Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 58, Issue -, Pages 8-14Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2016.10.050
Keywords
X-ray photoelectron spectroscopy; 2,4-Dichlorophenoxyacetic acid; Doping (Ga, Ge, Zn); TiO2; Density Functional Theory; Quantum mechanics
Categories
Funding
- PRODEP [DSA/103.5/15/7495, IDCA 23898]
- TecMEX [5833.16-P]
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In the pursuit of environmental sustainability, nanomaterials with specific characteristics that can improve the environment by various methods have been developed. In this work, M-doped TiO2 microspheres have been synthesized by a colloidal route and doped with 1% in wt. of M (M=Zn, Ga and Ge). The materials were calcined at 400 degrees C and they were characterized by means X-ray diffraction (XRD) analysis, UV-vis spectroscopy coupled with diffuse reflectance spectroscopy (DRS), N-2 physisorption, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The catalytic activity of the materials was studied by evaluating the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid in an aqueous solution. Moreover the photocatalytic activity of the doped materials were enhanced compared to pristine material, according the next trend: Ge:TiO2 > Ga:TiO2 > Zn:TiO2 > TiO2. The presence of atoms of Zn, Ga or Ge in the structure of TiO2 was shown by XPS analysis, indeed these results reveal a diminution of the energy levels of the 2p(3/2) and 2p(1/2) electrons from doped materials compared with pristine material, which is evidence for a strong relationship between the doped cation valence of the TiO2 and the degradation of the 2,4-dichlorophenoxyacetic acid. Theoretical calculations within DFT framework were performed on two models of nanoparticles like-anatase in order to interpret the photocatalytic activity obtained experimentally by means the frontier orbitals (HOMO and LUMO), the morphology and electronic distribution.
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