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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (1): 55-59. 上一篇    下一篇

研究论文

含铁的柱撑膨润土光催化降解甲基橙

温丽华ad，李益民acd，刘颖ad，李海洋*1 2   

  1. (1中国科学院安徽光学精密机械研究所环境光谱学实验室 合肥 230031)
    (2中国科学院大连化学物理研究所 大连 116023)
    (3绍兴文理学院化学系 绍兴 312000)
    (4中国科学院研究生院 北京 100039)
  • 投稿日期:2004-02-26 修回日期:2004-09-13 发布日期:2010-12-10
  • 通讯作者: 李海洋

Photocatalytic Degradation of Methyl Orange by Fe-containing Pillared Bentonites

WEN Li-Huaad, LI Yi-Minacd, LIU Yingad, LI Hai-Yang*1,2   

  1. (1 Laboratory of Environment Spectroscopy, Anhui Institute of Optics and Fine Mechanics,
    Chinese Academy of Sciences, Hefei 230031)
    (2 Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023)
    (3 Department of Chemistry, Shaoxing College of Arts and Sciences, Shaoxing 312000)
    (4 Graduate School of the Chinese Academy of Sciences, Beijing 100039)
  • Received:2004-02-26 Revised:2004-09-13 Published:2010-12-10
  • Contact: LI Hai-Yang

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1947

被引次数

95

将两种含铁柱撑膨润土(Fe-Al-Bent和Fe-Bent)用作复相光催化剂, 表征结果证实它们具有很高的比表面积, 铁以高催化活性的α-Fe2O3存在于复相催化剂中. 以甲基橙为目标降解物, 考察了不同类型的催化剂、催化剂用量以及H2O2浓度对其降解的影响, 并与相应的均相Fenton反应进行了比较. 结果表明: 两种复相光催化剂的催化脱色性能和CODCr去除率都很高, 明显优于相应的均相Fenton反应, 且复合铁铝柱撑膨润土(Fe-Al-Bent)比单一的铁柱撑膨润土(Fe-Bent)催化性能更好, 此外它们还具有分离简单、重复使用性好等特点.

关键词: 柱撑粘土(PILC), 复相光催化剂, 光催化降解, 甲基橙

Two kinds of Fe-containing pillared bentonites were used as heterogeneous photocatalysts. Structural characteristics were examined by using XRD, BET and TEM. Results indicate that both catalysts have large surface areas and iron element is in the form of α-Fe2O3 of high catalytic activity. The photocatalytic activities of the photocatalysts were determined by the photo-assisted degradation of an organic azo dye methyl orange, and the influence of different types of catalysts, their amounts and the H2O2 concentration were also investigated. Experimental results show that two kinds of heterogeneous photocatalysts both have high catalytic activities of decoloration and CODCr removal. Degradation ratios of two photocatalysts have predominance compared with those of homogeneous Fenton reactions, respectively. The photocatalytic activity of Fe-Al-Bent is superior to that of Fe-Bent because of its larger surface area and higher acidity. In addition, our experiments also illustrate that Fe-Al-Bent can be easily recovered, regenerated and reused.

Key words: pillared clay, heterogeneous photocatalyst, photocatalytic degradation, methyl orang