Effect of Evaporation Time on Separation Performance of Polysulfone/Cellulose Acetate (PSF/CA) Membrane

Abstract

Polysulfone and cellulose acetate are common material in separation. In this research, polysulfone/cellulose actetate (PSF/CA) blend membrane was prepared. The aim of this research was to study effect of evaporation time in casting of PSF/CA membrane and its performance in filtration. CA was obtained by acetylation process of bacterial cellulose (BC) from fermentation of coconut water. Fourier Transform Infra Red (FTIR) Spectroscopy was used to examine functional groups of BC, CA and commercial cellulose acetate. Subtitution of acetyl groups determined by titration method. Blend membranes were prepared through phase inversion technique in which composition of PSF/PEG/CA/NMP(%w) was 15/5/5/75. Polyethyleneglycol (PEG) and N-methyl-2-pyrrolidone (NMP) were act as pore forming agent and solvent, respectively. Variation of evaporation times were used as parameter to examine water uptake, flux, and morphology of PSF/CA blend membranes. FTIR spectra of CA show characteristic peak of acetyl group at 1220 cm−1 indicated that BC was acetylated succesfully. Degree of subtitution of BCA was found at 2.62. Highest water flux was performed at 2 bar obtained at 106.31 L.m-2.h-1 at 0 minute variation, and decrease as increasing evaporation time. Morphology of PSF/BCA blend membranes were investigated by Scanning Electron Microscopy (SEM) showed that porous asymetric membrane were formed.

Effect of Solvent Evaporation Time of Polysulfone Incorporated Copper Oxide Nanoparticles Incorporated Polysulfone Ultrafiltration Membrane on Protein Removal

“…This observation tallies with findings that mentioned the shrinkages of the pores are can be explained by the kinetic aspect of the formation of membrane by phase inversion technique. In case of a fast demixing process with little evaporation time, membrane pores that were formed immediately induced a porous, wide finger-like structures [16]. Image from SEM proved that, finger-like structure at top layer of membrane become narrower as evaporation time increase.…”

“…This corresponded to the morphology trend of the polymeric membranes. As the evaporation time increased, the thin, dense layer at the top of the membrane becomes thicker and denser, making the layer less porous and causing difficulty for water to permeate through which, in turn, reduced the water flux [16]. The evaporation step in the membrane preparation procedure create high retentive membrane which lead to formation of dense membrane and slow down the flux performance.…”

Peningkatan Kinerja Membran Polietersulfon (PES) dengan Modifikasi Menggunakan Aditif Hidrofilik

“…Modifikasi membran polymer blending dilakukan dengan penambahan aditif sebagai pembentuk pori untuk meningkatkan kinerja dan hidrofilisitas membran. Aditif yang biasa digunakan sebagai modifikasi membran adalah polyvinyl pyrrolidone [6], polyurethane [7], tetronic 1307, dan cellulose acetate [8].…”