複合態觸媒光催化降解四氯酚

• Main Authors: Chung-Nan Weng, 翁宗男
• Other Authors: Cheng-Fang Lin
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/95942737289456505886

碩士 === 國立臺灣大學 === 環境工程學研究所 === 92 === 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.