Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas
Biochar-based carbonaceous adsorbents are gaining interest due to their high availability, ease of modification, and low cost; however, they show limited adsorption of CO<sub>2</sub> in flue gas due to common textural properties. In this study, TEPA-modified biochar was used to prepare a...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/13/4/579 |
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| author | Wengang Tian Yanxia Wang Jian Hao Tuo Guo Xia Wang Xiaoju Xiang Qingjie Guo |
| author_facet | Wengang Tian Yanxia Wang Jian Hao Tuo Guo Xia Wang Xiaoju Xiang Qingjie Guo |
| author_sort | Wengang Tian |
| collection | DOAJ |
| description | Biochar-based carbonaceous adsorbents are gaining interest due to their high availability, ease of modification, and low cost; however, they show limited adsorption of CO<sub>2</sub> in flue gas due to common textural properties. In this study, TEPA-modified biochar was used to prepare a solid amine adsorbent for the efficient capture of CO<sub>2</sub> in flue gas. First, the porous biochar was prepared with FeCl<sub>3</sub>, Mg(NO<sub>3</sub>)<sub>2</sub>, and H<sub>2</sub>O (g) as activators and walnut shells as carbon sources. Next, the biochar was modified with TEPA to obtain a solid amine adsorbent. Porous texture properties and sample surface functional groups were characterized, and we measured the adsorption CO<sub>2</sub> of the amine-modified biochar in a breakthrough adsorption device. Results showed that biochar has a large specific surface area (744.38 m<sup>2</sup> g<sup>−1</sup>), a total pore volume of 1.41 cm<sup>3</sup> g<sup>−1</sup>, and a high mesoporous volume ratio (82.7%). The high pore volume provided a more efficient support space for loading tetraethylenepentamine (TEPA). The adsorbent had an excellent CO<sub>2</sub> adsorption capacity, corresponding to 2.82 mmol g<sup>−1</sup>, which increased to 3.31 mmol g<sup>−1</sup> and kept water resistance at 10% H<sub>2</sub>O (g) simulated flue gas (SFG). The FTIR analysis showed that H<sub>2</sub>O (g) inhibited urea production after cyclic adsorption. Therefore, solid amine adsorbent created by amine-modified biochar has potential advantages in its application for capturing CO<sub>2</sub> in SFG. |
| first_indexed | 2024-03-09T11:10:09Z |
| format | Article |
| id | doaj.art-84203d102704462b9726272608a07a67 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-09T11:10:09Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-84203d102704462b9726272608a07a672023-12-01T00:46:56ZengMDPI AGAtmosphere2073-44332022-04-0113457910.3390/atmos13040579Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue GasWengang Tian0Yanxia Wang1Jian Hao2Tuo Guo3Xia Wang4Xiaoju Xiang5Qingjie Guo6State Key Laboratory of High–Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaDepartment of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, ChinaState Key Laboratory of High–Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaDepartment of Chemistry, University College London, London WC1H 0AJ, UKDepartment of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, ChinaState Key Laboratory of High–Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High–Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaBiochar-based carbonaceous adsorbents are gaining interest due to their high availability, ease of modification, and low cost; however, they show limited adsorption of CO<sub>2</sub> in flue gas due to common textural properties. In this study, TEPA-modified biochar was used to prepare a solid amine adsorbent for the efficient capture of CO<sub>2</sub> in flue gas. First, the porous biochar was prepared with FeCl<sub>3</sub>, Mg(NO<sub>3</sub>)<sub>2</sub>, and H<sub>2</sub>O (g) as activators and walnut shells as carbon sources. Next, the biochar was modified with TEPA to obtain a solid amine adsorbent. Porous texture properties and sample surface functional groups were characterized, and we measured the adsorption CO<sub>2</sub> of the amine-modified biochar in a breakthrough adsorption device. Results showed that biochar has a large specific surface area (744.38 m<sup>2</sup> g<sup>−1</sup>), a total pore volume of 1.41 cm<sup>3</sup> g<sup>−1</sup>, and a high mesoporous volume ratio (82.7%). The high pore volume provided a more efficient support space for loading tetraethylenepentamine (TEPA). The adsorbent had an excellent CO<sub>2</sub> adsorption capacity, corresponding to 2.82 mmol g<sup>−1</sup>, which increased to 3.31 mmol g<sup>−1</sup> and kept water resistance at 10% H<sub>2</sub>O (g) simulated flue gas (SFG). The FTIR analysis showed that H<sub>2</sub>O (g) inhibited urea production after cyclic adsorption. Therefore, solid amine adsorbent created by amine-modified biochar has potential advantages in its application for capturing CO<sub>2</sub> in SFG.https://www.mdpi.com/2073-4433/13/4/579walnut shellbiocharcoactivationadsorbentCO<sub>2</sub> adsorption |
| spellingShingle | Wengang Tian Yanxia Wang Jian Hao Tuo Guo Xia Wang Xiaoju Xiang Qingjie Guo Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas Atmosphere walnut shell biochar coactivation adsorbent CO<sub>2</sub> adsorption |
| title | Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas |
| title_full | Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas |
| title_fullStr | Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas |
| title_full_unstemmed | Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas |
| title_short | Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas |
| title_sort | amine modified biochar for the efficient adsorption of carbon dioxide in flue gas |
| topic | walnut shell biochar coactivation adsorbent CO<sub>2</sub> adsorption |
| url | https://www.mdpi.com/2073-4433/13/4/579 |
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