Investigation of Electrochemical and Morphological Properties of Mixed Matrix Polysulfone-Silica Anion Exchange Membrane

Abstract

Abstract. Mixed matrix anion exchange membranes (AEMs) were synthesized using dry-wet phase inversion. The casting solutions were prepared by dispersing finely ground anion-exchange resin particles in N,N-dimethylacetamide (DMAc) solutions of polysulfone (PSf). Subsequently, nanosilica particles were introduced into the membranes. The results show that evaporation time (t ev ) and solution composition contributed to membrane properties formation. A longer t ev produces membranes with reduced void fraction inside the membranes, thus the amount of water adsorbed and membrane conductivity are reduced. Meanwhile, the permselectivity was improved by increasing t ev , since a longer t ev produces membranes with a narrower channel for ion migration and more effective Donnan exclusion. The incorporation of 0.5 %-wt nanosilica particles into the polymer matrix led to conductivity improvement (from 2.27 to 3.41 mS.cm -1 ). This may be associated with additional pathway formation by hydroxyl groups on the silica surface that entraps water and assists ion migration. However, at further silica loading (1.0 and 1.5 %-wt), these properties decreased (to 1.9 and 1.4 mS.cm -1 respectively), which attributed to inaccessibility of ion-exchange functional groups due to membrane compactness. It was found from the results that nanosilica contributes to membrane formation (increases casting solution viscosity then reduces void fraction) and membrane functional group addition (provides hydroxyl groups).

Recent advances in waste lube oils processing technologies

“…Membrane-based processes have been widely used in various fields, such as water treatments [79][80][81][82][83][84][85][86][87], wastewater treatment [88,89], gas separation [90,91], energy conversion [92], medical and chemical processing [93][94][95][96][97], food processing and biotechnology [98][99][100][101][102], and so on, competing with conventional processes [81][82][83][103][104][105][106][107]. The rapid growth in development and application of membrane technologies is due to their interesting features.…”

Fabrication, Characterisation and Electrochemical Properties of Heterogeneous Multiwalled Carbon Nanotubes Cation Exchange Membranes (MWCNT-CEMs)

“…The O-H that is originated from the polymeric matrix membrane can help to entrap water and build pathways for ion diffusion. 7 Additional peaks were formed at 3429 and 1679 cm −1 after SCER and MWCNT were blended into the PVC matrix. This result shows that sulfonic acid group from SCER and MWCNT were successfully incorporated into the polymeric PVC matrix.…”

Electrochemical Properties of Chemically Treated Polyvinylchloride‐Based Heterogeneous Cation‐Exchange Membrane

“…In additive blending, an additive which is electrically conductive and hydrophilic and has functional sites is introduced into membrane solution. Nanosized silica, carbon nanotube, zeolite, and metal oxide nanoparticles are the typical example of the additive . Compatibility between particle and membrane matrix, functional site blockage, and cracks are the main issues in particle blending.…”