Preparation of TiO2 ultrafine nanopowder with large surface area and its photocatalytic activity for gaseous nitrogen oxides

Title
Preparation of TiO2 ultrafine nanopowder with large surface area and its photocatalytic activity for gaseous nitrogen oxides
Authors
진성민박은석김민수정주영배귀남정종수
Keywords
TiO2 nanopowder; nitric oxide; indoor air; photocatalytic; Photocatalytic oxidation; Nanoparticles; UV254+185 nm; Nitrogen oxides; Thermal decomposition process
Issue Date
2011-01
Publisher
Powder technology
Citation
VOL 206, NO 3, 306-311
Abstract
TiO2 nanopowder with a large surface area and high crystallinity was synthesized by a thermal decomposition process. The physicochemical properties of the prepared powders were examined by X-ray diffraction, transmission electron microscopy and nitrogen adsorption–desorption isotherms. The nanocrystallites of the prepared powerswere considerably smaller than those of the commercial photocatalyst (Degussa, P25), and the particles had a dense polyhedral structure. In addition, the particles had a mainly disordered mesoporous structure with a pore volume that varied according to the pore size in the range of 2–20 nm. The photocatalytic activity of the prepared photocatalystwas obviously higher than that of P25 on the photodegradation of gaseous nitrogen oxides under UV254+185 nm lampirradiation. Above 40% relative humidity, the NOx removal efficiency of the prepared photocatalystwas 10% higher than that of P25. Furthermore, a suitable relative humidity and longer residence time were found to enhance the photocatalytic oxidation of gaseous nitrogen oxides by UV254+185 nm lamp irradiation and TiO2 nanoparticles.
URI
http://pubs.kist.re.kr/handle/201004/39095
ISSN
0032-5910
Appears in Collections:
KIST Publication > Article
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