Photodegradation of naproxen in water under simulated solar radiation: mechanism, kinetics, and toxicity variation

The main objective of this study was to investigate the degradation mechanism, the reaction kinetics, and the evolution of toxicity of naproxen in waters under simulated solar radiation. These criteria were investigated by conducting quenching experiments with reactive oxygen species (ROS), oxygen c...

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Veröffentlicht in:Environmental science and pollution research international 2014, Vol.21 (13), p.7797-7804
Hauptverfasser: Ma, Dujuan, Liu, Guoguang, Lv, Wenying, Yao, Kun, Zhang, Xiangdan, Xiao, Huahua
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container_issue 13
container_start_page 7797
container_title Environmental science and pollution research international
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creator Ma, Dujuan
Liu, Guoguang
Lv, Wenying
Yao, Kun
Zhang, Xiangdan
Xiao, Huahua
description The main objective of this study was to investigate the degradation mechanism, the reaction kinetics, and the evolution of toxicity of naproxen in waters under simulated solar radiation. These criteria were investigated by conducting quenching experiments with reactive oxygen species (ROS), oxygen concentration experiments, and toxicity evaluations with Vibrio fischeri bacteria. The results indicated that the degradation of naproxen proceeds via pseudo first-order kinetics in all cases and that photodegradation included degradation by direct photolysis and by self-sensitization via ROS; the contribution rates of self-sensitized photodegradation were 1.4 %, 65.8 %, and 31.7 % via ·OH, 1 O 2 and O 2 •− , respectively. Furthermore, the oxygen concentration experiments indicated that dissolved oxygen inhibited the direct photodegradation of naproxen, and the higher the oxygen content, the more pronounced the inhibitory effect. The toxicity evaluation illustrated that some of the intermediate products formed were more toxic than naproxen.
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subjects Aliivibrio fischeri - drug effects
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Chromatography, High Pressure Liquid
Dissolved oxygen
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Experiments
Kinetics
Medical research
Microbial Sensitivity Tests
Molecular Structure
Naproxen - chemistry
Naproxen - radiation effects
Naproxen - toxicity
Oxygen
Oxygen - analysis
Pharmaceuticals
Photodegradation
Photolysis
Photolysis - radiation effects
Pollutants
Reactive Oxygen Species - metabolism
Research Article
Soil sciences
Solar radiation
Studies
Sunlight
Surface water
Toxicity
Ultraviolet radiation
Vibrio fischeri
Waste Water Technology
Water Management
Water Pollutants, Chemical - radiation effects
Water pollution
Water Pollution Control
title Photodegradation of naproxen in water under simulated solar radiation: mechanism, kinetics, and toxicity variation
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