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首页> 外文期刊>Journal of Hazardous Materials >Degradation of antibiotic norfloxacin in aqueous solution by visible-light-mediated C-TiO_2 photocatalysis
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Degradation of antibiotic norfloxacin in aqueous solution by visible-light-mediated C-TiO_2 photocatalysis

机译：可见光介导的C-TiO_2光催化降解诺氟沙星

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摘要

A visible-light-mediated C-TiO_2 photocatalytic process (Vis/C-TiO_2) was employed to degrade antibiotic norfloxacin. The influences of catalyst dosage, initial probe compound concentration and solution Ph levels on the decay performance and reaction kinetics were investigated and optimized. Based on the experimental results, an equation was established to predict the observed rate constant under neutral Ph. In addition, the decay rate was accelerated under weak alkali in the presence of moderate OH~- anions. Hydroxyl radical was confirmed to play a major role in the Vis/TiO_2 process, where in the presence of·OH quencher and electron acceptor, retardation and improvement were found respectively. Furthermore, an original schematic diagram describing the surface property of C-TiO_2 was built and further verified, in which, NH_4~+ cations normally served as hole scavengers showed a negligible effect because the adsorbed OH~- formed a barrier for NH_4~+ ions to approach the holes, and the F~- anions presented a significant suppression on norfloxacin decay due to the formation of hydrogen bond (O-H…F) around the C-TiO_2 surface. Besides, the recycling and sedimentation tests justified that the Vis/C-TiO_2 process is a cost-effective and feasible way for wastewater treatment.
机译：采用可见光介导的C-TiO_2光催化过程（Vis / C-TiO_2）降解抗生素诺氟沙星。研究和优化了催化剂用量，探针化合物的初始浓度和溶液中的Ph水平对衰减性能和反应动力学的影响。根据实验结果，建立了一个方程来预测在中性Ph值下观察到的速率常数。此外，在中等OH-阴离子存在的情况下，在弱碱下衰减速率会加快。羟基被证实在Vis / TiO_2过程中起主要作用，在存在·OH猝灭剂和电子受体的情况下，分别发现了阻滞作用和改善作用。此外，建立并进一步验证了描述C-TiO_2表面性质的原始示意图，其中通常用作空穴清除剂的NH_4〜+阳离子显示微不足道的效果，因为吸附的OH〜-形成了NH_4〜+离子的阻挡层接近孔时，由于在C-TiO_2表面周围形成了氢键（OH…F），F〜-阴离子对诺氟沙星的衰变表现出明显的抑制作用。此外，回收和沉淀测试证明，Vis / C-TiO_2工艺是一种经济有效的废水处理方法。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第15期|p.183-189|共7页
  • 作者

    Meijuan Chen; W. Chu;

  • 作者单位

    Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong;

    Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    norfloxacin; photocatalysis; visible-light-mediated C-TiO_2 process;

    机译：诺氟沙星光催化;可见光介导的C-TiO_2工艺;

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