Preparation of mesh-reinforced cellulose acetate forward osmosis membrane with very low surface roughness

Seyyed Mostafa Mirkhalili; Seyyed Abbas Mousavi; Ahmad Ramazani Saadat Abadi; Masoud Sadeghi

Korean Journal of Chemical Engineering, Vol.34, No.12, 3170-3177, December, 2017

DOI10.1007/s11814-017-0206-y Export Citation

Preparation of mesh-reinforced cellulose acetate forward osmosis membrane with very low surface roughness

Seyyed Mostafa Mirkhalili, Seyyed Abbas Mousavi^†, Ahmad Ramazani Saadat Abadi, and Masoud Sadeghi

Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran

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Mesh-reinforced cellulose acetate (CA)-based membranes were prepared for forward osmosis (FO) by immersion precipitation. Casting compositions such as CA percent and 1, 4-dioxane/acetone ratio and also preparation conditions such as evaporation time, coagulation bath and annealing temperatures were tested for membranes’ performance. The results were compared with commercially CTA membranes. The best membrane (17.9% polymer and 1, 4-dioxane/acetone ratio of 1.89) showed water flux of 9.3 L/m2h (LMH) and RSF of 0.536mol NaCl/m2h. Moreover, the membrane structure was reinforced by a polyester mesh, which created micro pores in the back of the membrane. This caused higher water flux and RSF compared to membranes without mesh. FO membrane prepared under best conditions, had a smoother surface than commercial ones. This feature enhances the fouling properties of the membrane, which can be appropriate for wastewater treatment applications.

Keywords:Forward Osmosis;Cellulosic Membrane;Internal Concentration Polarization;Mesh-reinforced Membrane

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