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題 名 | 2-Chlorophenol Oxidation by Ultrasound/H[feaf]O[feaf]in Aqueous Solution: Models and Kinetics=超音波/H[feaf]O[feaf]程序分解2-氯酚 |
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作 者 | 林志高; 馬英石; 吳哲仁; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 22:5 1998.09[民87.09] |
頁 次 | 頁660-669 |
分類號 | 445.25 |
關鍵詞 | 超音波; 分解; 2-氯酚; 水; 2-chlorophenol; First-order reaction; Intermediate; Ultrasound; |
語 文 | 英文(English) |
中文摘要 | 本研究以超音波法對水中2-氯酚之分解及總有機碳的去除進行探討。根據實驗結 果顯示,2-氯酚的分解主要依循一階反應模式,當溶液之ph值低於2-氯酚之酸鹼解離常數 時,2-氯酚較易被氧化分解。當初始pH值調整於3並添加200mg/L之過氧化氫,於2-氯酚 之初始濃度為100mg/L,反應360分鐘後,2-氯酚之分解率可達99%,總有機碳之去除率則 為63%。提高溶液之離子強度時,對有機物之氧化分解亦具正面效果;有機物之初始濃度 越低,2-氯酚之分解速率越快;催化劑如硫酸亞鐵、氧化鐵╱氧化鋁以及過氧化氫的添加可 使溶液中之氫氧自由基之濃度增加,並提高2-氯酚之氧化分解率,但其中以添加過氧化氫 的效果最為明顯。於超音波/H□O□對2-氯酚進行氧化反應時,可以水樣中偵測到hydroquinone 以及2-chloro-p-benzoquinone兩種中間產物的生成。 |
英文摘要 | The effect of varying reaction parameters on the decomposition of 2-chlorophenol (2-cp) and removal of total organic carbon (TOC) using the ultrasound/ H□O process was investigated. The decomposition of 2-cp was found to be a first-order reaction. The experimental results showed that decomposition of 2-cp using the ultrasound/ H□O□ process was more effective than that using the ultrasound or H□O□alone. At pH 3, the efficiency of 2-cp decomposition was better than 99%, but that of TOC removal was only 63% after 360 min of reaction. We detected two intermediate compounds, i.e,. 2-chloro-hydroquinone and 2-chloro-p-benzoquinone, during the reaction. With increasing ionic strength, the extent of 2-cp decomposition was remarkably enhanced. However, the removal of TOC was found to be nearly independent of the ionic strength. The extent of 2-cp decomposition was also enhanced by the addition of catalysts (FeSO□ or Fe□O□/Al□O□), but this effect was insignificant compared with that of the addition of H□O□. The extent of 2-cp decomposition at a small initial concentration of 2-cp was more rapid than that at a greater one concentration. |
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