title: Fenton degradation of organic compounds promoted by dyes under visible irradiation.
abstract: The influence of dyes on the Fenton reaction of organic compounds under visible irradiation (lambda > 450 nm) was examined. It was found that the presence of dyes could accelerate greatly the Fenton reaction of organic compounds such as salicylic acid, sodium benzenesulfonate, benzyltrimethylammonium chloride, and trichloroacetic acid under visible irradiation and that a complete mineralization of those compounds could also be achieved. The dyes such as Alizarin Violet 3B which has an anthraquinone structure unit showed much more significant effect on the reaction than the dyes such as malachite green without the quinone unit. A reaction mechanism of dye AV as a cocatalyst in the photo-Fenton reaction of organic compounds under visible irradiation is proposed based on the cycle of Fe(3+)/Fe(2+) catalyzed by quinone species and an electron transfer from the excited dye molecule to Fe3+.
authors.affiliation: Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Jiahai
authors.initials: J
authors.lastname: Ma
authors.forename: Wenjing
authors.initials: W
authors.lastname: Song
authors.forename: Chuncheng
authors.initials: C
authors.lastname: Chen
authors.forename: Wanhong
authors.initials: W
authors.lastname: Ma
authors.forename: Jincai
authors.initials: J
authors.lastname: Zhao
authors.forename: Yalin
authors.initials: Y
authors.lastname: Tang
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis* / Q000528:radiation effects; D010777:Photochemistry; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; C045076:Fenton's reagent; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron