RuO2/Ti, PtO2/Ti, IrO2/Ti 및 흑연전극을 이용한 염료폐수의 전기화학적 처리

Abstract

Textile industry is considered as one of the most polluting sectors in terms of effluent composition and volume of discharge. Effluents from textile industry are not only colored but also contain high amounts of organic compounds and dissolved solids. Especially, the azo dyes form the largest polluting group among the synthetic pigments. The electrochemical method treats colors and organic matters by oxidation/reduction of electrode surface. The electrochemical processes are compact and simple, and the rate of pollutants removal is very rapid compared with the other wastewater treatment processes. The removal of dye wastewater containing CI Direct blue 15 was studied by electrochemical treatment process. To find the optimum material of electrode, various materials of electrode (anode and cathode) were tested at different conditions of electrolyte concentration, current density, reaction temperature and initial pH. The cathodes were graphite and stainless-steel plate. The anodes used in the study were RuO2/Ti, PtO2/Ti, IrO2/Ti and graphite plate. De-colorization and degradation of the dye was confirmed by using UV-Vis spectroscopy and TOC measurements. As a result, the removal efficiency of dye was not affected by the material of cathode. As the electrolyte concentration and the current density increased, the removal efficiency of dye was increased. The effect of reaction temperature was various on the kind of anode materials. The performance order of removal efficiency of anodes was RuO2/Ti > PtO2/Ti > IrO2/Ti > graphite in the case of acid condition. Also, RuO2/Ti > IrO2/Ti > PtO2/Ti > graphite in the case of neutral and basic condition. The removal efficiency of organic matter of the end of experiment was not affected by the material of anode. In the above experimental conditions, RuO2/Ti and IrO2/Ti electrode were the best anodic material of electrochemical treatment process of dye wastewater.