Preparation and photocatalytic performance of a Pr–SiO2–TiO2 nanocomposite for degradation of aqueous dye wastewater
A novel Pr–SiO2–TiO2 nanocomposite catalyst was prepared by a sol–gel method and its photocatalytic degradation efficiency on Rhodamine B (RhB) was examined in aqueous dye wastewater. The structure and morphology of the catalyst samples were characterized using by low-temperature N2 adsorption, thermogravimetry-differential thermal analysis (TG/DTA), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Fourier-Transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The Pr–SiO2–TiO2 nanocomposite was found to exhibit a much higher photocatalytic activity under both UV and visible light irradiation as compared to a commercial TiO2 photocatalyst. The photodegradation efficiency of RhB (5 mg/L) were greater than 95% under UV light irradiation and 91% under visible light irradiation for 90 min, respectively. It is suggested that the synergetic effect between Pr–SiO2 and TiO2 not only inhibit the crystal growth and anatase-to-rutile transformation, but also extend the light response to the visible region. The prepared represents a noteworthy contribution to the study of pollutant degradation in dye wastewaters.
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Document Type: Research Article
Publication date: February 1, 2016
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