Facile and cost-efficient synthesis of highly efficient CO 2 adsorbents: a pathway towards a green environment
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Facile and cost‑efficient synthesis of highly efficient CO2 adsorbents: a pathway towards a green environment Mohsen Zarei Mohammadabad1 · Mazaher Moeinaddini1 · Mohsen Nowrouzi2 · Reza Rafiee1 · Alireza Abbasi3
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The synthesis of highly efficient C O2 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 C O2 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 m 2/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. Keywords CO2 adsorption · Facile synthesis · HKUST-1@GrO · Thermodynamic study 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
* Mazaher Moeinaddini [email protected]; [email protected]
1 Introduction
1
In recent decades, with the expansion of population and urbanization, however, the growth of industries, human demand for energy has increased. This issue has led to a significant increase in the exploitation of fossil fuels as the main source of greenhouse gases (GHGS) emissions [1]. According to proven data, GHGS had been identified as the
Department of Environmental Science, Faculty of Natural Resources, University of Tehran, P.O. Box 4111, Karaj, Iran
2
Department of Marine Environment, Fa
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