title: Degradation of triclosan in the presence of p-aminobenzoic acid under simulated sunlight irradiation.
abstract: This study aimed to investigate the degradation of triclosan (TCS) in the presence of p-aminobenzoic acid (PABA) under simulated sunlight irradiation (λ ≥ 290 nm). The effect of PABA concentration, pH, dissolved organic matter (DOM), and DOM-hydrolytic Fe(III) species complexes on the photodegradation of TCS in the presence of PABA (TCS-PABA) was also studied. The photolysis of TCS-PABAobeyed pseudo-first-order kinetics well, and the degradation of TCS-PABAenhanced with increasing solution pH (from 3.0 to 11.0). The presence of PABA inhibited the degradation of TCS-PABA, and the weakest inhibitory effect was observed while the concentration of PABA was 5 mg L-1. The addition of DOM (Suwannee River fulvic acid standard I [SRFA], Suwannee River HA standard II [SRHA], and Suwannee River natural organic matter [SRNOM]) showed different inhibition effects on TCS-PABAdegradation. However, higher Fe(III) concentration at the DOM concentration of 5 mg L-1could favor the formation of DOM-hydrolytic Fe(III) species complexes, further accelerating the degradation of TCS-PABA. In comparison with deionized water (DI water), TCS-PABAcould be better photodegraded in river water nearby the effluent of a wastewater treatment plant. This study provides useful information for understanding the natural behavior of TCS in the presence of other organic contaminants.
authors.affiliation: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Pingping
authors.initials: P
authors.lastname: Zhai
authors.affiliation: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Chen
authors.affiliation: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China. wbdong@fudan.edu.cn.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Dong
authors.affiliation: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China. lihongjing@fudan.edu.cn.
authors.forename: Hongjing
authors.initials: H
authors.lastname: Li
authors.affiliation: Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), UMR CNRS 5256, Université Lyon 1, 2 Avenue Albert Einstein, 69626, Villeurbanne, France.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Chovelon
mesh_terms: D010129:4-Aminobenzoic Acid / Q000737:chemistry / Q000528:radiation effects; D001578:Benzopyrans / Q000737:chemistry; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010782:Photolysis; D045483:Rivers; D013472:Sunlight; D014260:Triclosan / Q000737:chemistry / Q000528:radiation effects; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects
chemical_list: D010129:4-Aminobenzoic Acid; D001578:Benzopyrans; D006812:Humic Substances; D007501:Iron; D014260:Triclosan; D062065:Wastewater; D014874:Water Pollutants, Chemical; C005023:fulvic acid
keywords: Dissolved organic matter (DOM); Photodegradation; River water; Triclosan; p-Aminobenzoic acid