Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies
Carbon-coated monoliths (CCMs) were chemically modified by sodium hydroxide (NaOH) and ammonia aqueous solution (NH3) in order to enhance phenol adsorption. The adsorptive performance of phenol onto CCM-NaOH and CCM-NH3 was comparatively evaluated by batch mode. Experiments were carried out by varyi...
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Taylor & Francis
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/47478/ http://psasir.upm.edu.my/id/eprint/47478/1/Enhancement%20of%20phenol%20adsorption%20on%20mesoporous%20carbon%20monolith%20modified%20by%20NaOH%20and%20NH3%20equilibrium%20and%20kinetic%20studies.pdf |
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| author | Yam, Lai Wai Lim, Lishan Hosseini, Soraya Choong, Thomas Shean Yaw |
| author_facet | Yam, Lai Wai Lim, Lishan Hosseini, Soraya Choong, Thomas Shean Yaw |
| author_sort | Yam, Lai Wai |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Carbon-coated monoliths (CCMs) were chemically modified by sodium hydroxide (NaOH) and ammonia aqueous solution (NH3) in order to enhance phenol adsorption. The adsorptive performance of phenol onto CCM-NaOH and CCM-NH3 was comparatively evaluated by batch mode. Experiments were carried out by varying pH, contact time, and initial adsorbate concentration. The optimum molarities for modification were 1.5 M NaOH and 2 M NH3 solutions. The basicity groups of modified CCM were 0.198 and 0.339 mmol g−1 for CCM-NaOH and CCM-NH3 by Boehm titration method, respectively. The presence of basic groups (O–H and NH3) was also confirmed by FT-IR. The studies showed optimum phenol adsorption, at pH 4 for both adsorbents. As compared to unmodified CCM, the CCM-NH3 and CCM-NaOH enhanced phenol uptake by 16.5 and 9.7%, respectively. The maximum equilibrium adsorption capacities were 51.29 ± 0.7 mg g−1 for CCM-NaOH and 54.45 ± 0.7 mg g−1 for CCM-NH3 in the range of concentration 50–350 mg L−1. The equilibrium adsorption data for CCM-NaOH and CCM-NH3 was fitted to both Langmuir and Freundlich models. Kinetic studies of both modified CCMs showed better applicability of pseudo-second-order kinetics model. The regeneration studies showed a 26% drop in adsorption capacity after four cycles for CCM-NH3. |
| first_indexed | 2025-11-15T10:12:27Z |
| format | Article |
| id | upm-47478 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T10:12:27Z |
| publishDate | 2016 |
| publisher | Taylor & Francis |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-474782016-05-20T02:06:10Z http://psasir.upm.edu.my/id/eprint/47478/ Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies Yam, Lai Wai Lim, Lishan Hosseini, Soraya Choong, Thomas Shean Yaw Carbon-coated monoliths (CCMs) were chemically modified by sodium hydroxide (NaOH) and ammonia aqueous solution (NH3) in order to enhance phenol adsorption. The adsorptive performance of phenol onto CCM-NaOH and CCM-NH3 was comparatively evaluated by batch mode. Experiments were carried out by varying pH, contact time, and initial adsorbate concentration. The optimum molarities for modification were 1.5 M NaOH and 2 M NH3 solutions. The basicity groups of modified CCM were 0.198 and 0.339 mmol g−1 for CCM-NaOH and CCM-NH3 by Boehm titration method, respectively. The presence of basic groups (O–H and NH3) was also confirmed by FT-IR. The studies showed optimum phenol adsorption, at pH 4 for both adsorbents. As compared to unmodified CCM, the CCM-NH3 and CCM-NaOH enhanced phenol uptake by 16.5 and 9.7%, respectively. The maximum equilibrium adsorption capacities were 51.29 ± 0.7 mg g−1 for CCM-NaOH and 54.45 ± 0.7 mg g−1 for CCM-NH3 in the range of concentration 50–350 mg L−1. The equilibrium adsorption data for CCM-NaOH and CCM-NH3 was fitted to both Langmuir and Freundlich models. Kinetic studies of both modified CCMs showed better applicability of pseudo-second-order kinetics model. The regeneration studies showed a 26% drop in adsorption capacity after four cycles for CCM-NH3. Taylor & Francis 2016 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/47478/1/Enhancement%20of%20phenol%20adsorption%20on%20mesoporous%20carbon%20monolith%20modified%20by%20NaOH%20and%20NH3%20equilibrium%20and%20kinetic%20studies.pdf Yam, Lai Wai and Lim, Lishan and Hosseini, Soraya and Choong, Thomas Shean Yaw (2016) Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies. Desalination and Water Treatment, 57 (9). pp. 4183-4193. ISSN 1944-3994; ESSN: 1944-3986 http://www.tandfonline.com/doi/abs/10.1080/19443994.2014.993714?journalCode=tdwt20 10.1080/19443994.2014.993714 |
| spellingShingle | Yam, Lai Wai Lim, Lishan Hosseini, Soraya Choong, Thomas Shean Yaw Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title | Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title_full | Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title_fullStr | Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title_full_unstemmed | Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title_short | Enhancement of phenol adsorption on mesoporous carbon monolith modified by NaOH and NH3: equilibrium and kinetic studies |
| title_sort | enhancement of phenol adsorption on mesoporous carbon monolith modified by naoh and nh3: equilibrium and kinetic studies |
| url | http://psasir.upm.edu.my/id/eprint/47478/ http://psasir.upm.edu.my/id/eprint/47478/ http://psasir.upm.edu.my/id/eprint/47478/ http://psasir.upm.edu.my/id/eprint/47478/1/Enhancement%20of%20phenol%20adsorption%20on%20mesoporous%20carbon%20monolith%20modified%20by%20NaOH%20and%20NH3%20equilibrium%20and%20kinetic%20studies.pdf |