Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5148
標題: 以CVD法製備二氧化鈦光觸媒去除水溶液中2,4-二氯酚之研究
Photocatalytical Degradation of 2,4-Dichlorophenol in Aqueous Solution on TiO2 Prepared by CVD Method
作者: 許瓊旭
Shiu, Chiung-Sh
關鍵字: Photocatalysis;光催化;Titanium dioxide;2,4-dichlorophenol;二氧化鈦;2,4-二氯酚
出版社: 環境工程學系所
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摘要: 
本研究以化學氣相沉積法製備二氧化鈦薄膜反應器,搭配365nm紫外光燈管進行2,4-二氯酚光催化反應之探討。
實驗系統採迴流批次方式進行,主要以pH值為控制變因,並以HPLC、IC、TOC、GC進行分析,探討2,4-二氯酚在不同酸鹼值情況下的光催化反應,並藉由中間產物的鑑定進一步推測2,4-二氯酚的降解反應途徑。
由光催化系統和直接光解系統結果顯示,在高pH值時2,4-二氯酚去除率表現最佳;添加二氧化鈦的光催化實驗,在三種pH條件中2,4-二氯酚去除率都比直接光解時效果好,其中在高pH值的光催化系統能得到最佳的2,4-二氯酚去除率。
另外,由光催化實驗結果顯示,UV/TiO2系統在三種pH值條件下對2,4-二氯酚的礦化效果不佳,主要作用機制仍以斷C-Cl鍵為主,破環的機率較小,絕大部分中間產物仍是以帶苯環有機物存留於溶液中。
根據簡化後的Langmuir-Hinshelwood公式可描述二氧化鈦光催化下2,4-二氯酚之反應動力模式,且在高pH環境中有較高反應速率。

The tube reactor deposited with TiO2 thin film inside by CVD method and a 365nm UV lamp were used in this investigation to study the reaction behavior of 2,4-DCP in heterogeneous photocatalysis.
The experiment equipment was a batch recycle system, and the major controlled parameter was pHs. The photocatalitical degradation of 2,4-DCP in different pH’s were studied with the analysis of HPLC、IC、TOC and GC, varied with reaction time , moreover, the reaction pathway was estmited by identifying the intermediates .
The results of the heterogeneous photocatalysis and direct photolysis showed the removal rate of 2,4-DCP was higher at high pH’s .With the addition of titanium dioxide , the removal rate would also increase at the three different pH’s . Totally , we could find the best removal rate of 2,4-DCP in heterogenous photocatalytical system at high pHs .
In the UV/TiO2 system , the major mechanism was for dechlorination ; breaking the ring and the mineralization of 2,4-DCP were rarely achieved . Most intermediates existed in the form of organic ring .
The photodegradation of 2,4-DCP would follow the simplified Lamgmuir-Hinshelwood kinetics , showing rate constant enchanced with the increasing of pHs .
URI: http://hdl.handle.net/11455/5148
其他識別: U0005-1307200616103000
Appears in Collections:環境工程學系所

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