Article
Article
| Content Provider | MDPI |
|---|---|
| Author | García-Cruz, Leticia Casado-Coterillo, Clara Irabien, Ángel Montiel, Vicente Iniesta, Jesus |
| Abstract | Mixed matrix membranes (MMM) based on chitosan (CS) and poly (vinyl) alcohol (PVA) with a 50:50 w/w ratio doped with graphene oxide (GO) are prepared by solution casting and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), water uptake, alcohol permeability, ion exchange capacity (IEC) and OH− conductivity measurements. The SEM analysis revealed a dense MMM where the GO nanosheets were well dispersed over the entire polymer matrix. The incorporation of GO increased considerably the thermal stability of the CS:PVA membrane. The GO-based MMM exhibited a low conductivity of 0.19 mS·cm−1 in part because the GO sheets did not change the crystallinity of the CS:PVA matrix. The reinforced structure created by the hydrogen bonds between the GO filler and the CS:PVA matrix resulted to be a good physical barrier for alcohol permeability, achieving a coefficient of diffusion of 3.38 × 10−7 and 2.43 × 10−7 cm2·s−1 after 60 and 120 min, respectively, thus avoiding additional alcohol crossover. Finally, the electrochemical performance of the GO-based MMM in the electrooxidation of propargyl alcohol was investigated in a Polymer Electrolyte Membrane Electrochemical Reactor (PEMER) under alkaline conditions, through the polarization curve and the electrolysis reactions, showing a performance comparable to anion-exchange commercial membranes. |
| File Size | 2854912 |
| File Format | |
| e-ISSN | 23115629 |
| DOI | 10.3390/c2020010 |
| Journal | C |
| Issue Number | 2 |
| Volume Number | 2 |
| Language | English |
| Publisher Date | 2016-04-01 |
| Access Restriction | Open |
| Subject Keyword | graphene oxide graphene composite electrolyte membrane chitosan poly (vinyl) alcohol alkaline anion-exchange membrane (AAEM) alcohol permeability |
| Content Type | Text |
| Resource Type | Article |
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