Cationic Surfactant-Modified Covalent Organic Frameworks for Nitrate Removal from Aqueous Solution: Synthesis by Free-Radical Polymerization

Shi-Lei Ji; Hai-Long Qian; Cheng-Xiong Yang; Xu Zhao; Xiu-Ping Yan

doi:10.1002/cplu.202000104

Cationic Surfactant-Modified Covalent Organic Frameworks for Nitrate Removal from Aqueous Solution: Synthesis by Free-Radical Polymerization

Chempluschem. 2020 May;85(5):828-831. doi: 10.1002/cplu.202000104.

Authors

Shi-Lei Ji¹, Hai-Long Qian^{2

3}, Cheng-Xiong Yang¹, Xu Zhao^{2

3}, Xiu-Ping Yan^{2

3}

Affiliations

¹ College of Chemistry Research Center for Analytical Sciences Tianjin Key Laboratory of Molecular Recognition and Biosensing State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, P. R. China.
² State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, P. R. China.
³ Institute of Analytical Food Safety School of Food Science and Technology, Jiangnan University, Wuxi, 214122, P. R. China.

PMID: 32364333
DOI: 10.1002/cplu.202000104

Abstract

Development of efficient adsorbents for nitrate removal is vital for tackling increasing nitrate contamination. We report a free-radical polymerization strategy to prepare a cationic surfactant-modified covalent organic framework (DhaTab-S) for removing nitrate ions from aqueous solution. DhaTab-S was prepared by grafting a cationic surfactant diallyldimethylammonium chloride solution on vinyl-containing COF (DhaTab-V). The adsorption capacity for nitrate was pH-dependent with the maximum at pH 6, and the adsorption process was largely influenced by ionic strength. The adsorption equilibrium for nitrate on DhaTab-S was reached within 40 minutes and followed pseudo-second-order kinetics. DhaTab-S showed a nitrate adsorption capacity of 108.8 mg g^-1 , which is about 15 times that of COF before surfactant modification. The large adsorption capacity makes DhaTab-S a promising candidate for nitrate removal from aqueous media.

Keywords: adsorption; anion removal; covalent organic frameworks; free radical polymerization; surfactants.

Publication types

Research Support, Non-U.S. Gov't