| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 104 === Ag3PO4, with a band gap of 2.45 eV, shows excellent photocatalitc ability under visible light irradiation. Ag3PO4 was reported to integrate with magnetic materials for recycle use. Up to date, the combination of Fe3O4/ Ag3PO4 composite with graphene oxide (GO) was not found. Accordingly, a composite of Ag3PO4 and magnetic silica (Fe3O4@SiO2) was synthesized in this study, the resultant product Fe3O4@SiO2/Ag3PO4 was mixed with GO for investigating the photocatalytic activity of Fe3O4@SiO2/Ag3PO4/GO. First, the Fe3O4 nanoparticles prepared by co-precipitation method were dispersed a reverse microemulsion suspension containing tetraethyl orthosilicate (TEOS). Then, AgNO3 and Na2HPO4 were introduced into Fe3O4@SiO2 suspension for preparing Fe3O4@SiO2/Ag3PO4, followed by mixed with various amounts of GO. The as-prepared composites Fe3O4@SiO2/Ag3PO4/GO were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), confirming the magnetic Ag3PO4 were successfully combined with GO. The results indicate that the as-prepared composite exhibits higher visible-light photocatalytic activity toward methyl orange in aqueous solution compared with Fe3O4@SiO2/Ag3PO4, possible due to GO could suppress the recombination of electron-hole pairs. On the other hand, the magnetic photocatalyst Fe3O4@SiO2/Ag3PO4/GO could be easily collected from reaction mixture by a magnet. The magnetic composite Fe3O4@SiO2/Ag3PO4/GO is thought to be a potential photocatalyst for degrading dyes and pollutants under visible light.
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