| Ag和Pd及其离子对TiO2光催化分解CH3CHO的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 姚晓斌 马颖 姚建年 |
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| 作者单位： | 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 |
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| 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.
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| 关 键 词： | TiO2光催化 CH3CHO 表面修饰 离子效应 |
| 收稿时间： | 1998-11-17 |
The effects of Ag, Pd and Ag+, Pd2+ on photodegradation of CH3CHO catalyzed by TiO2 |
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| Yao Xiaobin,MA Ying,YAO Jiannian.The effects of Ag, Pd and Ag+, Pd2+ on photodegradation of CH3CHO catalyzed by TiO2[J].Imaging Science and Photochemistry,1999,17(1):12-16. |
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| Authors: | Yao Xiaobin MA Ying YAO Jiannian |
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| Affiliation: | 1. Institute of Chemical Engineering, Amakasu Chemical Industries, Japan;2. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China |
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| Abstract: | Photodegradation of CH 3CHO catalyzed by TiO 2 was accelerated after Ag + or Pd 2+ was added into TiO 2 aqueous suspension. Under nitrogen, Ag + and Pd 2+ only acted as electron acceptors to separate electron and hole well, while under oxygen, Ag + and Pd 2+ not only acted as electron acceptors but also increased H 2O 2 produced by illumination in the suspension. But photocatalytic activity of TiO 2 was only improved under oxygen after surface modification was used. Our results show that the concentration of H 2O 2 in the suspension has great effect on photodegradation of CH 3CHO assisted by TiO 2. |
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| Keywords: | CH3CHO |
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