自廢棄螢光粉回收稀土元素開發高值化可見光光催化產品(2年之第2年)
| 中文摘要 | 本研究為期兩年。第一年，本研究將市售鑭與回收鑭摻雜於TiO2中進行可見光光催化反應實驗，結果顯示，在市售鑭部分，於TiO2中摻雜3%的鑭可得到最高的光催化效率，其降解率為28.0%。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。 本研究第二年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。並且，我們還研究了不同濕度情況下，光催化陶瓷過濾片對丙酮和一氧化氮的降解有何影響。光催化降解丙酮存在環境濕度影響光催化效率的因子，改變濕度因子之光催化過濾片實驗中，以環境濕度10RH%具備最好的降解效果為46.7%，且隨著濕度的提升丙酮的降解效率跟著下降。光催化降解一氧化氮存在環境濕度影響光催化效率的因子，改變濕度因子之光催化過濾片實驗中，以環境濕度條件在60RH%為最好，降解效果為91.5%且二氧化氮的生成量為2.45ppb，然而濕度條件高於60RH%則出現水氣與光催化競爭的現象，導致光催化能力下降，同時開始產生大量的二氧化氮。 | ||
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| 中文關鍵字 | 光催化、螢光粉、鑭系元素 | ||
基本資訊
| 專案計畫編號 | EPA-106-XB08 | 經費年度 | 106 | 計畫經費 | 1199.544 千元 |
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| 專案開始日期 | 2017/01/01 | 專案結束日期 | 2017/11/30 | 專案主持人 | 游勝傑 |
| 主辦單位 | 回收基管會 | 承辦人 | 張寶璽 | 執行單位 | 中原大學 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
|---|---|---|---|
| 期末報告 | 106基管會期末報告_-_定稿.pdf | 7MB |
The preparation of high-value and visible-light-driven photocatalytic products by rare earth elements from waste fluorescent powder
| 英文摘要 | This study has continuely proceeded on photocatalytic application with TiO2 doping commercial La3+. To recycle rare earth metals (REMs) from used fluorescent powder and enhance the visible response of TiO2, La-doped TiO2 (La-TO) photocatalysis with visible-light-driven capacity for NO Removal was successfully synthesized via a facile sol-gel method followed by calcination. In the second year, to boost the immobilization of a photocatalyst on a proper support for further practical environmental application, La-doped TiO2 photocatalyst was firstly immobilized on a commercial ceramic filter with porous structure and high surface area. Immobilized La-doped TiO2 (La-TiO2) was applied for photocatalytic degradation of Acetone and NO at the ppb level under visible light region. It was found that 0.5wt% La doping into TiO2 exhibited an excellent photocatalytic performance. The photocatalytic removal efficiency of acetone and NO under visible light could reach up to 36.9% and 77.2% respectively, which were much higher than that of pure TiO2 (23.5% and 76.5%, respectively). Moreover, the resulting samples were characterized by various physicochemical characterization techniques including XRD, XPS, UV-vis DRS and EDS. The results show that La-TiO2 sol-gel could be uniformly immobilized on the ceramic filter by impregnation method and followed by a low-temperature calcination treatment process. The three-dimensional porous structure of ceramic air filter resulted in more adsorption sites and reaction contact between pollution gas and photocatalyst surface, which is superior to the powdered TiO2 catalyst on substrates or thin film deposited on glasses. In order to the further application, the effect of relative humidity on photocatalytic performance was discussed. The work will provide a new perspective for promoting large-scale environmental application of immobilized photocatalysts. | ||
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| 英文關鍵字 | Photocatalysis、 Phosphors powder、La-TiO2 | ||