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Hormozgan University of Medical Sciences

Carbon quantum dots/layered double hydroxide hybrid for fast and efficient decontamination of Cd(II): The adsorption kinetics and isotherms

(2018) Carbon quantum dots/layered double hydroxide hybrid for fast and efficient decontamination of Cd(II): The adsorption kinetics and isotherms. Applied Surface Science.

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Abstract

Novel carbon quantum dots/zinc aluminum layered double hydroxide (CQD/ZnAl-LDH) composite was prepared through the precipitation of metal nitrates in the presence of CQD by a facile and simple method and further applied to remove excessive Cd(II) ions from water. The chemical composition and morphology of the CQDs/ZnAl-LDH hybrid was investigated by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and Energy-dispersive X-ray spectroscopy. Batch studies were done to evaluate the effects of the adsorption of Cd(II) by CQDs/ZnAl-LDH to optimize the major parameters such as pH, contact time, and initial concentration. The maximum uptake capacity of Cd(II) on CQDs/ZnAl-LDH was only 12.60 mg/g at 20 min due to the available exterior sites on the adsorbent. The adsorption kinetics and isotherms of Cd(II) on CQDs/ZnAl-LDH were also investigated. The experimental data indicated that the adsorption kinetics and adsorption isotherms of Cd(II) on CQDs/ZnAl-LDH were well-fitted by the pseudo-second-order kinetic model and the Freundlich isotherm model, respectively. © 2017 Elsevier B.V.

Item Type: Article
Additional Information: cited By 2
Keywords: Adsorption; Adsorption isotherms; Cadmium; Chemicals removal (water treatment); Energy dispersive spectroscopy; Fourier transform infrared spectroscopy; High resolution transmission electron microscopy; Isotherms; Kinetic parameters; Kinetic theory; Kinetics; Nanocrystals; Precipitation (chemical); Semiconductor quantum dots; Transmission electron microscopy; X ray diffraction; X ray spectroscopy, Adsorption kinetics and isotherm; Carbon quantum dots; Energy dispersive X ray spectroscopy; Freundlich isotherm model; Kinetic models; Layered double hydroxides; Pseudo-second-order kinetic models; Zn-Al layered double hydroxides, Cadmium compounds
Subjects: WA Public Health > WA 670-847 Environmental Pollution. Sanitation
Depositing User: هدی فهیم پور
URI: http://eprints.hums.ac.ir/id/eprint/5471

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