Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation
Activated carbons (ACs) were prepared by physical (CO2) and chemical (K2CO3) activation of wood (Japanese cypress). Porous properties of the ACs, such as BET surface area and micropore volumes Vmic(N2) and Vmic(CO2), were characterized by N2 and CO2 adsorption isotherms. Short activation times cause...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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2017
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| Online Access: | https://hdl.handle.net/10356/83335 http://hdl.handle.net/10220/42518 |
| _version_ | 1826130536570028032 |
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| author | Veksha, Andrei Uddin, Md. Azhar Sasaoka, Eiji Kato, Yoshiei |
| author2 | Nanyang Environment and Water Research Institute |
| author_facet | Nanyang Environment and Water Research Institute Veksha, Andrei Uddin, Md. Azhar Sasaoka, Eiji Kato, Yoshiei |
| author_sort | Veksha, Andrei |
| collection | NTU |
| description | Activated carbons (ACs) were prepared by physical (CO2) and chemical (K2CO3) activation of wood (Japanese cypress). Porous properties of the ACs, such as BET surface area and micropore volumes Vmic(N2) and Vmic(CO2), were characterized by N2 and CO2 adsorption isotherms. Short activation times caused formation of micropores with sizes smaller than 0.7 nm, which had a restricted access for N2 molecules. As a result, the ACs prepared through short activation time exhibited Vmic(N2) smaller than Vmic(CO2). The ACs were used for benzene adsorption at 5 ppmv concentration and relative humidities (RHs) of 0, 50 and 70 %. The largest benzene adsorption capacities at these RHs were exhibited by the AC prepared with K2CO3 activation at 800 °C. At RH 0 %, the benzene adsorption on the ACs was governed by Vmic(N2), when it was smaller than Vmic(CO2), and by Vmic(CO2), when it was smaller than Vmic(N2). The lower determination coefficients for the relationship between benzene uptake by the ACs and the volume of micropores at RHs 50 and 70 % compared to RH 0 % were attributed to the increased influence of surface chemistry of the ACs in the presence of moisture. In particular, the benzene adsorption at RHs 50 and 70 % was detrimentally affected by larger amounts of ash and surface oxygen groups. |
| first_indexed | 2024-10-01T07:57:41Z |
| format | Journal Article |
| id | ntu-10356/83335 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:57:41Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/833352020-09-26T22:02:39Z Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation Veksha, Andrei Uddin, Md. Azhar Sasaoka, Eiji Kato, Yoshiei Nanyang Environment and Water Research Institute Activated carbon Benzene adsorption Activated carbons (ACs) were prepared by physical (CO2) and chemical (K2CO3) activation of wood (Japanese cypress). Porous properties of the ACs, such as BET surface area and micropore volumes Vmic(N2) and Vmic(CO2), were characterized by N2 and CO2 adsorption isotherms. Short activation times caused formation of micropores with sizes smaller than 0.7 nm, which had a restricted access for N2 molecules. As a result, the ACs prepared through short activation time exhibited Vmic(N2) smaller than Vmic(CO2). The ACs were used for benzene adsorption at 5 ppmv concentration and relative humidities (RHs) of 0, 50 and 70 %. The largest benzene adsorption capacities at these RHs were exhibited by the AC prepared with K2CO3 activation at 800 °C. At RH 0 %, the benzene adsorption on the ACs was governed by Vmic(N2), when it was smaller than Vmic(CO2), and by Vmic(CO2), when it was smaller than Vmic(N2). The lower determination coefficients for the relationship between benzene uptake by the ACs and the volume of micropores at RHs 50 and 70 % compared to RH 0 % were attributed to the increased influence of surface chemistry of the ACs in the presence of moisture. In particular, the benzene adsorption at RHs 50 and 70 % was detrimentally affected by larger amounts of ash and surface oxygen groups. Published version 2017-05-30T06:22:39Z 2019-12-06T15:20:12Z 2017-05-30T06:22:39Z 2019-12-06T15:20:12Z 2012 Journal Article Veksha, A., Uddin, M. A., Sasaoka, E., & Kato, Y. (2012). Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation. International Journal of Chemical Engineering and Applications, 3(1), 1-5. 2010-0221 https://hdl.handle.net/10356/83335 http://hdl.handle.net/10220/42518 10.7763/IJCEA.2012.V3.149 en International Journal of Chemical Engineering and Applications © 2012 International Journal of Chemical Engineering and Applications (IJCEA). This paper was published in International Journal of Chemical Engineering and Applications and is made available as an electronic reprint (preprint) with permission of International Journal of Chemical Engineering and Applications (IJCEA). The published version is available at: [http://doi.org/10.7763/IJCEA.2012.V3.149]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 5 p. application/pdf |
| spellingShingle | Activated carbon Benzene adsorption Veksha, Andrei Uddin, Md. Azhar Sasaoka, Eiji Kato, Yoshiei Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title | Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title_full | Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title_fullStr | Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title_full_unstemmed | Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title_short | Benzene Adsorption from Dry and Humid Air on Activated Carbons from Japanese Cypress Wood Prepared by CO2 and K2CO3 Activation |
| title_sort | benzene adsorption from dry and humid air on activated carbons from japanese cypress wood prepared by co2 and k2co3 activation |
| topic | Activated carbon Benzene adsorption |
| url | https://hdl.handle.net/10356/83335 http://hdl.handle.net/10220/42518 |
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