Department of Chemical Engineering, ETSII, University of Castilla-La Mancha, 13071 Ciudad Real, Spain.
Department of Environmental Science, Center for Advanced Water Purification, Aarhus University, Frederiksborgvej 399 C, DK-4000 Roskilde, Denmark.
J Hazard Mater. 2018 Sep 5;357:457-465. doi: 10.1016/j.jhazmat.2018.06.031. Epub 2018 Jun 21.
Degradation of a diclofenac aqueous solution was performed using persulfate anions activated by ultrasound. The objective of this study was to analyze different parameters affecting the diclofenac (DCF) removal reaction by the ultrasonic persulfate (US/PS) process and to evaluate the role played by various intermediate oxidative species such as hydroxyl- and sulfate radicals, superoxide radical anion or singlet oxygen in the removal process as well as to determine a possible reaction pathway. The effects of pH, initial persulfate anion concentration, ultrasonic amplitude and temperature on DCF degradation were examined. Sulfate and hydroxyl radicals were involved in the main reaction pathway of diclofenac. Diclofenac amide and three hydroxy-diclofenac isomers (3´-hydroxy diclofenac, 4´-hydroxy diclofenac and 5-hydroxy diclofenac) were identified as reaction intermediates.
采用超声激活过硫酸盐阴离子对水溶液中的双氯芬酸进行降解。本研究的目的是分析影响超声过硫酸盐（US/PS）工艺中双氯芬酸（DCF）去除反应的不同参数，并评估羟基和硫酸根自由基、超氧自由基阴离子或单线态氧等各种中间氧化物种在去除过程中所起的作用，以及确定可能的反应途径。考察了 pH 值、初始过硫酸盐阴离子浓度、超声幅度和温度对 DCF 降解的影响。硫酸盐和羟基自由基参与了双氯芬酸的主要反应途径。双氯芬酰胺和三种羟基双氯芬酸异构体（3´-羟基双氯芬酸、4´-羟基双氯芬酸和 5-羟基双氯芬酸）被确定为反应中间体。
