Continuous one-step synthesis of N-doped titania under supercritical and subcritical water conditions for photocatalytic reaction under visible light

• Published in: The Journal of physics and chemistry of solids Vol. 71; no. 4; pp. 608 - 611
• Main Authors: Jeon, Ju-Won, Kim, Jeong-Rang, Ihm, Son-Ki
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2010
• Subjects: A. Oxides; A. Semiconductors; B. Chemical synthesis; C. Photoelectron spectroscopy; Crystallites; Degradation; Nitric acid; Photocatalysis; Reflectance; Titanium dioxide; Transmission electron microscopy; X-ray photoelectron spectroscopy; B. Chemical synthesis; A. Oxides; C. Photoelectron spectroscopy; A. Semiconductors
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2009.12.048

N-doped titania was prepared continuously by one-step synthetic method under supercritical and subcritical water conditions using titanium(IV)tetraisopropoxide (TTIP) and nitric acid as a titania precursor and nitrogen source, respectively. The synthesized N-doped titania particles were characterized by XRD, N 2-adsorption, TEM, XPS, UV–vis diffuse reflectance spectroscopy. N-doped titania was successfully synthesized and its crystalline structure was homogenous anatase phase with high surface area. The absorption edge of synthesized N-doped titania shifted into the visible light region compared with commercial titania P25. All synthesized N-doped titania have higher photocatalytic activity than P25 under visible light irradiation. The photocatalytic activity of N-doped titania synthesized under supercritical water condition was the highest for the degradation of methyl orange under visible light due to the larger crystallite size compared with the N-doped titania synthesized under subcritical water condition.