Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination

doi:10.1007/s40242-021-1270-8

高等学校化学研究 ›› 2021, Vol. 37 ›› Issue (5): 1101-1109.doi: 10.1007/s40242-021-1270-8

Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination

BIAN Xiangying¹, ZHANG Yuping¹, GONG Li², ZHU Yuzhang¹, JIN Jian^1,2

1. i-Lab and CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China;
2. College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China

收稿日期:2021-07-15 修回日期:2021-08-26 出版日期:2021-10-01 发布日期:2021-09-30
通讯作者: ZHU Yuzhang, JIN Jian E-mail:yzzhu2011@sinano.ac.cn;jjin2009@sinano.ac.cn
基金资助:
This work was supported by the National Natural Science Foundation of China(Nos.21988102, 51873230), the National Natural Science Funds for Distinguished Young Scholars, China(No.51625306) and the Found of the Youth Innovation Promotion Association CAS(No.2021318).

Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination

BIAN Xiangying¹, ZHANG Yuping¹, GONG Li², ZHU Yuzhang¹, JIN Jian^1,2

1. i-Lab and CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China;
2. College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China

Received:2021-07-15 Revised:2021-08-26 Online:2021-10-01 Published:2021-09-30
Contact: ZHU Yuzhang, JIN Jian E-mail:yzzhu2011@sinano.ac.cn;jjin2009@sinano.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China(Nos.21988102, 51873230), the National Natural Science Funds for Distinguished Young Scholars, China(No.51625306) and the Found of the Youth Innovation Promotion Association CAS(No.2021318).

摘要/Abstract

摘要： Improving the permeate flux but retaining the rejection of thin-film composite(TFC) polyamide nanofiltration(NF) membrane is a high requirement for desalination. In this work, a calcium ion(Ca²⁺) coordinated polyamide(PA) NF membrane was prepared by directly adding CaCl₂ to the piperazine(PIP) aqueous solution during the interfacial polymerization process. Due to the coordination interaction between Ca²⁺ and the amide bond in PA active layer, the number of hydrogen bonds in the PA active layer was reduced, causing in turn the decrease of physical cross-linking degree. As a consequence, the pore of the PA active layer was enlarged, prominently enhancing the water permeance of NF membrane. With the increase of CaCl₂ concentration, the pure water flux of TFC NF increased significantly while the rejection of Na₂SO₄ decreased sightly. Compared with TFC NF membrane prepared without CaCl₂, the permeate flux of the Ca²⁺ coordinated polyamide NF membrane prepared under optimal conditions was increased by 3-4 folds with Na₂SO₄ rejection of 95.26%. Meanwhile, such a Ca²⁺ coordinated PA NF membrane showed a better SO₄^2-/Cl^- selectivity.

关键词: Nanofiltration membrane, Calcium chloride, Interfacial polymerization, Ion selectivity

Abstract: Improving the permeate flux but retaining the rejection of thin-film composite(TFC) polyamide nanofiltration(NF) membrane is a high requirement for desalination. In this work, a calcium ion(Ca²⁺) coordinated polyamide(PA) NF membrane was prepared by directly adding CaCl₂ to the piperazine(PIP) aqueous solution during the interfacial polymerization process. Due to the coordination interaction between Ca²⁺ and the amide bond in PA active layer, the number of hydrogen bonds in the PA active layer was reduced, causing in turn the decrease of physical cross-linking degree. As a consequence, the pore of the PA active layer was enlarged, prominently enhancing the water permeance of NF membrane. With the increase of CaCl₂ concentration, the pure water flux of TFC NF increased significantly while the rejection of Na₂SO₄ decreased sightly. Compared with TFC NF membrane prepared without CaCl₂, the permeate flux of the Ca²⁺ coordinated polyamide NF membrane prepared under optimal conditions was increased by 3-4 folds with Na₂SO₄ rejection of 95.26%. Meanwhile, such a Ca²⁺ coordinated PA NF membrane showed a better SO₄^2-/Cl^- selectivity.

Key words: Nanofiltration membrane, Calcium chloride, Interfacial polymerization, Ion selectivity

BIAN Xiangying, ZHANG Yuping, GONG Li, ZHU Yuzhang, JIN Jian. Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination[J]. 高等学校化学研究, 2021, 37(5): 1101-1109.

BIAN Xiangying, ZHANG Yuping, GONG Li, ZHU Yuzhang, JIN Jian. Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination[J]. Chemical Research in Chinese Universities, 2021, 37(5): 1101-1109.

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Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination

Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination

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