磁性光催化剂Fe3O4/SiO2/TiO2的蒸汽相水解法制备及光催化性能
首发时间:2014-01-15
摘要:采用蒸汽相水解法,以Fe3O4纳米磁性颗粒为磁核,在其表面包覆一层二氧化硅来阻止光腐蚀,然后将锐钛矿相纳米氧化钛沉积在Fe3O4/SiO2颗粒表面,从而制得核壳结构的Fe3O4/SiO2/TiO2磁性复合光催化材料。用X射线粉末衍射(XRD)仪,场发射扫描电镜(FE-SEM),高分辨率透射电子显微镜(HR-TEM),探针式震动磁强计等手段对所制备的产物的结构、形貌、磁强度性能进行表征。以300W汞灯为光源亚甲基蓝和酸性红为模拟污水中有机染料评价复合光催化剂的性能。结果表明磁性纳米微球中TiO2的含量越大其光催化性能越好,含TiO2 50wt%的F3O4/SiO2/TiO2磁性纳米微球可在180分钟内降解亚甲基蓝模拟染料废水,降解率达99%,在80分钟内降解酸性模拟染料废水,降解率达98%。
关键词: 蒸汽相水解 Fe3O4/SiO2/TiO2磁性纳米微球 光催化
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Preparation of magnetic photocatalyst Fe3O4/SiO2/TiO2 and vapor-phase hydrolysis photocatalytic properties
Abstract:Anatase TiO2 nanoparticles were deposited on the composite Fe3O4/SiO2, where Fe3O4 acted as the magnetic core and SiO2 acted as the protective coating against the photo corrosion of Fe3O4. Thus, the multi-layer composite of Fe3O4/SiO2/TiO2 were obtained. X-ray powder diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HR-TEM), vibrating magnetometer probe by means of the prepared product structure, morphology, magnetic characterization. With 300W mercury lamp as a light source, both methylene blue and acid red were used to simulate organic wastewater, the composite catalytic properties of visible light photocatalyst were evaluated. The results show that the greater the magnetic nanoparticles in TiO2 content, the better the photocatalytic properties, Fe3O4/SiO2/TiO2 magnetic nanospheres containing TiO2 50 wt% degraded of 99% of methylene blue dye in wastewater for 180 minutes while it degraded 98% of acid red G in the simulated wastewater under irradiation for 80 minutes.
Keywords: Vapor-phase hydrolysis;Fe3O4/SiO2/TiO2 magnetic nanospheres;Photocatalytic
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磁性光催化剂Fe3O4/SiO2/TiO2的蒸汽相水解法制备及光催化性能
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