Preparation and Photocatalytic Activity of ZnO Supported on Carbon Nanotubes
| Autor: | Chih-Hsuan Wu, 吳至軒 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In this thesis, the purpose of this study is to prepare ZnO supported on carbon nanotubes(CNTs) and to apply it on photocatalytic reaction. The catalysts were tested by quartz glass reactor under the UV light illumination. The parameters of catalyst preparation include the temperature of calcination, acid-treatment of carbon nanotubes,diameter of CNTs,ratios of CNTs to ZnO, solvent, concentration of precursor solution, ultrasonic power and preparation time. Operating conditions in photocatalytic reaction included initial concentration of methyl orange solution, wavelength illumination and photodegradation of methylene blue. The results revealed that the catalyst prepared by precipitation method, and calcination of temperature at 400℃ enhanced the conversion of methyl orange solution. The amount of CNTs at 25% enhanced activity and dispersion of catalyst. Adding the 10-20 nm of CNTs for support can make catalyst obtain large surface. Under the UV light illumination, methyl orange solution converted 90.1%. The catalyst prepared by the ultrasonic power under 100W for 2 hours, the ZnO crystal size was about 24.5 nm. The catalyst of ZnO(75)/CNT(25) was used to proceed the photocatalytic reaction. Photodegradation of the methel orange solution under irradiation of UV light (306 nm), the conversion of methyl orange solution was 93% in 90 min, and the rate constant 3.4 times to commercial catalyst. Photodegradation of the methel blue solution under irradiation of UV light (365 nm), the conversion of methyl blue solution was 98.2% when reaction time in 90 min. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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