| Summary: | 碩士 === 中原大學 === 生物環境工程研究所 === 104 === 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.
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