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

Autor: Khan NA; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.; Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Pakistan., Yuan J; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China., Wu H; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China., Huang T; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China., You X; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China., Rahman AU; Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Pakistan., Azad CS; School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China., Olson MA; School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.; Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States., Jiang Z; Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Jun 17; Vol. 12 (24), pp. 27777-27785. Date of Electronic Publication: 2020 Jun 03.
DOI: 10.1021/acsami.0c06417
Abstrakt: 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 -NH 2 -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 -NH 2 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 Na 2 SO 4 .
Databáze: MEDLINE
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