title: Ferrate(VI): a green chemical for the oxidation of cyanide in aqueous/waste solutions.
abstract: The higher oxidation state of iron, i.e. Fe(VI), was employed for the oxidation of the important toxic ion cyanide in aqueous/waste waters. Cyanide was oxidized to cyanate, which is 1,000 times less toxic than cyanide, and can often be accepted for its ultimate disposal. It was noted that Fe(VI) is a very powerful oxidizing agent, and can oxidize most of the cyanide within a few minutes, ca 5 minutes, of contact. The extent of the reduction of Fe(VI) was obtained using the UV-Visible measurements. Further, the UV-Visible data was used to explain the reaction kinetics involved in the redox reaction between ferrate(VI) and cyanide. The pseudo-first-order rate constant was calculated by maintaining the cyanide concentration in excess, with the overall second order rate constant values obtained for initial Fe(VI) concentrations of 1.0 and 0.1 mmol/L. The oxidation of cyanide was again confirmed using a cyanide probe. Fe(VI) was further employed for its possible application in the treatment of industrial wastewaters containing cyanide, along with some heavy metals, such as those obtained from electroplating industries.
authors.affiliation: Department of Environmental Engineering, Kwandong University, Gangnung, Korea.
authors.forename: Diwakar
authors.initials: D
authors.lastname: Tiwari
authors.forename: Hyoung-Uk
authors.initials: HU
authors.lastname: Kim
authors.forename: Bong-Jong
authors.initials: BJ
authors.lastname: Choi
authors.forename: Seung-Mok
authors.initials: SM
authors.lastname: Lee
authors.forename: Oh-Heung
authors.initials: OH
authors.lastname: Kwon
authors.forename: Kyu-Man
authors.initials: KM
authors.lastname: Choi
authors.forename: Jae-Kyu
authors.initials: JK
authors.lastname: Yang
mesh_terms: D003486:Cyanides / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical
chemical_list: D003486:Cyanides; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C017311:ferrate ion; D007501:Iron