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題名 | 光分解水中1-氯苯反應行為之研究=Decomposition Behavior of Chlorobenzene in Aqueous by Photocatalytic System |
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作者 | 莊連春; 曾迪華; | 書刊名 | 中國環境工程學刊 |
卷期 | 7:2 1997.06[民86.06] |
頁次 | 頁119-132 |
分類號 | 445.259 |
關鍵詞 | 光催化; 高級氧化程序; 氯苯; 反應速率; 二氧化鈦; 反應機制; Photocatalytic; AOPs; Chlorobenzene; Reaction rate; TiO[feaf]; Reaction mechanism; |
語文 | 中文(Chinese) |
中文摘要 | 高級氧化處理程序對於毒性有機污染物,具有相當良好之處理能力,本研究以UV╱H�烙�砥�TiO�砲�催化系統,利用環狀光反應器進行實驗操作,實驗結果顯示分解1-氯苯 (Monochlorobenzene,MCB)之反應速率常數隨著pH值之增加而遞減;又反應物起始濃度越高,MCB分解速率常數下降愈多;在簡化之兩階段反應速率常數之探討,氯苯分解速率常數隨pH值及TiO�租K加量之增加而顯著地下降,脫氯速率常數則變化不大;此外,在本系統中鑑定出C�烙�略坐介〞姿堙A至於各類型含碳濃度之變化,發現NPOC減少速率在高添加TiO�紋窄q下有趨緩之現象,且pH值愈高,中間產物之去除速度愈慢;另本研究以EE╱O值(Electrical energy per order)表示操作系統對電能之需求,發現在少量之TiO�租K加量及酸性條件下可得最小之EE╱O。 |
英文摘要 | The presence of toxic chemicals in waste liquid can be decomposed by advanced oxidation processes (AOPs). This research used the UV/H�烙��/TiO�� system to perform experiments in a cylinder reactor. The experimental results indicated that monochlorobenzene (MCB) decomposition rate constant decreased with increased pH and initial MCB concentration. Accoring to this study, the kinetics of the reaction pathway can be assumed to be a simplified two-step-reaction. The MCB degradation rate constant significantly decreased with increasing pH and TiO�� feeding dosage, but the MCB dechlorination rate constant remained almost the same for all operation conditions. Additionally, this study identified the intermediate, C�烙��, in the photocatalytic reaction and also measured the different kinds of carbon within the reaction time. It showed that the removal rate of non-purgeable organic carbon (NPOC), which represents the quantity of intermediates, was retarded at high TiO�� feeding dosage and that the removal rate of intermediates was slowed down at high pH. This research also used EE/O value (Electrical energy per order) to point out the electrical requirement of the operating system and found that there was a minimum EE/O value with a small quantity of TiO �� feeding dosage under acidic conditions. |
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