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Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies

A facile synthesis procedure of mesoporous carbons coated monolith (MCCM) adsorbent was accomplished using furfuryl alcohol as carbon precursor, triblock copolymer Pluronic F-127 as the structure-directing agent, pyrrole as the binder for polymerization with nitric acid as catalyst and inorganic cor...

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Main Authors: How, Cai-Kian, Soltani, Soroush, Chuah, Teong-Guan, Phuah, Eng-Tong, Choong, Thomas Shean-Yaw
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Published: Springer 2022
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spelling oai:psasir.upm.edu.my:100134 http://psasir.upm.edu.my/id/eprint/100134/ Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies How, Cai-Kian Soltani, Soroush Chuah, Teong-Guan Phuah, Eng-Tong Choong, Thomas Shean-Yaw A facile synthesis procedure of mesoporous carbons coated monolith (MCCM) adsorbent was accomplished using furfuryl alcohol as carbon precursor, triblock copolymer Pluronic F-127 as the structure-directing agent, pyrrole as the binder for polymerization with nitric acid as catalyst and inorganic cordierite as substrate through dip-coating method. Surface chemistry revealed the dominance of acidic sites over adsorbents surface with the majority of active sites occupied by the phenolic and carboxylic groups. The MCCM adsorbent exhibited representative Type IV isotherm with a uniform-distributed PSD plot centered at 6.18 nm. A thermodynamics study involving Langmuir and Freundlich models was applied to establish the adsorption equilibrium data at temperatures of 30 to 50 °C. The Freundlich model best described the experiment data with maximum adsorption capacity of β-carotene onto MCCM was 192.64 mg/g. Three kinetic models, Lagergren first-order, pseudo-second-order and intra-particle diffusion models, were employed to investigate the adsorption mechanism of β-carotene molecules onto active surface sites of MCCM adsorbent. Both the Lagergren first-order and pseudo-second-order kinetic models fitted with experimental data with the latter described perfectly with higher regression coefficient value (R2>0.99). Intra-particle diffusion featured the involvement in β-carotene adsorption mechanism, but it was not the sole rate-limiting step. The negative value of Gibbs free energy change (ΔGo) suggested the spontaneity of β-carotene adsorption process. In contrast, the positive values of enthalpy change (ΔHo) and entropy change (ΔSo) demonstrated the endothermic nature and entropy-driven of the adsorption process, respectively. The increased ΔGo with T indicated an increased degree of spontaneity at high temperatures. Regeneration studies of MCCM adsorbent exemplified a slight decrease in adsorption capacities after three consecutive regeneration cycles. Springer 2022-10-14 Article PeerReviewed How, Cai-Kian and Soltani, Soroush and Chuah, Teong-Guan and Phuah, Eng-Tong and Choong, Thomas Shean-Yaw (2022) Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies. Korean Journal of Chemical Engineering, 39. pp. 3109-3120. ISSN 0256-1115; ESSN: 1975-7220 https://link.springer.com/article/10.1007/s11814-022-1220-2 10.1007/s11814-022-1220-2
institution UPM IR
collection UPM IR
description A facile synthesis procedure of mesoporous carbons coated monolith (MCCM) adsorbent was accomplished using furfuryl alcohol as carbon precursor, triblock copolymer Pluronic F-127 as the structure-directing agent, pyrrole as the binder for polymerization with nitric acid as catalyst and inorganic cordierite as substrate through dip-coating method. Surface chemistry revealed the dominance of acidic sites over adsorbents surface with the majority of active sites occupied by the phenolic and carboxylic groups. The MCCM adsorbent exhibited representative Type IV isotherm with a uniform-distributed PSD plot centered at 6.18 nm. A thermodynamics study involving Langmuir and Freundlich models was applied to establish the adsorption equilibrium data at temperatures of 30 to 50 °C. The Freundlich model best described the experiment data with maximum adsorption capacity of β-carotene onto MCCM was 192.64 mg/g. Three kinetic models, Lagergren first-order, pseudo-second-order and intra-particle diffusion models, were employed to investigate the adsorption mechanism of β-carotene molecules onto active surface sites of MCCM adsorbent. Both the Lagergren first-order and pseudo-second-order kinetic models fitted with experimental data with the latter described perfectly with higher regression coefficient value (R2>0.99). Intra-particle diffusion featured the involvement in β-carotene adsorption mechanism, but it was not the sole rate-limiting step. The negative value of Gibbs free energy change (ΔGo) suggested the spontaneity of β-carotene adsorption process. In contrast, the positive values of enthalpy change (ΔHo) and entropy change (ΔSo) demonstrated the endothermic nature and entropy-driven of the adsorption process, respectively. The increased ΔGo with T indicated an increased degree of spontaneity at high temperatures. Regeneration studies of MCCM adsorbent exemplified a slight decrease in adsorption capacities after three consecutive regeneration cycles.
format Article
author How, Cai-Kian
Soltani, Soroush
Chuah, Teong-Guan
Phuah, Eng-Tong
Choong, Thomas Shean-Yaw
spellingShingle How, Cai-Kian
Soltani, Soroush
Chuah, Teong-Guan
Phuah, Eng-Tong
Choong, Thomas Shean-Yaw
Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
author_facet How, Cai-Kian
Soltani, Soroush
Chuah, Teong-Guan
Phuah, Eng-Tong
Choong, Thomas Shean-Yaw
author_sort How, Cai-Kian
title Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
title_short Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
title_full Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
title_fullStr Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
title_full_unstemmed Adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
title_sort adsorption properties of β-carotene on mesoporous carbon-coated honeycomb monolith: kinetics, thermodynamics, and regeneration studies
publisher Springer
publishDate 2022
_version_ 1819301159092879360
score 13.4562235

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