請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5533
標題: 以CVD法製備TiO2光觸媒反應器去除水溶液中雙氯酚反應行為之研究
A Study on Immobized TiO2 Photocatalyst Prepared by CVD Method for Dichlorophenol Photodegration
作者: 陳筠樺
Chen, Yun-Hua
關鍵字: photocatalysis
光催化
dichlorophenol
chemical vapor deposition method
titanium dioxide
雙氯酚
化學氣相沉積法
二氧化鈦
出版社: 環境工程學系
摘要: 本研究是以化學沉積法製備二氧化鈦薄膜反應器配合365nm波長紫外燈管,進行雙氯酚化合物分解行為之探討。 實驗系統採迴流批次式,以HPLC及IC分析方法探討在不同pH值及初始濃度下,2,4二氯酚和2,6二氯酚去除率,並比較2,4二氯酚和2,6二氯酚,在初始濃度為10ppm、pH值為3條件下的去除率。 結果發現2,4二氯酚是一種較高揮發性氯酚化合物,在pH=3、50ppm條件下,揮發為20%左右;在吸附實驗中可發現在,高pH值時的吸附量幾乎為零;在直接光解實驗中,2,4二氯酚在高pH值下分解率較高;在光催化實驗中,只有在低濃度及低pH值下,降解率達50%以上;而2,6二氯酚在pH=3(10ppm,50ppm,100ppm)的揮發率為20%,在高pH值下幾乎沒有揮發量;在低pH值時發現有吸附量,但在pH>7就沒有吸附量,由實驗中發現揮發及吸附結果較不受濃度效應影響;在直接光解中,殘留率會隨著pH值下降而減少;在光催化實驗中,若將其數據與背景實驗相比較可發現,在高pH值下2,6二氯酚降解率較高;而濃度效應,則是濃度越小,降解率越高。 將2,4二氯酚及2,6二氯酚,在初始濃度為10ppm、pH=3下進行8小時的光催化分解,發現2,6二氯酚比2,4二氯酚降解效果好。最後根據簡化後的Langmuir-Hinshelwood來描述二氧化鈦光催化雙氯酚的反應模式符合擬一階反應速率(R2值在0.9以上)。
This investigation used a tube reactor deposited with TiO2 thin film inside by chemical vapor deposition(CVD)method and a UV lamp with 365nm to study the decomposition behavior of dichlorophenols in heterogeneous photocatalysis. The experimental equipment was a batch recycle system. The degradation and dechlorination at different initial concentration and pH for 2,4-DCP and 2,6-DCP was determined by HPLC and IC. Finally, the comparison of the degradation of 2,4-DCP and 2,6-DCP at low initial concentration and pH (10ppm、pH=3) was discussed. The results suggested that 2,4-DCP has high volatility. No significant adsorption was detected for the 2,4-DCP at high pH. In the presence of both TiO2 and UV light, 2,4-DCP at low initial concentration was found to degrade more than half after four hours at low pH. No significant volatilization and adsorption was detected for the 2,6-DCP at high pH, and these two behavior was not affected by initial concentration of reactant. When the pH increased or initial concentration of reactant decreased, the photodegradation rate of 2,6-DCP increased. The photocatalysis of 2,4-DCP and 2,6-DCP at low initial concentration of reactant (10ppm) and low pH (pH=3) was also studied. After eight hours of reaction time, it was found that the degradation effect of 2,6-DCP was better than 2,4-DCP, and the photocatalytic process of these two reactants can be fitted by a pseudo-first-order kinetic model.
URI: http://hdl.handle.net/11455/5533
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