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    CeO2纳米粒子催化鲁米诺-过氧化氢的化学发光特性

    2013-06-12 中国测试杂志

    石文兵
    (长江师范学院化学化工学院,重庆 涪陵 408100)
    摘  要:在碳酸盐缓冲溶液中,CeO2纳米粒子催化鲁米诺-H2O2发光体系表现出对pH、CeO2纳米粒子放置时间和H2O2浓度依赖的特性。在pH 9.15~11.48时为抑制发光,在pH 11.68~11.90为增敏发光;新鲜制备的纳米粒子表现两种催化效果(抑制或增敏),放置24 h后的纳米粒子均表现增敏效果;在H2O2浓度较低时为抑制发光,在H2O2浓度较高时为增敏发光。初步提出了这一催化特性受CeO2纳米粒子中Ce3+和Ce4+两种价态调控的假设。
    关键词:化学发光;CeO2纳米粒子;过氧化氢;鲁米诺
    中图分类号:O482.31;O614.33+2;TB383;TM930.12    文献标志码:A     文章编号:1674-5124(2013)03-0034-04
    Chemiluminescent properties of Luminol-H2O2 catalyzed by CeO2 nanoparticles
    SHI Wen-bing
    (School of Chemisty and Chemical Engineering,Yangtze Normal University,Fuling 408100,China)
    Abstract: In carbonate buffer solution, the chemiluminescent properties of Luminol-H2O2 catalyzed by CeO2 nanoparticles has strong dependence on pH, CeO2 nanoparticles storage time and H2O2 dependence. In the range of pH 9.15-11.48, it showed chemiluminescence (CL) inhibition, however, in range of pH 11.68-11.90, it displayed CL enhancement. The performance of freshly prepared nanoparticles exhibited two catalytic effect (inhibition or enhancement), and the nanoparticles stored for more than 24 h, shows sensitization effect. CL inhibition was obtained in low H2O2 concentration and CL enhancement could be observed in high H2O2 concentration. A preliminary hypothesis that the catalytic properties of CeO2 nanoparticles on luminol and H2O2 tuned by Ce3+ and Ce4+ valence state has been proposed in this paper.
    Key words: chemiluminescence; CeO2 nanoparticles; H2O2; Luminol
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