Abstract
TiO2 doped with C, N and S (TCNS photocatalyst) was prepared by hydrolysis process using titanium iso-propoxide and thiourea. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photo electron spectroscopy (XPS), BET surface area, FTIR and diffuse reflectance spectra (DRS). The results showed that the prepared catalysts are anatase type and nanosized par-ticles. The catalysts exhibited stronger absorption in the visible light region with a red shift in the adsorption edge. The photocatalytic activity of TCNS photocatalysts was evaluated by the photocatalytic degradation of isoproturon pesticide in aqueous solution. In the present study the maximum activity was achieved for TCNS5 catalyst at neutral pH with 1 g L-1 catalyst amount and at 1.14 x 10-4 M concentration of the pesticide solution. The TCNS photocatalysts showed higher phtocatalytic activity under solar light irradiation. This is attributed to the synergetic effects of red shift in the absorption edge, higher surface area and the inhibition of charge carrier recombination process.
Highlights
Organic compounds are widely used in industry and in daily life, have become common pollutants in water bodies
The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photo electron spectroscopy (XPS), BET surface area, Fourier transform-infra red spectra (FTIR) and diffuse reflectance spectra (DRS)
It can be inferred that the ratio of thiourea to titania slightly influence the crystallization of the mesoporous titania
Summary
Organic compounds are widely used in industry and in daily life, have become common pollutants in water bodies. As they are known to be noxious and carcinogenic, an effective and economic treatment for eliminating the organic pollutants in water has been found to be an urgent demand. The treatment of water contaminated with recalcitrant compounds is an important task to attend every country in the world. Have been carried out to mineralize many synthetic organic chemicals. Alternative technologies are in demand for development to treat recalcitrant compounds in wastewater effluents. Photocatalytic process has been found to be very active in the treatment of wastewaters for the mineralization of broad range of organic pollutants. Heterogeneous mediated photocatalysis treatment technique gained noteworthy importance for the treatment of wastewaters
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