Abstract
This study demonstrated the hydrothermal synthesis of bimetallic nickel-cobalt tungstate nanostructures, Ni-CoWO4 (NCW-NPs), and their phase structure, morphology, porosity, and optical properties were examined using X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDS), high resolution Transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) and Raman instruments. It was found that as-calcined NCW-NPs have a monoclinic phase with crystal size ~50–60 nm and is mesoporous. It possessed smooth, spherical, and cubic shape microstructures with defined fringe distance (~0.342 nm). The photocatalytic degradation of methylene blue (MB) and rose bengal (RB) dye in the presence of NCW-NPs was evaluated, and about 49.85% of MB in 150 min and 92.28% of RB in 90 min degraded under visible light. In addition, based on the scavenger’s study, the mechanism for photocatalytic reactions is proposed.
Highlights
Among the various catalytic reaction, photocatalysis has drawn much attention because photo-irradiation of the catalyst increases the reaction process, and reduces the initiation path and activation energy without its involvement as reactants and products [1]
Cationic (MB) and anionic (RB) dyes were used to evaluate the photocatalytic reactivity of the as-calcined Ni-CoWO4 nanoparticles (NCW-NPs) in response to visible light
To evaluate the photocatalytic activities of the Ni-CoWO4 nanoparticles, the photocatalytic decomposition of methylene blue (MB) and rose bengal (RB) under a 300 W Xe lamp with a 420 nm cutoff filter irradiation was selected as a model dye
Summary
Among the various catalytic reaction, photocatalysis (activation of catalyst by light absorption of suitable wavelength/bandgap energy) has drawn much attention because photo-irradiation of the catalyst increases the reaction process, and reduces the initiation path and activation energy without its involvement as reactants and products [1]. The best-fitting parameters for the dye degradation are that the photocatalyst must have a low recombination rate of charge carriers (electron-hole pairs), extended wavelength/narrow bandgaps, high rate of electron transfer, and large facility for the photocatalytic reaction/chemisorption on its surface These features can be achieved using various strategies such as morphology alteration, doping, compositing, and the coupling of inorganic and organic precursors (e.g., carbon nitrides, reduced graphene, noble metals, and nonmetals) in semiconductors to achieve a state of capturing the visible-light region of solar spectrum [1,2,3,4,5,6,7,8,9,10,11]. Photocatalytic activity against rose bengal and methylene blue dyes are looked at in detail
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