| 研究生: |
魏豪正 Wei, Hao-Cheng |
|---|---|
| 論文名稱: |
草酸於異相光催化系統降解偶氮染料之研究 Study on the heterogeneous photocatalytic system by using oxalic acid for the degradation of azo dye Reactive Black 5 |
| 指導教授: |
陳志勇
Chen, Chih-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 139 |
| 中文關鍵詞: | 異相催化 、吸附 、鐵氧化物 、偶氮染料 |
| 外文關鍵詞: | Iron oxide, heterogeneous catalysis, azo dye, adsorption |
| 相關次數: | 點閱:114 下載:1 |
| 分享至: |
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摘要
本研究主要分兩大部份,第一部份結合光源、鐵氧化物B1觸媒與草酸處理反應性偶氮染料Reactive Black 5,稱為異相Photo-Fenton法。此法利用草酸於開光及有氧系統會氧化成氫氧自由基之特性來降解偶氮染料。研究內容包括:背景實驗、pH值、草酸加藥量之探討、溶鐵量研究。並針對系統差異做TOC分析,進行有氧、無氧狀態之影響探討與觸媒重複利用之研究等。
實驗結果顯示染料降解反應的最適操作條件是pH值為5、草酸加藥量為30 mg/L,處理結果顯示染料脫色程度與礦化指標分別達90 %與40 %左右,此外,研究顯示溶液在曝空氣的有氧狀態下比曝氮氣的無氧狀態有更快的降解染料速率,最後依此結果來推測出反應機制。
第二部份進行B1觸媒吸附草酸之動力研究,由染料降解實驗中發現B1觸媒和草酸能有效錯合,會進行染料與草酸彼此之間的競爭吸附,影響異相Photo-Fenton法處理效果,主要探討吸附動力之模式,操作變因包括:背景電解質、pH值、溫度、B1觸媒量。
動力實驗結果顯示最佳操作條件為pH控制於5,觸媒量為20 g/L且背景電解質不會影響反應結果,此時觸媒吸附草酸系統符合二階動力吸附模式。
Abstract
This study is composed of two parts. The first was the application of heterogeneous photo-catalysis system by introducing into light source, B1 catalyst, and oxalic acid to degrade the azo dye Reactive Black 5(RB5), which is known as the Photo-Fenton method. The oxalic acid was able to produce hydrogen radical by itself in the light system and thereby degrade RB5. The contents of this part include:background experiment, pH effect, the dosage of oxalic acid, the effect of soluble iron, etc. In light of the characteristics of this system, some tests as TOC analysis, the experiment with air or nitrogen and recycle catalyst were also done.
From the first part, it indicated that the optimal situation takes place when the pH value was 5 and the dosage of oxalic acid was at 30 mg/L. As a result, about 90 % de-colorization was measured and 40 % mineralization was eliminated at pH 5 in the presence of 10 g/L B1, 30 mg/L oxalic acid, and a light under 15W UVA. Besides, it had faster degradable rate in the system with air than it did in the nitrogen system. According to these results, we could infer the mechanism as to how those were reacted to each other.
In the second part of this study, the experiment of adsorption was discussed. It was found that oxalic acid was easily adsorbed by the surface of B1 catalyst. Therefore, some experiments were done in search of the balance between dynamics and thermodynamics. Due to the fact that the dyestuff and oxalic acid will complete for adsorption, the effect of the Photo-Fenton method were greatly influenced. In this part, the effect of electrolyte, pH value, temperature, the dosage of B1 catalyst and dynamic models are important parameters.
Our research shows that the best operational condition was set at pH 5 when the dosage of catalyst was at 20 g/L and the electrolyte could not interfere with the result. The system confirms the Pseudo-Second order model.
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