title: Degradation of C.I. Acid Orange 7 by the advanced Fenton process in combination with ultrasonic irradiation.
abstract: The combination of ultrasound and the advanced Fenton process (AFP, zero-valent iron and hydrogen peroxide) for the degradation of C.I. Acid Orange 7 was studied. The effect of hydrogen peroxide concentration, initial pH, ultrasonic power density, dissolved gas, and iron powder addition on the decolorization of C.I. Acid Orange 7 was investigated. A modified pseudo-first order kinetic model was used to simulate the experimental results. The results showed that the decolorization rate increased with the increase of hydrogen peroxide concentration and power density, but decreased with the increase of initial pH value. There existed an optimal iron powder addition when decolorization rate was concerned. The decolorization efficiency also increased with the increase of hydrogen peroxide concentration, but decreased with the increase of initial pH value. It varied little at different power densities or iron powder additions at the fixed hydrogen peroxide concentration. The presence of dissolved gas would enhance color removal, and the enhancement was more significant when dissolved oxygen was present. More hydrogen peroxide dosage and reaction duration are required to achieve a relatively high COD removal than those employed to simply break the chromophore group.
authors.affiliation: Department of Environmental Engineering, Wuhan University, Luoyu Road, 129#, Wuhan 430079, PR China. eeng@whu.edu.cn
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhang
authors.forename: Chunyang
authors.initials: C
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Daobin
authors.initials: D
authors.lastname: Zhang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D013010:Sonication; D013997:Time Factors; D014465:Ultrasonics
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; C045076:Fenton's reagent; D006861:Hydrogen Peroxide; D007501:Iron; C014722:2-naphthol orange; D010100:Oxygen