凹土-FexOy-SnO2-BiOBr复合催化剂的制备及性能研究

摘要：采用原位沉积法将FexOy负载于凹凸棒土（简称凹土，ATT）表面制备高分散性磁性凹土，再通过原位溶胶-凝胶工艺将不同比例的SnO2和BiOBr依次沉积磁性凹土表面制得高稳定性的磁分离型凹土基复合光催化剂（标记为ATT-FexOy-SnO2-BiOBr），采用XRD，BET，SEM，UV-vis等分析测试技术对产物进行了表征。结果显示FexOy、SnO2-BiOBr均匀高效地负载在凹土表面，复合材料比表面积大，且具有良好的光催化活性和良好的磁分离特性。以甲基橙为探针，在H2O2存在下，探究该复合光催化剂对10mg/L甲基橙的可见光催化性能，以及不同体积偶联剂KH560、不同比例SnO2/BiOBr对其光催化性能的影响。结果表明：当偶联剂KH560的体积为7ml，m(SnO2) : m(BiOBr)=3:26时，复合材料的光催化效果最佳，光降解3h后，甲基橙的降解率达到91。12%。91498

毕业论文关键词：FexOy，SnO2-BiOBr,可见光催化，凹凸棒土，甲基橙

Abstract: In this paper, a highly stable and magnetic composite photocatalyst of ATT-FexOy-SnO2-BiOBr was fabricated via loading FexOy on the surface of Attapulgite by in-situ deposition method and then depositing SnO2 and BiOBr onto ATT with different ratio by sol-gel method。 Subsequently, the obtained products were characterized by XRD, SEM, BET and UV-vis analysis。 Results show that FexOy, SnO2 and BiOBr are uniformly and efficiently deposited on the surface of ATT, and as the result, the obtained ATT-FexOy-SnO2-BiOBr present large specific surface area。 The composite not only has good photocatalytic activity but also has good magnetic separation characteristics。 Photodecomposition of 10mg/L methyl orange under visible light was used as the model system to investigate the photocatalytic activity of the obtained products in the presence of H2O2。 At the same time, the influence of different volume of coupling agent KH560 and different ratio of mSnO2/mBiOBr on the photocatalytic activity of the obtained products was also investigated to obtain the optimized photocatalytic condition。 According to experiments, the volume of the coupling agent KH560 fixed at 7mL and the mass ratio of mSnO2/mBiOBr set at 3:26 are the best synthetic condition。 After degradation for 3 h, the degradation rate of methyl orange reached 91。12%。

Key words:FexOy, SnO2-BiOBr, visible-light photocatalysis, Attapulgite, methyl orange源G于J优L尔V论N文M网WwW.youeRw.com 原文+QQ75201`8766

1 前言 1

2 实验部分 2

2。1 实验试剂和仪器 2

2。2 复合光催化剂的制备 2

2。2。1 凹土的改性 3

2。2。2 ATT-FexOy的制备 3

2。2。3 ATT-FexOy-SnO2的制备 3

2。2。4 ATT-FexOy-SnO2 -BiOBr复合光催化剂的制备 3

2。3 材料表征 4

2。4 材料的光催化性能 4

3 结果与讨论 5

3。1 催化剂的表征 5

3。1。1 XRD结果分析 5

3。1。2 BET分析 6

3。1。3 SEM形貌分析 7

3。1。4 UV-vis漫反射分析 8

3。1。5 磁学性能分析 9

3。2 复合光催化材料的催化性能研究 9

3。2。1 不同样品光催化性能的研究凹土-FexOy-SnO2-BiOBr复合催化剂的制备及性能研究:http://www.youerw.com/huaxue/lunwen_198994.html