Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium
Abstract
:1. Introduction
2. Experimental
2.1. Synthesis
2.2. Carbonization
2.3. Activation with CO2
2.4. Characterization
2.4.1. Physisorption of N2 at −196 °C and CO2 at 0 °C
2.4.2. Raman Spectroscopy
2.4.3. Scanning Electron Microscopy (SEM)
2.4.4. Infrared Spectroscopy
2.5. Kinetic Study of the CO2 Adsorption Process at 0 °C and Atmospheric Pressure
2.5.1. Pseudo First Order and Pseudo Second Order Models
2.5.2. Modified Pseudo First Order
2.5.3. Elovich Model
2.5.4. Intra-Particle Diffusion Model
2.6. Adsorption Studies
2.6.1. Langmuir Model
2.6.2. Freundlich Model
2.6.3. Sips Model
2.6.4. Toth Model
3. Results and Discussion
3.1. Physisorption
3.1.1. Physisorption of N2 to −196 °C
3.1.2. Physisorption of CO2 at 0 °C
3.2. Raman Spectroscopy
3.3. Scanning Electron Microscopy (SEM)
3.4. Infrared Spectroscopy
3.5. Adsorption of CO2 at 0 °C
3.5.1. Kinetic Study of the CO2 Adsorption Process at 0 °C
3.5.2. Study of the CO2 Adsorption Isotherms
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | SBET (m2 g−1) |
---|---|
ACB 1050 | 1927 |
AAB 850 | 1491 |
ACA 1050 | 893 |
AAA 850 | 629 |
Sample | Vn (cm3 g−1) |
---|---|
ACB 1050 | 0.698 |
AAB 850 | 0.357 |
ACA 1050 | 0.451 |
AAA 850 | 0.230 |
Kinetic Model | Parameter | Samples | |||
---|---|---|---|---|---|
ACB 1050 | AAB 850 | ACA 1050 | AAA 850 | ||
Pseudo first order | K1 | 0.0233 | 0.0212 | 0.0283 | 0.02395 |
R2 | 0.945 | 0.952 | 0.947 | 0.941 | |
Pseudo Second order | K2 | 0.0000866 | 0.0000903 | 0.0001.21 | 0.000230 |
R2 | 0.6521 | 0.6615 | 0.6734 | 0.689 | |
Modified Pseudo first order | Km | 0.0164 | 0.0154 | 0.0221 | 0.0181 |
R2 | 0.869 | 0.8872 | 0.895 | 0.8771 | |
Elovich | α | 0.0618 | 0.0368 | 0.0490 | 0.0239 |
β | 0.0838 | 0.102 | 0.0921 | 0.197 | |
R2 | 0.991 | 0.982 | 0.969 | 0.985 | |
Intra-particle diffusion | kdi1 | 2.04 | 1.82 | 2.37 | 0.888 |
R2 | 0.998 | 0.996 | 0.995 | 0.999 | |
kdi2 | 1.27 | 0.876 | 0.971 | 0.487 | |
R2 | 0.995 | 0.992 | 0.992 | 0.994 |
Models | Parameters | Sample | |||
---|---|---|---|---|---|
ACB 1050 | AAB 850 | ACA 1050 | AAA 850 | ||
Langmuir | qL | 12.01 | 7.70 | 7.29 | 4.04 |
KL | 38.48 | 52.07 | 107.84 | 72.17 | |
R2 | 0.99 | 0.99 | 0.99 | 0.99 | |
Freundlich | KF | 62.88 | 36.95 | 26.50 | 17.41 |
N | 1.56 | 1.73 | 2.32 | 1.95 | |
R2 | 0.99 | 0.99 | 0.99 | 0.99 | |
Sips | qS | 36.92 | 5.62 | 10.75 | 6.27 |
KS | 18.98 | 6.57 | 10.19 | 2.77 | |
ms | 0.99 | 0.58 | 0.66 | 0.51 | |
R2 | 0.99 | 0.99 | 1.00 | 0.99 | |
Toth | qT | 0.020 | 0.023 | 0.108 | 0.043 |
KT | 4.15 | 2.96 | 1.50 | 2.44 | |
mT | −0.19 | −0.18 | −0.16 | −0.19 | |
R2 | 0.99 | 0.99 | 0.99 | 0.99 |
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Guarín Romero, J.R.; Moreno-Piraján, J.C.; Giraldo Gutierrez, L. Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium. C 2018, 4, 52. https://doi.org/10.3390/c4040052
Guarín Romero JR, Moreno-Piraján JC, Giraldo Gutierrez L. Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium. C. 2018; 4(4):52. https://doi.org/10.3390/c4040052
Chicago/Turabian StyleGuarín Romero, Jhonatan R., Juan Carlos Moreno-Piraján, and Liliana Giraldo Gutierrez. 2018. "Kinetic and Equilibrium Study of the Adsorption of CO2 in Ultramicropores of Resorcinol-Formaldehyde Aerogels Obtained in Acidic and Basic Medium" C 4, no. 4: 52. https://doi.org/10.3390/c4040052