Glow Discharge Electrolysis Plasma And Its Application

Glow discharge electrolysis (GDE) is a kind of non-equilibrium plasma with non-Faradic characteristics. The conventional electrolysis turned into glow discharge electrolysis when the applied voltage was high enough in aqueous media. There are a lot of energetic species to produce during the glow discharge electrolysis process, such as H, OH, H2O2, e-aq, HO2and so on. A series of physical and chemical processes occur when these energetic species contact with the materials’surface and transfer the energies to the molecules and atoms and resulting a ragged surface by etching, a dense cross-linked layer, or oxygenated polarity groups introduced on the surface. So some of the characteristics of the surface, such as the hydrophilic and biocompatibility improve apparently. In addition, these energetic species can initiate polymerization of various monomers.The thesis consists of four parts. The application of glow discharge electrolysis plasma in surface modification, synthesis of poly-acrylics and the absorbency of the obtained reins for the organic pollutant were investigated. First:A reviewThe general definition, the methods for producing of plasma and the characteristics of glow discharge electrolysis plasma were reviewed in brief. In addition, the applications of glow discharge electrolysis plasma in initiation polymerization, surface modification, wastewater treatment, organic synthesis were also introduced in this part.Second:Fabrication of superhydrophobic iron-surface by using glow discharge electrolysis plasmaAn advanced oxidation technology, glow discharge electrolysis plasma, has been successfully used in the fabrication of superhydrophobic iron-surfaces, that is, stearic acid was grafted onto the iron-substrate. To optimize the fabrication conditions, seven important parameters are examined in detail, such as the discharge voltage, the discharge time, the concentration of supporting electrolyte and stearic acid ethanol solution. The wettability, structure and ultimate composition of iron substrate are characterized by contact goniometer, X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy (FTIR) and SEM. It was found that under the optimal conditions, the contact angle (CA) for the modified iron-substrate surfaces is up to154°and the sliding angle (SA)less than5°.Third:Synthesis and characterization of highly absorption resin by using glow discharge electrolysis plasmaA highly absorptive resin poly(butyl acrylate and styrene) is prepared by Emulsion polymerization and glow discharge electrolysis plasma initiate it. The effects of the discharge voltage, discharge time, ratio of the water/oil, polymerization temperature, the amount of the crosslinking agent on the oil absorbency are examined and discussed in detail. The structure and properties of resin are characterized by means of attenuated total reflectance fourier transform infrared spectroscopy(ATR-FTIR), scanning electron microscopy(SEM) and thermogravimetric analysis(TG). The results show that the oil absorbencies were about97g/g for chloroform,56g/g for xylene under the optimal conditions. In addition, the oil absorbency and oil-absorption rate are examined.Fourth:Synthesis and characterization of high oil-absorption resin poly (butyl methacrylate and butyl acrylate) by using glow discharge electrolysis plasmaA highly absorptive resin poly (butyl methacrylate and butyl acrylate) is prepared by emulsion polymerization and glow discharge electrolysis plasma initiate it. The effects of the discharge voltage, discharge time, MBA content, the ratio of monomers on the oil absorbency are examined and discussed in detail. The structure and properties of resin are characterized by means of attenuated total reflectance fourier transform infrared spectroscopy(ATR-FTIR), scanning electron microscopy(SEM) and thermogravimetric analysis(TG). The results show that the oil absorbencies were about70g/g for chloroform,46g/g for xylene under the optimal conditions. In addition, the oil absorbency and oil-absorption rate are examined.