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Acid modified carbon coated monolith for methyl orange adsorption

Carbon coated monolith (CCM) was chemically modified by treating with nitric acid. The acid modified carbon coated monolith (ACCM) was then characterized by using various techniques. Two folds increase in acidic sites was observed on ACCM compared to CCM. Surface studies showed mesoporous nature of...

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Main Authors: Cheah, Willie, Hosseini, Soraya, Khan, Moonis Ali, Abdullah, Luqman Chuah, Choong, Thomas Shean Yaw
פורמט: Article
שפה:English
יצא לאור: Elsevier 2013
גישה מקוונת:http://psasir.upm.edu.my/id/eprint/28777/1/Acid%20modified%20carbon%20coated%20monolith%20for%20methyl%20orange%20adsorption.pdf
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spelling oai:psasir.upm.edu.my:28777 http://psasir.upm.edu.my/id/eprint/28777/ Acid modified carbon coated monolith for methyl orange adsorption Cheah, Willie Hosseini, Soraya Khan, Moonis Ali Abdullah, Luqman Chuah Choong, Thomas Shean Yaw Carbon coated monolith (CCM) was chemically modified by treating with nitric acid. The acid modified carbon coated monolith (ACCM) was then characterized by using various techniques. Two folds increase in acidic sites was observed on ACCM compared to CCM. Surface studies showed mesoporous nature of ACCM. A decrease in ACCM surface area and an increase in pore volume observed after the modification. The ATR-FT-IR studies showed increase in carboxylic groups on ACCM confirming CCM oxidation by nitric acid. The pH studies showed optimum adsorption (88 mg/g) at pH 6 which is very near to pHPZC of ACCM. Contact time studies showed equilibration time in between 4320 and 4560 min for initial MO concentration range 0.05–0.6 g/L. Comparatively 53% higher MO adsorption was observed on ACCM than CCM under similar experimental conditions. Freundlich model applicability confirms multilayer MO adsorption on ACCM surface. Pseudo-second-order kinetics model was fitted best to the experimental data revealing chemical nature of adsorption process. The adsorption process is endothermic and spontaneous in nature. Desorption studies showed optimum MO recovery (73%) when 1 N NaOH was used as an eluent. Elsevier 2013-01 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/28777/1/Acid%20modified%20carbon%20coated%20monolith%20for%20methyl%20orange%20adsorption.pdf Cheah, Willie and Hosseini, Soraya and Khan, Moonis Ali and Abdullah, Luqman Chuah and Choong, Thomas Shean Yaw (2013) Acid modified carbon coated monolith for methyl orange adsorption. Chemical Engineering Journal, 215-216. pp. 747-754. ISSN 1385-8947
institution UPM IR
collection UPM IR
language English
description Carbon coated monolith (CCM) was chemically modified by treating with nitric acid. The acid modified carbon coated monolith (ACCM) was then characterized by using various techniques. Two folds increase in acidic sites was observed on ACCM compared to CCM. Surface studies showed mesoporous nature of ACCM. A decrease in ACCM surface area and an increase in pore volume observed after the modification. The ATR-FT-IR studies showed increase in carboxylic groups on ACCM confirming CCM oxidation by nitric acid. The pH studies showed optimum adsorption (88 mg/g) at pH 6 which is very near to pHPZC of ACCM. Contact time studies showed equilibration time in between 4320 and 4560 min for initial MO concentration range 0.05–0.6 g/L. Comparatively 53% higher MO adsorption was observed on ACCM than CCM under similar experimental conditions. Freundlich model applicability confirms multilayer MO adsorption on ACCM surface. Pseudo-second-order kinetics model was fitted best to the experimental data revealing chemical nature of adsorption process. The adsorption process is endothermic and spontaneous in nature. Desorption studies showed optimum MO recovery (73%) when 1 N NaOH was used as an eluent.
format Article
author Cheah, Willie
Hosseini, Soraya
Khan, Moonis Ali
Abdullah, Luqman Chuah
Choong, Thomas Shean Yaw
spellingShingle Cheah, Willie
Hosseini, Soraya
Khan, Moonis Ali
Abdullah, Luqman Chuah
Choong, Thomas Shean Yaw
Acid modified carbon coated monolith for methyl orange adsorption
author_facet Cheah, Willie
Hosseini, Soraya
Khan, Moonis Ali
Abdullah, Luqman Chuah
Choong, Thomas Shean Yaw
author_sort Cheah, Willie
title Acid modified carbon coated monolith for methyl orange adsorption
title_short Acid modified carbon coated monolith for methyl orange adsorption
title_full Acid modified carbon coated monolith for methyl orange adsorption
title_fullStr Acid modified carbon coated monolith for methyl orange adsorption
title_full_unstemmed Acid modified carbon coated monolith for methyl orange adsorption
title_sort acid modified carbon coated monolith for methyl orange adsorption
publisher Elsevier
publishDate 2013
url http://psasir.upm.edu.my/id/eprint/28777/1/Acid%20modified%20carbon%20coated%20monolith%20for%20methyl%20orange%20adsorption.pdf
_version_ 1819295162297221120
score 13.4562235

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