Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination

Niaz Ali Khan; Niaz Ali Khan; Niaz Ali Khan; Jinqiu Yuan; Jinqiu Yuan; Hong Wu; Hong Wu; Hong Wu; Tong Huang; Tong Huang; Xinda You; Xinda You; Ata Ur Rahman; Chandra S. Azad; Mark A. Olson; Mark A. Olson; Zhongyi Jiang

doi:10.1021/acsami.0c06417

Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination

Niaz Ali Khan, Niaz Ali Khan, Niaz Ali Khan, Jinqiu Yuan, Jinqiu Yuan, Hong Wu^*, Hong Wu^*, Hong Wu^*, Tong Huang, Tong Huang, Xinda You, Xinda You, Ata Ur Rahman, Chandra S. Azad, Mark A. Olson, Mark A. Olson, Zhongyi Jiang^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

Mixed matrix membranes (MMMs) have been increasingly utilized in membrane processes. Covalent organic frameworks (COFs) hold great promise as emergent nanofillers to fabricate high-performance MMMs; however, only few studies about COF materials in MMMs have been reported where COFs are all used as nonreactive fillers. Herein, we propose using -NH2-functionalized COF nanosheets as reactive fillers (rCON) to fabricate MMMs. rCON altered the morphology and chemistry of MMMs by controlling the diffusion rate of piperazine through hydrogen bonding prior to the interfacial polymerization process and inducing the creation of ridges in the MMMs with subsequent increase in surface area (∼24%). rCON was chemically cross-linked to the trimesoyl chloride through amide bonding, subsequently elevating the hydrophilicity (∼35%) and fouling resistance of MMMs. The presence of -NH2 groups elevated the rCON-PA compatibility, ensuring the high rCON loading of 5 wt % in the MMMs without sacrificing salt rejection. Accordingly, the PA-rCON MMMs exhibited a flux of 46.5 L m-2 h-1 bar-1, which is 6.8 times higher than that of the pristine PA membrane, with a high rejection rate of 93.5% for Na2SO4.

Original language	English (US)
Pages (from-to)	27777-27785
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	12
Issue number	24
DOIs	https://doi.org/10.1021/acsami.0c06417
State	Published - Jun 17 2020

Funding

This study was supported by the National Natural Science Foundation of China (2181101169, 21878215, 21621004, 21576189, and 21490583), the International (Regional) Cooperation and Exchange Projects (Research Fund for International Young Scientists) (21850410457), the National Key R&D Program of China (2017YFB0603400 and 2016YFB0600503), the Natural Science Foundation of Tianjin (16JCZDJC36500 and 18JCZDJC36900), and the Program of Introducing Talents of Discipline to Universities (B06006). This study was supported by the National Natural Science Foundation of China (2181101169, 21878215, 21621004, 21576189 and 21490583), the International (Regional) Cooperation and Exchange Projects (Research Fund for International Young Scientists) (21850410457) the National Key R&D Program of China (2017YFB0603400 and 2016YFB0600503) the Natural Science Foundation of Tianjin (16JCZDJC36500 and 18JCZDJC36900) and the Program of Introducing Talents of Discipline to Universities (B06006).

Keywords

covalent organic framework nanosheets
desalination
interfacial polymerization
mixed matrix membranes
reactive fillers

ASJC Scopus subject areas

General Materials Science

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10.1021/acsami.0c06417

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Khan, N. A., Khan, N. A., Khan, N. A., Yuan, J., Yuan, J., Wu, H., Wu, H., Wu, H., Huang, T., Huang, T., You, X., You, X., Rahman, A. U., Azad, C. S., Olson, M. A., Olson, M. A., & Jiang, Z. (2020). Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination. ACS Applied Materials and Interfaces, 12(24), 27777-27785. https://doi.org/10.1021/acsami.0c06417

