전기화학적 공정의 운전인자에 따른 산화제 생성과 염료 분해 특성

Abstract

The purpose of this study is to investigate electro-generation of free Cl, <TEX>$ClO_2$</TEX>, <TEX>$H_2O_2$</TEX> and <TEX>$O_3$</TEX> and degradation of Rhodamine B in solution using Ru-Sn-Sb electrode. Electrolysis was performed in one-compartment reactor using a dimensionally stable anode(DSA) of Ru-Sn-Sb/Ti as the working electrode. The effect of applied current (0.5-3 A), electrolyte type (NaCl, KCl, HCl, <TEX>$Na_2SO_4$</TEX> and <TEX>$H_2SO_4$</TEX>) and concentration (0.5-2.5 g/L), air flow rate (0-3 L/min) and solution pH (3-11) was evaluated. Experimental results showed that concentration of 4 oxidants was increased with increase of applied current, however optimum current for RhB degradation was 2 A. The generated oxidant concentration and RhB degradation of the of Cl type-electrolyte was higher than that of the sulfate type. The oxidant concentration was increased with increase of NaCl concentration and optimum NaCl dosage for RhB degradation was 1.75 g/L. Optimum air flow rate for the oxidants generation and RhB degradation was 2 L/min. <TEX>$ClO_2$</TEX> and <TEX>$H_2O_2$</TEX> generation was decreased with the increase of pH, whereas free Cl and <TEX>$O_3$</TEX> was not affected by pH. RhB degradation was increase with the pH decrease.