C/Fe-Bi2WO6光催化氧化诺氟沙星废水的效能及其机理

doi:10.11944/j.issn.1000-0518.2017.08.170019

摘要/Abstract

摘要：

采用树脂碳化和水热两步法制备C/Fe-Bi₂WO₆光催化剂,对不同光催化剂光催化降解诺氟沙星溶液的去除效果进行对比研究。考察了条件因素对诺氟沙星(NOR)溶液在模拟太阳光下光催化氧化降解的影响规律。结果表明,在实验条件下,NOR光催化氧化降解符合L-H拟一级反应动力学模型,在NOR溶液初始浓度10 mg/L、溶液pH=7.0、催化剂用量0.75 g/L、H₂O₂浓度为200 mg/L、500 W氙灯照射60 min条件下,NOR完全分解,表观速率常数K_app为0.0751 min^-1。采用分子荧光光谱法,对C/Fe-Bi₂WO₆光催化氧化去除NOR体系中羟基自由基生成规律进行研究,并推测了反应机理。结合LC-MS的分析结果,推测了NOR可能的降解路径和中间产物。

关键词: C/Fe-Bi₂WO₆, 光催化氧化, 诺氟沙星

Abstract:

The C/Fe-Bi₂WO₆ photocatalyst was prepared by a two-step method, involving resin carbonization and hydrothermal reaction process. Comparative research on photoactivities of different catalysts was carried out. Influence of condition factors on photocatalytic oxidation degradation of norfloxacin(NOR) solution under simulated sunlight irradiation was investigated. The degrading reaction fits the first-order kinetics well under experimental conditions. After irradiation under a 500 W Xenon lamp for 60 min, NOR completely decomposed with the first order reaction rate constant(K_app) of 0.0751 min^-1 under the conditions that the initial concentration of NOR is 10 mg/L, the C/Fe-Bi₂WO₆ loading is 0.75 g/L, and the concentration of H₂O₂ is 200 mg/L at pH 7.0. The OH formation in C/Fe-Bi₂WO₆ photocatalytic oxidation was studied via molecular fluorescence spectrum, and the possible photocatalytic oxidation mechnasim and the degradation paths and intermediate products of NOR were proposed.

Key words: C/Fe-Bi₂WO₆, photocatalytic oxidation, norfloxacin

陈世界, 汤晓君, 陈茜, 李英杰, 高立娣, 王鹏. C/Fe-Bi₂WO₆光催化氧化诺氟沙星废水的效能及其机理[J]. 应用化学, 2017, 34(8): 936-945.

CHEN Shijie, TANG Xiaojun, CHEN Xi, LI Yingjie, GAO Lidi, WANG Peng. Efficiency and Mechanism of Photocatalytic Oxidation of Norfloxacin in Wastewater by C/Fe-Bi₂WO₆[J]. Chinese Journal of Applied Chemistry, 2017, 34(8): 936-945.

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C/Fe-Bi₂WO₆光催化氧化诺氟沙星废水的效能及其机理

Efficiency and Mechanism of Photocatalytic Oxidation of Norfloxacin in Wastewater by C/Fe-Bi₂WO₆

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