论文总字数：21943字

摘 要

自1972年日本学者Fujishima和Honda在n型半导体TiO₂单晶电极上实现水的光电催化分解制氢气以来，多相光催化技术引起全世界科技工作者的极大关注。其中光催化污染物降解，可利用储量丰富的太阳能作为能量来源，将大分子污染物降解为对环境无污染的小分子，这项研究对解决目前的环境污染问题，具有重要意义。

TiO₂在降解很多环境污染物中有着优秀的光催化性能，然而TiO₂存在着某些方面的问题：其光生电子空穴复合率较高，量子效率觉低，这样就导致了光催化活性的降低。{001}面TiO₂光催化剂比{101}面TiO₂的光催化活性更高，但是{001}面是高能面，在晶格生长过程中通常会迅速减少，大部分可用的锐钛矿TiO₂晶格主要表现为{101}面(gt;94%)。08年鲁等人发现采用F离子可有效抑制其它晶面的生长，有利于{001}面形成。这对光催化领域的发展有着十分重大的指导意义^[1]。

此研究主要通过TiO₂制备过程中HF量的改变调节TiO₂{001}和{101}面的暴露比。研究他们的暴露比在光催化降解MO反应过程中的影响。通过我们的研究发现，当HF量为1ml（钛酸四丁酯12ml）时活性最好。通过分析得出其具有最高活性的原因是两者的暴露比最优。

关键词：光催化、二氧化钛、有机污染物、{001}和{101}面暴露比

Enhanced Photocatalytic CO₂-Reduction Activity of Anatase TiO₂ byCoexposed {001} and {101} Facets

ABSTRACT

Since the 1972 Japanese scholars Fujishima and Honda in the n-type semiconductor TiO₂ single crystal electrode water photoelectric catalytic decomposition of hydrogen since， multiphase photocatalytic technology caused great attention of the world's science and technology workers. The photocatalytic degradation of pollutants，the abundant solar energy as an energy source，the macromolecular degradation of pollutants as no pollution to the environment of small molecules，this research to solve the problem of environmental pollution has important significance.

TiO₂ in the degradation of many environmental pollutants showed excellent photocatalytic performance，but TiO₂ exist some problems: the photogenerated electron hole recombination rate is higher， the quantum efficiency is low， resulting in the photocatalytic activity decreased. {111} planes of TiO₂ photocatalyst compared to {101} TiO₂ has higher photocatalytic activity，however {001} is high-energy surfaces，in the crystal growth process will usually decrease rapidly. Most of the available anatase TiO₂ crystal lattice is {101} (gt;94%). 08 years Lu et al found that F can effectively inhibit the growth of other crystals，which is conducive to the formation of {001} surface.. This has great significance for the development of the photocatalysis field ^[1].

This study mainly through the TiO₂ of the process of the amount of HF change TiO₂{001} and {101} exposed proportion of exposure. To study their exposure to the effects of the photocatalytic degradation of MO during the reaction. Through our study， when the amount of 1ml was HF (four butyl titanate 12ml)， the activity was the best.. The reason of the highest activity is that the exposure ratio is the best.

Keywords: photocatalysis， titanium dioxide， organic pollutants， {001} and {101} exposure proportion.

目录

第一章 绪论 错误！未定义书签。

1.1光催化降解的意义 5

1.2光催化降解甲基橙的原理 6

1.3 TiO₂光催化降解的进展 9

1.3.1 贵金属沉积 9

1.3.2 离子掺杂 9

1.3.3 表面光敏化及表面络合物作用 10

1.3.4 形成异质结结构 10

1.4 本论文研究内容及意义 11

参考文献 12

第二章 光催化性能的影响因素及样品的表征方法 15

2.1光催化材料催化性能的影响因素 15

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