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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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Hauptverfasser: Yam, Lai Wai, Lim, Lishan, Hosseini, Soraya, Choong, Thomas Shean Yaw
Format: Artikel
Sprache:English
Veröffentlicht: Taylor & Francis 2016
Online Zugang: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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spelling oai:psasir.upm.edu.my:47478 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
institution UPM IR
collection UPM IR
language English
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.
format Article
author Yam, Lai Wai
Lim, Lishan
Hosseini, Soraya
Choong, Thomas Shean Yaw
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
author_facet Yam, Lai Wai
Lim, Lishan
Hosseini, Soraya
Choong, Thomas Shean Yaw
author_sort Yam, Lai Wai
title 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_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_sort enhancement of phenol adsorption on mesoporous carbon monolith modified by naoh and nh3: equilibrium and kinetic studies
publisher Taylor & Francis
publishDate 2016
url 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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score 13.4562235

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