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Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation

Chedly Tizaoui Orcid Logo, Haydar Mohammad-Salim, Jono Suhartono

Ozone: Science & Engineering, Volume: 37, Issue: 3, Pages: 269 - 278

Swansea University Author: Chedly Tizaoui Orcid Logo

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DOI (Published version): 10.1080/01919512.2014.983455

Abstract

Multiwalled carbon nanotubes functionalized by plasma oxygen (CNTs) have been used as heterogeneous catalysts for the ozonation of methyl orange (MO) dye (CI 13025) in aqueous solutions. It was found that the addition of CNTs significantly enhanced the dye decolorization as compared to ozone alone o...

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Published in: Ozone: Science & Engineering
ISSN: 0191-9512 1547-6545
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa23856
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spelling 2018-04-29T13:44:53.7922723 v2 23856 2015-10-18 Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation 4b34a0286d3c0b0b081518fa6987031d 0000-0003-2159-7881 Chedly Tizaoui Chedly Tizaoui true false 2015-10-18 CHEG Multiwalled carbon nanotubes functionalized by plasma oxygen (CNTs) have been used as heterogeneous catalysts for the ozonation of methyl orange (MO) dye (CI 13025) in aqueous solutions. It was found that the addition of CNTs significantly enhanced the dye decolorization as compared to ozone alone or when activated carbon was used at the same dose as CNTs. Both the initial ozone concentration and catalyst dosage enhanced the removal of MO. However, ozone gas concentrations higher than 6 g/m3 NTP did not further improve the decolorization rates. The removal efficiency of MO increased with pH in the range 2 to 3, while a reverse trend was observed when the pH increased from 3 to 9. The addition of a radical scavenger resulted in only a limited change in the decolorization rates suggesting that molecular ozone was the main pathway by which MO decolorization occurred in solution. However, under favorable conditions for MO attraction to CNT surface (pH = 3), the decolorization rate has significantly increased. At higher pH than the pKa value of MO (3.47) and the point of zero charge of CNT (3.87), a condition that favors the electrostatic repulsion of MO from CNT, the rates were reduced in the presence of CNT as compared to ozone alone possibly due to loss of part of the supplied ozone in un-useful parallel reactions. Journal Article Ozone: Science & Engineering 37 3 269 278 0191-9512 1547-6545 Ozone, Advanced oxidation, Multi-walled carbon nanotube, Catalytic ozonation, Nanocatalysis, Methyl orange dye 31 12 2015 2015-12-31 10.1080/01919512.2014.983455 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2018-04-29T13:44:53.7922723 2015-10-18T12:56:12.8819142 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Chedly Tizaoui 0000-0003-2159-7881 1 Haydar Mohammad-Salim 2 Jono Suhartono 3 0023856-18102015125703.pdf 2015_NanocatCNTO3_OSE_CTizaoui.pdf 2015-10-18T12:57:03.1930000 Output 275547 application/pdf Accepted Manuscript true 2015-10-18T00:00:00.0000000 false
title Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
spellingShingle Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
Chedly Tizaoui
title_short Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
title_full Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
title_fullStr Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
title_full_unstemmed Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
title_sort Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation
author_id_str_mv 4b34a0286d3c0b0b081518fa6987031d
author_id_fullname_str_mv 4b34a0286d3c0b0b081518fa6987031d_***_Chedly Tizaoui
author Chedly Tizaoui
author2 Chedly Tizaoui
Haydar Mohammad-Salim
Jono Suhartono
format Journal article
container_title Ozone: Science & Engineering
container_volume 37
container_issue 3
container_start_page 269
publishDate 2015
institution Swansea University
issn 0191-9512
1547-6545
doi_str_mv 10.1080/01919512.2014.983455
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Multiwalled carbon nanotubes functionalized by plasma oxygen (CNTs) have been used as heterogeneous catalysts for the ozonation of methyl orange (MO) dye (CI 13025) in aqueous solutions. It was found that the addition of CNTs significantly enhanced the dye decolorization as compared to ozone alone or when activated carbon was used at the same dose as CNTs. Both the initial ozone concentration and catalyst dosage enhanced the removal of MO. However, ozone gas concentrations higher than 6 g/m3 NTP did not further improve the decolorization rates. The removal efficiency of MO increased with pH in the range 2 to 3, while a reverse trend was observed when the pH increased from 3 to 9. The addition of a radical scavenger resulted in only a limited change in the decolorization rates suggesting that molecular ozone was the main pathway by which MO decolorization occurred in solution. However, under favorable conditions for MO attraction to CNT surface (pH = 3), the decolorization rate has significantly increased. At higher pH than the pKa value of MO (3.47) and the point of zero charge of CNT (3.87), a condition that favors the electrostatic repulsion of MO from CNT, the rates were reduced in the presence of CNT as compared to ozone alone possibly due to loss of part of the supplied ozone in un-useful parallel reactions.
published_date 2015-12-31T03:28:14Z
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score 11.037603

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