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Direct Formation and Photocatalytic Performance of Anatase (TiO 2 )/Silica (SiO 2 ) Composite Nanoparticles
Author(s) -
Hirano Masanori,
Ota Keisuke
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01567.x
Subject(s) - photocatalysis , anatase , crystallinity , nanoparticle , composite number , methylene blue , materials science , hydrolysis , chemical engineering , hydrothermal circulation , sol gel , inorganic chemistry , nuclear chemistry , chemistry , nanotechnology , catalysis , composite material , organic chemistry , engineering
Anatase (TiO 2 )/silica (SiO 2 : 23.9–27.7 mol%) composite nanoparticles were directly synthesized from (i) the reaction of titanyl sulfate (TiOSO 4 ) and sodium metasilicate (Na 2 SiO 3 ) under mild hydrothermal conditions, (ii) the acidic precursor solutions of TiOSO 4 and tetraethylorthosilicate (TEOS) by thermal hydrolysis, and (iii) the metal alkoxides, i.e., tetraisopropoxide (TTIP) and TEOS, by the sol–gel method. Their photocatalytic activities were evaluated by measurements of the relative concentration of methylene blue after UV irradiation. The as‐prepared TiO 2 /SiO 2 composite nanoparticles showed far more improved photocatalytic activity than the pure anatase‐type TiO 2 . The composite nanoparticles formed from (i) TiOSO 4 and Na 2 SiO 3 as well as those from (ii) TiOSO 4 and TEOS showed fairly good photocatalytic activity, and it was better than that of those synthesized from (iii) the metal alkoxides, which was suggested to be due to the difference in crystallinity of the anatase.