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Facile Oxidative Conversion of TiH 2 to High-Concentration Ti 3+ -Self-Doped Rutile TiO 2 with Visible-Light Photoactivity

2013; American Chemical Society; Volume: 52; Issue: 7 Linguagem: Inglês

10.1021/ic3026182

1520-510X

Lauren R. Grabstanowicz, Shanmin Gao, Tao Li, Robert M. Rickard, Tijana Rajh, Di‐Jia Liu, Tao Xu,

Advanced Nanomaterials in Catalysis

TiO2, in the rutile phase with a high concentration of self-doped Ti3+, has been synthesized via a facile, all inorganic-based, and scalable method of oxidizing TiH2 in H2O2 followed by calcinations in Ar gas. The material was shown to be photoactive in the visible-region of the electromagnetic spectrum. Powdered X-ray diffraction (PXRD), transmission electron microscopy (TEM), ultraviolet–visible-near-infrared (UV–vis-NIR), diffuse reflectance spectroscopy (DRS), and Brunauer–Emmett–Teller (BET) methods were used to characterize the crystalline, structural, and optical properties and specific surface area of the as-synthesized Ti3+-doped rutile, respectively. The concentration of Ti3+ was quantitatively studied by electron paramagnetic resonance (EPR) to be as high as one Ti3+ per ∼4300 Ti4+. Furthermore, methylene blue (MB) solution and an industry wastewater sample were used to examine the photocatalytic activity of the Ti3+-doped TiO2 which was analyzed by UV–vis absorption, Fourier transform infrared spectroscopy (FT-IR), and electrospray ionization mass spectrometry (ESI-MS). In comparison to pristine anatase TiO2, our Ti3+ self-doped rutile sample exhibited remarkably enhanced visible-light photocatalytic degradation on organic pollutants in water.