Enhance the Photocatalytic Activity of Titanium Dioxide by Silver Nanostructures
Date Issued
2014
Date
2014
Author(s)
Lee, Ti
Abstract
Phtocatalysis phenomenon of titanium dioxide (TiO2) has been widely investigated due to its potential application in degradation of pollutant and production of hydrogen. However, because of the large band gap, TiO2 shows low photocatalytic activity under the irradiation of the visible light. Constructing the hybrid system of noble metal nanostructures and TiO2 is one known way to enhance the photocatalytic activity of TiO2 under visible light irradiation. In our study, three kinds of silver nanostructures were synthesized: nanospheres with smaller size (5-15 nm), nanospheres with larger size (15-40 nm) and nanoprisms (~75 nm). While silver nanospheres were synthesized by the chemical reduction method, silver nanoprisms were synthesized by the following photo conversion process. The slurry was made by mixing silver solution with commercial TiO2 powder (P25) with certain weight percentage. It was then used as the photocatalyst to degrade the methylene blue solution, which is the assumed pollutant in our study. We found that silver nanostructures can enhance the TiO2 photocatalytic activity and the enhancement is a function of the shape and the size of nanostructures. The enhancement of the photocatalytic activity of these hybrid system might be attributed to the localized surface plasmon resonance (LSPR) of silver nanostructures. The formation of electronic state on the interface between semiconductor and metal nanoparticles might also help charge separation, which reduces the recombination rate of electrons and holes.
Subjects
二氧化鈦
光觸媒
奈米銀
Type
thesis
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