【作者】 张美月；

【导师】 王志；

【作者基本信息】 沈阳航空工业学院 ， 安全技术及工程， 2009， 硕士

【摘要】 甲醛是具有较高毒性的物质,有强烈的致癌和致畸作用,室内环境中甲醛超标的问题已经引起人们越来越多的重视。本文主要基于TiO2在气相光催化领域的应用,针对室内环境中的甲醛,开展了一系列相关的实验研究,内容涉及TiO2光催化剂的制备、负载和光催化降解甲醛的性能研究,本实验研究的开展对TiO2光催化净化空气技术的应用具有一定的参考价值。采用溶胶-凝胶法在玻璃基片上成功制备了负载型TiO2薄膜材料,自行设计制作了镀膜装置,确定了制备TiO2薄膜的最佳工艺条件。以甲基橙为目标降解物,检测TiO2薄膜的光催化活性,研究了焙烧温度、镀膜层数、焙烧升温速度及紫外线光照时间对薄膜光催化活性的影响。实验结果表明,焙烧温度为500℃,镀膜层数为3层,焙烧升温速度为5℃/min所制得的负载型TiO2薄膜具有较高的光催化活性。研究了气态甲醛的光催化降解行为,自行设计了甲醛光催化降解反应器,重点研究了甲醛初始浓度、二氧化钛负载量、紫外光照对甲醛光催化降解的影响,实验结果表明,其它实验条件相同的情况下,甲醛初始浓度为95.18μg/L时TiO2薄膜对甲醛的降解率最高。另外,甲醛气体的降解率随TiO2的负载量增加而逐渐增大,紫外光照射对甲醛的降解率明显好于自然光照射的降解率。更多还原

【Abstract】 Formaldehyde is dangerous substance with high toxicity which can induce cancer and abnormality. People have paid more and more attention to superscale of formaldehyde indoors. The study is mainly based on TiO2 application in gas phase photocatalysis, aiming at indoor formaldehyde, a series of correlative experiments were carried on, including preparation of TiO2 photocatalyst, loading and photocatalytic degradation of formaldehyde. The results have proved reference value to photocatalysis technology in purifying air.Titanium dioxide films were prepared on glass substrates by sol-gel method and the best preparation conditions was developed. Designed and made a coating device for prepared TiO2 thin film. The TiO2 thin film purification ability was examined through the degeneration certain density methyl orange experiment. The influences of calcining temperature, coating layer, the speed of rising temperature, the UV illumination on the photocatalytic activities of the TiO2 thin films were also investigated. The experimental results showed that the TiO2 thin films had the higher photocatalytic activity when glass was calcinated at 500℃, with 5℃/min rising temperature speed and was coated three layers.A reaction device was designed for formaldehyde photocatalytic degradation. The photocatalytic degradation behavior of gaseous formaldehyde was studied and the influence factors of formaldehyde photocatalytic degradation, such as initial concentration of gaseous formaldehyde, titanium dioxide quantity, UV illumination were also studied. The experimental results showed that the percentage of degrading gaseous formaldehyde was the highest when the concentration of gaseous formaldehyde was 95.18μg/L, the percentage of degrading gaseous formaldehyde increased with the increasing of quality of TiO2, the percentage of degrading gaseous formaldehyde with UV illumination is better than sunlight.更多还原