Structure and Properties of Graphene Oxide－Chitosan Composite Membrane Prepared by the Plasma Acid Solvent

In order to obtain a green solvent for chitosan, plasma acid was prepared by dielectric barrier discharge of water. The results showed that the maximum saturated solubility of chitosan in the plasma acid at pH of 1.25 was 1%. Then 1% chitosan membrane, 0.5% graphene oxide (GO) and 1% chitosan composite membrane were prepared using plasma acid as solvent. The structure and properties of GO/chitosan composite membrane were investigated carefully by thermal-gravimetric, scanning electron microscope,X-ray diffraction, Fourier transform infrared spectroscopy and mechanical property analysis. After adding GO into the chitosan solution, the GO was dispersed uniformly in the matrix. There was a strong interaction between GO and chitosan matrix, which prevented the aggregation of graphene effectively. The surface of the composite membrane became smooth. The thermal stability of GO/chitosan composite membrane was increased. It had good mechanical properties. In a word, plasma acid could be used as a green solvent, the performance of chitosan membrane was improved after adding GO. It has the potential application in the field of biomedicine and textiles.