4.7 Article

Performance and mechanisms of fly ash for graphene oxide removal from aqueous solution

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 3, Pages 3773-3783

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-15769-3

Keywords

Graphene oxide; Fly ash; Adsorption; Mechanism; Isotherms; Thermodynamic

Funding

  1. National Natural Science Foundation of China [41772311]
  2. Zhejiang Provincial Natural Science Foundation of China [LQ20E080005]
  3. Open Research Fund of Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering of Hohai University [2019020]
  4. Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science [Z017013]

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This study evaluated the removal of graphene oxide from water using fly ash, and found that under optimal conditions, fly ash can effectively remove graphene oxide, reducing its negative impact on organisms and ecosystems. The experimental results demonstrated that fly ash is a good material for removing graphene oxide from aqueous solution.
The potential wide use of graphene oxide in various fields results in the possibility of its dispersion throughout natural water systems, with a negative impact on organisms and ecosystems. This study evaluated the removal of graphene oxide (GO) from water by fly ash (FA). The effects of various conditions (including the initial concentration of graphene oxide, the pH of the initial solution, the amount of absorbent, and temperature) on the removal rate of GO were investigated in detail. The results show that the maximum removal rate of graphene oxide by fly ash is 93%; the isotherm adsorption process conforms to a Langmuir model; the adsorption reaction is a spontaneous exothermic process. Under optimal conditions, the pH of the solution was adjusted to 6, the amount of fly ash was 5 mg, the initial concentration of GO was 60 mg center dot L-1, and the temperature was 303 K. Using X-ray diffraction (XRD), Raman spectroscopy (Raman), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscopy (TEM), Zeta potential and X-ray electron spectroscopy (XPS), the adsorption mechanism was characterized. The experimental results demonstrate that fly ash is a good material for GO removal from aqueous solution.

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