Prevention of bacterial adhesion on polyamide reverse osmosis membranes via electrostatic interactions using a cationic phosphorylcholine polymer coating

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• 作者：Daisuke Saeki ; Tatsuya Tanimoto ; Hideto Matsuyama
• 关键词：Reverse osmosis membrane ; Phosphorylcholine polymer ; Anti-biofouling ; Electrostatic interaction
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：20 February, 2014
• 年：2014
• 卷：443
• 期：Complete
• 页码：171-176
• 全文大小：1321 K

文摘

A simple and easy anti-adhesive coating method against bacteria via electrostatic interaction was developed for polyamide reverse osmosis (RO) membranes using a cationic phosphorylcholine polymer. A commercial polyamide RO membrane was immersed into an aqueous solution of phosphorylcholine polymer containing cationic amino groups, poly[2-methacryloyloxyethyl phosphorylcholine (MPC)-co-2-aminoethylmethacrylate (AEMA)] (p(MPC-co-AEMA)). From the results of contact angle and surface potential measurements, the surface of the coated RO membrane became more hydrophilic than that of raw membranes and had a neutral charge. Conversely, the surface of an RO membrane immersed in an aqueous solution of MPC homopolymer without AEMA groups was not coated by the polymer. Therefore, p(MPC-co-AEMA) was adsorbed via electrostatic interaction between the cationic amino groups of AEMA and anionic carboxylic groups on the polyamide RO membrane. X-ray photoelectron spectroscopy showed the existence of phosphorylcholine groups from p(MPC-co-AEMA) on the coated membranes. The result of quartz crystal microbalance with dissipation monitoring measurements showed that adsorbed p(MPC-co-AEMA) was hardly desorbed from the polyamide surface in a high ionic strength solution at least for one day. The coated RO membrane had high resistance to bacterial adhesion and retained its original rejection performance.