作者：石文兵
作者单位：长江师范学院化学化工学院, 重庆 涪陵 408100
关键词：化学发光; CeO2纳米粒子; 过氧化氢; 鲁米诺
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。
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.
Keywords: chemiluminescence; CeO2 nanoparticles; H2O2; Luminol
2013, 39(3): 34-37 收稿日期: 2012-10-6;收到修改稿日期: 2012-12-23
基金项目: 国家自然科学基金项目(21275021)
作者简介: 石文兵(1976-),男,苗族,湖南凤凰县人,副教授,博士,主要从事药物分析研究。
参考文献
[1] 李建军. 纳米粒子及其材料的应用[J]. 中专物理教学,2000, 8(3):42-43.
[2] 张敬畅,刘慷,曹维良. 纳米粒子的特性、应用及制备方法[J]. 石油化工高等学校学报,2001,14(2):22-25.
[3] 王小康,唐电,张腾. 纳米二氧化铈的研究现状[J]. 国外金属热处理,2003,24(6):11-15.
[4] 李泽彬,殷春浩,赵强. 纳米二氧化铈制备与EPR特性研究[J]. 徐州工程学院学报:自然科学版,2009,24(3):76-79.
[5] Schubert D, Dargusch R, Raitano J, et al. Cerium and yttriumoxide nanoparticles are neuroprotective[J]. Biochem Biophys Res Commun,2006(342):86-91.
[6] Mainak D A S, Swanand P T, Neelima B A,et al. Auto-catalytic ceria nanoparticles offer neuroprotection to adult rat spinal cord neurons[J]. Biomaterials,2007,28(10):1918-1925.
[7] Tarnuzzer R W, Jimmie C L, Swanand P L, et al. Vacancy engineered ceria nanostructures for protection from radiation-induced cellular damage[J]. Nano Lett,2005(5):2573-2577.
[8] Cassandra K R, Swanand P L, Sudipta S L, et al. Superoxide dismutase mimetic properties exhibited by vacanc yengineered ceria nanoparticles [J]. Chem Commun, 2007(1056):1056-1058.
[9] Talib Pirmohamed, Janet M Dowding, Sanjay Singh,et al. Nanoceria exhibit redox state-dependent catalase mimetic activity[J]. Chem Commun,2010(46):2736-2738.
[10] Atul A T, Santimukul S T, Charalambos K T, et al. Oxidase-like activity of polymer-coated cerium oxide nanoparticles[J]. Angew Chem,2009(48):2308-2312.
