• 作者： 林志高; 馬英石; 吳哲仁
• 作者服務機構： 國立交通大學環境工程研究所
• 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100 mg/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/H2O2對2-氯酚進行氧化反應時，可於水樣中偵測到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 removalof total organic carbon (TOC) using the ultrasound/H202 process was investigated. The decompositionof 2-cp was found to be a first-order reaction. The experimental results showed that decomposition of2-cp using the ultrasound/H2O2 process was more effective than that using the ultrasound or H2O2 alone.At pH 3，the efficiency of 2-cp decomposition was better than 99%, but that of TOC removal was only63％ after 360 min of reaction. We detected two intermediate compounds, i.e.，2-chloro-hydroquinoneand 2-chloro-p-benzoquinone, during the reaction. With increasing ionic strength, the extent of 2-cpdecomposition was remarkably enhanced. However, the removal of TOC was found to be nearly independentof the ionic strength. The extent of 2-cp decomposition was also enhanced by the addition of catalysts(FeSO4, or Fe2O3/Al2O3), but this effect was insignificant compared with that of the addition of H2O2.The extent of 2-cp decomposition at a small initial concentration of 2-cp was more rapid than that at agreater one concentration.
• 中文關鍵字： 2-Chrmediate; first-order reaction; intermediate; ultrasound
• 英文關鍵字： --