Synthesis of TiO2/SiO2 nanoparticles in a water-in-carbon-dioxide microemulsion and their photocatalytic activity

被引:20
作者
Lee, MS
Lee, GD
Park, SS
Ju, CS
Lim, KT
Hong, SS
机构
[1] Pukyong Natl Univ, Div Appl Chem Engn, Pusan 608739, South Korea
[2] Pukyong Natl Univ, Div Image & Informat Engn, Pusan 608739, South Korea
关键词
nanosized TiO2/SiO2 particles; water-in-carbon-dioxide microemulsion; PFPE surfactant; photocatalytic decomposition;
D O I
10.1163/1568567053956626
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:379 / 389
页数:11
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