| 研究生: |
連雅棉 Lien, Ya-Mein |
|---|---|
| 論文名稱: |
紫外光活化過硫酸鹽氧化甲基第三丁基醚之研究 Ultraviolet Light-activated Persulfate Oxidation of MTBE in Water |
| 指導教授: |
邱成財
Chiou, Cary T. 林財富 Lin, Tsair-Fuh |
| 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: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 111 |
| 中文關鍵詞: | 化學氧化 、過硫酸鹽 、紫外光 、活化 、甲基第三丁基醚 |
| 外文關鍵詞: | chemical oxidation, persulfate, UV, activated, MTBE |
| 相關次數: | 點閱:91 下載:2 |
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現地化學氧化技術的過硫酸鹽 (persulfate) 會產生高反應性的硫酸根自由基 (SO4–•) 與氫氧自由基 (OH•),具有氧化有機污染物的能力。由於未活化的過硫酸鹽對有機污染反應速率很慢,無法在短時間內快速氧化有機物,因此本研究藉由紫外光活化過硫酸鹽以加速氧化甲基第三丁基醚 (MTBE)。研究使用254 nm和365 nm 波長的紫外光活化過硫酸鹽,並探討在不同pH系統和不同MTBE與氧化劑莫耳濃度比例系統,活化過硫酸鹽對MTBE之氧化反應動力。
實驗顯示254 nm UV可有效活化過硫酸鹽產生自由基,有效地去除破壞MTBE,在反應時間1小時內,40 %過硫酸鹽被消耗,MTBE的降解率為99.5 %。在活化過硫酸鹽氧化MTBE的系統中,隨著反應時間的增加,反應初期產生的氧化中間產物TBA與TBF會逐漸轉變為acetone,並且在反應時間50分鐘後,將53 %的MTBE礦化成CO2。根據實驗結果推測254 nm UV 活化過硫酸鹽/MTBE系統的反應動力為二階反應,且該系統的反應級數似乎不會受到系統pH明顯的影響。不同pH系統的反應動力也顯示,酸性環境條件下有較快的MTBE反應速率,可能是氫離子易催化過硫酸鹽產生SO4–•所導致。
365 nm UV活化實驗顯示,在反應時間1小時內,過硫酸鹽無明顯消耗現象,MTBE的降解率約為25 % ; 反應時間50分鐘後,系統約有21 % 的MTBE礦化。365 nm UV活化過硫酸鹽對於MTBE的氧化降解速率較慢,其反應速率符合可以用假一階反應動力描述。
Persulfate is one of the oxidants used in of in-situ chemical oxidation (ISCO) of groundwater contamaintion. The oxidant may produce sulfate radical (SO4–•) and hydroxyl radical (OH•) with high oxidation potential in the remediation techniques. Although the oxidation potential for the chemical is high, the kinetics is very slow under typical environmental conditions. Therefore, the objective of this work was to investigate the feasibility of enhancing the reaction rates of persulfate for the oxidation of methyl tert-isobutyl ether using ultraviolet (UV) light.
In this study, 254 nm and 365 nm UV were used to activate persulfate for oxidizing MTBE at different pH values. MTBE was easily degraded by the persulfate/UV254 system. Within 50 mins, 53% of MTBE was mineralized in the persulfate/UV254 system. The concentration of persulfate was decreased by 40 %, while that of MTBE was reduced by 99.5% within 1 hour in the 254 nm UV system. A second-order kinetic model well described the reduction of MTBE in aqueous solution. At lower pH, higher kinetic rate was observed for MTBE reduction.
For the persufate/UV365system, MTBE was resistant to degrade. Within 1 hr of reaction, very minor amount of persulfate decomposed, and only 25% and 17% of MTBE was degraded and mineralized, respectively. Unlike that in the persulfate/UV254 system, the degradation of MTBE for this case followed a pseudo-first-order reaction.
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