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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.