Kinetic and mechanistic study of CO2 adsorption on activated hydrochars
Four activated hydrochars (AHCs) were obtained by hydrothermal carbonization of pine sawdust followed by physical and chemical activation in mild conditions. The effects of the activating agents on the porous structure of AHCs were analysed using nitrogen adsorption isotherms. Their CO2 adsorption c...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Journal of CO2 Utilization |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982024000519 |
| _version_ | 1797235509410398208 |
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| author | M.F. Vega E. Díaz-Faes C. Barriocanal |
| author_facet | M.F. Vega E. Díaz-Faes C. Barriocanal |
| author_sort | M.F. Vega |
| collection | DOAJ |
| description | Four activated hydrochars (AHCs) were obtained by hydrothermal carbonization of pine sawdust followed by physical and chemical activation in mild conditions. The effects of the activating agents on the porous structure of AHCs were analysed using nitrogen adsorption isotherms. Their CO2 adsorption capacity was assessed by means of carbon dioxide isotherms at 25 and 50 ºC and thermogravimetry, and compared with a commercial activated carbon (AC). SBET values greater than 2000 m2/g were obtained. A narrow micropore volume of 0.392 cm3/g was obtained for the hydrochar activated with KHCO3. The highest CO2 uptake of 3.3 mmol/g (145.2 mg/g) was obtained at room temperature (25 ºC) for the hydrochar activated with KHCO3. Three kinetic models (pseudo-first, pseudo-second and fractional order Avrami’s models) were used to examine the rate parameters of CO2 uptake, with Avrami’s model giving the most accurate prediction of CO2 adsorption. The intraparticle diffusion model and Boyd’s film-diffusion model were applied to identify the CO2 adsorption mechanism. |
| first_indexed | 2024-03-07T22:53:55Z |
| format | Article |
| id | doaj.art-00fda43ffa92437e8eb41ccb47484726 |
| institution | Directory Open Access Journal |
| issn | 2212-9839 |
| language | English |
| last_indexed | 2024-04-24T16:49:05Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj.art-00fda43ffa92437e8eb41ccb474847262024-03-29T05:50:06ZengElsevierJournal of CO2 Utilization2212-98392024-03-0181102716Kinetic and mechanistic study of CO2 adsorption on activated hydrocharsM.F. Vega0E. Díaz-Faes1C. Barriocanal2Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26, Oviedo, Asturias 33011, SpainInstituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26, Oviedo, Asturias 33011, SpainCorresponding author.; Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26, Oviedo, Asturias 33011, SpainFour activated hydrochars (AHCs) were obtained by hydrothermal carbonization of pine sawdust followed by physical and chemical activation in mild conditions. The effects of the activating agents on the porous structure of AHCs were analysed using nitrogen adsorption isotherms. Their CO2 adsorption capacity was assessed by means of carbon dioxide isotherms at 25 and 50 ºC and thermogravimetry, and compared with a commercial activated carbon (AC). SBET values greater than 2000 m2/g were obtained. A narrow micropore volume of 0.392 cm3/g was obtained for the hydrochar activated with KHCO3. The highest CO2 uptake of 3.3 mmol/g (145.2 mg/g) was obtained at room temperature (25 ºC) for the hydrochar activated with KHCO3. Three kinetic models (pseudo-first, pseudo-second and fractional order Avrami’s models) were used to examine the rate parameters of CO2 uptake, with Avrami’s model giving the most accurate prediction of CO2 adsorption. The intraparticle diffusion model and Boyd’s film-diffusion model were applied to identify the CO2 adsorption mechanism.http://www.sciencedirect.com/science/article/pii/S2212982024000519Pine sawdustHydrocharKHCO3 activationCO2 adsorptionAdsorption kinetic |
| spellingShingle | M.F. Vega E. Díaz-Faes C. Barriocanal Kinetic and mechanistic study of CO2 adsorption on activated hydrochars Journal of CO2 Utilization Pine sawdust Hydrochar KHCO3 activation CO2 adsorption Adsorption kinetic |
| title | Kinetic and mechanistic study of CO2 adsorption on activated hydrochars |
| title_full | Kinetic and mechanistic study of CO2 adsorption on activated hydrochars |
| title_fullStr | Kinetic and mechanistic study of CO2 adsorption on activated hydrochars |
| title_full_unstemmed | Kinetic and mechanistic study of CO2 adsorption on activated hydrochars |
| title_short | Kinetic and mechanistic study of CO2 adsorption on activated hydrochars |
| title_sort | kinetic and mechanistic study of co2 adsorption on activated hydrochars |
| topic | Pine sawdust Hydrochar KHCO3 activation CO2 adsorption Adsorption kinetic |
| url | http://www.sciencedirect.com/science/article/pii/S2212982024000519 |
| work_keys_str_mv | AT mfvega kineticandmechanisticstudyofco2adsorptiononactivatedhydrochars AT ediazfaes kineticandmechanisticstudyofco2adsorptiononactivatedhydrochars AT cbarriocanal kineticandmechanisticstudyofco2adsorptiononactivatedhydrochars |