Abstract
To improve the photocatalytic property of titanium dioxide, titanous sulfate as the titanium source, cobalt nitrate hexahydrate as the cobalt source, undoped and Co2+-doped titania nanotubes were prepared via coprecipitation method combined with hydrothermal synthesis. Based on the degradation rate of methylene blue, the effects of the codoped rate on photocatalytic activities of the sample were researched. The result showed that doping cobalt could improve the photocatalytic performance of the titanium dioxide nanotubes under the ultraviolet light. The composition and structure of the samples were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, and selected area electron diffraction. Conclusions indicated that the low-concentration Co2+ has no influence on the crystal structure of titanium dioxide and no new crystals were formed in the whole process.
Highlights
In modern society, environmental pollution and the energy crisis have been more and more serious
To improve its photocatalytic performance under the UV light and the visible irradiation, metal-doped titanium dioxide has been widely studied over the past decades.[1]
Lee et al.[11] reported that compounding cobalt oxide nanoparticles on the surface of titanium dioxide powders via liquid phase plasma method can improve the photocatalytic performance of titanium dioxide under visible light but reduce the photocatalytic performance of titanium dioxide under the UV light
Summary
Environmental pollution and the energy crisis have been more and more serious. Nanomaterials and Nanotechnology than that of undoped titanium dioxide under the UV irradiation, and Co-doped titanium dioxied (0.5%) had the highest photocatalytic performance under visible light irradiation (samples prepared by sol–gel method). According to the aforementioned articles, the photocatalytic performance of titanium dioxide-doped Co usually increased in the visible light and reduced under the UV light. In this study, undoped and Co-doped titanium dioxide nanotubes were prepared via coprecipitation method combined with hydrothermal synthesis and researched the photocatalytic properties of Co-doped titanium dioxide nanotubes under the UV irradiation. In order to further research on the mechanism of the titanium dioxide nanostructures formation in NaOH solution[23] and establish the crystal structure of the nanotubes,[24] a large number of researchers have done lots of research, since the method was introduced in 1998.25 The hydrothermal temperature of nanostructures formation was 130C. When the temperature increased up to 700C, anatase begins to transform to rutile, anatase transform to rutile completely, at 900C
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