Metal Adsorption on Organic and Ceramics Materials by Plasma Treatment for Application to Sterilization and Dehalogenation

摘要

The purpose of this study is to adhere silver and/or sodium to the surface of wood powder and/or ceramics fiber by low temperature plasma irradiation. First, these wood powder and ceramics materials were ozonized by the oxygen plasma irradiation. In this process of a dry condition, these components were oxidized by the strong oxidizability of ozone so that hydrophilic groups such as carboxyl group (·COOH) and hydroxyl group (·OH) were combined on the surface of the materials. Next, as a precursor of silver gas plasma, silver nitrates AgNO_3 gas plasma was generated in a quartz tube and the materials were irradiated in the tube. As the precursor of sodium gas plasma, sodium amide NaNH_2 gas plasma was generated in the quartz tube. The contents of silver and/or sodium to the materials were identified using an XPS. In order to verify the bactericidal effect of the silver carrier adsorbed in the wood powder, the relationship between silver ion concentration and sterilization effect was investigated. As the result, with the increase of the concentration of the silver ion water, the bactericidal effect also increased. With the aim of the removal of hydrogen chloride gas which arises in refuse incinerators, the ceramic fiber which adsorbed the sodium was left in the gas. As the result, the ceramic fiber was able to adsorb much chlorine, and it succeeded in the dehalogenation.