碳纳米管负载纳米二氧化钛光电性能研究

分类号 UDC
O64
学校编号 10490 密 级 公开
武汉工程大学
硕士学位论文
碳纳米管负载纳米二氧化钛光电 性能研究
学科专业： 研究方向： 研 究 生： 指导教师： 材料学 等离子体技术与薄膜 王明洋 王升高 教授
二 ○ 一二 年 四 月
独 创 性 声 明
本人声明所呈交的学位论文是我个人在导师指导下进行的研究 工作及取得的研究成果。尽我所知，除文中已经标明引用的内容外， 本论文不包含任何其他个人或集体已经发表或撰写过的研究成果。 对本文的研究做出贡献的个人和集体， 均已在文中以明确方式标明。 本人完全意识到本声明的法律结果由本人承担。 学位论文作者签名： 王明洋 2012 年 5 月 30 日
Major Candidate
: :
Materials Wang Mingyang Prof. Wang Shenggao
Supervisor :
Wuhan Institute of Technology Wuhan, Hubei 430074, P. R. China April, 2012
摘 要
学位论文版权使用授权书 本学位论文作者完全了解我校有关保留、 使用学位论文的规定， 即：我校有权保留并向国家有关部门或机构送交论文的复印件和电 子版，允许论文被查阅。本人授权武汉工程大学研究生处可以将本 学位论文的全部或部分内容编入有关数据库进行检索，可以采用影 印、缩印或扫描等复制手段保存和汇编本学位论文。 保 本论文属于 不保密 Ο。√ （请在以上方框内打“√”） 学位论文作者签名： 王明洋 2012 年 5 月 30 日 指导教师签名： 王升高 2012 年 5 月 30 日 密Ο ， 在 年解密后适用本授权书。
III
武汉工程大学硕士学位论文
annealing, the composites with C doping have better catalytic performance in the visible light than N doping. Through the preparation CNTs/TiO2/conductive plastic compsites electrode, the photoelectric performance of different samples were studied. It could be found that photocurrent of the TiO2 was improved by the tests of IV under the existence of CNTs, which was consistent with the result of the photocatalytic efficiency. Keyword： TiO2/CNTs composites，Photoelectrochemical，Photocatalytic
A Thesis Submitted in Fulfillment of the Requirements for the Degree of Master of Engineering
Photoelectricity Properties in TiO2/Carbon Nanotube Composites
IV
目 录
目 录
摘 要 ...................................................... I
Abstract .................................................. III 目 录 ....................................................... V 第 1 章 综述 ................................................. 1 1.1 引言 ................................................. 1 1.2 光催化原理及 TiO2 的光催化特性 ......................... 1 1.2.1 半导体光催化原理 ................................. 1 1.2.2 TiO2 的光催化特性 ................................. 2 1.3 二氧化钛的结构性能 ................................... 4 1.4 影响二氧化钛光催化的因素 ............................. 5 1.4.1 晶型的影响 ...................................... 5 1.4.2 晶粒尺寸的影响 .................................. 6 1.4.3 比表面积的影响 .................................. 6 1.4.4 表面态的影响 .................................... 6 1.4.5 晶体缺陷的影响 .................................. 7 1.5 TiO2 的改性研究 ........................................ 8 1.5.1 限制纳米 TiO2 光催化性能因素 ...................... 8 1.5.2 TiO2 的掺杂改性研究 ............................... 8 1.5.3 二氧化钛复合材料改性研究........................ 11 1.6 TiO2 的制备及其复合材料制备简介 ....................... 12 1.6.1 TiO2 的制备 ...................................... 12 1.6.2 CNTs/TiO2 复合材料的制备 ......................... 13 1.7 课题背景与研究内容 .................................. 14 1.7.1 研究背景 ....................................... 14 1.7.2 研究内容 ....................................... 15 第 2 章 实验材料及实验方法 ......................程大学硕士学位论文
II
Abstract
Abstract
Due to its large band gap energy,TiO2 only can absorb UV light, which is less than 5% in solar spectrum. Therefore, the study on the TiO2 photocatalyst with visible light-responsive property is the most challenging subject in the field of photocatalysis. In this paper, CNTs/TiO2 composites were generated. Our preliminary investigation also used dopping C, N to enhance the photocatalytic activity of TiO2 with plasma doping system. CNTs in the composites were to improve the photocatalytic performance by enhancing the electron mobility. Through the N, C doping modification of titanium dioxide increase light ring scope, improving electronic transition probability. The CNTs were prepared through the chemical vapor deposition method. The CNTs were treated with oxygen plasma and soaked in H2SO4 for acidification. After acidification the CNTs were treated with oxygen plasma again and exposed to air to absorb moisture. The TiO2-CNTs namocomposites were successfully fabricated by TiCl4 hydrolyse on the surface of CNTs. The TiO2/CNTs nanocomposites were annealing with different temperature using the tube furnace, which was purged with Ar. Then, dopping C, N enhances the photocatalytic activity of TiO2 with microwave plasma doping system for different treatment conditions. The result of CNTs with plasma modified were characterized by FT-IR spectroscopy.TiO2/CNTs nanocomposites’ nanostructures and microstructures were characterized by SEM、 TME、 X-ray、 XPS and UV-Dis. Our preliminary investigation also indicates that dopping C, N enhances the photocatalytic activity of TiO2 with plasma doping system and the prepared TiO2/CNTs are sufficiently active and robust for photocatalytic degradation of organic compounds. The sample with appropriatie CNTs content had better photocatalytic performance than the TiO2.With the same temperature of