TiO2 and TiO2/SiO2 nanoparticles were prepared by controlled hydrolysis of titanium tetraisopropoxide and tetraethylorhtosilicate in water-in-carbon-dioxide microemulsion using ammonium carboxylate perfluoro-polyether (PFPE-NH4) as a surfactant. These particles were characterized by HRTEM, XRD, FT-IR, TGA and DTA. The particles calcined at 500 degrees C were identified as a nanocrystalline anatase phase, regardless of the titanium tetraisopropoxide/teraethylorthosilicate (TTIP/TEOS) molar ratio. The crystallite size decreased with an increase of the silica content. From FT-IR analysis, the band for Ti-O-Si vibration was observed and the band intensity for Si-O-Si vibration increased with an increase of the silica content. The micrographs of HRTEM showed that the TiO2/SiO2 nanoparticles had a spherical morphology with a narrow size distribution and the lattice fringe was 0.35 nm; which corresponds to the lattice spacing of (101) plane in the anatase phase. In addition, TiO2/SiO2 particles showed higher photocatalytic activity than pure TiO2 and the TiO2/SiO2(80 : 20) particles showed the highest activity on the photocatalytic decomposition of p-nitrophenol.
机构:
Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South KoreaKorea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea
Jang, HD
Kim, SK
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机构:Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea
Kim, SK
Kim, SJ
论文数: 0引用数: 0
h-index: 0
机构:Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea
机构:
Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South KoreaKorea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea
Jang, HD
Kim, SK
论文数: 0引用数: 0
h-index: 0
机构:Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea
Kim, SK
Kim, SJ
论文数: 0引用数: 0
h-index: 0
机构:Korea Inst Geosci & Mineral Resources, Div Mat Dev, Taejon 305350, South Korea