Chin, Sungmin Park, Eunseuk Kim, Minsu Jeong, Juyoung Bae, Gwi-Nam Jurng, Jongsoo 2024-01-20T17:34:56Z 2024-01-20T17:34:56Z 2021-09-02 2011-01-30 0032-5910 https://pubs.kist.re.kr/handle/201004/130714 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 powers were 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 photocatalyst was obviously higher than that of P25 on the photodegradation of gaseous nitrogen oxides under UV254+185 nm lamp irradiation. Above 40% relative humidity, the NOx removal efficiency of the prepared photocatalyst was 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. (C) 2010 Elsevier B.V. All rights reserved. English ELSEVIER THERMAL-DECOMPOSITION NITRIC-OXIDE AIR NANOPARTICLES DEGRADATION TEMPERATURE OXIDATION REMOVAL IRRADIATION CATALYST Preparation of TiO2 ultrafine nanopowder with large surface area and its photocatalytic activity for gaseous nitrogen oxides Article 10.1016/j.powtec.2010.09.035 1 POWDER TECHNOLOGY, v.206, no.3, pp.306 - 311 POWDER TECHNOLOGY 206 3 306 311 scie scopus 000286299200014 2-s2.0-78649703944 Engineering, Chemical Engineering Article THERMAL-DECOMPOSITION NITRIC-OXIDE AIR NANOPARTICLES DEGRADATION TEMPERATURE OXIDATION REMOVAL IRRADIATION CATALYST Photocatalytic oxidation Nanoparticles UV254+185 (nm) Nitrogen oxides Thermal decomposition process