Effects of TiO2 dosage, pH and initial cyanide concentration on the removal efficiency of cyanide from aqueous solutions with illuminated TiO2 have been investigated. Adsorption and oxidation were recognized as significant processes for the elimination of cyanide. From the Langmuir isotherm, the maximum adsorption capacity was determined as 17.24 mg/g at pH 7. Adsorbed amount of cyanide slightly increased as the TiO2 dosage increased. However, as no significant increase was observed above 1 g/L TiO2, an optimum TiO2 dosage was determined as 1 g/L. Photocatalytic oxidation efficiency of cyanide was greatly affected by the solution pH. It increased as the solution pH decreased. The photocatalytic oxidation efficiency after 120 min was 80.4% at pH 3 while it was only 20.4% at pH 11. Photocatalytic oxidation of cyanide was well described by the second-order kinetics. Photocatalytic reaction with illuminated TiO2 can be effectively applied to treat industrial wastewater contaminated with cyanide.
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Research Article|
October 01 2011
Photocatalytic removal of cyanide with illuminated TiO2
M. Shirzad Siboni;
M. Shirzad Siboni
1Environmental Health Research Center, Kurdistan University of Medical Science, Sanandaj, Kurdistan, Iran
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M. R. Samarghandi;
M. R. Samarghandi
2Department of Environmental Health, Hamadan University of Medical Science, Hamadan, Iran
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J.-K. Yang;
J.-K. Yang
3Division of General Education, Kwangwoon University, Seoul, Korea
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S.-M. Lee
4Department of Environmental Engineering, Kwandong University, Gangnung, Korea
E-mail: leesm@kd.ac.kr
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Water Sci Technol (2011) 64 (7): 1383–1387.
Article history
Received:
April 18 2011
Accepted:
June 13 2011
Citation
M. Shirzad Siboni, M. R. Samarghandi, J.-K. Yang, S.-M. Lee; Photocatalytic removal of cyanide with illuminated TiO2. Water Sci Technol 1 October 2011; 64 (7): 1383–1387. doi: https://doi.org/10.2166/wst.2011.738
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