Modifying the surface of active polyamide layer in thin-film composite tubular membranes with polyethylene glycol for improved separation and antifouling

Document Type

Article

Source Title

Journal of the Taiwan Institute of Chemical Engineers

Volume

131

Publication Date

2022

Abstract

Background: Membrane fouling can deteriorate the membrane performance for the long term. Surface modification of the membrane using hydrophilic moieties improves the antifouling property of the membrane. In this study, a thin-film composite (TFC) polyamide tubular membrane was modified using glutaraldehyde (GA) and polyethylene glycol (PEG). Methods: A Polyamide layer was formed through interfacial polymerization of piperazine (PIP) with trimesoyl chloride (TMC). Before modification using PEG on the surface of the TFC membrane, the TFC membrane was post-treated using GA. The aldehyde group of the GA reacted with free amines on the polyamide surface, producing an enamine. PEG modified the GA-TFC membrane through the reaction of the excess aldehyde group of the GA on the membrane surface. Findings: PEG-GA-TFC membrane shows a better hydrophilicity and membrane surface charge than pristine and GA-TFC membrane. Consequently, during the nanofiltration test, it delivered the highest membrane performance and antifouling property (tested using 100 ppm BSA solution). Furthermore, the modified membrane exhibited good stability in a wide range of pressure and salt concentration.

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Disciplines

Chemical Engineering

Keywords

Polyamides—Surfaces; Thin films; Membranes (Technology); Nanofiltration; Polyethylene glycol

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