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Enhanced photodegradation of pentachlorophenol by single and mixed cationic and nonionic surfactants

机译：单一和混合的阳离子和非离子表面活性剂增强的五氯苯酚光降解

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摘要

The photocatalytic degradation of pentachlorophenol (PCP) using a TiO_2 catalyst in a surfactant-containing system was investigated. PCP abatement by photocatalysis was significantly enhanced by the addition of cationic and nonionic surfactants, both single and mixed, at appropriate concentrations. The enhanced photodegradation can be mainly attributed to the formation of admicelles on the TiO_2 surface. This phenomenon can lead to the incorporation of more PCP, thereby providing TiO_2 with remarkably higher capture rates for target pollutants. Hence, PCP was rendered easily available to photo-yielded oxidative radicals on the catalyst surface. Notably, mixed cationic-nonionic surfactants yielded much higher photodegradation efficiencies than the corresponding single surfactants, indicating the existence of a synergistic effect in the complex system. The adsorption behavior of PCP on TiO_2 in the surfactant solutions was investigated to elucidate this synergism. Fourier-transform infrared (FTIR) spectroscopy was adopted to gain insight into the structural changes induced by the surfactants and a better understanding of the surfactant-assisted photocatalytic degradation mechanism was obtained.
机译：研究了在含表面活性剂的体系中使用TiO_2催化剂对五氯苯酚（PCP）的光催化降解。通过添加适当浓度的单一和混合的阳离子和非离子表面活性剂，可以显着提高光催化的五氯苯酚消除能力。增强的光降解作用主要归因于TiO_2表面上的胶束的形成。这种现象可能导致更多PCP的结合，从而为TiO_2提供了更高的目标污染物捕获率。因此，使得PCP易于用于催化剂表面上的光产生的氧化自由基。值得注意的是，混合的阳离子-非离子表面活性剂比相应的单一表面活性剂产生更高的光降解效率，表明在复杂系统中存在协同效应。研究了五氯苯酚在表面活性剂溶液中对TiO_2的吸附行为，以阐明这种协同作用。采用傅里叶变换红外光谱（FTIR）来深入了解表面活性剂引起的结构变化，并获得了对表面活性剂辅助光催化降解机理的更好理解。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.92-99|共8页
  • 作者

    Yaxin Zhang; Huayong Wu; Jing Zhang; Hongtao Wang; Wenjing Lu;

  • 作者单位

    School of Environment, Tsinghua University. Beijing 100084, China;

    School of Environment, Tsinghua University. Beijing 100084, China;

    School of Environment, Tsinghua University. Beijing 100084, China;

    School of Environment, Tsinghua University. Beijing 100084, China;

    School of Environment, Tsinghua University. Beijing 100084, China;

  • 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

    surfactant; photodegradation; pentachlorophenol; adsorption;

    机译：表面活性剂光降解五氯苯酚吸附;

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