Study of facet-dependent properties of silver oxide nanocrystallines: Photocatalytic degradation of dyes

• Main Authors: Jen-Hung Yang, 楊仁宏
• Other Authors: SZETSEN STEVEN LEE
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/5x3e7h

碩士 === 中原大學 === 奈米科技碩士學位學程 === 103 === This study discussed the synthesis of silver oxide of different morphologies and different band gaps as the photocatalyst for photodegradation. By adjusting the synthesis parameters of silver oxide, the morphologies and band gaps changed. In this study, the photocatalyst degradation experiment was carried out with dyes (methyl orange, methylene blue) of different electric properties and by changing the dye concentration. Different initial concentrations were used to observe the difference of degradation capacity under the same morphology of catalyst by measuring the change of characteristic peak of UV-vis absorption spectrum. The change of degradation was discussed with different shapes of silver oxide under the same initial concentration. Kinetic model was used to discuss the difference of surface reaction rate constant between different morphologies and the size of catalyst surface adsorption constant, and analyze the relation of different crystal faces and band gaps with the dye decomposition rate. The results showed that in different morphologies (cube, octahedral, rhombicuboctahedra and hexapods), the cube has the largest rate constant, with catalysis effect, while octahedral has relatively poor catalysis effect. The rate constant and catalysis effect in different morphologies were also discussed in this thesis.