Degradation of dibutyl phthalate (DBP) by UV-254 nm/H2O2photochemical oxidation: kinetics and influence of various process parameters.
Degradation of dibuytl phthalate (DBP), a plasticizer and also a widely distributed endocrine disruptor, by UV-254 nm/H2O2advanced oxidation process (AOP) was investigated in this study. A significant DBP removal of 77.1 % at an initial concentration of 1.0 μM was achieved at UV fluence of 160 mJ/cm2, initial H2O2dosage of 1.0 mM, and pH of 7.6 ± 0.1. The DBP degradation exhibited a pseudo-first-order reaction kinetic pattern, with the rate constants linearly increasing with increasing H2O2dosage while decreasing with increasing initial DBP concentration and pH value in a specific range. DBP destruction was significantly inhibited in the presence of alkalinity and natural organic matter (NOM), two known factors that should be taken a serious consideration of in the research and design of UV/H2O2-based AOPs. Presence of common inorganic anions (i.e., Cl-, SO42-, and NO3-) and metal cations (i.e., Fe3+and Zn2+) had a slight impact on the degradation of DBP, although Cu2+could improve the degradation efficiency even at a concentration as low as 0.01 mg/L, suggesting a strong potential of applying UV/H2O2for the removal of DBP with an environmental relevant level of copper.
SINOPEC Beijing Research Institute of Chemical Industry, Beijing, 102500, China.|Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA.
Dong
D
Wang
Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA.
Xiaodi
X
Duan
Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA.
Xuexiang
X
He
Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA. dionysios.d.dionysiou@uc.edu.
Dionysios D
DD
Dionysiou
D003993:Dibutyl Phthalate / Q000737:chemistry*; D052244:Endocrine Disruptors / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis; D010968:Plasticizers / Q000737:chemistry; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D052244:Endocrine Disruptors; D010968:Plasticizers; D014874:Water Pollutants, Chemical; D003993:Dibutyl Phthalate; D006861:Hydrogen Peroxide
Advanced oxidation processes (AOPs); Dibutyl phthalate; Hydrogen peroxide (H2O2); Hydroxyl radical (HO●); UV-254 nm