Abstract
Zr-doped TiO2 nano photocatalyst obtained with a various trace amount of Zr, by using the sol-gel method. Several spectroscopic techniques applied to characterize the structures and properties of nano-photocatalyst. It founded that the effect of doping Zr ions to the TiO2 lattice led it to improve the surface properties and decreasing the particle size of nano-photocatalyst. Therefore, it causes increasing specific surface area and photocatalytic activity as compared with pure TiO2. The results revealed that there was an inverse relationship between the growth of the crystallite size of the nano photocatalyst and the decline of the molar ratios of Zr. The photocatalytic activity of the nano photocatalyst employed for the decolorization of Congo red as an Azo dye in the aqueous solution under UV irradiation in a batch reactor. The results exhibited that the TiO2/Zr0.0004 brings the best photocatalytic activity.
Highlights
One of the most important sources of environmental contamination is dye pollution
The Zr-doped TiO2 nano photocatalyst was organized with a trace amount of Zr applying the Sol-Gel process
The TZ4 catalyst was obtained the best results in photodegradation and 0.004 mol ratio of Zr is the best value of dopant
Summary
One of the most important sources of environmental contamination is dye pollution. Heterogeneous photocatalysis is an interesting method employed for the thorough removal of pollution under solar or artificial light irradiation [1,2]. The nanocomposites were prepared using the sol-gel method and the TiO2/Zr nano photocatalyst is characterized by several spectroscopic techniques Such as Fourier Transform infra-red spectroscopy (FT-IR), X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM),. To get To Zr doped-TiO2, Zr sol was developed in the following way: First, zirconium tetrachloride was allowed to be dissolved in absolute ethanol (alcoholic solution of ZrCl4), with the molar ratios of Zr to ethanol being (0.0002:1.52, and 0.0004:1.52). It stirred for 5 min and respectively added to the mixture of absolute ethanol, Nitric acid and 0.1 g CTAB (Sol 2). 0.01 g of the catalyst was added to a 25ml aqueous solution of Congo red, which had an initial concentration of 5 ppm
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