Abstract
NiS nanoparticles (NiS NPs) have been hydrothermally prepared and characterized by the methods of X-ray diffraction, scanning electronic microscope, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectra, photoluminescence, and thermogravimetric analysis. NiS NPs exhibit fast adsorption in the removal of Congo red (CR) in aqueous solution, in which the pseudo-second-order model was the best to describe the adsorption kinetics, and the intraparticle diffusion was not only the rate-limiting step. The NiS NPs also exhibit efficient photocatalytic activity in the degradation of CR under visible-light irradiation, in which the 30 mg/L CR was almost completely degraded after illumination during 210 min. The •OH radicals in the process of photocatalytic degradation were observed by fluorescence technique.
Highlights
Colored dyes have been extensively applied in the textile, paper, cosmetics, pharmaceuticals, and food industries
The NiS nanoparticles (NiS NPs) exhibit efficient photocatalytic activity in the degradation of Congo red (CR) under visible-light irradiation, in which the 30 mg/ L CR was almost completely degraded after illumination during 210 min
For the adsorption kinetics experiments, 0.10 g of NiS NPs powder was added to 200 mL of CR aqueous solution at the initial concentrations of 40, 60, and 80 mg/L
Summary
Colored dyes have been extensively applied in the textile, paper, cosmetics, pharmaceuticals, and food industries. NiS NPs exhibit fast adsorption in the removal of Congo red (CR) in aqueous solution, in which the pseudo-secondorder model was the best to describe the adsorption kinetics, and the intraparticle diffusion was the rate-limiting step. For the adsorption kinetics experiments, 0.10 g of NiS NPs powder was added to 200 mL of CR aqueous solution at the initial concentrations of 40, 60, and 80 mg/L.
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