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首页> 外文期刊>Environmental Science & Technology >Photoassisted Degradation of Azodyes over FeO_xH_(2x-3)/Fe~0 in the Presence of H_2O_2 at Neutral pH Values
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Photoassisted Degradation of Azodyes over FeO_xH_(2x-3)/Fe~0 in the Presence of H_2O_2 at Neutral pH Values

机译：在中性pH值下H_2O_2存在下FeO_xH_（2x-3）/ Fe〜0上偶氮染料的光辅助降解

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摘要

Fe~0 was calcined in air at 200℃ and showed enhanced activity in three cycling runs for the degradation of acid red B (ARB) in the presence of H_2O_2 under UVA irradiation. Subsequently, the catalyst's activity was maintained effectively after 10 successive cycling experiments. Moreover, the catalyst was found to be highly effective for the degradation of nonbiodegradable azodyes ARB, reactive brilliant red X-3B, reactive red K-2G, cationic red X-GRL, and cationic blue X-GRL at neutral pH values. On the basis of characterization by X-ray diffraction. X-ray photoelectron spectroscopy, and Fourier transform infrared spectra, the surface layer of the catalyst was mainly composed of α-FeOOH and γ-Fe_2O_3, and the core was Fe~0 (FeO_xH_(2x-3)/Fe~0). FeO_xH_(2x-3)/Fe~0 was very easily recovered from the reaction system by magnetic separation. The degradation of azodyes came from the synergistic effect of the catalysis of galvanic cells and the oxidation of heterogeneous photo-Fenton reaction on the basis of all information obtained under different experimental conditions. By the total organic carbon and GC-MS analysis, the degradation process of ARB was shown to proceed with decolorization and naphthalene ring openings into CO_2 and small organic acid.
机译：Fe〜0在200℃的空气中煅烧，并在UV_2照射下H_2O_2存在下的三个循环中表现出增强的活性，以降解酸性红B（ARB）。随后，在连续10次循环实验后，催化剂的活性得以有效维持。此外，发现该催化剂在中性pH值下对于不可生物降解的偶氮染料ARB，反应性亮红色X-3B，反应性红色K-2G，阳离子红色X-GRL和阳离子蓝色X-GRL的降解非常有效。在通过X射线衍射表征的基础上。 X射线光电子能谱和傅立叶变换红外光谱表明，催化剂的表面层主要由α-FeO​​OH和γ-Fe_2O_3组成，芯为Fe〜0（FeO_xH_（2x-3）/ Fe〜0）。 FeO_xH_（2x-3）/ Fe〜0很容易通过磁分离从反应体系中回收。根据在不同实验条件下获得的所有信息，偶氮染料的降解来自原电池催化的协同作用和异质光芬顿反应的氧化作用。通过总有机碳和GC-MS分析，表明ARB的降解过程是随着脱色和萘环开环进入CO_2和少量有机酸而进行的。

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  • 来源
    《Environmental Science & Technology》 |2007年第13期|p.4715-4719|共5页
  • 作者

    YULUN NIE; CHUN HU; JIUHUI QU; LEI ZHOU; XUEXIANG HU;

  • 作者单位

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, 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 环境化学;
  • 关键词

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