title: Efficient adsorption and photocatalytic degradation of Congo red onto hydrothermally synthesized NiS nanoparticles.
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.
authors.affiliation: Department of Chemistry & Environmental Science, Zhangzhou Normal University, Zhangzhou, 363000 People's Republic of China.
authors.forename: Hongxu
authors.initials: H
authors.lastname: Guo
authors.forename: Yingchang
authors.initials: Y
authors.lastname: Ke
authors.forename: Dongfeng
authors.initials: D
authors.lastname: Wang
authors.forename: Kaili
authors.initials: K
authors.lastname: Lin
authors.forename: Ruxiang
authors.initials: R
authors.lastname: Shen
authors.forename: Jianhua
authors.initials: J
authors.lastname: Chen
authors.forename: Wen
authors.initials: W
authors.lastname: Weng
keywords: Adsorption; Congo red; Mechanism; NiS nanoparticles; Photocatalytic degradation