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http://dx.doi.org/10.7857/JSGE.2018.23.6.104

Three-dimensional Electrochemical Oxidation process using Nanosized Zero-valent Iron/Activated carbon as Particle electrode and Persulfate  

Min, Dongjun (Department of Civil & Environmental Engineering, Pusan National University)
Kim, Cheolyong (Department of Civil & Environmental Engineering, Pusan National University)
Ahn, Jun-Young (Department of Civil & Environmental Engineering, Pusan National University)
Cho, Soobin (Department of Civil & Environmental Engineering, Pusan National University)
Hwang, Inseong (Department of Civil & Environmental Engineering, Pusan National University)
Publication Information
Journal of Soil and Groundwater Environment / v.23, no.6, 2018 , pp. 104-113 More about this Journal
Abstract
A three-dimensional electrochemical process using nanosized zero-valent iron (NZVI)/activated carbon (AC) particle electrode and persulfate (PS) was developed for oxidizing pollutants. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), and Brunauer-Emmett-Teller (BET) surface area analysis were performed to characterize particle electrode. XRD and SEM-EDS analysis confirmed that NZVI was impregnated on the surface of AC. Compared with the conventional two-dimensional electrochemical process, the three-dimensional particle electrode process achieved three times higher efficiency in phenol removal. The system with current density of $5mA/cm^2$ exhibited the highest phenol removal efficiency among the systems employing 1, 5, and $10mA/cm^2$. The removal efficiency of phenol increased as the Fe contents in the particle electrode increased. The particle electrode achieved more than 70% of phenol removal until it was reused for three times. The sulfate radical played a predominant role in phenol removal according to the radical scavenging test.
Keywords
Particle electrode; Nanosized zero-valent iron; Activated carbon; Persulfate; Electrochemical oxidation;
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