| Summary: | 碩士 === 國立暨南國際大學 === 土木工程學系 === 100 === In this study, we developed binary metals modifying titanium dioxide with two steps by using sol-gel method and hydrothermal treatment. In order to doped the transformation metal Cu and Fe in the lattice of TiO2. And then deposition the noble metal Ag it.
In the result of SEM and TEM, the grain size of about 20~30 nm. After XRD analysis, the silver deposition on the surface of Photocatalyst might be Ag0. All the TiO2 was existed as anatase. The result of Zeta potential shows that the surface charge on the all kinds of TiO2 in this study was decreased with the increasing of pH, and the pHiep of Ag(10 wt%)/Cu(0.01 %)-TiO2, Ag(10 wt%)/Fe(0.01 %)-TiO2, Cu(0.01 %)-TiO2, Fe(0.01 %)-TiO2 and TiO2 was 5.1、4.8、6.3、5.5 and 7. In the result of Uv/vis analysis, the band edge wavelength of doping modifying TiO2 was higher than pure TiO2, and the visible light absorption of the binary metals modifying TiO2 was increased obviously.
In this study, the photocatalytic efficiency of binary metals modifying TiO2 was higher than doping modifying TiO2 and pure TiO2 plainly. Under the visible light of 430 nm irradiation, the decolorization rate of Methylene Blue was 100 % in 10 minute by using binary metals modifying TiO2. Under the same light source the decolorization rate of Methylene Blue was 34 % and 31 % in 18 hours by using Cu or Fe doping TiO2. Under three kinds of visible light source irradiation, the photocatalytic efficiency to MB of binary metals modifying TiO2 increased with the decreasing of light source wavelength as 430 nm blue>LED blue >LED yellow.
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