Photooxidation of iodide ion on some semiconductor and non-semiconductor surfaces |
| |
| Affiliation: | 1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China;2. Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, UK;1. Energy Technology Laboratories, Osaka Gas Co., Ltd., 6-19-9 Torishima, Konohana-ku, Osaka 554-0051, Japan;2. Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université Bordeaux, 87 Avenue Dr. A. Schweitzer, 33608 Pessac, France;1. Science and Technology on Surface Physics and Chemistry Laboratory, PO Box 718-35, Mianyang 621907, Sichuan, PR China;2. China Academy of Engineering Physics, PO Box 919-1, Mianyang 621900, Sichuan, PR China |
| |
| Abstract: | In 80% aqueous ethanol, TiO2 (anatase), ZrO2, ZnO, V2O5, Fe2O3 and Al2O3 photocatalyze the oxidation of iodide ion but CdO and CdS do not; the wavelength of illumination is 365 nm. However, Fe2O3 fails to bring in a sustainable photocatalysis in 60% aqueous ethanol. The photooxidation of iodide ion on TiO2, ZrO2, ZnO, V2O5 and Al2O3 in 60% aqueous ethanol was studied as a function of I−], amount of catalyst suspended, airflow rate, light intensity and solvent composition. The metal oxides examined show sustainable photocatalytic activity. Iodine formation is larger with illumination at 254 nm than at 365 nm. The mechanisms of photocatalysis on semiconductor and non-semiconductor surfaces have been discussed. Photocatalytic generation of iodine has been analyzed using a kinetic model. The photocatalytic efficiencies are of the order V2O5 > TiO2 > ZrO2 > ZnO > Al2O3 and V2O5 > TiO2 > ZrO2 > ZnO=Fe2O3 > Al2O3 in 60% and 80% aqueous ethanol. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
