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A Study on the Characteristics of Sonication Combined with UV in the Degradation of Phenol  

Kim, Seong-Keun (Department of Environmental Health, School of Public Health, Seoul National University)
Son, Hyun-Seok (Department of Environmental Health, School of Public Health, Seoul National University)
Im, Jong-Kwon (Department of Environmental Health, School of Public Health, Seoul National University)
Khim, Jee-Hyeong (School of Civil, Environmental, Architectural Engineering, Korea University)
Zoh, Kyung-Duk (Department of Environmental Health, School of Public Health, Seoul National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.7, 2010 , pp. 649-655 More about this Journal
Abstract
This study investigated the degradation of phenol using sonication and/or UV-C. The effects of frequency, temperature, pH in solution, argon purging, with UV intensity were estimated in sonication-only, UV-only, and the combined reaction of sonication with UV. The optimum condition for degrading phenol in the sonication-only reaction was 35 kHz, $5^{\circ}C$, and pH 4. As this condition approximately 30% degradation of phenol was achieved within 360 min. However, phenol in the UV-only at $19.3\;mw/cm^2$ under the same condition was completely degraded within 60 min. In the combined system of sonication with UV, the degradation of phenol was well fitted to first-order rate model, and phenol was completely degraded within 360 min and 45 min at UV intensity of $7.6\;mW/cm^2$($17.3{\times}10^{-3}\;min^{-1}$) and $19.3\;mW/cm^2$($138.1{\times}10^{-3}\;min^{-1}$), respectively. Adding methanol, as a radical scavenger, in the phenol degradation in the sonication reaction indicates that OH radical is a major factor in the degradation of phenol. The order of degradation efficiencies of phenol was in the order of as follows; combined reaction of sonication with UV > UV-only > sonication-only.
Keywords
Phenol; Ultrasound; UV; OH Radicals; Methanol;
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Times Cited By KSCI : 2  (Citation Analysis)
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