Abstract
The synthesis of highly efficient CO2 adsorbent derived from MOF coupled with graphene oxide, HKUST-1@GrO, is proposed at the room temperature to achieve the most desirability form an eco-environmental perspective. The modified Hummers method coupled with an ultra-fast MOF formation approach were explored to synthesis the superior CO2 adsorbent, i.e. HKUST-1@GrO. Then, the structure of adsorbent was deeply characterized by the application of different analyses including Fourier-Transform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), Brunauer–Emmett–Teller (BET), and Scanning Electron Microscopy (SEM). The optimization of CO2 adsorption was carried out under a broad range of temperatures (283–293 K) and pressures (1–10 bars). The N2 adsorption/desorption isotherms analysis indicated that loading of graphene oxide (3 wt%) on HKUST-1 increases its specific surface area from 1032 to 1354 m2/g. The maximum adsorption capacity of CO2 by HKUST-1@GrO composite at 283 K and 10 bars was evaluated equal to 12.44 mmol/g. Thermodynamic studies elucidated that the dominant CO2 adsorption was taken place as spontaneous, physisorption, and exothermic.
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Abbreviations
- MOFs :
-
Material organic frameworks
- K:
-
Kelvin
- HDSs :
-
Hydroxy double salts
- P:
-
Pressure
- RGO:
-
Reduced graphene oxide
- Ps :
-
Equilibrium pressure of adsorption at standard pressure, bar
- GrO:
-
Graphene oxide
- q:
-
Amount of adsorbed, Mmol/g
- BTC:
-
1,3,5-Benzenetricarboxylic acid
- qm :
-
Maximum of CO2 adsorption capacity, mmol/g
- DMF:
-
N, N-dimethylformamide
- b:
-
Langmuir constant, 1/bar
- SEM:
-
Scanning electron microscopy
- KF :
-
Freundlich constant, [(mmol/g)(1/bar)(1/n)]
- BET:
-
Brunauer–Emmett–Teller
- n:
-
Freundlich exponent, dimensionless
- FTIR:
-
Fourier-Transform infrared spectroscopy
- ∆G:
-
Gibbs free energy, kJ/mol
- SRK:
-
Soave–Redlich–Kwong
- ∆Hads :
-
Isosteric heat of adsorption, kJ/mol
- SBET :
-
Surface-specific area, m2/g
- ∆S:
-
Entropy changes, J/K·mol
- Vtotal :
-
Total pore volume, cm3/g
- T:
-
Temperature, K or °C
- Vmeso :
-
Mesopore volume, cm3/g
- R:
-
Gas constant, 8.314 J/K·mol
- Vmicro :
-
Micropore volume, cm3/g
- R2 :
-
Determination coefficient
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Zarei Mohammadabad, M., Moeinaddini, M., Nowrouzi, M. et al. Facile and cost-efficient synthesis of highly efficient CO2 adsorbents: a pathway towards a green environment. J Porous Mater 27, 1659–1668 (2020). https://doi.org/10.1007/s10934-020-00945-6
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DOI: https://doi.org/10.1007/s10934-020-00945-6