Effect of VIPS fabrication parameters on the removal of acetic acid by supported liquid membrane using a PES–graphene membrane support

Abstract

In this study, the removal of acetic acid by supported liquid membrane (SLM) using hybrid polyethersulfone (PES)-graphene membrane prepared by vapor induced phase separation (VIPS) was investigated. The effects of graphene loading, coagulation bath temperature, air exposure time, and air humidity on the morphology, mechanical strength, porosity, and contact angle of the membrane were analyzed. The performance and stability of the hybrid membrane as a SLM support for acetic acid removal were studied. The best PES-graphene membrane support was produced at a coagulation bath temperature of 50 C, an air exposure time of 30 s and air humidity of 80%. The fabricated membrane has a symmetrical micropore cellular structure, high porosity and high contact angle. Under specific SLM conditions, almost 95% of acetic acid was successfully removed from 10 g L À1 aqueous acetic acid solution. The hybrid membrane remains stable for more than 116 h without suffering any membrane breakage during the continuous SLM process.

Characteristics and Performances of Blended Polyethersulfone and Carbon‐Based Nanomaterial Membranes: Effect of Nanomaterial Types and Air Exposure

“…This might be due to more CNT agglomerates formed in the polymeric membrane compared to GNPs as reported by Yue et al . The agglomeration might hinder the reactivity of CNTs and ability to improve the membrane hydrophobicity .…”

“…However, the water contact angle of the PES/GNP‐P membrane without air exposure is slightly larger compared to the pure PES membrane, i.e., 77.35° to 76.14°, respectively. The incorporated GNPs at low loading of 0.3 % resulted in higher membrane surface roughness but produced well‐distributed GNPs particles . Therefore, although the increase of surface roughness would reduce the contact angle, the PES/GNPs‐P membrane still has a larger contact angle than the PES membrane due to the well‐distributed GNPs in the membrane which are naturally hydrophobic.…”

Study on stripping phase conditions on the levulinic acid extraction using supported liquid membrane

“…It shows a long cylindrical microvoid structure that connected from the top to the bottom surface of the membrane. This same type of the membrane was successfully used for extraction of acetic acid using SLM process previously [9].…”

“…The separation or recovery of organic acids like LA from other biomass byproducts is the most challenging and costly part in biorefinery [2][3][4][5][6]. Recently, supported liquid membrane (SLM) has gained significant attention in downstream process due to its high degree of selectivity and capacity during separating or recovering the desired component from the mixture [7][8][9]. Moreover, optimization study on the operation parameters of the SLM system can further improve the efficiency of the process.…”

“…During this step, the extracted component via carrier in the organic liquid membrane phase will be released to the stripping phase by the stripping agent. The carrier is regenerated and restarts the extraction cycle [8,9]. This process occurs simultaneously in the SLM and prevents the accumulation of extracted components in the liquid membrane phase, hence, improving the permeation and flux [10].…”