Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 15, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-013-1475-y
Keywords
NiS nanoparticles; Adsorption; Photocatalytic degradation; Congo red; Mechanism
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Funding
- Natural Science Foundation of Zhangzhou [ZZ2012J01]
- National Natural Science Foundation of China [20977074, 21175115]
- Nature Science Foundation of Fujian [2012J06005]
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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 center dot OH radicals in the process of photocatalytic degradation were observed by fluorescence technique.
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