上转换复合薄膜降解硝基苯废水研究
以硝基苯为目标污染物，对比研究了可见光下纯TiO2膜和上转换光催化复合膜对污染物的光催化降解性能。结果表明，Pr3+:Y2SiO5/TiO2复合薄膜中Pr3+:Y2SiO5与TiO2的最佳质量比为4%，催化剂的最佳投加量为0.4g；在相同光照条件下，Pr3+:Y2SiO5/TiO2复合薄膜较TiO2膜具有更高的光催化性能，前者12小时降解率是后者的1.6倍。对比循环四次的12h降解率发现，TiO2复合膜和纯TiO2膜对硝基苯的第一次降解率分别为84.01%和54.23%，第二次降解率分别为80.75%和51.40%，第三次降解率分别为75.79%和46.54%，第四次降解率分别为62.81%和43.17%。
关键词：溶胶-凝胶法；TiO2；上转换发光材料；光催化；降解率.
毕业论文设计说明书外文摘要
Title: Study on the Degradation of Nitrobenzene Waste Water by Upconversion Composite Film
Abstract
To improve the photo catalytic performance of nano-titanium dioxide and to use it repeatedly, In the first place ,the sol-gel method is used to produce Y2SiO5 up converting luminescence material doped with Pr3+. Using glass fiber filter as membrane carrier substrate, Y2SiO5 up-converting luminescence material copes with nano-titanium dioxide to form photo catalyst composite film. XRD and SEM are used to characterize and analysis the photo catalyst composite film obtained. At length nitrobenzene has been employed as the target pollutants to study the photo catalyst degradation performances of the composite and pure films. The result shows that the best mass ratio of Pr3+:Y2SiO5 and TiO2 of the Pr3+:Y2SiO5/TiO2 composite film is 4 percent. And the best catalyst dosage is 0.4g. Under the condition of same illumination, Pr3+:Y2SiO5/TiO2 shows better photo catalyst performance than nano-titanium dioxide film.The former degradation rate is 1.6 times of the latter within 12 hours In contrast of the degradation ratio in 12h of four times cycle, the degradation ratios of the composite photo catalyst film and pure TiO2 film is 84.01% and 54.23% for the first time, 80.75% and 51.40% for the second time, and 75.79% and 46.54% for the third time,62.81%and43.17% for the fourth times respectively.
Keywords Sol-Gel method，upconversion material; photo catalytic; degradation rate.
上转换复合薄膜降解硝基苯废水研究
目录
1 绪论 1
1.1 研究背景 1
1.2 纳米TiO2光催化剂 1
1.3 上转换发光材料 2
1.3.1 上转换发光机理 3
1.3.2 上转换材料的组成 3
1.3.3 上转换材料的制备方法 4
1.4 研究意义与内容 6
1.4.1研究意义 6
1.4.2主要研究内容 6
2 上转换材料的制备和表征 7
2.1 上转换材料的制备 7
2.1.1实验材料和仪器 7
2.1.2上转换材料的制备流程 7
2.2 上转换材料的SEM表征 8
2.3 上转换材料XRD分析 9
2.4 本章小结 10
3 上转换材料/TiO2复合膜的制备及性能研究 11
3.1 实验材料和仪器 11
3.2 实验方法与流程 11
3.3 纯TiO2膜的SEM和XRD表征 13
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