、1:1:3、1:3:1) were coated on the surface of attapulgite in turn by in-situ depositing technique. The obtained products were marked as ATT-FexOy- TiO2-BiOBr. Results showed that FexOy-TiO2-BiOBr nanocomposite particles were successfully introduced onto the Attapulgite fibers’ surface without obvious aggregation and the specific surface area was successfully improved. The products possess good magnetic properties too. ATT-FexOy-TiO2-BiOBr exhibits exceptional photocatalytic activity in degradation of p-Nitroaniline. The photodecomposition rate of p-Nitroaniline varies according to the molar ratio of r=nFexOy: nTiO2: nBiOBr. The highest degradation rate was reached by using ATT-FexOy-TiO2-BiOBr (r=1:1:1), which was up to 75.74% within 180 min.
2. Studies on preparation, characterization and photocatalytic performance of Attapulgite- - TiO2-FexOy-BiOBr
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