Facile oxidative conversion of TiH2 to high-concentration Ti3+-self-doped rutile TiO2 with visible-light photoactivity

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

Research output: Contribution to journalArticlepeer-review

142 Scopus citations

Abstract

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 H 2O2 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.

Original languageEnglish (US)
Pages (from-to)3884-3890
Number of pages7
JournalInorganic chemistry
Volume52
Issue number7
DOIs
StatePublished - Apr 1 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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