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Performance and mechanism of illite in removing graphene oxide from aqueous solution
Abstract Clay minerals are widely considered adsorbents. Illite as one of the clay minerals has excellent adsorption properties. Graphene oxide (GO) is widely used and released into the environment, causing serious pollution to the natural ecological system, and posing a threat to organisms. In this article, the adsorption effect of GO using illite as adsorbents was investigated using a series of adsorption tests. Meantime, the adsorption mechanisms were characterized by Zeta potential, scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM) tests. Results showed: 1) Under the condition of ambient temperature T = 303 K, when pH was 3, illite mass was 150 mg, initial GO concentration was 80 mg/L, illite has the best adsorption effect on GO with an adsorption rate of 93.8%. 2) The adsorption effect of illite on GO increased with increasing temperature, and the Langmuir isotherm model could better reflect the adsorption behavior. 3) The adsorption kinetics experiment reached the adsorption equilibrium at 2160 min, and the kinetic fitting model was more in line with the pseudo-second-order kinetic model. Illite adsorption was a spontaneous endothermic reaction. According to the analysis of the test results, illite removal of GO is an efficient and environmentally friendly method.
Graphical Abstract Display Omitted
Highlights Adsorption of graphene oxide in aqueous solution by illite, a natural clay mineral. Adsorption kinetics and thermodynamics were used to study the adsorption properties of illite for graphene oxide removal. The removal rate of graphene oxide in aqueous solution by illite was as high as 93.8%
Performance and mechanism of illite in removing graphene oxide from aqueous solution
Abstract Clay minerals are widely considered adsorbents. Illite as one of the clay minerals has excellent adsorption properties. Graphene oxide (GO) is widely used and released into the environment, causing serious pollution to the natural ecological system, and posing a threat to organisms. In this article, the adsorption effect of GO using illite as adsorbents was investigated using a series of adsorption tests. Meantime, the adsorption mechanisms were characterized by Zeta potential, scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM) tests. Results showed: 1) Under the condition of ambient temperature T = 303 K, when pH was 3, illite mass was 150 mg, initial GO concentration was 80 mg/L, illite has the best adsorption effect on GO with an adsorption rate of 93.8%. 2) The adsorption effect of illite on GO increased with increasing temperature, and the Langmuir isotherm model could better reflect the adsorption behavior. 3) The adsorption kinetics experiment reached the adsorption equilibrium at 2160 min, and the kinetic fitting model was more in line with the pseudo-second-order kinetic model. Illite adsorption was a spontaneous endothermic reaction. According to the analysis of the test results, illite removal of GO is an efficient and environmentally friendly method.
Graphical Abstract Display Omitted
Highlights Adsorption of graphene oxide in aqueous solution by illite, a natural clay mineral. Adsorption kinetics and thermodynamics were used to study the adsorption properties of illite for graphene oxide removal. The removal rate of graphene oxide in aqueous solution by illite was as high as 93.8%
Performance and mechanism of illite in removing graphene oxide from aqueous solution
Li, Na (author) / Yu, Shimeng (author) / Fang, Jiyuan (author) / Yu, Yanfei (author) / Jiang, Ping (author) / Pu, Shaoyun (author) / Wang, Wei (author)
Applied Clay Science ; 230
2022-09-16
Article (Journal)
Electronic Resource
English
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