Preparation of Polypropylene/PVDF Composite Membrane by Dip-Coating Method

• Published in: IOP conference series. Materials Science and Engineering Vol. 1115; no. 1; p. 12028
• Main Authors: Aryanti, P T P, Trilaksono, G, Hotmaida, A, Afifah, M A, Pratiwi, F P, Udini, N, Nugroho, F A
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.03.2021
• Subjects: Acetone; Contact angle; Dip coatings; Filtration; Flux; Hexanes; Hollow fiber membranes; Immersion coating; Polypropylene; Polyvinylidene fluorides; Porosity; Rejection; Solvents; Swelling; Tetrahydrofuran
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/1115/1/012028

Abstract In this research, a composite membrane was prepared by dipping a hollow fiber polypropylene (PP) membrane in a polyvinylidene fluoride (PVDF) solution. A small concentration of volatile solvent (acetone and tetrahydrofuran/THF) was added to the PVDF solution to form a tight structure in the membrane surface. The influence of PVDF concentration, type of volatile solvents (acetone and THF), and the dip-coating cycle on membrane characteristics, including porosity, swelling degree, and contact angle, were investigated. The flux and rejection of the membranes were also investigated during the filtration of hexane/oil solution. The experimental results showed that low membrane porosity (3%), low swelling degree (0.1%), and high water contact angle (140°) were obtained when 8%wt PVDF was blended with 10%wt acetone and then coated on PP hollow fiber membrane surface with 3 (three) dip-coating cycles. The oil rejection was 68% after 45 minutes of filtration time with a permeate flux of 20 L.m −2 .h −1 . Higher membrane porosity and permeate flux can be obtained by reducing the dip-coating cycle; however, a lower oil rejection was achieved.