title: Kinetics of the decoloration of reactive dyes over visible light-irradiated TiO(2) semiconductor photocatalyst.
abstract: Photocatalytic decoloration kinetics of triazine (Reactive Red 11, Reactive Red 2, and Reactive Orange 84) and vinylsulfone type (Reactive Orange 16 and Reactive Black 5) of reactive dyes have been studied spectrophotometrically by following the decrease in dye concentration with time. At ambient conditions, over 90-95% decoloration of above dyes have been observed upon prolonged illumination (15 h) of the reacting system with a 150 W xenon lamp. It was found that the decoloration reaction followed first-order kinetics. The values of observed rate constants were found to be dependent of the structure of dyes at low dye concentration, but independent at higher concentration. It also reports for the first time the decoloration of two different dyes together in a binary dye mixture using visible light-irradiated TiO(2) photocatalyst. Rate of decoloration of two different dyes together in a binary dye mixture using visible light-irradiated TiO(2) photocatalyst is governed by the adsorptivity of the particular dye onto the surface of the TiO(2) photocatalyst.
authors.affiliation: Chemistry Section, Central Mechanical Engineering Research Institute, Durgapur, India. dchat57@hotmail.com
authors.forename: Debabrata
authors.initials: D
authors.lastname: Chatterjee
authors.forename: Vidya Rupini
authors.initials: VR
authors.lastname: Patnam
authors.forename: Anindita
authors.initials: A
authors.lastname: Sikdar
authors.forename: Priyanka
authors.initials: P
authors.lastname: Joshi
authors.forename: Rohit
authors.initials: R
authors.lastname: Misra
authors.forename: Nageswara N
authors.initials: NN
authors.lastname: Rao
mesh_terms: D000327:Adsorption; D002384:Catalysis; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D007700:Kinetics; D010777:Photochemistry; D012666:Semiconductors; D014025:Titanium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; C009495:titanium dioxide; D014025:Titanium