A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions

Catalytic wet air oxidation (CWAO), one of the best-known methods for water treatment, has been intensely investigated for dyes degradation. However, the extreme operation conditions as well as the recovery of suspended catalyst are economically unattractive. In the current work, a novel Mo-based na...

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Main Authors: Bao, Yueping, Lee, Wen Jie, Wang, Penghua, Xing, Jiajian, Liang, Yen Nan, Lim, Teik-Thye, Hu, Xiao
Other Authors: Interdisciplinary Graduate School (IGS)
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/160954
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1609542022-08-08T07:49:19Z A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions Bao, Yueping Lee, Wen Jie Wang, Penghua Xing, Jiajian Liang, Yen Nan Lim, Teik-Thye Hu, Xiao Interdisciplinary Graduate School (IGS) School of Civil and Environmental Engineering School of Materials Science and Engineering Nanyang Environment and Water Research Institute Engineering::Environmental engineering Ambient Condition Catalytic Membrane Catalytic wet air oxidation (CWAO), one of the best-known methods for water treatment, has been intensely investigated for dyes degradation. However, the extreme operation conditions as well as the recovery of suspended catalyst are economically unattractive. In the current work, a novel Mo-based nanocrystal decorated ceramic membrane (Mo/Al2O3) has been prepared and applied for organics degradation via CWAO at ambient conditions for the first time. The catalytic Mo/Al2O3 membranes were prepared by an in-situ hydrothermal followed by calcination method. Their physical and chemical properties were characterized by field emission scanning electron microscope (FESEM), X-rays diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The catalytic performance of Mo/Al2O3 membranes were evaluated via organics (safranine O and humic acid) degradation under a home-made membrane filtration system. The effects of calcination temperature, catalyst loading amount, and trans-membrane pressure (TMP) were systematically investigated. The stability and durability of the catalytic Mo/Al2O3 membrane were examined in a long-term filtration system. Results showed that the performance of Mo/Al2O3 membrane would decrease with increasing of calcination temperature as well as TMP. However, the catalyst loading amount was not a major effect on the removal of organics in the system. For one-time loading membrane calcined at 300 °C (1x-Mo/Al2O3 membrane@300), the removal efficiency could achieve higher than 90 % in 40 min in a recycled filtration system with an initial safranine O concentration of 10 mg L−1. The chemical quenching experiment as well as radical quantification verified the main reactive oxygen species were 1O2 and [rad]O2− in the system. The ROS generation mechanism was proposed via the characterization of the catalyst after reaction. The deliberate combination of CWAO and membrane separation represents a new strategy that offers exciting possibilities for water treatment under ambient conditions. Nanyang Technological University Financial support for this project is provided by the Ph.D. research scholarship from NTU. 2022-08-08T07:49:19Z 2022-08-08T07:49:19Z 2021 Journal Article Bao, Y., Lee, W. J., Wang, P., Xing, J., Liang, Y. N., Lim, T. & Hu, X. (2021). A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions. Catalysis Today, 364, 276-284. https://dx.doi.org/10.1016/j.cattod.2020.02.008 0920-5861 https://hdl.handle.net/10356/160954 10.1016/j.cattod.2020.02.008 2-s2.0-85083003622 364 276 284 en Catalysis Today © 2020 Published by Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
Ambient Condition
Catalytic Membrane
spellingShingle Engineering::Environmental engineering
Ambient Condition
Catalytic Membrane
Bao, Yueping
Lee, Wen Jie
Wang, Penghua
Xing, Jiajian
Liang, Yen Nan
Lim, Teik-Thye
Hu, Xiao
A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
description Catalytic wet air oxidation (CWAO), one of the best-known methods for water treatment, has been intensely investigated for dyes degradation. However, the extreme operation conditions as well as the recovery of suspended catalyst are economically unattractive. In the current work, a novel Mo-based nanocrystal decorated ceramic membrane (Mo/Al2O3) has been prepared and applied for organics degradation via CWAO at ambient conditions for the first time. The catalytic Mo/Al2O3 membranes were prepared by an in-situ hydrothermal followed by calcination method. Their physical and chemical properties were characterized by field emission scanning electron microscope (FESEM), X-rays diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The catalytic performance of Mo/Al2O3 membranes were evaluated via organics (safranine O and humic acid) degradation under a home-made membrane filtration system. The effects of calcination temperature, catalyst loading amount, and trans-membrane pressure (TMP) were systematically investigated. The stability and durability of the catalytic Mo/Al2O3 membrane were examined in a long-term filtration system. Results showed that the performance of Mo/Al2O3 membrane would decrease with increasing of calcination temperature as well as TMP. However, the catalyst loading amount was not a major effect on the removal of organics in the system. For one-time loading membrane calcined at 300 °C (1x-Mo/Al2O3 membrane@300), the removal efficiency could achieve higher than 90 % in 40 min in a recycled filtration system with an initial safranine O concentration of 10 mg L−1. The chemical quenching experiment as well as radical quantification verified the main reactive oxygen species were 1O2 and [rad]O2− in the system. The ROS generation mechanism was proposed via the characterization of the catalyst after reaction. The deliberate combination of CWAO and membrane separation represents a new strategy that offers exciting possibilities for water treatment under ambient conditions.
author2 Interdisciplinary Graduate School (IGS)
author_facet Interdisciplinary Graduate School (IGS)
Bao, Yueping
Lee, Wen Jie
Wang, Penghua
Xing, Jiajian
Liang, Yen Nan
Lim, Teik-Thye
Hu, Xiao
format Article
author Bao, Yueping
Lee, Wen Jie
Wang, Penghua
Xing, Jiajian
Liang, Yen Nan
Lim, Teik-Thye
Hu, Xiao
author_sort Bao, Yueping
title A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
title_short A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
title_full A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
title_fullStr A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
title_full_unstemmed A novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (CWAO) at ambient conditions
title_sort novel molybdenum-based nanocrystal decorated ceramic membrane for organics degradation via catalytic wet air oxidation (cwao) at ambient conditions
publishDate 2022
url https://hdl.handle.net/10356/160954
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