title: Comparative study of diethyl phthalate degradation by UV/H2O2 and UV/TiO2: kinetics, mechanism, and effects of operational parameters.
abstract: The photodegradation of diethyl phthalate (DEP) by UV/H2O2 and UV/TiO2 is studied. The DEP degradation kinetics and multiple crucial factors effecting the clearance of DEP are investigated, including initial DEP concentration ([DEP]0), initial pH values (pH0), UV light intensity, anions (Cl(-), NO(3-), SO4 (2-), HCO3 (-), and CO3 (2-)), cations (Mg(2+), Ca(2+), Mn(2+), and Fe(3+)), and humic acid (HA). Total organic carbon (TOC) removal is tested by two treatments. And, cytotoxicity evolution of DEP degradation intermediates is detected. The relationship between molar ratio ([H2O2]/[DEP] or [TiO2]/[DEP]) and degradation kinetic constant (K) is also studied. And, the cytotoxicity tests of DEP and its degradation intermediates in UV/H2O2 and UV/TiO2 treatments are researched. The DEP removal efficiency of UV/H2O2 treatment is higher than UV/TiO2 treatment. The DEP degradation fitted a pseudo-first-order kinetic pattern under experimental conditions. The K linearly related with molar ratio in UV/H2O2 treatment while nature exponential relationship is observed in the case of UV/TiO2. However, K fitted corresponding trends better in H2O2 treatment than in TiO2 treatment. The Cl(-) is in favor of the DEP degradation in UV/H2O2 treatment; in contrast, it is disadvantageous to the DEP degradation in UV/TiO2 treatment. Other anions are all disadvantageous to the DEP degradation in two treatments. Fe(3+) promotes the degradation rates significantly. And, all other cations in question inhibit the degradation of DEP. HA hinders DEP degradation in two treatments. The intermediates of DEP degradation in UV/TiO2 treatment are less toxic to biological cell than that in UV/H2O2 treatment.
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, Changzhou, People's Republic of China.
authors.forename: Chengjie
authors.initials: C
authors.lastname: Song
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, Changzhou, People's Republic of China. wlp527528@163.com.
authors.forename: Liping
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Pharmaceutical and Life Sciences, Changzhou University, Changzhou, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ren
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Lv
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
authors.forename: Zhonghao
authors.initials: Z
authors.lastname: Sun
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yan
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, Changzhou, People's Republic of China.
authors.forename: Xinying
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, Changzhou, People's Republic of China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Liu
mesh_terms: D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010782:Photolysis; D010795:Phthalic Acids / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; C007379:diethyl phthalate
keywords: Advanced oxidation processes; Diethyl phthalate; Hydrogen peroxide; Kinetics; Molar ratio; Titanium dioxide