Effects of Electrodeposition Parameters on Electrochemical Hydroxyl Radical Evolution of PbO<sub>2</sub> Electrode

Shim, Soojin; Yoon, Jeyong; Shim, Soojin; Yoon, Jeyong

doi:2016.38.12.647

The Korean text of this paper can be translated into multiple languages on the website of http://jksee.or.kr through Google Translator.

J Korean Soc Environ Eng > Volume 38(12); 2016 > Article

Original Paper

J Korean Soc Environ Eng 2016;38(12): 647-655. doi: https://doi.org/10.4491/KSEE.2016.38.12.647

이산화납 전극 제조 시 전기화학적 증착인자가 수산화라디칼 발생에 미치는 영향

심수진¹, 윤제용^1,2

¹서울대학교 아시아에너지환경지속가능발전연구소
²서울대학교 화학생물공학부

Effects of Electrodeposition Parameters on Electrochemical Hydroxyl Radical Evolution of PbO₂ Electrode

Soojin Shim¹, Jeyong Yoon^1,2

¹Asia Institute of Energy, Environment and Sustainability (AIEES), Seoul National University
²School of Chemical and Biological Engineering, Seoul National University

Corresponding author

Jeyong Yoon ,Tel: 02-880-8927, Fax: 02-876-8911, Email: jeyong@snu.ac.kr

Received: November 2, 2016; Revised: November 22, 2016; Accepted: December 13, 2016. Published online: December 31, 2016.

ABSTRACT

Lead dioxide (PbO₂) is an electrode material that is effective for organic pollutant degradation based on hydroxyl radical (･OH) attack. Representative parameters for PbO₂ electrodeposition are summarized to current, temperature, reaction time, concentration of Pb(II) and electrolyte agent. In this study, Ti/PbO₂ electrodes were fabricated by electrodeposition method under controlled reaction time, current density, temperature, concentration of HNO₃ electrolyte. Effects of deposition parameters on ･OH evolution were investigated in terms of electrochemical bleaching of p-Nitrosodimethylaniline (RNO). As major results, the ･OH evolution was promoted at the PbO₂ that was deposited in longer reaction time (1-90 min), lower current density (0.5-50 mA/cm²), higher temperature (5-65℃) and lower HNO₃ concentration (0.01-1.0 M). Especially, the PbO₂ which was deposited in 0.01 M of lowest HNO₃ concentration by applying 20 mA/cm² for above 10 min was most effective on ･OH evolution. The performance gap between PbO₂s that was best and worst in ･OH evolution was about 41%. Among the properties of PbO₂ related on ･OH evolution performance, conductivity of Ti/PbO₂ significantly influenced on ･OH evolution. The increase in conductivity promoted ･OH evolution. In addition, the increase in crystal size of PbO₂ interfered ･OH evolution at surface of some PbO₂ deposits.

Key Words: Lead Dioxide, Electrodeposition, Hydroxyl Radical, RNO Bleaching