Abstract
High quality silver (Ag) decorated CeO2 nanoparticles were prepared by a facile one-step chemical method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), High resolution transmission electron microscopy (HR-TEM), fourier transform infrared spectrometer (FT-IR), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), UV–Visible absorption (UV–Vis), photoluminescence (PL) and thermogravimetric analysis. The decoration of Ag on CeO2 surface was confirmed by XRD, EPR and HR-TEM analysis. Harmful textile pollutant Rose Bengal dye was degraded under sunlight using the novel Ag decorated CeO2 catalyst. It was found that great enhancement of the degradation efficiency for Ag/CeO2 compared to pure CeO2, it can be ascribed mainly due to decrease in its band gap and charge carrier recombination rate. The Ag/CeO2 sample exhibited an efficient photocatalytic characteristic for degrading RB under visible light irradiation with a high degradation rate of 96% after 3 h. With the help of various characterizations, a possible degradation mechanism has been proposed which shows the effect of generation of oxygen vacancies owing to the decoration of Ag on the CeO2 surface.
Highlights
High quality silver (Ag) decorated CeO2 nanoparticles were prepared by a facile one-step chemical method
Various transition metal oxides such as TiO2, NiO, CuO, ZnO and BiVO4 have been have been widely examined as photocatalysts for photocatalytic hydrogen production and color removal from the textile wastewater[5,6,7,8,9,10]
As one of the most significant earth oxides, ceria (CeO2) has fascinated in more consideration for its promising application in photocatalytic dye degradation, solid oxide fuel cells, electrochemical sensor, ultraviolet filter, supercapacitor, solar cells and optical m aterials11,12. CeO2 is a n-type semiconductor metal oxide, it has a few properties like TiO2, for example, chemical inactivity, cheap, photo stability and non-toxicity[13,14,15,16,17]
Summary
High quality silver (Ag) decorated CeO2 nanoparticles were prepared by a facile one-step chemical method. Metal oxide nanoparticles have been considered in more consideration due its attractive applications including energy conversion, storage, solar fuel, photocatalytic and medical. These metal oxides have been successfully used for wastewater management and water splitting. Incorporation or decoration of metal ions like silver (Ag) is an attractive method which enhanced the optical and catalytic properties of metal oxides. Such enhancement of photocatalytic behavior was obtained because of several factors such as tuning size, improved surface to volume ratio, morphology, band gap and various types of defects[23]. Photocatalytic behaviour of the pure C eO2 and Ag decorated C eO2 nanoparticles were evaluated by photodegradation of RB dye under visible-light irradiation
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