A facile in-situ hydrothermal synthesis of SrTiO3/TiO2 microsphere composite. (June 2016)

• Record Type: Journal Article
• Authors: Wang, Hongxing; Zhao, Wei; Zhang, Yubo; Zhang, Shimeng; Wang, Zihao; Zhao, Dan
• Is Part Of: Solid state communications. Volume 236(2016)
• Page Start: 27
• Page End: 31
• Publication Date: 2016-06
• Subjects: B. Mechanism -- C. Composite -- C. SrTiO3/TiO2 -- E. In-situ Hydrothermal; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.03.003
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: TiO2 was successfully used as sacrificed template to synthesise SrTiO3 /TiO2 microsphere composite via an in-situ hydrothermal process. The diameter of SrTiO3 /TiO2 microsphere was about 700 nm with the same size of the template, and all of the microspheres were in good dispersity. The optimized reaction parameters for the phase and morphology of the as-synthesized samples were investigated. The results showed the SrTiO3 /TiO2 microsphere can be synthesized at 170 °C when the concentration of sodium hydroxide was 0.1 M. Lower hydrothermal temperature hampered the formation of the SrTiO3 /TiO2 composite, the higher alkali concentration, however, will destroy the morphology of products. The formation mechanism of SrTiO3 /TiO2 microsphere composite was proposed and the photocatalytic properties of the samples were characterized using methylene blue solution as the pollutant under the UV light irradiation. The results indicated the proper OH − concentration will provide a channel for Sr 2+ to react with Ti 4+ located in the template and form the SrTiO3 /TiO2 composite, and those with micro-scaled spherical morphology exhibited good photocatalytic activities. Highlights: SrTiO3 /TiO2 microsphere composite was synthesized via in-situ hydrothermal process. The hydrothermal synthesis conditions were discussed. The formational mechanism of SrTiO3 /TiO2 microsphere composite was proposed. The photocatalytic properties of the samples were characterized.