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Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite

Many attempts have been made to improve the photocatalytic performance of immobilized photocatalysts for large-scale applications by modification of the photocatalyst properties. In this work, immobilized bilayer photocatalyst composed of titanium dioxide (TiO2) and chitosan–montmorillonite (CS–MT)...

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Main Authors: Bahrudin, Noor Nazihah, Nawi, Mohd Asri, Zainal, Zulkarnain, Schneider, Raphaël, Sabar, Sumiyyah
Format: Article
Language:English
Published: IWA Publishing 2020
Online Access:http://psasir.upm.edu.my/id/eprint/88802/1/TITA.pdf
http://psasir.upm.edu.my/id/eprint/88802/
https://iwaponline.com/wst/article/82/3/454/75717/Enhanced-decolourization-of-methyl-orange-by
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spelling my.upm.eprints.888022021-10-06T03:07:46Z http://psasir.upm.edu.my/id/eprint/88802/ Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite Bahrudin, Noor Nazihah Nawi, Mohd Asri Zainal, Zulkarnain Schneider, Raphaël Sabar, Sumiyyah Many attempts have been made to improve the photocatalytic performance of immobilized photocatalysts for large-scale applications by modification of the photocatalyst properties. In this work, immobilized bilayer photocatalyst composed of titanium dioxide (TiO2) and chitosan–montmorillonite (CS–MT) were prepared in a layer-by-layer arrangement supported on glass substrate. This arrangement allows a simultaneous occurrence of adsorption and photocatalysis processes of pollutants, whereby each layer could be independently modified and controlled to acquire the desired degree of occurring processes. It was found that the addition of MT clay within the CS composite sub-layer improved the mechanical strength of CS, reduced its swelling and shifted its absorption threshold to higher wavelengths. In addition, the band gap energy of the photocatalyst was also reduced to 2.93 eV. The immobilized TiO2/CS–MT exhibited methyl orange (MO) decolourization rate of 0.071 min−1 under light irradiation, which is better than the single TiO2 due to the synergistic processes of adsorption by CS–MT and photocatalysis by TiO2 layer. The MO dye took 6 h to achieve complete mineralization and produced sulfate and nitrate ions as the by-products. Furthermore, the immobilized TiO2/CS–MT could be reused for at least ten cycles of application without significant loss of its activity. IWA Publishing 2020 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/88802/1/TITA.pdf Bahrudin, Noor Nazihah and Nawi, Mohd Asri and Zainal, Zulkarnain and Schneider, Raphaël and Sabar, Sumiyyah (2020) Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite. Water Science and Technology, 82 (3). 454 - 467. ISSN 0273-1223 https://iwaponline.com/wst/article/82/3/454/75717/Enhanced-decolourization-of-methyl-orange-by 10.2166/wst.2020.349
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Many attempts have been made to improve the photocatalytic performance of immobilized photocatalysts for large-scale applications by modification of the photocatalyst properties. In this work, immobilized bilayer photocatalyst composed of titanium dioxide (TiO2) and chitosan–montmorillonite (CS–MT) were prepared in a layer-by-layer arrangement supported on glass substrate. This arrangement allows a simultaneous occurrence of adsorption and photocatalysis processes of pollutants, whereby each layer could be independently modified and controlled to acquire the desired degree of occurring processes. It was found that the addition of MT clay within the CS composite sub-layer improved the mechanical strength of CS, reduced its swelling and shifted its absorption threshold to higher wavelengths. In addition, the band gap energy of the photocatalyst was also reduced to 2.93 eV. The immobilized TiO2/CS–MT exhibited methyl orange (MO) decolourization rate of 0.071 min−1 under light irradiation, which is better than the single TiO2 due to the synergistic processes of adsorption by CS–MT and photocatalysis by TiO2 layer. The MO dye took 6 h to achieve complete mineralization and produced sulfate and nitrate ions as the by-products. Furthermore, the immobilized TiO2/CS–MT could be reused for at least ten cycles of application without significant loss of its activity.
format Article
author Bahrudin, Noor Nazihah
Nawi, Mohd Asri
Zainal, Zulkarnain
Schneider, Raphaël
Sabar, Sumiyyah
spellingShingle Bahrudin, Noor Nazihah
Nawi, Mohd Asri
Zainal, Zulkarnain
Schneider, Raphaël
Sabar, Sumiyyah
Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
author_facet Bahrudin, Noor Nazihah
Nawi, Mohd Asri
Zainal, Zulkarnain
Schneider, Raphaël
Sabar, Sumiyyah
author_sort Bahrudin, Noor Nazihah
title Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
title_short Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
title_full Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
title_fullStr Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
title_full_unstemmed Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite
title_sort enhanced decolourization of methyl orange by immobilized tio2/chitosan-montmorillonite
publisher IWA Publishing
publishDate 2020
url http://psasir.upm.edu.my/id/eprint/88802/1/TITA.pdf
http://psasir.upm.edu.my/id/eprint/88802/
https://iwaponline.com/wst/article/82/3/454/75717/Enhanced-decolourization-of-methyl-orange-by
_version_ 1713201306413301760
score 13.211869

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