State Key Laboratory of Pollution Control & Resources Reuse, School of the Environment, Nanjing Univ., Nanjing 210046, China E-mail:
Water Sci Technol. 2014;69(1):76-83. doi: 10.2166/wst.2013.554.
A dielectric barrier discharge (DBD) reactor as one of the advanced oxidation processes was applied to the degradation of diclofenac in aqueous solution. The various parameters that affect the degradation of diclofenac and the proposed evolutionary process were investigated. The results indicated that the inner concentrations of 10 mg/L diclofenac can be all removed within 10 min under conditions of 50 W and pH value of 6.15. The existence of Fe(2+) in the liquid phase can promote the degradation of diclofenac. But it was rather ineffective in mineralization, because the intermediates containing the aromatic rings were recalcitrant to be degraded. Five intermediates were identified by liquid chromatography-mass spectrometry (LC-MS), the OH · radical and O(3) were the major reactive species, and played an important role in the degradation of diclofenac. The toxicity of diclofenac degraded by DBD was assessed and the results indicated the efficiency of the DBD in the detoxification of the diclofenac solution.
介质阻挡放电（DBD）反应器作为一种高级氧化工艺，被应用于水溶液中双氯芬酸的降解研究。考察了影响双氯芬酸降解的各种参数以及提出的演变过程。结果表明，在 50 W 和 pH 值为 6.15 的条件下，内浓度为 10 mg/L 的双氯芬酸可在 10 min 内全部去除。液相中 Fe(2+)的存在可以促进双氯芬酸的降解。但它在矿化方面的效果却很差，因为含有芳环的中间产物难以降解。通过液相色谱-质谱联用（LC-MS）鉴定了 5 种中间产物，OH·自由基和 O(3)是主要的活性物质，在双氯芬酸的降解过程中发挥了重要作用。采用 DBD 降解双氯芬酸的毒性进行了评估，结果表明 DBD 对双氯芬酸溶液的解毒具有效率。
