毕业论文《AgBr／TiO2异质结型复合可见光催化剂的制备及其光催化活性》.doc

PAGE AgBr／TiO2异质结型复合可见光催化剂 的制备及其光催化活性 摘要：以钛酸四丁酯、KBr、AgNO3 为前体，合成了具有异质结结构的纳米AgBr ／TiO2 复合可见光催化剂。光催化降解亚甲基蓝活性结果表明，复合与单组分催化剂的光催化活性顺序为：AgBr／TiO2 AgBr TiO2 。含光敏剂AgBr的复合及单组份催化剂由于具有对可见光的良好吸收性能而具有较高的光催化活性．对 于AgBr／TiO2光催化剂，随mAgBr ／mTiO2比的增加，光催化活性先增强后减弱，当mAgBr／mTiO2 = 3.35时光催化活性最高，分析结果表明，该复合催化剂粒径约 15nm，分散均匀且形成了紧密接触的AgBr／TiO2异质结微结构，在紫外可见区(250-800nm)都具有最强的光吸收． 关键词 ： 可见光催化剂 ； 溴化银 ； 二氧化钛 ； 异质结 ； 亚甲基蓝 指导老师签名： Preparation and Photocatalytic Activity of AgBr/TiO2Heterojunction Complex Catalyst under Visible Light Student name: He gui feng Class: 080233 Supervisor: Xu qiu hua Abstract: Nanosized visible light complex photocatalyst of AgBr/TiO2 with heterojunction structure was synthesized using Ti(OC4H9)4, KBr and AgNO3 as precursors. The results of photocatalytic degradation to methylene blue showed that the activity order of these samples is of AgBr/TiO2AgBr TiO2. The complex and mono-component in visible light region. The photocatalytic activities of AgBr/TiO2 increase first and then decrease with increasing mass ratio of mAgBr ／mTiO2, in which the mass ratio of 3.35 has the highest photocatalytic activity. Analysis revealed that the particle size of this complex photocataylst is about 15 nm with homogeneous dispersion and has formed intimate contact heterojunction microstructure and has the strongest absorption in UV-Vis light region of 250~800 nm. Keyword: visible photocatalyst ; AgBr ; TiO2 ; heterojunction ; methylene blue Signature of Supervisor: 创新思维实践报告 PAGE 8 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc297621241 1 引言 HYPERLINK \l _Toc297621242 1.1 选题的原因和意义 PAGEREF _Toc297621242 \h 2 HYPERLINK \l _Toc297621243 1.2 国内外研究概况及发展趋势 2 HYPERLINK \l _Toc297621244 1.3 光催化剂的研究进展 PAGEREF _Toc297621244 \h 4 HYPERLINK \l _Toc297621245 1.4 研究目标和展望 4 HYPERLINK \l _Toc297621246 2 实验方案设计 HYPERLINK \l _Toc297621247 2.1 实验目的 PAGEREF _