title: Photodegradation of 4-tert-butylphenol in aqueous solution by UV-C, UV/H2O2 and UV/S2O8(2-) system.
abstract: The photolytic degradation of 4-tert-butylphenol (4-t-BP) in aqueous solution was investigated using three kinds of systems: UV-C directly photodegradation system, UV/H2O2 and UV/S2O8(2-) system. Under experimental conditions, the degradation rate of 4-t-BP was in the order: UV/S2O8(2-) > UV/H2O2 > UV-C. The reaction kinetics of UV/S2O8(2-) system were thoroughly investigated. The increase of S2O8(2-) concentration enhanced the 4-t-BP degradation rate, which was inhibited when the concentration of S2O8(2-) exceeded 4.0 mM. The highest efficacy in 4-t-BP degradation was obtained at pH 6.5. The oxidation rate of 4-t-BP could be accelerated by increasing the reaction temperature and irradiation intensity. The highest rate constant (kobs = 8.4 × 10(-2) min(-1)) was acquired when the reaction temperature was 45 °C. The irradiation intensity was measured by irradiation distance, and the optimum irradiation distance was 10 cm. Moreover, the preliminary mechanism of 4-t-BP degradation was studied. The bond scission of the 4-t-BP molecule occurred by the oxidation of SO4(•-), which dimerized and formed two main primary products. Under the conditions of room temperature (25 °C ± 1 °C) and low concentration of K2S2O8 (0.5 mM), 35.4% of total organic carbon (TOC) was removed after 8.5-h irradiation. The results showed that UV/S2O8(2-) system was effective for the degradation of 4-t-BP.
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai , China.
authors.forename: Yanlin
authors.initials: Y
authors.lastname: Wu
authors.affiliation: b Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention , Department of Environmental Science and Engineering , Fudan University , Shanghai , China.
authors.forename: Xiufen
authors.initials: X
authors.lastname: Zhu
authors.affiliation: b Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention , Department of Environmental Science and Engineering , Fudan University , Shanghai , China.
authors.forename: Hongche
authors.initials: H
authors.lastname: Chen
authors.affiliation: b Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention , Department of Environmental Science and Engineering , Fudan University , Shanghai , China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Dong
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai , China.
authors.forename: Jianfu
authors.initials: J
authors.lastname: Zhao
mesh_terms: D002681:China; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry*; D010782:Photolysis; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D010636:Phenols; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; C006862:butylphen
keywords: 4-tert-butylphenol; UV/S2O82−; photodegradation; sulfate radical