物理化学学报 >> 2005, Vol. 21 >> Issue (06): 622-626.doi: 10.3866/PKU.WHXB20050609

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铝片表面阳极氧化铝膜的光催化作用

邵宇; 戴文新; 王绪绪; 丁正新; 刘平; 付贤智   

  1. 福州大学光催化研究所, 福州 350002
  • 收稿日期:2004-10-19 修回日期:2004-12-27 发布日期:2005-06-15
  • 通讯作者: 王绪绪 E-mail:xwang@fzu.edu.cn

The Photocatalytic Property of Anodized Al2O3 Film on Al Surface

SHAO Yu; DAI Wen-xin; WANG Xu-xu; DING Zheng-xin; LIU Ping; FU Xian-zhi   

  1. Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002
  • Received:2004-10-19 Revised:2004-12-27 Published:2005-06-15
  • Contact: WANG Xuxu E-mail:xwang@fzu.edu.cn

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摘要： 采用阳极电化学氧化在铝片表面制备出表面含有氧化铝膜的铝片(AAO/Al), 分别用FTIR-ATR技术和密闭间歇式反应装置考察了该样片对油酸和乙烯的光解作用, 结合UV-DRS和FTIR表征结果对薄膜在油酸和乙烯光解中的作用进行了探讨. 结果表明：AAO/Al能够吸收小于265 nm的紫外光, 而无AAO膜的铝片对波长大于220 nm的紫外光没有任何吸收；254 nm紫外光照射下AAO/Al对油酸和乙烯的光解具有明显的促进作用, 光照3 h油酸的分解率达到70%, 乙烯也有9%的分解, 但相同条件下在无AAO膜的铝片上, 油酸的光解率仅为30%, 乙烯几乎不分解；然而, 在365 nm紫外光照射下, AAO/Al同纯铝片一样对两反应物的光解都没有任何促进作用. 分析认为, AAO膜能吸收254 nm的紫外光和对有机物分解具有光催化作用的可能原因是在AAO膜结构中存在过量的Al原子和氧空位.

关键词: 光催化, 阳极氧化铝膜, 油酸, 乙烯

Abstract: An alumina film(AAO/Al) was prepared on Al plate surface by anodic oxidation. The photodecompositions of oleic acid and C2H4 were examined on the AAO/Al and a nude Al piece with FTIR-ATR and a batch reactor, respectively. The function of AAO film in the photodecomposition was discussed by combination of the activity studies with the results of characterizations of UV-DRS and FTIR. It was showed that the AAO/Al could absorb UV light of wavelength ＜ 265 nm, and the nude Al piece didn't absorb the light of wavelength ＞ 220 nm. The AAO/Al could enhance the photodecomposition of oleic acid and ethylene by irradiation of 254 nm UV light but the nude Al piece couldn't. For on AAO/Al, the conversions of oleic acid and ethylene were 70% (upon the illumination for 3 h) and 9% (upon the illumination for 4 h ), respectively；while for on the nude Al piece, the conversion of oleic acid was 30% and no oxidation of ethylene occurred. AAO/Al didn't present any enhancement to the photodecomposition under irradiation of 365 nm light, the conversion of oleic acid was ca 20% which was comparable with that on nude Al, and the photodecomposition of ethylene didn't occur on both samples. It was suggested that the AAO film could be excited by 254 nm light so as to present photocatalytic function, which resulted from the superfluous Al atoms and oxygen-deficient defects in its structure.

Key words: Photocatalysis, Anodic aluminium oxidation films, Oleic acid, Ethylene