title: Degradation of organic ultraviolet filter diethylamino hydroxybenzoyl hexyl benzoate in aqueous solution by UV/H2O2.
abstract: Steady-state and transient-state photolysis experiments were conducted to investigate the degradation of organic ultraviolet filter diethylamino hydroxybenzoyl hexyl benzoate (DHHB) in the aqueous solution by UV/H2O2. Results showed that the obvious degradation of DHHB was not observed under UV irradiation (λ = 254 nm), and the DHHB degradation was conducted due to the oxidation by hydroxyl radical (HO·). While the H2O2 concentration was between 0.05 and 0.10 mol L(-1), the highest DHHB degradation efficiency was obtained. The lower solution pH favored the transformation of DHHB, and the coexisting Cl(-) and NO3(-) ions slightly enhanced the conversion. The degradation of DHHB by HO· followed a pseudo-first-order kinetic model with different initial DHHB concentrations. By intermediate products during DHHB oxidation and laser flash photolysis spectra analysis, a primary degradation pathway was proposed.
authors.affiliation: Department of Environmental Science & Engineering, Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Fudan University, Shanghai, 200433, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Gong
authors.forename: Haixia
authors.initials: H
authors.lastname: Yuan
authors.forename: Pingping
authors.initials: P
authors.lastname: Zhai
authors.forename: Wenbo
authors.initials: W
authors.lastname: Dong
authors.forename: Hongjing
authors.initials: H
authors.lastname: Li
mesh_terms: D000627:Aminophenols / Q000737:chemistry*; D001577:Benzophenones / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D007700:Kinetics; D010084:Oxidation-Reduction; D010782:Photolysis; D011837:Radiation-Protective Agents / Q000737:chemistry*; D012996:Solutions; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D000627:Aminophenols; D001577:Benzophenones; D011837:Radiation-Protective Agents; D012996:Solutions; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; C000597744:diethylamino hydroxybenzoyl hexyl benzoate; D006861:Hydrogen Peroxide