Ag和Pd及其离子对TiO2光催化分解CH3CHO的影响

doi:10.7517/j.issn.1674-0475.1999.01.12

影像科学与光化学 ›› 1999, Vol. 17 ›› Issue (1): 12-16.DOI: 10.7517/j.issn.1674-0475.1999.01.12

Ag和Pd及其离子对TiO₂光催化分解CH₃CHO的影响

姚晓斌¹, 马颖², 姚建年²

1. 甘糟化学产业株式会社化工研究所, 日本;
2. 中国科学院感光化学研究所, 北京100101

收稿日期:1998-11-17 修回日期:1998-11-23 出版日期:1999-02-20 发布日期:1999-02-20
通讯作者: 姚建年

THE EFFECTS OF Ag, Pd AND Ag⁺, Pd²⁺ ON PHOTODE GRADATION OF CH₃CHO CATALYZED BY TiO₂

YAO Xiaobin¹, MA Ying², YAO Jiannian²

1. Institute of Chemical Engineering, Amakasu Chemical Industries, Japan;
2. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China

Received:1998-11-17 Revised:1998-11-23 Online:1999-02-20 Published:1999-02-20

摘要/Abstract

摘要： 当用能量大于其禁带宽度的光照射通有氧气的TiO₂悬浮液时,在TiO₂微粒表面会产生反应活性很高的空穴和O₂^-、H₂O₂等多种活性氧.在上一篇文章中^[1]我们已报道了在通氧气和紫外光照的条件下,向TiO₂悬浮液中加入少量Ag⁺或Pd²⁺,将会大幅度提高体系中H₂O₂的生成量.另外,蔡汝雄等人也曾通过向TiO₂悬浮液中加入SOD的方法来提高其中H₂O₂的生成量^[2],而且证明了H₂O₂生成量的增多有助于杀死子宫癌细胞^[3].另一方面,利用TiO₂光催化来分解处理工业废水中的有机物已多见报道^[4～7].因此,为考察H₂O₂含量的增加是否有助于TiO₂催化分解有机物,我们以CH₃CHO为氧化对象,测定了经Ag和Pd表面修饰以及直接向悬浮体系添加Ag⁺或Pd²⁺离子前后,TiO₂光催化氧化分解CH₃CHO效率的变化,并对氮气和氧气气氛的实验结果进行了测定和比较.

关键词: TiO₂光催化, CH₃CHO, 表面修饰, 离子效应

Abstract: Photodegradation of CH₃CHO catalyzed by TiO₂ was accelerated after Ag⁺ or Pd²⁺ was added into TiO₂ aqueous suspension. Under nitrogen, Ag⁺ and Pd²⁺ only acted as electron acceptors to separate electron and hole well, while under oxygen, Ag⁺ and Pd²⁺ not only acted as electron acceptors but also increased H₂O₂ produced by illumination in the suspension. But photocatalytic activity of TiO₂ was only improved under oxygen after surface modification was used. Our results show that the concentration of H₂O₂ in the suspension has great effect on photodegradation of CH₃CHO assisted by TiO₂.

Key words: photocatalysis of TiO₂, CH₃CHO, surface modification, ionic effect

姚晓斌, 马颖, 姚建年. Ag和Pd及其离子对TiO₂光催化分解CH₃CHO的影响[J]. 影像科学与光化学, 1999, 17(1): 12-16.

YAO Xiaobin, MA Ying, YAO Jiannian. THE EFFECTS OF Ag, Pd AND Ag⁺, Pd²⁺ ON PHOTODE GRADATION OF CH₃CHO CATALYZED BY TiO₂[J]. Imaging Science and Photochemistry, 1999, 17(1): 12-16.

参考文献

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Ag和Pd及其离子对TiO₂光催化分解CH₃CHO的影响

THE EFFECTS OF Ag, Pd AND Ag⁺, Pd²⁺ ON PHOTODE GRADATION OF CH₃CHO CATALYZED BY TiO₂

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