Abstract
Ag–AgBr/α-Ag3VO4 photocatalysts, prepared by an ionic liquid-assisted precipitation method, were used as an efficient visible light-driven photocatalytic system for removal of wastewater and pathogenic bacteria from the aqueous medium. X-ray diffraction powder, diffuse reflectance spectroscopy, Fourier transform infrared, scanning electron microscopy, and nitrogen adsorption–desorption isotherm (BET) analysis methods were used to characterize the nanostructures. Photodegradation mechanism was investigated and the results showed that the prepared samples were too efficient for the degradation of Acid Blue 92 (AB92) azo dye, and E. coli cells under visible light. The photogenerated electron–hole pairs reacted with the species in the solution and produced super active radicals such as $${\rm{O}}{{\rm{H}}^ \cdot }$$ , $${\rm{H}}{{\rm{O}}^ \cdot }_{\rm{2}}$$ , and $${{\rm{O}}^{ \cdot - }}_{\rm{2}}$$ which are responsible for the degradation of the environmental pollutions. TEM images were used to clarify the antibacterial activity of the products. Finally, as a practical application of the prepared photocatalysts, their ability evaluated for degradation of a real wastewater sample which was provided from the textile industries.
Highlights
Phtocatalytic treatment of water pollution using semiconductor-based materials has been considered as one of the most promising technologies to remove of toxic compounds from the environment
In spite of having suitable photoactivity, the high rate of electron–hole recombination makes the practical application of such materials limited
In this paper we report our new attempts to prepare the visible light Ag–AgBr/a-Ag3VO4 photocatalysts by a facile precipitation method at the presence of a watersoluble ionic liquid which acted as a complexing agent and bromide source
Summary
Phtocatalytic treatment of water pollution using semiconductor-based materials has been considered as one of the most promising technologies to remove of toxic compounds from the environment. In this paper we report our new attempts to prepare the visible light Ag–AgBr/a-Ag3VO4 photocatalysts by a facile precipitation method at the presence of a watersoluble ionic liquid which acted as a complexing agent and bromide source. Preparation of pure a-Ag3VO4 was carried out in the same manner without adding any [BMIM]Br. In all the experiments 0.02 g of photocatalysts was used and the used solvent was DDW.
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