Modulation of Viscoelastic and Absorption Properties of Poly(vinyl alcohol)-graphene Oxide Composites AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c00872

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PVA (poly(vinyl alcohol))/GO (graphene oxide) composites were prepared by mixing the PVA aqueous solution and GO aqueous dispersion through the freezing–thawing method. The morphology and chemical structure of GO and composites were investigated by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Viscoelastic and swelling properties and absorption capacities of cationic dye methylene blue (MB) were studied as a function of initial concentration of PVA and GO and the number of freezing–thawing cycles. The highest improvement in linear viscoelastic properties of PVA/GO composites was observed with the increase of GO concentration. Experimental data of the kinetic study of MB absorption were well fitted by the pseudo-first-order kinetic model and it was clearly shown that the greatest enhancement of MB absorption was also achieved by increasing the GO concentration. A correlation between swelling, absorption, and viscoelastic and structural properties of PVA/GO composites was proposed.