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In situ green oxidation synthesis of Ti³⁺ and N self-doped SrTiOₓNy nanoparticles with enhanced photocatalytic activity under visible light
- Liu, Jiandong, Ma, Xiaohong, Yang, Lina, Liu, Xingliang, Han, Aixia, Lv, Haitang, Zhang, Chao, Xu, Shiai
- RSC advances 2018 v.8 no.13 pp. 7142-7151
- X-ray diffraction, X-ray photoelectron spectroscopy, absorption, catalysts, crystal structure, hydrogen peroxide, irradiation, methylene blue, models, nanoparticles, oxidation, photocatalysis, reflectance spectroscopy, scanning electron microscopy, titanium, transmission electron microscopy, wastewater
- A simple in situ green oxidation synthesis route was developed to prepare Ti³⁺ and N self-doped SrTiOₓNy nanoparticles using TiN and H₂O₂ as precursors. X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) were used to characterize the crystallinity, structure and morphology. X-ray photoelectron spectroscopy (XPS) tests confirmed the presence of Ti³⁺ and N in the prepared SrTiOₓNy nanoparticles. The resultant nanoparticles were shown to have strong absorption from 400 to 800 nm using UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The formation mechanism of the Ti³⁺ and N self-doped SrTiOₓNy nanoparticles was also discussed. Under visible light irradiation, the obtained Ti³⁺ and N self-doped samples showed higher photocatalytic activity for the degradation of the model wastewater, methylene blue (MB) solution. The most active sample T-130-Vac, obtained at 130 °C under vacuum, showed a 9.5-fold enhancement in the visible light decomposition of MB in comparison to the commercial catalyst nano-SrTiO₃. The sample also showed a relatively high cycling stability for photocatalytic activity.