複合態觸媒光催化降解四氯酚
Date Issued
2004
Date
2004
Author(s)
翁宗男
DOI
zh-TW
Abstract
本研究主要目的為針對水溶液中之目標降解物四氯酚（4-Cholorophenol），進行光催化常用半導體催化效率的改善。所採用的半導體光觸媒包括單一態二氧化鈦（TiO2）、二氧化錫（SnO2）和三氧化鎢（WO3）以及複合態TiO2/SnO2和TiO2/WO3。
實驗中除TiO2、SnO2和WO3為現購外， TiO2/SnO2和TiO2/WO3均分別由檸檬酸鹽法（Citric Acid Complexing Method）和初濕含浸法（Incipient Wetness Method）製成。隨後，在進行TiO2/SnO2、TiO2/WO3複合態光催化效率實驗的同時，亦將其複合態作物理上的性質分析，包括了UV-Vis、SEM、XRD、ESCA（XPS）、BET。
複合態之物性分析方面，TiO2/SnO2之臨界波長為380 nm，有分相傾向，Ti和Sn的元素分子含量比例為95.32 %：4.68 %，比表面積為12.4 m2/g ；TiO2/WO3為475 nm，無分相傾向，Ti和W的元素分子含量比例為75.95 %：24.05 %，比表面積為37.1 m2/g。
催化實驗結果，除了SnO2、TiO2/SnO2之外，其餘的催化降解效率均是在低pH值（pH＝4）條件下擁有較佳去除效果。在波長為369 nm之TiO2/SnO2這組中，以單一態TiO2表現最佳，pH4時降解效率約95 %，原因是波長為369 nm之燈管很容易激發TiO2，造成其催化效率特別顯著；波長為435 nm之TiO2/WO3方面，以複合態TiO2/WO3表現最佳，pH4時降解效率約有73 %。
The objective of this study is to increase the photocatalytic activity of semiconductor photocatalysts for aqueous 4-Chlorophenol. These photocatalysts we used here were single titanium dioxide (TiO2), tin oxide (SnO2), tungsten oxide (WO3) and coupled TiO2/SnO2 and TiO2/WO3.
TiO2/SnO2 was made by Citric Acid Complexing Method and TiO2/WO3 was made by Incipient Wetness Method. Through some specialized analytic equipments such as UV-Vis、SEM、XRD、ESCA (XPS) and BET, we could analyze these combined semiconductor photocatalysts in order to get the information of physical properties.
In the results of physical analysis, the band edge wavelength of TiO2/SnO2 is 380 nm, Ti element : Sn element is 95.32 %:4.68 %, the surface area is 12.4 m2/g; the band edge wavelength of TiO2/WO3 is 475 nm, Ti element : W element is 75.95 %:24.05 %, the surface area is 37.1 m2/g.
In the results of photocalysis, except single SnO2 and coupled TiO2/SnO2, higher photodegradation efficiency of 4-CP was observed at lower pH values. In TiO2/SnO2, UV369 nm system, single TiO2 owned the better degradation efficiency of 4-CP, it’s 95 % at pH4. For TiO2/WO3, UV435 nm system, coupled TiO2/WO3 owned the best degradation efficiency, it’s about 73 % at pH4.
Subjects
光觸媒
光催化
二氧化鈦
四氯酚
複合態
二氧化錫
三氧化鎢
photocatalysts
coupled system
titanium dioxide
tungsten oxide
tin oxide
4-chlorophenol
photocatalysis
Type
thesis
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