| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系碩士在職專班 === 103 === The modification of titanium dioxide(TiO2) was prepared via the precipitation method of mass production in this study. In order to decrease the energy gap of TiO2, which were doped transition metal Fe and Ag ions to improve process . Furthermore, the adsorption of TiO2 surface Ag+ ion reduce to nanoparticle (Ag) by Chemical reduction method. The adsorption surface TiO2 of electric conductivity metal could enhance electron-hole pair separately, and delay the electron-hole pair of carrier recombination rate. So that could obtain semiconductor photocatalyst co-doped Ag and Fe.
Iron (Fe) doped, Sliver (Ag), and co-doped Ag and Fe ions TiO2 nanoparticles were characterized by Inductively Coupled Plasma-Atomic Emission(ICP-AES), Wide Angle X-ray Diffraction (WAXD). The morphology of synthesized product was observed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometer (EDS). The specific surface area was measured with N2 adsorption/desorption. The photocatalytic activity of synthesized product (metal doped TiO2) was evaluated by measuring the degradation of methylene blue (MB) under UV irradiation. The change of MB concentration was measured by Ultraviolet and Visible Spectroscopy (UV-VIS).
The results show that the modification titanium dioxide (single metal doped-TiO2) specific surface area double higher than pure TiO2. The influence of decreasing photocatalytic activity with doping metal concentration to enhance Shielding effect. Instead, the co-doped (Fe and Ag) ions TiO2 are not only high specific surface area but also with absorptive decomposition fast. Therefore, decomposition methylene blue in aqueous solution still have better absorption and photocatalytic activity.
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