Photocatalysis Activity and structure Properties of KTaO Series Photocatalytic Powders Prepared by Hydrothermal Method

• Main Authors: Shu-Hao Yang, 楊舒皓
• Other Authors: Wen-Ku Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/pw9r9p

碩士 === 國立東華大學 === 材料科學與工程學系 === 96 === Potassium tantalum oxide photocatalyst powders were synthesized by hydrothermal method and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and UV-visible spectrometer. The photocatalytic activity was evaluated by photo-degradation methylene blue under UV-C light irradiation. Furthermore, study the properties of KTaO series photocatalyst powders by washed it before annealing or not, different temperature, different KOH concentration and annealing time and so on. The diffraction pattern will influenced by annealing temperatue of powder. The K2Ta4O11 crystal structure will be formed, if the powder is deficient the potassium ion in the surface and annealed to 700℃. The KTaO3 crystal structure will be formed at 900℃ and increased with the annealing temperature obviously. The KTaO3 single phase will be produced under sufficient potassium ion surrounding the powders surface. The results revealed that the KTaO series photocatalyst powders will phase transformation from one phase to two phase under annealing reaction. The photocatalyst powders will be enhanced the photocatalytic activity under two phase coexist compared with one phase. In this research, the photocatalytic activity of powders will be strongly influence by the reaction annealing temperature. The high annealing temperature will induce the grain growth of photocatalyst and reduce the specific surface area.