| 研究生: |
陳禹鈞 Chen, Yu-Chun |
|---|---|
| 論文名稱: |
以Fe、V改質光觸媒觸理1,2-二氯乙烷之研究 |
| 指導教授: |
朱信
Chu, Hsin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 環境工程學系 Department of Environmental Engineering |
| 論文出版年: | 2005 |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 149 |
| 中文關鍵詞: | 改質光觸媒 、1, 2-二氯乙烷 、光分解 、溶膠凝膠法 、二氧化鈦 |
| 外文關鍵詞: | photodegration, Titanium dioxide, doping, 1,2-dichloroethane |
| 相關次數: | 點閱:86 下載:1 |
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本實驗為以自製光觸媒及添加Fe、V、Pd改質光觸媒處裡1,2-二氯乙烷,從TGA分析純TiO2的樣品中可以發現,自製純TiO2於30℃-170℃之間有一重大的重量損失,為H2O;198℃-378℃之間也有一重量損失,推測為NO3-的分解,及結晶水的分解,由吸放熱來看,並沒有明顯的變化,有可能是NO3-的放熱及結晶水的吸熱相互影響所造成,另外,500℃-570℃之放熱波鋒為無晶形的TiO2轉變成anatase,590℃-800℃的放熱波鋒則為anatase轉變為rulite所造成。
由純TiO2及改質後之TiO2光觸媒處理1,2-二氯乙烷之轉化率分析中可發現,Fe:V:Ti=0.0005:0.0025:1%的最佳,為85%,其次是Fe/Ti=0.001%,為71%,V/Ti=0.01%則為64%,而商用光觸媒P-25則是57%,最差的為自製純TiO2光觸媒。在不同水氣濃度下自製TiO2光觸媒處理1,2-二氯乙烷之轉化率分析實驗時可以發現當水氣小於10%(相對溼度)時,轉化率都為100%,但隨著水氣的增加,轉化率逐漸下降,當水氣濃度為70%(相對溼度)時,轉化率已降為26.82%,因此推測水氣會跟我們所處理的污染物1,2-二氯乙烷產生競爭性吸附,所以隨著水氣濃度的升高,污染物的轉化率也降低。由Fe/Ti=0.001%的動力實驗可得知,1,2-二氯乙烷吸附常數Ki大於H2O吸附常數Kio,因此1,2-二氯乙烷吸附能力大於H2O吸附能力,但在我們的實驗中水氣的濃度大於1,2-二氯乙烷的濃度很多,所以水氣的變化對活性的影響相對很大。再者,可以發現隨著溫度的增加,吸附常數都是隨的減小,這是因為光觸媒的吸附為放熱反應,所以隨著溫度增加而減小,而由Arrhenius equation得反應之活化能Ea=139.58kJ/mole,碰撞因子A=3533.3。
In this experiment , in order to improve the activity of the TiO2. We doped Fe , V and Pd into TiO2 to photodegrade1,2-dichloroethane.From the result of TGA, there is a great loss of weight between 30oC- 170oC. It may result from H2O. And from 198oC – 378oC there is another loss of weight ,it supposes t he dissolution of NO3- and crystal water. From exothermic and endothermic curve, we can find that there is no great change in the figure . It may result from the exothermic and endothermic reaction of dissolution of NO3- and crystal water. In addition, there is an exothermic peak between 500oC- 570 oC. It results from the change from to anatase, and the exothermic peak from 590oC-800oC should be the change of anatase to rulite.
The best 1,2-dichloroethane photodegration performance is the sample of Fe:V:Ti= 0.0005:0.005:1%. The performance is 85%. The following are Fe/Ti =0.001%, and V/Ti =0.01% . The performance of p-25 in the same situation is 57%. The photocatalytic performance decreases with the H2O concentration increasing. It would presume that H2O may make contention with 1,2-dichloroethane.
The experiment of kinetic behavior of 1,2-dichloroethane over the Fe/Ti=0.001% catalyst shows that the adsorptive poteatial of 1,2-dichloroethane is stronger than H2O. But the H2O concentration is more larger than 1,2-dichloroethane. The performance would decrease with the increasing of H2O, and obtained the activity energy Ea=139.6KJ/mol.
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