Preparation and Properties of Go / Pva Composite Hydrogel

Abstract

In this study, high mechanical strength hydrogels composed of polyvinyl alcohol (PVA), polyvinyl oxide (PEO) and nano-graphene oxide (GO) were prepared by a simple one-pot method. The hydrogel not only has excellent mechanical properties, but also has strong adsorption properties for methylene blue (MB) in dye wastewater. The composition and structure of the composite hydrogels were characterized by SEM, FTIR, XRD and XPS. Tensile and compression tests show that the maximum tensile strength of the composite hydrogel is 2 MPa, the maximum tensile displacement is 480% of the initial form, and the maximum compressive strength can reach 13 MPa. The effects of temperature, pH and concentration of adsorbent on the adsorption properties were studied. The optimum adsorption temperature was 35°C, the optimum adsorption pH was 8.0, and the optimum adsorbent concentration was 5%. At the same time, adsorption kinetics and adsorption isotherm model were used to fit the adsorption process of composite hydrogel. This study shows that PPG three-dimensional network structure composite hydrogel can be used as an environmentally friendly, low-cost and efficient adsorbent for the removal of dye-containing industrial wastewater in textile industry, and has broad industrial application prospects.

Keywords: Hydrogel, Polyvinyl alcohol, graphene oxide, High mechanical properties, adsorb