Effects of Operating Parameters on Electrochemical Degradation of Rhodamine B and Formation of OH Radical Using BDD Electrode

BDD 전극을 이용한 OH 라디칼 생성과 염료 분해에 미치는 운전인자의 영향

  • 박영식 (대구대학교 보건과학부) ;
  • 김동석 (대구가톨릭대학교 환경과학과)
  • Received : 2010.06.21
  • Accepted : 2010.08.12
  • Published : 2010.09.30


The purpose of this study is to degradation of Rhodamine B (RhB, dye) and N, N-Dimethyl-4-nitrosoaniline (RNO, indicator of the electro-generation of OH radical) in solution using boron doped diamond (BDD) electrode. The effects of applied current (0.2~1.0 A), electrolyte type (NaCl, KCl, and $Na_2SO_4$) and electrolyte concentration (0.5~3.0 g/L), solution pH (3~11) and air flow rate (0~4 L/min) were evaluated. Experimental results showed that RhB and RNO removal tendencies appeared with the almost similar thing, except of current. Optimum current for RhB degradation was 0.6 A, however, RNO degradations was increased with increase of applied current. The RhB and RNO degradation of Cl type electrolyte were higher than that of the sulfate type. The RhB and RNO degradation were increased with increase of NaCl concentration and optimum NaCl dosage was 2.5 g/L. The RhB and RNO concentrations were not influenced by pH under pH 7. Optimum air flow rate for the oxidants generation and RhB and RNO degradation were 2 L/min. Initial removal rate of electrolysis process was expressed Langmuir - Hinshelwood equation, which is used to express the initial removal rate of UV/$TiO_$2 process.


Boron doped diamond electrode;Hydroxyl radical;Dye oxidation;Current;Electrolyte


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