Influence of nitrogen content levels on structural properties and photocatalytic activities of nanorice-like N-doped TiO2 with various calcination temperatures. (September 2018)

• Record Type: Journal Article
• Authors: Suwannaruang, Totsaporn; Kamonsuangkasem, Krongthong; Kidkhunthod, Pinit; Chirawatkul, Prae; Saiyasombat, Chatree; Chanlek, Narong; Wantala, Kitirote
• Is Part Of: Materials research bulletin. Volume 105(2018)
• Page Start: 265
• Page End: 276
• Publication Date: 2018-09
• Subjects: Interstitial atom -- Restraining phase transformation -- Chemical state -- Photocatalysis -- Paraquat degradation; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.05.010
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Hydrothermal method enhances the integration of N species into TiO2 . TiO2 doping with nitrogen prevents the phase transformation from anatase to rutile. The N-doped TiO2 exhibits nanorice-like morphology. Nitrogen atom incorporates into the lattice of TiO2 with interstitial site (TiON). Nitrogen doping content in TiO2 accelerates the kinetic rate of photocatalytic reaction. Abstract: The purposes of this research were to study the effect of nitrogen content levels on structural properties and photocatalytic activities of catalysts with various calcination temperatures and to test the photocatalytic degradation of paraquat under UV and visible light. The results showed that the effect of calcination temperature was significant on physical properties and amount of nitrogen element, but insignificant on phase structure and oxidation state of titanium (Ti) atom. The N-doped TiO2 samples demonstrated only anatase phase because nitrogen dopant in TiO2 restrained the phase transformation from anatase to rutile and displayed nanorice-like morphology. The bandgap energy was about 3.07–3.18 eV. The nitrogen content was only observed at 100, 300 and 400 °C. The nitrogen (N) atom can be incorporated in TiO2 structural lattice with interstitial site. The specific surface area and nitrogen content level showed the important roles for the photodegradation of paraquat under UV and visible light irradiation.