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    The effect of Schiff base network on the separation performance of thin film nanocomposite forward osmosis membranes

    Year: 2019

    Journal: Sep. Purif. Technol., Volume 217, JUN 15, page 284–293

    Authors: Akther, Nawshad; Lim, Sungil; Van Huy Tran; Phuntsho, Sherub; Yang, Yanqin; Tae-Hyun Bae; Ghaffour, Noreddine; Shon, Ho Kyong

    Organizations: King Abdullah University of Science and Technology (KAUST), Saudi Arabia, through the Competitive Research Grant Program [CRG2017 (CRG6), URF/1/3404-01]

    Keywords: Forward osmosis (FO); Interfacial polymerization (IP); Covalent organic frameworks (COFs); Schiff base network-1 (SNW-1); Thin-film nanocomposite (TFN) membrane

    In this study, Schiff base network-1 (SNW-1) nanoparticles, which are covalent organic frameworks (COFs), were used as fillers in the polyamide (PA) active layer to elevate the performance of thin-film nanocomposite (TFN) forward osmosis (FO) membranes. The TFN membranes were prepared by interfacial polymerization (IP) of m-phenylenediamine (MPD) and trimesoyl chloride (TMC), and the SNW-1 nanoparticles were dispersed in the MPD aqueous solution at various concentrations. The secondary amine groups of SNW-1 nanoparticles reacted with the acyl chloride groups of TMC during the IP reaction to form strong covalent/amide bonds, which facilitated better interface integration of SNW-1 nanoparticles in the PA layer. Additionally, the incorporation of amine-rich SNW-1 nanoparticles into the TFN membranes improved their surface hydrophilicity, and the porous structure of SNW-1 nanoparticles offered additional channels for transport of water molecules. The TFN0.005 membrane with a SNW-1 nanoparticle loading of 0.005 wt% demonstrated a higher water flux than that of pristine TFC membrane in both AL-FS (12.0 vs. 9.3 L m(-2) h(-1)) and AL-DS (25.2 vs. 19.4 L m(-2) h(-1)) orientations when they were tested with deionized water and 0.5 M NaCl as feed and draw solution, respectively.
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