高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

(Au)核(Ag)壳纳米微粒光度法快速检测过氧化氢

蒋治良1,2, 李纪顺2, 张南南2, 梁爱惠2, 刘庆业1, 黄智1   

    1. 广西师范大学环境科学系, 广西环境工程与保护评价重点实验室, 桂林 541004;
    2. 桂林工学院材料与化学工程系, 桂林 541001
  • 收稿日期:2008-03-13 修回日期:1900-01-01 出版日期:2008-10-10 发布日期:2008-10-10
  • 通讯作者: 蒋治良

Rapid Spectrophotometric Detection of Hydrogen Peroxide Using (Au)core(Ag)shell Nanoparticle

JIANG Zhi-Liang1,2*, LI Ji-Shun2, ZHANG Nan-Nan2, LIANG Ai-Hui2, LIU Qing-Ye1, HUANG Zhi1   

    1. Department of Envroinmental Science, Key Laboratory of Environmental Engineering and Protection Evaluation of Guangxi Provinece, Guangxi Normal University, Guilin 541004, China;
    2. Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541001, China
  • Received:2008-03-13 Revised:1900-01-01 Online:2008-10-10 Published:2008-10-10
  • Contact: JIANG Zhi-Liang

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摘要： 以粒径为10 nm的纳米金为晶种, 用柠檬酸钠还原硝酸银制备了平均粒径为30 nm的(Au)核(Ag)壳纳米微粒, 用高速离心纯化除去过量的柠檬酸三钠获得了较纯的(Au)核(Ag)壳纳米微粒, 其吸收峰位于393 nm处. 在pH 4.4的HAc-NaAc缓冲溶液中, Fenton反应产生的羟基自由基可以氧化(Au)核(Ag)壳纳米微粒银层生成银离子, 导致393 nm处的吸光度降低. H2O2的浓度(c)在6.58～421.1 μmol/L范围内与393 nm处的吸光度降低值ΔA 393 nm呈良好的线性关系, 回归方程为ΔA393 nm=0.00111c+0.0210, 相关系数为0.9908, 检出限为1.73 μmol/L. 本方法用于废水样品测定, 结果满意.

关键词: (Au)核(Ag)壳纳米微粒, 离心纯化, Fenton反应, 过氧化氢, 光度法

Abstract: Using 10 nm nanogold as seeds, the (Au)core(Ag)shell nanoparticles were prepared in the presence of AgNO3 and trisodium citrate dehydrate, and they were purified by high-speed centrifugation to remove the excess trisodium citrate. The absorption peak of the purified (Au)core(Ag)shell nanoparticles is at 393 nm. In pH=4.4 HAc-NaAc buffer solution, hydroxyl radical produced from Fenton reaction oxidized the outer silver layer of the nanoparticles to form Ag+, and resulted in decreasing of the absorbance value at 393 nm. The concentration of H2O2 in the range of 6.58—421.1 μmol/L was linear to the decreased absorbance at 393 nm(ΔA393 nm). Its regression equation was ΔA393 nm=0.00111c+0.0210, and the correlation coefficient was 0.9908, with a detection limit of 1.73 μmol/L. This method was applied to the detection of H2O2 in wastewater, with satisfactory results.

Key words: (Au)core(Ag)shell nanoparticle, Centrifugation, Fenton reaction, Hydrogen peroxide, Spectrophotometry

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