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首页> 外文期刊>Journal of Hazardous Materials >Synergistically catalytic oxidation of toluene over Mn modified g-C_3N_4/ZSM-4 under vacuum UV irradiation
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Synergistically catalytic oxidation of toluene over Mn modified g-C_3N_4/ZSM-4 under vacuum UV irradiation

机译：Mn修饰的g-C_3N_4 / ZSM-4在真空UV辐射下协同催化氧化甲苯

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摘要

The process of vacuum ultraviolet (VUV)-assisted photocatalytic oxidation (PCO) has attracted great interest for volatile organic compounds (VOCs) degradation owing to its strong oxidation capability. However, the O-3 by-product from VUV irradiation causes secondary pollution and needs to be overcome. In this study, a multifunctional photocatalyst of Mn/g-C3N4/ZSM-4 was thus developed by a one-pot hydrothermal method, and then combined with VUV irradiation to eliminate O-3 byproduct as well as enhance toluene degradation via ozone assisted catalytic oxidation (OZCO). Under VUV irradiation alone, 64% of toluene degradation was occurred but 51 ppm of O-3 was residual. In contrast, toluene degradation was enhanced to 96% over the Mn/g-C3N4/ZSM-4 while residual O(3)was decreased to 4 ppm. The enhanced performance was attributed to the synergistic PCO and OZCO, as the Mn modification can efficiently enhance the photocatalytic activity of g-C3N4 and trigger the catalytic ozonation simultaneously. The results of electron spin resonance (ESR) confirmed the generation of reactive species such as center dot OH and center dot O-2(-) by VUV irradiation and then greatly enhanced after Mn/g-C3N4/ZSM-4 was added. Moreover, the possible mechanism of toluene degradation was also revealed through monitoring of
机译：真空紫外线（VUV）辅助光催化氧化（PCO）的过程因其强大的氧化能力而引起了对挥发性有机化合物（VOC）降解的极大兴趣。但是，VUV辐照产生的O-3副产物会造成二次污染，需要克服。在这项研究中，因此通过一锅水热法开发了一种多功能的Mn / g-C3N4 / ZSM-4光催化剂，然后与VUV辐照结合以消除O-3副产物并通过臭氧辅助催化增强甲苯的降解。氧化（OZCO）。仅在VUV照射下，发生了64％的甲苯降解，但残留了51 ppm的O-3。相比之下，甲苯降解提高到Mn / g-C3N4 / ZSM-4的96％，而残留的O（3）降低到4 ppm。增强的性能归因于PCO和OZCO的协同作用，因为Mn改性可以有效增强g-C3N4的光催化活性并同时触发催化臭氧化作用。电子自旋共振（ESR）的结果证实了通过VUV辐射产生反应性物种，例如中心点OH和中心点O-2（-），然后在添加Mn / g-C3N4 / ZSM-4之后大大增强。此外，还通过监测对甲苯的降解揭示了甲苯降解的可能机理。

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  • 来源
    《Journal of Hazardous Materials》 |2018年第may5期|91-100|共10页
  • 作者

    Xia Dehua; Xu Wenjun; Hu Lingling; He Chun; Leung Dennis Y. C.; Wang Wanjun; Wong Po Keung;

  • 作者单位

    Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China;

    Guangdong Univ Technol, Sch Environm Sci & Engn, Inst Environm Hlth & Pollut Control, Guangzhou 510006, Guangdong, Peoples R China;

    Chinese Univ Hong Kong, Sch Life Sci, Shatin, Hong Kong, Peoples R 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

    Mn/g-C3N4/ZSM-4; Multi-functional photocatalyst; VUV irradiation; O-3 Elimination; VOCs degradation;

    机译：Mn / g-C3N4 / ZSM-4;多功能光催化剂;VUV照射;消除O-3;VOCs降解;

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