| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 96 === The object of this paper will improve the magnetic photocatalyst by CTAB or PVA, because according the journal of magnetic photocatalyst indicate, the non-magnetic free type TiO2 particles could be produced during the process, the separation and recovery of non-magnetic free type TiO2 particles from water are difficult. The researches mainly restrain the non-magnetic free style TiO2 particles produce and also enhance the effect of TiO2 photocatalytic activities. The synthesized sample was characterized by XRD, FTIR, TGA, XRF, BET, SQUID, SEM, TEM. The photocatalytic activity of the synthesized composite particles was tested by photodegradation of Methyl Orange (MO) and Methylene Blue (MB) under UV illumination (250 nm) and compared with that of commerce photocatalyst P-25.
The result shows, the first part, adopt CTAB to become liquid crystal template to improve magnetic photocatalyst, successful restrain the non-magnetic free type TiO2 particle produce and the surface area have obvious increase. The prepared photocatalysts own the excellent photocatalytic activities and magnetic. Repeated cycles of decomposition of methylene blue in aqueous solution were experimentally confirmed. The second part, carbon coating of magnetic photocatalyst was successfully carried out by heating a powder mixture of poly(vinyl alcohol) and TiO2/SiO2/Fe3O4 under N2 gas flow at temperatures above 700 °C. Carbon coating of magnetic photocatalyst was found to give different merits for photoactive performance, quick adsorption of MO and MB into the carbon layer, decomposition of adsorbed MO and MB by TiO2 and prevention of the interaction of TiO2 with binder resin. Repeated cycles of adsorption and decomposition of methylene blue in aqueous solution were experimentally confirmed.
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