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J Korean Soc Environ Eng > Volume 37(1); 2015 > Article
J Korean Soc Environ Eng 2015;37(1): 34-44. doi: https://doi.org/10.4491/KSEE.2015.37.1.34
자외선 LED를 이용한 자유 시안의 광촉매 산화
김성희, 설정우, 이우춘, 이상우, 김순오
경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소
Photocatalytic Oxidation of Free Cyanide Using UV LED
Seong Hee Kim, Jeong Woo Seol, Woo Chun Lee, Sang-Woo Lee, Soon-Oh Kim
Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University
Corresponding author  Soon-Oh Kim ,Tel: 055-772-1477, Fax: 055-772-1479, Email: sokim@gnu.ac.kr
Received: November 23, 2014;  Revised: January 6, 2015;  Accepted: January 12, 2015.  Published online: January 31, 2015.
ABSTRACT
This study was initiated to remove free cyanide from wastewater using the process of photocatalytic oxidation. UV lamp has been extensively used as a light source in conventional photocatalytic oxidation, but numerous drawbacks of UV lamp have been raised so far. Thus, this study focused on evaluating the applicability of UV LED as an alternative light source to overcome the drawbacks of UV lamp. Furthermore, the effects of diverse operational parameters on the performance of process were investigated. The results demonstrated the applicability of UV LED as a substitute of UV lamp. Also, the results show that the performance of process was improved by the increase in the number of UV LEDs used. To acquire economic feasibility as well as high efficacy, however, it is required to determine the optimum number of UV LED prior to practical implementation of the process. Among the three types of photocatalysts (anatase, rutile, and Degussa P25) tested, the Degussa P25 showed the greatest performance, and it was proven that the process was not improved as much as the Degussa P25 through simple mixing of anatase and rutile without any pretreatment. In addition, the removal efficiency of free cyanide appeared to be increased with the decrease in the particle size of TiO2 photocatalyst. Besides, the process was enhanced with injection of oxygen which is considered as a major electron acceptor in the photocatalytic oxidation.
Key Words: Free Cyanide, Photocatalytic Oxidation, UV Lamp, UV LED, Titanium Dioxide (TiO2)
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