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http://dx.doi.org/10.9727/jmsk.2015.28.1.29

Photo-catalytic Oxidation of Cyanide Complexes Associated with Heavy Metals Using UV LED and Pt-dopped TiO2  

Seol, Jeong Woo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Kim, Seong Hee (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Lee, Woo Chun (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Cho, Hyen Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.28, no.1, 2015 , pp. 29-38 More about this Journal
Abstract
Cyanide can be leached out from the cyanidation method which has been used to extract high-purity gold and silver from ores, and it becomes a variety of cyanide complexes associated with heavy metals contained in ores. Such cyanide complexes are considered as persistent and non-degradable pollutants which cause adverse effects on humans and surrounding environments. Based on binding force between heavy metals and cyanide, cyanide complexes can be categorized weak acid dissociable (WAD) and strong acid dissociable (SAD). This study comparatively evaluated the performance of photo-catalytic process with regard to forms of cyanide complexes. In particular, both effects of UV LED wavelength and surface modification of photo-catalyst on the removal efficiency of cyanide complexes were investigated in detail. The results indicate that the performance of photo-catalytic oxidation is significantly affected by the form of cyanide complexes. In addition, the effect of UV LED wavelength on the removal efficiency was quite different between free cyanide and cyanide complexes associated with heavy metals. The results support that the surface modification of photo-catalyst, such as doping can improve overall performance of photo-catalytic oxidation of cyanide complexes.
Keywords
Photo-catalytic oxidation; cyanide complexes; heavy metals; UV LED; titanium dioxide ($TiO_2$); dopping;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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