凹凸棒土-C3N4-TiO2复合光催化剂制备及其可见光催化性能研究

摘要：本实验用硅烷偶联剂(KH550、KH560、KH570)改性后的凹凸棒土（ATT）为载体,通过原位沉积，结合冷冻干燥、程序焙烧工艺在其表面负载类石墨相氮化碳(g-C3N4)和二氧化钛（TiO2），以制备具有高可见催化性能的ATT-g-C3N4-TiO2复合光催化剂。利用XRD、BET、FT-IR、UV-Vis等手段对样品的结构、形貌及光学性能进行了表征，并以甲基橙作为目标污染物，对ATT-g-C3N4-TiO2进行了光催化性能进行研究。结果表明，ATT-g-C3N4-TiO2的光催化活性明显高于纯的g-C3N4和TiO2。其主要原因归结为ATT、g-C3N4和TiO2的协同效应。接枝的偶联剂不同、C3N4和TiO2质量比例不同时，复合材料的光催化性能不同，当KH560接枝的凹凸棒土、三聚氰胺和TiO2的质量比为1:2:2时，ATT-KH560-C3N4复合光催化剂的光催化活性最高。72515

毕业论文关键词：凹凸棒土，类石墨相氮化碳，二氧化钛，可见光催化

Abstract: In this experiment, a visible-light-driven ATT-g-C3N4-TiO2 catalyst with high photocatalytic performance was synthesized via an in-situ deposition method and combined with freeze drying and roasting process in the program with g-C3N4 and TiO2 as the active component and silylated- attapulgite(KH550、KH560、KH570) as the support。The structure、morphology and optical property of the photocatalyst was characterized by means of X-Ray diffraction (XRD), BET surface area, Fourier transform infrared spectroscopy(FT-IR) and Ultraviolet visible absorption(UV-Vis) methods。 Besides, The photocatalytic activity of the photocatalyst ATT-g-C3N4-TiO2 was evaluated using methyl orange as the target contaminant。 Results show that, the as-prepared ATT-g-C3N4-TiO2 preswnted higher photocatalytic activity than those of pure g-C3N4 and TiO2。 The high photocatalytic performance of the ATT-g-C3N4-TiO2 composite can be attributed to the synergistic effect of ATT、g-C3N4 and TiO2。 The kind of silylated coupling agents and the mass ratio of C3N4/TiO2 have effect on its photoactivity。 The highest photocatalytic performance of the ATT-g-C3N4-TiO2 composite can be obtained as the mass ratio of silylated- attapulgite、g-C3N4 and TiO2 was 1:2:2。

Keywords: Attapulgite, g-C3N4, titanium dioxide, visible light photocatalysis

1 前言 1

2 实验部分 1

2。1 实验材料及设备 2

2。1。1 实验材料 2

2。1。2 实验设备 2

2。2 实验步骤 2

2。2。1 凹凸棒土改性 3

2。2。2 凹凸棒土-C3N4的合成 3

2。2。3 凹凸棒土-C3N4-TiO2的合成 3

2。3 材料表征 3

2。4 材料的光催化性能测试 4

3 结果与讨论 4

3。1 材料表征 4

3。1。1 XRD 分析 4

3。1。2 FT-IR 分析 5

3。1。3 形貌分析 6

3。1。4 UV-vis分析 7

3。1。5 BET分析 9

3。2 Att-kh560-C3N4-TiO2的光催化性能研究 10

结论 13

参考文献凹凸棒土-C3N4-TiO2复合光催化剂制备及其可见光催化性能研究:http://www.youerw.com/huaxue/lunwen_82513.html