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摘要：光催化氧化技术是近年来研究发展起来的一种新的污染治理技术。研究发现，利用光催化法能够有效地降解甚至矿化水和空气中的各种有机污染物，能够有效地将无机污染物转化成无毒的物质，也可以将氰化物、亚硝酸盐、硫氰酸盐等转化成无毒的形式；还可以应用于抗菌、除臭、空气净化、自洁净材料以及杀死癌细胞等。其中，TiO2具有化学稳定性好、耐腐蚀、高活性、廉价、无毒等优点，因此被广泛地用作光催化剂。
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目前，TiO2光催化剂在水处理的应用中，大多是采用悬浮体系。粉末状悬浮态的TiO2颗粒在液相中与污染物接触面积大，传质效果好，因此催化效率高。但是目前的商品TiO2颗粒细小而且比重较小，在流体中不仅分离困难，难以回收，而且易发生凝聚降低活性，极大地限制了其实际应用。将TiO2固定在某种载体上，可以克服悬浮相TiO2光催化剂的缺点，解决催化剂分离回收难的问题，而且可以根据光催化反应器结构的不同来选择不同载体和工艺。
本论文采用四氯化钛或钛酸四丁酯为钛源前驱体，以间苯二酚和糠醛为炭质前驱物，通过一步溶胶凝胶法制备了二氧化钛光催化剂。通过XRD表征了光催化剂的晶型，SEM和TEM观察光催化剂的微观形貌，氮气吸附脱附分析了光催化剂的孔结构，紫外可见漫反射分析了光催化剂的光吸收性能。通过对亚甲基蓝的光催化降解，比较了不同钛源前驱体所制备的光催化剂的光催化活性。
关键词：可回收；二氧化钛；纳米；光催化剂；应用9463
Abstract：Photocatalytic oxidation technology research developed a new pollution control technology in recent years. Study found that the use of photocatalytic method can effectively degrade or mineralized water and various organic pollutants in the air, contaminants can be efficiently converted into non-toxic inorganic substances can be cyanide, nitrite, sulfur cyanate salt form into a non-toxic; also be used in antibacterial, deodorization, air purification, self-cleaning materials and kill cancer cells. Which, TiO2 has good chemical stability, corrosion resistance, high activity, inexpensive, non-toxic, etc., which is widely used as a photocatalyst.
Currently, TiO2 photocatalyst in water treatment applications, mostly based suspension system. TiO2 powder particles suspended in the liquid state with the contaminants area, mass effect, so high catalytic efficiency. However, the current commodity TiO2 and smaller proportion of small particles in the fluid separation not only difficult, difficult to recycle and reduce aggregation-prone activity, which greatly limits its practical application. The TiO2 fixed on some carrier, suspended phase can overcome the shortcomings of TiO2 photocatalyst, solve the difficult problem of catalyst separation and recovery, and can be based on the structure of photocatalytic reactor to select different carriers and different processes.
This paper adopts the titanium tetrachloride or tetrabutyl titanate as the titanium source precursor, with resorcinol and furfural as carbonaceous precursors, the titanium dioxide photocatalyst prepared step by sol gel method. By XRD characterization of photocatalyst morphology, SEM and TEM observation of microstructure of the photocatalyst, nitrogen gas adsorption stripping analyzes the light catalyst pore structure, ultraviolet visible diffuse light absorption performance of the photocatalyst was analyzed. By photocatalytic degradation of methylene blue, compared the different source of titanium precursor preparation by the photocatalytic activity of photocatalyst.
Keywords：Recyclable； TiO2； Photocatalyst；Nano； Applications
目 录
一 前言 1
1 纳米二氧化钛光催化剂 1
2 TiO2光催化剂在污水处理中的应用 1