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    CeO2納米粒子催化魯米諾-過氧化氫的化學發光特性

    2013-06-12 中國測試雜志

    石文兵
    (長江師范學院化學化工學院,重慶 涪陵 408100)
    摘  要:在碳酸鹽緩沖溶液中,CeO2納米粒子催化魯米諾-H2O2發光體系表現出對pH、CeO2納米粒子放置時間和H2O2濃度依賴的特性。在pH 9.15~11.48時為抑制發光,在pH 11.68~11.90為增敏發光;新鮮制備的納米粒子表現兩種催化效果(抑制或增敏),放置24 h后的納米粒子均表現增敏效果;在H2O2濃度較低時為抑制發光,在H2O2濃度較高時為增敏發光。初步提出了這一催化特性受CeO2納米粒子中Ce3+和Ce4+兩種價態調控的假設。
    關鍵詞:化學發光;CeO2納米粒子;過氧化氫;魯米諾
    中圖分類號:O482.31;O614.33+2;TB383;TM930.12    文獻標志碼:A     文章編號: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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