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Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet

Reverse osmosis (RO) is a mature desalination technology that provides an effective solution to solve global water scarcity issues. In this study, thin film nanocomposite (TFN) membrane for RO desalination was fabricated by depositing positively charged titania nanosheet (pTNS) and negatively charge...

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Main Authors: Ahmad, N. A., Goh, P. S., Wong, K. C., Zulhairun, A. K., Ismail, A. F.
Format: Article
Published: Elsevier BV. 2020
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/88017/
http://www.dx.doi.org/10.1016/j.desal.2019.114167
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spelling my.utm.880172020-11-30T13:50:43Z http://eprints.utm.my/id/eprint/88017/ Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet Ahmad, N. A. Goh, P. S. Wong, K. C. Zulhairun, A. K. Ismail, A. F. TP Chemical technology Reverse osmosis (RO) is a mature desalination technology that provides an effective solution to solve global water scarcity issues. In this study, thin film nanocomposite (TFN) membrane for RO desalination was fabricated by depositing positively charged titania nanosheet (pTNS) and negatively charged titania nanosheet (nTNS) on the surface of polyamide (PA) layer through layer by layer (LbL) assembly. The pTNS was synthesized through solid-state calcination and acid ion-exchange. Though the additional step of exfoliation, single sheet nTNS with improved hydrophilicity property was obtained. The hydration layer created on the surface of TNS-PA could hinder the direct contact of salt ions with the surface of TFN membrane, hence significantly enhance the water permeability and salt rejection. The membrane surface hydrophilicity was improved and surface roughness was decreased with the increasing number of bilayers. However, the excessive pTNS/nTNS bilayer coating has imposed additional hydraulic resistance hence resulted in the reduction of water permeability. The highest water permeability of 0.8 L·m−2·h−1·bar−1 (60% improvement) was achieved with the 2 bilayers of TNS-PA TFN as compared to the pristine PA membrane. The sodium chloride (NaCl) rejection was 98.45% which was also higher than pristine membrane with rejection of 96.65%. Elsevier BV. 2020-02 Article PeerReviewed Ahmad, N. A. and Goh, P. S. and Wong, K. C. and Zulhairun, A. K. and Ismail, A. F. (2020) Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet. Desalination, 476 . http://www.dx.doi.org/10.1016/j.desal.2019.114167 DOI: 10.1016/j.desal.2019.114167
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Ahmad, N. A.
Goh, P. S.
Wong, K. C.
Zulhairun, A. K.
Ismail, A. F.
Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
description Reverse osmosis (RO) is a mature desalination technology that provides an effective solution to solve global water scarcity issues. In this study, thin film nanocomposite (TFN) membrane for RO desalination was fabricated by depositing positively charged titania nanosheet (pTNS) and negatively charged titania nanosheet (nTNS) on the surface of polyamide (PA) layer through layer by layer (LbL) assembly. The pTNS was synthesized through solid-state calcination and acid ion-exchange. Though the additional step of exfoliation, single sheet nTNS with improved hydrophilicity property was obtained. The hydration layer created on the surface of TNS-PA could hinder the direct contact of salt ions with the surface of TFN membrane, hence significantly enhance the water permeability and salt rejection. The membrane surface hydrophilicity was improved and surface roughness was decreased with the increasing number of bilayers. However, the excessive pTNS/nTNS bilayer coating has imposed additional hydraulic resistance hence resulted in the reduction of water permeability. The highest water permeability of 0.8 L·m−2·h−1·bar−1 (60% improvement) was achieved with the 2 bilayers of TNS-PA TFN as compared to the pristine PA membrane. The sodium chloride (NaCl) rejection was 98.45% which was also higher than pristine membrane with rejection of 96.65%.
format Article
author Ahmad, N. A.
Goh, P. S.
Wong, K. C.
Zulhairun, A. K.
Ismail, A. F.
author_facet Ahmad, N. A.
Goh, P. S.
Wong, K. C.
Zulhairun, A. K.
Ismail, A. F.
author_sort Ahmad, N. A.
title Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
title_short Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
title_full Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
title_fullStr Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
title_full_unstemmed Enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
title_sort enhancing desalination performance of thin film composite membrane t through layer by layer assembly of oppositely charged titania nanosheet
publisher Elsevier BV.
publishDate 2020
url http://eprints.utm.my/id/eprint/88017/
http://www.dx.doi.org/10.1016/j.desal.2019.114167
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score 13.211869

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