Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine

The forward osmosis (FO) membrane exhibits great performance degradation when contacting with chlorine solutions. The damage of chlorine to membrane material will seriously reduce the lifetime of the membrane and increase the cost of membrane treatment technology. Here, we prepared chlorine-stable m...

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Autores principales:	Yinghua Li, Wenhe Deng, Haibo Li, Fei Su, Xin Huang, Fan Mo, Ran Zhang, Xiaoyu Ren
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	chlorine resistance cyclohexylamine forward osmosis polymerization thin film composite membrane Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/7a5a9b27f9b247c6bddf2143822197d6
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spelling	oai:doaj.org-article:7a5a9b27f9b247c6bddf2143822197d62021-11-23T18:55:51ZToward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine1606-97491607-079810.2166/ws.2021.107https://doaj.org/article/7a5a9b27f9b247c6bddf2143822197d62021-11-01T00:00:00Zhttp://ws.iwaponline.com/content/21/7/3449https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The forward osmosis (FO) membrane exhibits great performance degradation when contacting with chlorine solutions. The damage of chlorine to membrane material will seriously reduce the lifetime of the membrane and increase the cost of membrane treatment technology. Here, we prepared chlorine-stable membranes by a covalent modification method with cyclohexylamine. The cyclohexylamine observably changed the surface morphology, the roughness (arithmetic average) of the membrane decreased from 22 to 17.2 nm. The addition of cyclohexylamine produced a denser sacrificial layer of short chain polyamide, which made modified membranes possess significantly better chlorine resistance with slightly declined water flux. The water flux of the optimal modified membrane was 10.78 Lm−2 h−1, only 13% less than that of the pristine membrane. Importantly, after 20,000 ppm·h chlorine exposure, the membrane with 1.5 wt% cyclohexylamine had a salt rejection of 77.2% and showed 26.0% lower water flux than pristine TFC (thin film composite) membrane in FO mode. Notably, the grafting membranes could maintain a high performance under acidic chlorination conditions. The membrane with best performance had a salt rejection of 81.6%, exhibiting 24.4% higher salt rejection than pristine membrane with 20,000 ppm·h chlorine exposure at a pH of 4. The cyclohexylamine endowed the FO membrane with better chlorine resistance, making it attractive for the development of chlorine-resistant membrane for environmental and desalination processes. HIGHLIGHTS The addition of cyclohexylamine produced a chlorine-resistant sacrificial layer.; The 1.0 wt% addition of cyclohexylamine did not significantly decrease the water flux of the forward osmosis membrane.; Under acidic conditions, cyclohexylamine could still significantly improve the chlorine resistance of forward osmosis membranes.;Yinghua LiWenhe DengHaibo LiFei SuXin HuangFan MoRan ZhangXiaoyu RenIWA Publishingarticlechlorine resistancecyclohexylamineforward osmosispolymerizationthin film composite membraneWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 7, Pp 3449-3458 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chlorine resistance cyclohexylamine forward osmosis polymerization thin film composite membrane Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	chlorine resistance cyclohexylamine forward osmosis polymerization thin film composite membrane Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Yinghua Li Wenhe Deng Haibo Li Fei Su Xin Huang Fan Mo Ran Zhang Xiaoyu Ren Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
description	The forward osmosis (FO) membrane exhibits great performance degradation when contacting with chlorine solutions. The damage of chlorine to membrane material will seriously reduce the lifetime of the membrane and increase the cost of membrane treatment technology. Here, we prepared chlorine-stable membranes by a covalent modification method with cyclohexylamine. The cyclohexylamine observably changed the surface morphology, the roughness (arithmetic average) of the membrane decreased from 22 to 17.2 nm. The addition of cyclohexylamine produced a denser sacrificial layer of short chain polyamide, which made modified membranes possess significantly better chlorine resistance with slightly declined water flux. The water flux of the optimal modified membrane was 10.78 Lm−2 h−1, only 13% less than that of the pristine membrane. Importantly, after 20,000 ppm·h chlorine exposure, the membrane with 1.5 wt% cyclohexylamine had a salt rejection of 77.2% and showed 26.0% lower water flux than pristine TFC (thin film composite) membrane in FO mode. Notably, the grafting membranes could maintain a high performance under acidic chlorination conditions. The membrane with best performance had a salt rejection of 81.6%, exhibiting 24.4% higher salt rejection than pristine membrane with 20,000 ppm·h chlorine exposure at a pH of 4. The cyclohexylamine endowed the FO membrane with better chlorine resistance, making it attractive for the development of chlorine-resistant membrane for environmental and desalination processes. HIGHLIGHTS The addition of cyclohexylamine produced a chlorine-resistant sacrificial layer.; The 1.0 wt% addition of cyclohexylamine did not significantly decrease the water flux of the forward osmosis membrane.; Under acidic conditions, cyclohexylamine could still significantly improve the chlorine resistance of forward osmosis membranes.;
format	article
author	Yinghua Li Wenhe Deng Haibo Li Fei Su Xin Huang Fan Mo Ran Zhang Xiaoyu Ren
author_facet	Yinghua Li Wenhe Deng Haibo Li Fei Su Xin Huang Fan Mo Ran Zhang Xiaoyu Ren
author_sort	Yinghua Li
title	Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
title_short	Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
title_full	Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
title_fullStr	Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
title_full_unstemmed	Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
title_sort	toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/7a5a9b27f9b247c6bddf2143822197d6
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Toward enhancing the chlorine resistance of forward osmosis membranes: an effective strategy via grafting cyclohexylamine

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