title: Synthesis and photocatalytic activity of TiO2 nanoparticles prepared by chemical vapor condensation method with different precursor concentration and residence time.
abstract: Nanosized TiO(2) photocatalysts were synthesized using a chemical vapor condensation method under a range of synthesis conditions (precursor vapor concentration and residence time in a tubular electric furnace). X-ray diffraction showed that the prepared TiO(2) powders consisted mainly of anatase (>94%) with a small amount of rutile. The mean particle diameter from the Brunauer-Emmett-Teller surface area and transmission electron microscopy measurements ranged from 9.4 to 16.6 nm. The specific surface area (92.5-163.5 m(2) g(-1)) of the prepared TiO(2) powders was found to be dependent on the synthesis conditions. The content of hydroxyl groups on the surface of the prepared TiO(2) sample was higher than those on commercial TiO(2), resulting in increased photocatalytic oxidation. The photocatalytic activity of the TiO(2) samples prepared in a methylene blue solution was strongly dependent on the crystallinity and specific surface area, which were affected by the TTIP vapor concentration and residence time.
authors.affiliation: Environment Division, Korea Institute of Science and Technology (KIST), 39-1, Hawolgok, Seongbuk, Seoul 136-791, Republic of Korea.
authors.forename: Sungmin
authors.initials: S
authors.lastname: Chin
authors.forename: Eunseuk
authors.initials: E
authors.lastname: Park
authors.forename: Minsu
authors.initials: M
authors.lastname: Kim
authors.forename: Gwi-Nam
authors.initials: GN
authors.lastname: Bae
authors.forename: Jongsoo
authors.initials: J
authors.lastname: Jurng
mesh_terms: D002384:Catalysis; D008722:Methods; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D055668:Photochemical Processes; D011208:Powders; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D011208:Powders; C009495:titanium dioxide; D014025:Titanium