- 學位論文
應用回收鑭摻雜二氧化鈦光催化劑之 空氣濾材於丙酮及氮氧化物降解應用之研究
The Application of Recycled Lanthanum Doped Titanium Dioxide Photocatalytic Air Filter in Acetone and NOx Degradation.
摘要
本研究以循環經濟為出發點，萃取廢棄螢光粉中鑭元素改質二氧化鈦，修補二氧化鈦的缺陷，並以光催化的手段高質化回收的鑭金屬，使用鈦酸四丁酯作為二氧化鈦之原料，輔以乙醇及低濃度的鹽酸，透過實驗製程之微調，改善傳統之溶膠凝膠法，合成鑭摻雜之二氧化鈦光催化劑塗料，利用含浸法將塗料均勻塗布於陶瓷過濾片上，並探討光催化材料於室內低濃度之污染氣體的處理性能。利用密封容器封裝二氧化鈦溶膠，改進傳統之溶膠凝膠法，利用60oC加溫12小時大幅縮短溶膠陳化時間。透過XRD及XPS圖譜清楚說明，本合成方法所合成之物質確實為鑭摻雜之二氧化鈦，並且鑭摻雜能改變改變其光吸收範圍，並提高光催化性能。 本研究製備之光催化空氣濾片，使用可見光降解丙酮以0.5wt%La/TiO2具最佳降解效果為36.9%，比商業二氧化鈦之23.5%更佳且使用可見光降解一氧化氮以0.5wt%La/TiO2具最佳降解效果為77.2%與二氧化氮生成量8ppb，比商業二氧化鈦之一氧化氮處理效率76.5%與二氧化氮之16ppb降解更多的一氧化氮，同時抑制二氧化氮的生成，整體降解更多的氮氧化物毒性。 最後，計算本研究所合成之鑭摻雜二氧化鈦平均每克之成本為13.43元，商業型二氧化鈦-P25每克僅需5.8元，然而製作一片鑭摻雜二氧化鈦光催化濾片之成本僅需182.3元，雖然本研究所製備之材料比起商業型二氧化鈦價差4倍，但不論在丙酮或一氧化氮的降解效果卻著實比商業型二氧化鈦更佳，且塗布於陶瓷過濾片將能大幅提升光催化的降解效率。
並列摘要
From the circular economy, we use lanthanum modified titanium dioxide from the waste phosphor powder extraction, and the use of lanthanum to repair titanium dioxide defects. In this study, tetrabutyl titanate(TBOT) was used as the raw material for titanium dioxide, supplemented with ethanol and low concentration of hydrochloric acid. Improve the traditional sol-gel method is to use a sealed container to encapsulate the TiO2-sol, and shorten the sol aging time at 60 ° C and 12 hours. The coating was uniformly coated on the ceramic filter by impregnation method, and the treatment performance of the photocatalytic material in the indoor low concentration of polluting gas was discussed. In this work, we report a suite way to synthetic lanthanum doped titanium dioxide photocatalytic coating on porous air filter in gas degradation with enhanced air pollution treatment efficiency for NO and Acetone removal. Compared to titanium dioxide, which is capable of removing 65% nitric oxide and acetone 28% under visible light conditions, the 0.5wt% La-TiO2 can mostly remove NO 93% and acetone 38% under the same conditions. Furthermore, the coating was designed to create more reaction contact surfaces interior while the lanthanum-doped titanium dioxide photocatalytic were constructed to facilitate surface charge carrier separation. The mechanisms for the improvement of the photocatalytic performance of the composites were discussed on the basis of the results. At last, the cost of as-prepared sample were be calculated as 13.4 NT per gram and P25 were 5.8 NT per gram. Complementary, the cost of as-prepared sample photocatalytic filter were be 182.3 NT each piece. Even the cost of as-prepared sample was higher than P25 2 times, but in the degradation of acetone or nitric oxide were better than P25.