题名

製備鑭及氮摻雜改質二氧化鈦降解空氣中NOx之研究

并列篇名

Study on preparation of lanthanum and nitrogen doped modified titanium dioxide for degradation of NOx in air

DOI

10.6840/cycu201600699

作者

張家偉

关键词

氮氧化物 ； 溶膠凝膠法 ； 二氧化鈦 ； 光催化 ； NOx ； sol-gel method ； titanium dioxide ； photocatalytic

期刊名称

中原大學生物環境工程研究所學位論文

卷期/出版年月

2016年

学位类别

碩士
导师

王雅玢;游勝傑
内容语文

繁體中文
中文摘要

氮氧化物主要源於工廠製程排放以及汽機車排放，通常是直接排放到大氣環境中，對於人體也有致癌的風險，然而氮氧化物也是最難處理的大氣汙染物之一，所以對於氮氧化物的去除一直是最受關注的議題之一。 本研究利用溶膠凝膠法製備鑭及氮摻雜二氧化鈦，分別進行不同摻雜比例、不同鍛燒溫度、不同鍛燒時間、不同環境濕度及穩定性測試，找出催化劑之最適合條件，最後再利用不同的特性分析來解釋鑭及氮摻雜二氧化鈦具有比純二氧化鈦較優之光催化活性。 結果顯示，鑭摻雜二氧化鈦在質量比為La-3%具有最佳之光催化活性，可見光降解效率為32.0%，模擬太陽光降解效率為38.5%，氮摻雜二氧化鈦在質量比為N-63.3%具有最佳之光催化活性，可見光降解效率為25.6%，模擬太陽光降解效率為39.3%。鑭及氮摻雜二氧化鈦在鍛燒溫度為500ºC及鍛燒時間為5h具有最佳光催化活性。在不同環境濕度實驗中，鑭及氮二氧化鈦在可見光下降解NO效率下降，而在模擬太陽光下降解NO效率提高，但會產生大量NO2氣體。在穩定性測試中，鑭及氮二氧化鈦在可見光下經過5次測試，效率分別仍有23.4%及17.9%；在模擬太陽光下效率也仍有40.2%及35.2%。
英文摘要

The main source of NOx is emission from factories and automobiles. NOx is usually emitted to the atmosphere which causes risk of cancer in human; thus, making it one of the most important pollutants to be removed from the atmosphere. However, NOx is also one of most difficult pollutants in the atmosphere to process and eradicate. In this study, lanthanum and nitrogen was doped individually with titanium dioxide and prepared using sol-gel method. The tests of different doping ratio, different calcination temperature, different calcination time, different environment humidity and stability was investigated to find the best condition in making an effective catalyst. Finally, different characteristic analyses were used to reveal that lanthanum and nitrogen doped titanium dioxide has better photocatalytic activity than pure titanium dioxide. The results showed that lanthanum doped titanium dioxide showed its best photocatalytic activity with mass ratio of 3%, the visible light activity and simulated solar light activity was 32.0% and 38.5%, respectively. Nitrogen doped titanium dioxide had its best photocatalytic activity with mass ratio of 63.3%, the visible light activity and simulated solar light activity was 25.6% and 39.3%, respectively. The lanthanum and nitrogen doped titanium dioxide had the best photocatalytic activity in calcination temperature of 500 ºC and calcination time of 5 h. In the experiment of different environment humidity, the efficiency of lanthanum and nitrogen doped titanium dioxide in removing NO under visible light decreased. The efficiency of lanthanum and nitrogen doped titanium dioxide in removing NO under simulated solar light increased and produced large of NO2. In the experiment of stability test, the efficiency of lanthanum and nitrogen doped titanium dioxide in removing NO under visible light was 23.4% and 17.9%, respectively after five cycles. The efficiency of lanthanum and nitrogen doped titanium dioxide in removing NO under simulated solar light was 40.2% and 35.2%, respectively after five cycles.
主题分类 工學院 > 生物環境工程研究所
生物農學 > 森林
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