Co(III)/Co(II)계에 의한 에틸렌글리콜의 전기화학적 매개산화

김익성; 최성우; 허창두; 박승조; Ik Seong Kim; Seong Woo Choi; Chang Du Heo; Seung Cho Park

Journal of the Korean Industrial and Engineering Chemistry, Vol.13, No.1, 33-36, February, 2002

Export Citation

Co(III)/Co(II)계에 의한 에틸렌글리콜의 전기화학적 매개산화

Mediated Electrochemical Oxidation of Ethylene Glycol by Co(III)/Co(II) Redox Systems

김익성^†, 최성우¹, 허창두¹, 박승조¹

부산보건환경연구원
¹동아대학교 환경공학과

Ik Seong Kim^†, Seong Woo Choi¹, Chang Du Heo¹, and Seung Cho Park¹

Busan Metropolitan City Institute of Public Health and Environment, Korea
¹Department of Envrionmental Engineering, Dong-A University, Korea

E-mail:

초록

Co(III)/Co(II)계에서 에틸렌 글리콜의 전기화학적 매개 산화에 관한 실험을 하였다. 그 결과, 전류밀도 0.33 A/cm(2)에서는 매개전해 산화 시작 90 min 경과후 제거효율이 20% 미만이었으나 그 이상 전해시간에서는 제거효율이 급격히 증가하여 240 min 후 제거효율은 후 100%이었고 0.50 및 0.67 A/cm(2)에서 180 min 전해반응 후 제거효율은 100%이었다. 지지전해질로 사용한 질산용액 농도가 4.0, 8.0 M이었을 때 0.50 A/dm(2)의 전류밀도로 전해시작 90 min까지 제거효율이 20% 미만이었으나 그 후로 급격히 증가하여 180, 210 min에서 제거효율은 100%이었다. 전류밀도가 0.50 및 0.67 A/cm(2) 에서 8.0 M 지지 전해질에서 180 min간 매개 전해 산화하였을 때 백금과 티탄-이리듐 전극에서의 에틸렌 글리콜 제거효율은 100 과 84.5%이었다. 에틸렌 글리콜을 매개전해 산화할 경우 Co(III)/Co(II) 산화환원계의 산화력이 Fe(III)/ Fe(II) 산화환원계를 사용하였을 경우보다 우수하였다.

We carried out the experiment on the ethylene glycol (EG) oxidation by a mediated eletrochemical oxidation (MEO) process in Co(III)/Co(II) redox system. EG removal efficiency was 20% after applying current density of 0.33 A/cm(2) for 90 min of MEO process; however, it reached 100% if the electrolysis continued for 240 min. The removal efficiency also reached 100% when the applied current densities were 0.50 and 0.67 A/cm(2) for 180 min of MEO process. In the supporting electrolytes of 4.0 and 8.0 M nitric acid with 0.50 A/cm(2), EG removal efficiency was 20% with 90 min of MEO process, however, the efficiency was 100% for both 180 and 210 min duration of MEO process, respectively. In the 8.0M supporting electrolyte and 180 min of MEO process, EG removal efficiency was 100 and 84.5% for the platinum and titan-iridium(Ti-Ir) electrodes, respectively. For EG oxidation by MEO process, Co(III)/Co(II) redox system has shown to be better than Fe(III)/Fe(II) redox system.

Keywords:mediated electrochemical oxidation;Co(III)/Co(II) redox system;current density;titanium-iridium electrode;supporting electrolyte

[References]

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[Referenced By]

[1] Ichikawa Y, Chem. Econ. Eng. Rev., 3(6), 50 (1971)

[2] McGinnia BD, Adams VD, Middlebrooks EJ, J. Chemosphere, 45, 101 (2001)

[3] Steele DF, Platinum Met. Rev., 34(1), 10 (1990)

[4] Malyszko J, Michalkiewicz S, Goral D, Scendo M, J. Appl. Electrochem., 28(1), 107 (1998)

[5] Plecher D, Valdes EM, Electrochim. Acta, 33(4), 505 (1988)

[6] Mentasi E, Baiocchi C, Chem. Rev., 54, 131 (1988)

[7] Farmer JC, Wang FT, Lewis PR, Summers LJ, J. Electrochem. Soc., 139(11), 3025 (1992)

[8] Rajeshwar K, Ibanez J, Environmental Electrochemistry, Academic Press (1997)