摘要光催化氧化技术近年来一直被国内研究人员所关注。它利用光能生成羟基自 由基等强氧化性基团，一方面可达到环境光催化目的，使有机污染物得到有效降 解，甚至实现有机物完全矿化；另一方面能光解水产氢，应用于能源光催化领域。 因此，在环境污染治理和能源开发领域中，“节能”又“环保”的光催化氧化技 术一直是处于核心地位。81710

本论文采用半导体 MoO3 对 TiO2 进行改性，从而制备出高活性复合光催化 剂。本论文综合分析光降解柠檬黄，首先以钛酸四正丁酯、钼酸铵、柠檬酸为原 料，采用溶胶—凝胶法制备了具有高分散性和大比表面积的 MoO3/TiO2，在用浸 渍—焙烧法，以钼酸铵和二氧化钛为原料制备催化剂。分析了 MoO3/TiO2 对柠檬 黄降解的最佳工艺条件并采用柠檬黄对催化剂进行光催化性能测试。

X 射线衍射（XRD）和扫描电子显微镜（SEM）分析发现：5%MoO3/TiO2 表面分散均匀晶体形貌良好。光降解柠檬黄最佳因素分析和光催化活性测试实验 表明：

（1）溶胶-凝胶法中 5%MoO3/TiO2 的光催化活性最好，浸渍—焙烧法中10%MoO3/TiO2 最好，而对这两种催化剂比较，后者的光催化活性最好。

（2）柠檬黄最适初始浓度 10mg/L、5%MoO3/TiO2 最佳投加量为 1g/l，pH 为 7，光照时间为 30min，汞灯功率为 500W，光催化氧化条件最佳，柠檬黄模 拟废水的去除率为 93%；

（3）当掺杂量为 1%时，可以显著提高催化剂的催化活性，并且最佳掺杂量 为 5%。

毕业论文关键词：光催化氧化；复合型光催化剂；MoO3/TiO2；柠檬黄

Abstract In recent years,domestic researchers pay attention to the photocatalytic oxidation technology for a long time。It uses light energy to generate hydroxyl radicals and other strong oxidizing groups。On one hand,it can reach the ambient light catalytic purposes to degrade the organic pollutants,even achieve complete mineralization of organic matter。On the other hand,it can use light energy to degradation water in order to hydrogen production,which will be applied in the field of energy photocatalysis。Therefore,in the field of environmental pollution control and energy development,the“energy saving” and “environmental protection” of the photocatalytic oxidation technology has been in a core position。

The dissertation was using semiconductor MoO3 modifying TiO2, thereby producing a type of highly active nanometer photocatalytic material。 To obtain such a high active composite nanometer photocatalytic material, the paper firstly used tetra-n-butyl ester, ammonium molybdate and citric acid as raw materials, using the sol-gel method to produce MoO3/TiO2, which had high dispersion and large surface area。By the dipping calcination method,use ammonium molybdate and TiO2 to produce。Based on it, the paper analyzed the best condition of 5% MoO3/TiO2 degrading crystal violet and glyphosate, and using lemon yellow to test the photocatalytic activity of catalyst prepared。

X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis showed that the surface of 5% MoO3/TiO2 dispersed and the crystal morphology is good。The experiment showed that the sol-gel method had a good promotion on MoO3 and TiO2 compound of photo-generated electron - hole effective separation。 The best condition of light degrading lemon yellow analysis and photocatalytic activity test experiments showed that:

(1)The   optimum   initial   concentration   of   lemon   yellow,   dosage   of  5% MoO3/TiO2, pH and exposure time was 10mg/L, 1g/L, 7 and 30min, respectively。 The ower of mercury lamp was 500W。 When the conditions of photocatalytic degradation were optimal, the crystal violet degradation rate was 93%。