title: Photocatalytic removal of cyanide with illuminated TiO(2).
abstract: Effects of TiO(2) dosage, pH and initial cyanide concentration on the removal efficiency of cyanide from aqueous solutions with illuminated TiO(2) 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 TiO(2) dosage increased. However, as no significant increase was observed above 1 g/L TiO(2), an optimum TiO(2) 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 TiO(2) can be effectively applied to treat industrial wastewater contaminated with cyanide.
authors.affiliation: Environmental Health Research Center, Kurdistan University of Medical Science, Sanandaj, Kurdistan, Iran.
authors.forename: M Shirzad
authors.initials: MS
authors.lastname: Siboni
authors.forename: M R
authors.initials: MR
authors.lastname: Samarghandi
authors.forename: J-K
authors.initials: JK
authors.lastname: Yang
authors.forename: S-M
authors.initials: SM
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D002384:Catalysis; D003486:Cyanides / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D003486:Cyanides; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium