高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (11): 1885.

• 研究论文 • 上一篇    下一篇

ZnO超微粒子的EPR特性和光催化性能

井立强1, 郑莹光2, 徐自力3, 董凤霞2, 孙晓君1, 蔡伟民1, 徐英凯4   

  1. 1. 哈尔滨工业大学环境科学与工程系, 哈尔滨 150001;
    2. 吉林大学分析测试实验中心;
    3. 吉林大学境科学与工程系, 长春 130023;
    4. 中国科学院化学研究所, 北京 100080
  • 收稿日期:2000-11-20 出版日期:2001-11-24 发布日期:2001-11-24
  • 通讯作者: 井立强(1973年出生),男,博士研究生,主要从事环境污染与防治等研究.E-mail:JLQiang@sohu.com E-mail:JLQiang@sohu.com

Electronic Paramagnetic Resonance Characteristics of ZnO Ultrafine Particles and Their Photocatalytic Performance

JING Li-Qiang1, ZHENG Ying-Guang2, XU Zi-Li3, DONG Feng-Xia2, SUN Xiao-Jun1, CAI Wei-Min1, XU Ying-Kai4   

  1. 1. Dept.of Environmental Sci.&Eng., Harbin Insti.of Tech., Harbin 150001, China;
    2. Anal.Testing and Exp.Center, Jilin Univ., Changchun 130021, China;
    3. Dept.of Environmental Sci.and Eng., Jilin Univ., Changchun 130021, China;
    4. Instituteof Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2000-11-20 Online:2001-11-24 Published:2001-11-24

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被引次数

206

摘要： 利用XRD,TEM,XPS和EPR等研究了ZnO超微粒子的EPR特性和光催化性能.前驱物碱式碳酸锌在320,430,550和700℃经热处理制得的ZnO超微粒子粒径分别为13.5,19.3,26.1和38.5nm,属六方晶系纤锌矿结构;室温下ZnO超微粒子表现出稳定的单一谱线的EPR信号,其强度随粒径的增大而减小.而在液氮温度下,ZnO超微粒子的EPR谱具有6条强度不等的超精细谱线,在光催化氧化C7H16和SO2过程中,其光催化活性随其EPR信号强度的减小而下降.说明O2-空位在光催化反应中起重要作用.

关键词: ZnO, 超微粒子, EPR, 超精细偶合, 光催化氧化

Abstract: EPRproperties of ZnOultrafine particles(UFP) and their photocatalytic activities were studied by using XRD, TEM, XPSand EPR. Results show that UFPobtained by calcining the precursor, zinc carbonate hydroxide at 320, 430, 550 and 700 ℃, have sizes of 13.5,19.3, 26.1 and 38.5 nm, respectively, with wurtzite structure attached to the hexagonal system. Results also show that at room temperature ZnO UFPhad a significant EPRsignal with single line resulting from the O2-deficiencies on the surface of ZnO UFPwhich can capture and trap electrons so as to form a spin resources with S=1/2. Their EPRintensity decreased with the increase of their sizes. But at the liquid nitrogen temperature, the EPRhad six hyperfine structures resulting from the hyperfine interaction between the electrons traped by O2-deficiencies and the17 Omagnetic nucleus with I=5/2 attached to the absorbed oxygen on the surface of ZnO UFP. The photocatalytic activities of ZnO UFPdecreased as their EPRintensity decreased during the process of photocatalytic oxidation SO2 and C7H16, suggesting that oxygen-deficiencies on the surface of ZnO UFPplayed an important role in photocatalysis.

Key words: ZnO, Ultrafine particle, EPR, Hyperfine interaction, Photocatalytic oxidation

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