Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments

doi:10.1016/S1004-9541(13)60507-8

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (5): 473-484.DOI: 10.1016/S1004-9541(13)60507-8

Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments

魏新渝^1,2,3, 王志^1,2,3, 许骏^1,2,3, 王纪孝^1,2,3, 王世昌^1,3

1 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China;
4 Nuclear and Radiation Safety Centre, Ministry of Environmental Protection of the People's Republic of China, Beijing 100082, China

收稿日期:2012-10-24 修回日期:2012-12-17 出版日期:2013-05-28 发布日期:2013-05-31
通讯作者: WANG Zhi
基金资助:
Supported by the National Natural Science Foundation of China (20676095) and the Program of Introducing Talents of Discipline to Universities (B06006).

Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments

WEI Xinyu^1,2,3, WANG Zhi^1,2,3, XU Jun^1,2,3, WANG Jixiao^1,2,3, WANG Shichang^1,3

1 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China;
4 Nuclear and Radiation Safety Centre, Ministry of Environmental Protection of the People's Republic of China, Beijing 100082, China

Received:2012-10-24 Revised:2012-12-17 Online:2013-05-28 Published:2013-05-31
Supported by:
Supported by the National Natural Science Foundation of China (20676095) and the Program of Introducing Talents of Discipline to Universities (B06006).

摘要/Abstract

摘要： Crosslinking treatments for a commercially available aromatic polyamide reverse osmosis membrane were carried out to improve its chlorine resistance. The crosslinking agents including 1,6-hexanediol diglycidyl ether, adipoyl dichloride and hexamethylene diisocyanate ester with long flexible aliphatic chains and high reactivity with N-H groups were used in the experiments. Attenuated total reflective Fourier transform infrared spectra verified the successful preparation of highly crosslinked membranes by crosslinking treatments. It was suggested that the crosslinking agents were connected to membrane surface through the reactions with amine and amide II groups, which is confirmed by surface charge measurements. Based on contact angle measurements, crosslinking treatments decreased membrane hydrophilicity by introducing methylene groups to membrane surface. With increasing amount of crosslinking agent molecules connected to membrane surface, the hydrolysis of unconnected functional groups of crosslinking agent produced polar groups and increased membrane hydrophilicity. The highly crosslinked membranes showed higher salt rejections and lower water fluxes as compared with the raw membrane. Since the active sites (N-H groups) vulnerable to free chlorine on membrane surface were eliminated by crosslinking treatments, the chlorine resistances of the highly crosslinked membranes were significantly improved by slighter changes in both water fluxes and salt rejections after chlorination.

关键词: aromatic polyamide membrane, 1,6-hexanediol diglycidyl ether, adipoyl dichloride, hexamethylene diisocyanate ester, crosslinking, chlorine resistance

Abstract: Crosslinking treatments for a commercially available aromatic polyamide reverse osmosis membrane were carried out to improve its chlorine resistance. The crosslinking agents including 1,6-hexanediol diglycidyl ether, adipoyl dichloride and hexamethylene diisocyanate ester with long flexible aliphatic chains and high reactivity with N-H groups were used in the experiments. Attenuated total reflective Fourier transform infrared spectra verified the successful preparation of highly crosslinked membranes by crosslinking treatments. It was suggested that the crosslinking agents were connected to membrane surface through the reactions with amine and amide II groups, which is confirmed by surface charge measurements. Based on contact angle measurements, crosslinking treatments decreased membrane hydrophilicity by introducing methylene groups to membrane surface. With increasing amount of crosslinking agent molecules connected to membrane surface, the hydrolysis of unconnected functional groups of crosslinking agent produced polar groups and increased membrane hydrophilicity. The highly crosslinked membranes showed higher salt rejections and lower water fluxes as compared with the raw membrane. Since the active sites (N-H groups) vulnerable to free chlorine on membrane surface were eliminated by crosslinking treatments, the chlorine resistances of the highly crosslinked membranes were significantly improved by slighter changes in both water fluxes and salt rejections after chlorination.

Key words: aromatic polyamide membrane, 1,6-hexanediol diglycidyl ether, adipoyl dichloride, hexamethylene diisocyanate ester, crosslinking, chlorine resistance

魏新渝, 王志, 许骏, 王纪孝, 王世昌. Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments[J]. Chinese Journal of Chemical Engineering, 2013, 21(5): 473-484.

WEI Xinyu, WANG Zhi, XU Jun, WANG Jixiao, WANG Shichang. Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments[J]. Chin.J.Chem.Eng., 2013, 21(5): 473-484.

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Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments

Surface Modification of Commercial Aromatic Polyamide Reverse Osmosis Membranes by Crosslinking Treatments

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