naa a22 4500 510751652 CHVBK 20180411083106.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s11270-013-1647-5 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1647-5 Photocatalytic Degradation of Ni(II)-Cyano and Co(III)-Cyano Complexes [Elektronische Daten] [Khemarath Osathaphan, Kaiwit Ruengruehan, Ria Yngard, Virender Sharma] Cyanide and metal-cyanide complexes are common constituents of effluents of mining, petroleum refining, and coal gasification. This paper presents the photocatalytic degradation of free cyanide, Ni(II)-cyanide (Ni(CN)4 2−), and Co(III)-cyanide (Co(CN)6 3−) complexes in aqueous TiO2 suspensions. The effect of pH (9.5-12.0), TiO2 loading (0.1-2.0g/l), and the airflow rate (0.5-2.0l/min) in a photoreactor on the degradation of the cyanide complexes was investigated. Free cyanide fully converted to cyanate (NCO−) under alkaline conditions. The maximum removal of the Ni(CN)4 2− ion in 180min was found to be 90%; forming CN− and NCO− ions as the major and minor products, respectively. Comparatively, the Co(CN)6 3− ion could be degraded only up to 30% in 180min. The schemes of the photocatalytic oxidation of cyanides are briefly described. The possible causes for differences in degradation of Ni(CN)4 2− and Co(CN)6 3− are also discussed. Optimum conditions for efficient removal of Ni(CN)4 2− and Co(CN)6 3− ions separately and in mixtures are given. Springer Science+Business Media Dordrecht, 2013 Cyanide nationallicence Oxidation nationallicence Photocatalysis nationallicence TiO2 nationallicence Cyanide complexes nationallicence Degradation nationallicence Osathaphan Khemarath Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, Thailand aut Ruengruehan Kaiwit Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Bang Khen, Thailand aut Yngard Ria Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, 36849, Auburn, AL, USA aut Sharma Virender Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, 32901, Melbourne, FL, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/8(2013-08-01), 1-7 0049-6979 224:8<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1647-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1647-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Osathaphan Khemarath Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, Thailand aut NATIONALLICENCE 700 1- Ruengruehan Kaiwit Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Bang Khen, Thailand aut NATIONALLICENCE 700 1- Yngard Ria Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, 36849, Auburn, AL, USA aut NATIONALLICENCE 700 1- Sharma Virender Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, 32901, Melbourne, FL, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/8(2013-08-01), 1-7 0049-6979 224:8<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer