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)...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/88802/1/TITA.pdf |
| _version_ | 1825936573545316352 |
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| author | Bahrudin, Noor Nazihah Nawi, Mohd Asri Zainal, Zulkarnain Schneider, Raphaël Sabar, Sumiyyah |
| author_facet | Bahrudin, Noor Nazihah Nawi, Mohd Asri Zainal, Zulkarnain Schneider, Raphaël Sabar, Sumiyyah |
| author_sort | Bahrudin, Noor Nazihah |
| collection | UPM |
| 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. |
| first_indexed | 2024-03-06T10:46:20Z |
| format | Article |
| id | upm.eprints-88802 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T10:46:20Z |
| publishDate | 2020 |
| publisher | IWA Publishing |
| record_format | dspace |
| spelling | 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 |
| spellingShingle | Bahrudin, Noor Nazihah Nawi, Mohd Asri Zainal, Zulkarnain Schneider, Raphaël Sabar, Sumiyyah Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite |
| title | 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_short | Enhanced decolourization of methyl orange by immobilized TiO2/chitosan-montmorillonite |
| title_sort | enhanced decolourization of methyl orange by immobilized tio2 chitosan montmorillonite |
| url | http://psasir.upm.edu.my/id/eprint/88802/1/TITA.pdf |
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