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abstract = "Mixed matrix membranes (MMMs) have been increasingly utilized in membrane processes. Covalent organic frameworks (COFs) hold great promise as emergent nanofillers to fabricate high-performance MMMs; however, only few studies about COF materials in MMMs have been reported where COFs are all used as nonreactive fillers. Herein, we propose using -NH2-functionalized COF nanosheets as reactive fillers (rCON) to fabricate MMMs. rCON altered the morphology and chemistry of MMMs by controlling the diffusion rate of piperazine through hydrogen bonding prior to the interfacial polymerization process and inducing the creation of ridges in the MMMs with subsequent increase in surface area (∼24%). rCON was chemically cross-linked to the trimesoyl chloride through amide bonding, subsequently elevating the hydrophilicity (∼35%) and fouling resistance of MMMs. The presence of -NH2 groups elevated the rCON-PA compatibility, ensuring the high rCON loading of 5 wt % in the MMMs without sacrificing salt rejection. Accordingly, the PA-rCON MMMs exhibited a flux of 46.5 L m-2 h-1 bar-1, which is 6.8 times higher than that of the pristine PA membrane, with a high rejection rate of 93.5% for Na2SO4.",

keywords = "covalent organic framework nanosheets, desalination, interfacial polymerization, mixed matrix membranes, reactive fillers",

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Khan, NA, Khan, NA, Khan, NA, Yuan, J, Yuan, J, Wu, H, Wu, H, Wu, H, Huang, T, Huang, T, You, X, You, X, Rahman, AU, Azad, CS, Olson, MA, Olson, MA & Jiang, Z 2020, 'Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination', ACS Applied Materials and Interfaces, vol. 12, no. 24, pp. 27777-27785. https://doi.org/10.1021/acsami.0c06417

TY - JOUR

T1 - Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination

AU - Khan, Niaz Ali

AU - Yuan, Jinqiu

AU - Wu, Hong

AU - Huang, Tong

AU - You, Xinda

AU - Rahman, Ata Ur

AU - Azad, Chandra S.

AU - Olson, Mark A.

AU - Jiang, Zhongyi

PY - 2020/6/17

Y1 - 2020/6/17

N2 - Mixed matrix membranes (MMMs) have been increasingly utilized in membrane processes. Covalent organic frameworks (COFs) hold great promise as emergent nanofillers to fabricate high-performance MMMs; however, only few studies about COF materials in MMMs have been reported where COFs are all used as nonreactive fillers. Herein, we propose using -NH2-functionalized COF nanosheets as reactive fillers (rCON) to fabricate MMMs. rCON altered the morphology and chemistry of MMMs by controlling the diffusion rate of piperazine through hydrogen bonding prior to the interfacial polymerization process and inducing the creation of ridges in the MMMs with subsequent increase in surface area (∼24%). rCON was chemically cross-linked to the trimesoyl chloride through amide bonding, subsequently elevating the hydrophilicity (∼35%) and fouling resistance of MMMs. The presence of -NH2 groups elevated the rCON-PA compatibility, ensuring the high rCON loading of 5 wt % in the MMMs without sacrificing salt rejection. Accordingly, the PA-rCON MMMs exhibited a flux of 46.5 L m-2 h-1 bar-1, which is 6.8 times higher than that of the pristine PA membrane, with a high rejection rate of 93.5% for Na2SO4.

AB - Mixed matrix membranes (MMMs) have been increasingly utilized in membrane processes. Covalent organic frameworks (COFs) hold great promise as emergent nanofillers to fabricate high-performance MMMs; however, only few studies about COF materials in MMMs have been reported where COFs are all used as nonreactive fillers. Herein, we propose using -NH2-functionalized COF nanosheets as reactive fillers (rCON) to fabricate MMMs. rCON altered the morphology and chemistry of MMMs by controlling the diffusion rate of piperazine through hydrogen bonding prior to the interfacial polymerization process and inducing the creation of ridges in the MMMs with subsequent increase in surface area (∼24%). rCON was chemically cross-linked to the trimesoyl chloride through amide bonding, subsequently elevating the hydrophilicity (∼35%) and fouling resistance of MMMs. The presence of -NH2 groups elevated the rCON-PA compatibility, ensuring the high rCON loading of 5 wt % in the MMMs without sacrificing salt rejection. Accordingly, the PA-rCON MMMs exhibited a flux of 46.5 L m-2 h-1 bar-1, which is 6.8 times higher than that of the pristine PA membrane, with a high rejection rate of 93.5% for Na2SO4.

KW - covalent organic framework nanosheets

KW - desalination

KW - interfacial polymerization

KW - mixed matrix membranes

KW - reactive fillers

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JO - ACS Applied Materials and Interfaces

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ER -

Covalent Organic Framework Nanosheets as Reactive Fillers to Fabricate Free-Standing Polyamide Membranes for Efficient Desalination

Abstract

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Keywords

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