期刊
CERAMICS INTERNATIONAL
卷 40, 期 8, 页码 12273-12284出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.04.072
关键词
Sol-gel processes; X-ray methods; TiO2; Photocatalysts
资金
- Romanian National Authority for Scientific Research, CNDI-UEFISCDI [PN-II-PT-PCCA-2011-3.1-0031]
- Romanian Academy Program: Oxide systems obtained by the sol gel method [4.12]
Un-doped and Co-doped sol-gel TiO2 nanopowders have been prepared and structurally characterized. Three Co mass concentrations related to TiO2 content have been used: 0.5, 1 and 2 wt%. The morpho-structural changes due to the thermal treatment and dopant presence were followed by: thermal analysis methods, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and magnetic measurements. A detailed XRD analysis, based on an own calculus program, has established the lattice constants, the average size of the crystallites, < D >, and the average lattice strains, < S >, which can give some information about the structural disorder. The values of the lattice constants lead to the conclusion that a solid solution of the CoxTi1-xO2 form was obtained. The Co concentration imprints the paramagnetic behavior to the solid solutions. It influences the evolution of the < D > and < S > factors by the competition between: the deficit of oxygen acquired by un-doped TiO2 in the sol gel process (influenced by temperature), the dopant diffusion in the host lattice (influenced by ionic radius and valence) and the super-exchange interactions between the magnetic moments of the molecules of the solid solution (influenced by the concentration of Co). The sample with 1 wt% Co thermally treated at 400 degrees C ensures the best photocatalytic activity in the advanced degradation of nitrobenzene from water. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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