Photodegradation efficiency and mechanism of flurbiprofen in water by UV irradiation

doi:10.3785/j.issn.1008-973X.2014.08.005

JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)

ZHOU Hui-hui, YE Miao-miao, ZHANG Tu-qiao, SHAO Yu

Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China

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Abstract

Parameters affecting the photodegradation processes were carried out through the single factor experiments, including reaction temperature, initial flurbiprofen concentration, initial solution pH, humic acid concentration and inorganic ions. The intermediate products were identified by LCMS analysis, and a photodegradation pathway of FBP was proposed. Results show that the photodegradation of FBP follow spseudo-first-order kinetics. The apparent degradation rate constant (k) increases with the increasing reaction temperature or the decreasing initial FBP concentration. And the weak acidity environment (pH=6~7) boasts the best performance on FBP degradation. The low concentration of humic acid has little effect on the photodegradation, while the high concentration (≥10 mg/L) has obviously negative effect. In addition, the inorganic ions have no significant effects on the photodegradation. Finally, the F atom in the FBP molecule could be completely replaced by OH group to form the F , followed by decarboxylation and hydroxylation.

Published: 01 August 2014

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X 131.2

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ZHOU Hui-hui, YE Miao-miao, ZHANG Tu-qiao, SHAO Yu. Photodegradation efficiency and mechanism of flurbiprofen in water by UV irradiation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 1(8): 1376-1383.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.08.005 OR http://www.zjujournals.com/eng/Y2014/V1/I8/1376

紫外光降解水中氟比洛芬的动力学与机理

为了研究水中氟比洛芬紫外光降解的动力学与机理,通过单因素试验考查反应温度、氟比洛芬初始浓度、溶液初始pH值、溶液腐殖酸浓度、常见阴阳离子对氟比洛芬紫外光降解的影响；并通过液相色谱质谱联用定性检测光降解的中间产物,推测可能的光降解途径.结果表明,氟比洛芬紫外光降解过程符合准一级动力学方程；提高反应体系温度,或降低氟比洛芬初始浓度都有助于降解速率常数的提高；氟比洛芬在偏酸性（pH在6～7之间）环境中光降解效果最好；低浓度腐殖酸对光降解几乎没有作用,但当腐殖酸质量浓度超过10 mg/L时,会产生很大抑制作用；天然水中常见阴阳离子对光降解影响很小.此外,在光解过程中,氟原子很容易从苯环上脱落下来,形成F-,继而发生去羧基化和羟基化.

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