Jump to main content
Jump to site search

Issue 70, 2014
Previous Article Next Article

Generation of oxygen vacancies in visible light activated one-dimensional iodine TiO2 photocatalysts

Author affiliations

Abstract

A facile and efficient way of generating oxygen vacancies in visible light activated one-dimensional iodine doped TiO2 photocatalysts was first reported in this work. A two-step hydrothermal synthesis was used to synthesize TiO2 nanomaterials modified by iodic acid (HIO3) as a dopant. Detailed analysis was conducted to illustrate the intrinsic doping/reaction mechanisms of iodic acid in the modification of the TiO2 matrix. The phase and structure evolution were deduced from X-ray diffraction (XRD), Raman, and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) was conducted to analyze the generation of oxygen vacancies and the formation of I–O–Ti bonds in the TiO2 lattice. Multi-valences of iodine, due to the reduction of iodic acid, facilitated the generation of oxygen vacancies and 3d state Ti3+ species in the TiO2 lattice. The visible light absorption and enhanced photocatalytic activity of the TiO2 nanomaterials were attributed to existing oxygen vacancies, iodine multi-valences in I–O–Ti bonds, and 3d state Ti3+ sites in the TiO2 lattice. The photocatalytic degradation efficiency under visible light (λ > 400 nm) followed a pseudo first-order kinetic model. Rutile nanowires using a two-step synthesis method produced the highest methylene blue (10 mg L−1) degradation rate constant, Kap, of 7.92 × 10−3 min−1 compared to other synthesized nanomaterials. The Kap value obtained was an order of magnitude greater than commercial P25 (3.87 × 10−4 min−1) and pristine TiO2 nanowires (4.18 × 10−4 min−1). The iodine doped TiO2 photocatalysts can be used in TiO2/light irradiation advanced oxidation processes (AOPs) in water treatment using sunlight or a visible light source, rather than an ultraviolet irradiation source.

Graphical abstract: Generation of oxygen vacancies in visible light activated one-dimensional iodine TiO2 photocatalysts

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 May 2014, accepted on 06 Aug 2014 and first published on 06 Aug 2014


Article type: Paper
DOI: 10.1039/C4RA04768K
Author version
available:
Download author version (PDF)
RSC Adv., 2014,4, 36959-36966

  •   Request permissions

    Generation of oxygen vacancies in visible light activated one-dimensional iodine TiO2 photocatalysts

    W. Li, R. Liang, A. Hu, Z. Huang and Y. N. Zhou, RSC Adv., 2014, 4, 36959
    DOI: 10.1039/C4RA04768K

Search articles by author

Spotlight

Advertisements