波谱学杂志 ›› 1995, Vol. 12 ›› Issue (6): 627-634.

• 研究论文 • 上一篇    下一篇

酰胺化合物于金属修饰的TiO2粒子表面的光催化分解

陆道惠, 陈德文, 徐广智   

  1. 中国科学院化学研究所, 北京 100080
  • 收稿日期:1994-09-05 修回日期:1995-05-24 出版日期:1995-12-05 发布日期:2018-01-17
  • 基金资助:
    国家自然科学基金

PHOTOCATALYTIC DECOMPOSITION OF AMIDES ON THE SURFACE OF SILVER-MODIFIED TiO2 PARTICLES

Lu Daohui, Chen Dewen, Xu Guangzhi   

  1. Institute af Chemistry, The Chinase Academy of Sciences, Beijing 100080
  • Received:1994-09-05 Revised:1995-05-24 Online:1995-12-05 Published:2018-01-17

摘要: 用ESR方法研究了5种脂肪酰胺化合物在经金属银修饰后的二氧化钛微粒表面光诱导电子转移和有关光催化反应行为。结果发现经修饰过的与未修饰过的TiO2粒子的光催化特性有极为明显的差别。
当体系中无TiO2存在时,只是甲酰胺有很微弱的反应,加合物(DMPO-CONH2)·的信号被检出,而其它4种酰胺均无ESR信号。除碳中心自由基外,还有(DMPO-OH)·信号被检出,相同条件下,采用Ag-TiO2时ESK信号明显增强,银用量为10%时比1%的更强。因此半导体TiO2粒子表面进行银修饰后可显著提高光催化能力。

关键词: 酰胺, 二氧化钛, 光催化, 电子自旋共振

Abstract: The photoinduced electron transfer and photocatalytic reaction processes of fivc kinds of amides at the surfaee of silver-modified titanium dioxide(Ag-TiO2) particles have been studied by ESR method.The used amides include fo formamide(FA),dimethylformamide(DMFA),acetamide(AA),dimethylacetamide(DMAA) and propionamide(PA).Results show that the photocatalysis ability of Ag-TiO2 particles is much greater than that of the unmodified TiO2.As without TiO2,the ESR signal of the adduct[DMPO-CONH2] was observcd only in photolysis of formamide system,and no ESR signal was detected for other four kinds of amides.However,the clear ESR signals could be observed for five kinds of amides in the presence of TiO2 particles.Two kinds of carbon centered radicals and hydroxyl radical were detected.ESR signals were obviously enhanced by silver-modified TiO2 particles.At the same condition,the enhancing effect of Ag-TiO2 containing 10% Ag is greater than that of the Ag-TiO2 containing 1% Ag.

Key words: Amide, Titanium dioxide, Photocatalysis, ESR