- 學位論文
多層二氧化鈦光觸媒降解水中 亞甲基藍以及氨之研究
Photocatalytic Degradation of Methylene Blue and Ammonia in Water by Multilayer Titanium Dioxide
摘要
本研究主要探討不同層數的二氧化鈦薄膜，經由紫外線行光催化反應，對於亞甲基藍以及氨的降解效率來探討，然而粉末狀之二氧化鈦在使用上需要過濾的程序，對於能源及時間有可觀之消耗，所以將二氧化鈦固化於適當基材上可增加其使用上之效益，免除了粉末型二氧化鈦光觸媒使用後之回收問題。由SEM可以觀察出各層數的二氧化鈦都長得非常緻密以及均勻，可以清楚看出層數上的差異，且二氧化鈦的結晶顆粒也非常清晰，由實驗結果可得知，在紫外燈管為365 nm 18 W 的條件下，三層二氧化鈦及達到最佳化的實驗成果，若再往上遞增，並無法提高反應速率，因為無法再激發出更多的電子電洞對，降解氨的實驗則還需要犧牲試劑例如甲醇，但考慮到水質的問題，本研究不採用甲醇而是選用乙醇作為犧牲試劑，而結果可得知乙醇確實能有效幫助降解氨。
並列摘要
This study focused on titanium dioxide thin films with different thickness for the UV photocatalytic reaction. The efficiency of photocatalytic degradation of methylene blue and ammonia will be evaluated. However, titanium dioxide powders require filtering process, and it results in the consumption of considerable energy and time. The titanium dioxide films were solidified on the substrate, and it can increase the effectiveness of reuse. We eliminate the recycling problems of titanium dioxide photocatalyst powders. It can be observed that the titanium dioxide thin films with various layers are very dense and uniform. The crystalline particles of titanium dioxide can be observed by SEM obviously. Three-layer titanium dioxide films show the best effect on the photocatalytic degradation of methylene blue and ammonia under the illumination of 365 nm, 18 W UV lamp. The reaction rate cannot be increased for the four-layer titanium dioxide films because there is no more electron-hole pairs can be stimulated. The degradation of ammonia needs sacrificial reagents. In this study we do not use methanol but use ethanol as a sacrificial reagent. The result shows that ethanol can really enhance the degradation of ammonia.