Study on the surface properties and electrocatalytic effects of transition metal-doped catalytic electrode
| Autor: | Shan-Yi Shen, 沈善鎰 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 The subject of this study is to manufacture the titanium dioxide catalytic electrode by using the Sol-gel method with dipped coating. The additional of vanadium transition metal with different concentration was used to achieve the catalyst surface modification, which mole ratio of V/Ti is 0.05, 0.10, and 0.30, respectively to find out the relatively appropriate doped ratio for the electrocatalytic system. All catalytic electrode was characterized by field emission scanning electron microscope (FE-SEM), high resolution X-ray diffractometer (HRXRD), electron spectroscope for chemical analysis (ESCA), specific surface area analyzer (BET), UV/Vis spectrophotometer (UV/Vis), and electrochemical analyzer. Moreover, the all catalytic electrode was employed to test the removal efficiency of azo dye Acid Red 27 wastewater. The character analysis shows the better surface structure on the 0.10 VT catalytic electrode. It can be shown that catalytic particles arrange regular and uniform according the images of FE-SEM. The anatase crystallization mostly based to the analysis of HRXRD and the best specific surface area is 96 m2 g-1. It is demonstrated that modified electrode not only has vanadium doped in the catalytic surface, but also reduce its energy gap effectively. The electrocatalytic experiment for treating AR 27 wastewater, the different catalytic electrode was employed as anodes, while the graphite served as cathode. As a result, the larger electrode gap is favored on the TOC removal, and 6 cm is the appropriate distance; the 0.10 VT has better mineralization efficiency than other electrodes which could reached to 66% on 20 mA cm-2. The removal efficiencies of color and TOC have positive effect when the current density increased from 10 to 25 mA cm-2. Compared to un-modified electrode, vanadium modified electrode can reduce the energy consumption effectively and improve current efficiency for remove pollutants. Moreover, the electron-hole pairs effectively separated by adding vanadium transition metal, led to the produce of strong oxidants which enhance degradation efficiency of pollutant. In this study, the electrocatalytic reaction of color and TOC conform to the pseudo first order and zero order of kinetic model, respectively. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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