Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation
A novel Co3O4 nanocatalyst functionalized Al2O3 ceramic membrane (CoFCM) with a honeycomb structure was prepared via an optimized surface-nucleated zeolitic imidazolate framework (ZIF-67) growth method. The Co3O4 hollow structure which was confirmed via chemical characterizations (XRD, FTIR, Raman...
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sg-ntu-dr.10356-1370202020-11-01T04:45:43Z Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation Bao,Yueping Oh, Wen-Da Lim, Teik-Thye Wang, Rong Webster, Richard David Hu, Xiao School of Civil and Environmental Engineering School of Materials Science & Engineering School of Physical and Mathematical Sciences Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Engineering::Materials MOF-Template Heterogeneous Growth A novel Co3O4 nanocatalyst functionalized Al2O3 ceramic membrane (CoFCM) with a honeycomb structure was prepared via an optimized surface-nucleated zeolitic imidazolate framework (ZIF-67) growth method. The Co3O4 hollow structure which was confirmed via chemical characterizations (XRD, FTIR, Raman and XPS), was formed on the membrane surface by one-step calcination of ZIF-67 membrane. The CoFCM was characterized by various techniques including the field emission scanning electron microscopy and atomic force microscopy. The results revealed the formation of well-defined Co3O4 layer on the porous Al2O3 ceramic membrane with the thickness of 1.5–2 µm. The growth mechanism of CoFCM was further proposed via XPS and the catalytic activity of CoFCM was investigated for the removal of sulfamethoxazole (SMX) with the addition of Oxone. The membrane performance was examined under a home-made dead-end mode. Results indicated that CoFCM has a rougher surface with an initial membrane resistance of 1.19 × 1011 m−1 and performs outstanding catalytic activity. The pure water permeability of CoFCM is 3024 L m−2 h−1 bar−1 , which is comparable to that of the pristine ceramic membrane (< 10% difference). The SMX removal efficiency achieved to > 90% in 90 min with an Oxone addition of 0.1 g L−1 . Meanwhile, the membrane showed excellent durability by retaining > 95% of initial flux for at least 3 operational cycles with a low cobalt ion leaching via Oxone-assisted cleaning. Furthermore, the reaction mechanism of Oxone activation by CoFCM was proposed from the results of the electron paramagnetic resonance (EPR) and radical scavenger experiments. Accepted version 2020-02-12T08:45:53Z 2020-02-12T08:45:53Z 2018 Journal Article Bao, Y., Oh, W.-D., Lim, T.-T., Wang, R., Webster, R. D., & Hu, X. (2018). Surface-nucleated heterogeneous growth of zeolitic imidazolate framework – a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation. Chemical Engineering Journal, 353, 69-79. doi:10.1016/j.cej.2018.07.117 1385-8947 https://hdl.handle.net/10356/137020 10.1016/j.cej.2018.07.117 2-s2.0-85050149022 353 69 79 en Chemical Engineering Journal © 2018 Elsevier B.V. All rights reserved. This paper was published in Chemical Engineering Journal and is made available with permission of Elsevier B.V. application/pdf |
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Engineering::Materials MOF-Template Heterogeneous Growth Bao,Yueping Oh, Wen-Da Lim, Teik-Thye Wang, Rong Webster, Richard David Hu, Xiao Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
description |
A novel Co3O4 nanocatalyst functionalized Al2O3 ceramic membrane (CoFCM) with a honeycomb structure was
prepared via an optimized surface-nucleated zeolitic imidazolate framework (ZIF-67) growth method. The Co3O4
hollow structure which was confirmed via chemical characterizations (XRD, FTIR, Raman and XPS), was formed
on the membrane surface by one-step calcination of ZIF-67 membrane. The CoFCM was characterized by various
techniques including the field emission scanning electron microscopy and atomic force microscopy. The results
revealed the formation of well-defined Co3O4 layer on the porous Al2O3 ceramic membrane with the thickness of
1.5–2 µm. The growth mechanism of CoFCM was further proposed via XPS and the catalytic activity of CoFCM
was investigated for the removal of sulfamethoxazole (SMX) with the addition of Oxone. The membrane performance was examined under a home-made dead-end mode. Results indicated that CoFCM has a rougher
surface with an initial membrane resistance of 1.19 × 1011 m−1 and performs outstanding catalytic activity. The
pure water permeability of CoFCM is 3024 L m−2 h−1 bar−1
, which is comparable to that of the pristine ceramic
membrane (< 10% difference). The SMX removal efficiency achieved to > 90% in 90 min with an Oxone addition of 0.1 g L−1
. Meanwhile, the membrane showed excellent durability by retaining > 95% of initial flux for
at least 3 operational cycles with a low cobalt ion leaching via Oxone-assisted cleaning. Furthermore, the reaction mechanism of Oxone activation by CoFCM was proposed from the results of the electron paramagnetic
resonance (EPR) and radical scavenger experiments. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Bao,Yueping Oh, Wen-Da Lim, Teik-Thye Wang, Rong Webster, Richard David Hu, Xiao |
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Article |
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Bao,Yueping Oh, Wen-Da Lim, Teik-Thye Wang, Rong Webster, Richard David Hu, Xiao |
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Bao,Yueping |
title |
Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
title_short |
Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
title_full |
Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
title_fullStr |
Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
title_full_unstemmed |
Surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
title_sort |
surface-nucleated heterogeneous growth of zeolitic imidazolate framework - a unique precursor towards catalytic ceramic membranes : synthesis, characterization and organics degradation |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/137020 |
_version_ |
1683494363503525888 |