广西师范大学学报（自然科学版） ›› 2022, Vol. 40 ›› Issue (2): 140-148.doi: 10.16088/j.issn.1001-6600.2021041901

• • 上一篇    下一篇

纳米金催化甲酸还原磷钼酸耦合电置换反应-共振瑞利散射测定痕量汞

刘奇文1,2, 李丹1,2, 黄小芳1,2, 梁爱惠1,2*, 蒋治良1,2*   

  1. 1.珍稀濒危动植物生态与环境保护教育部重点实验室(广西师范大学),广西 桂林 541006;
    2.广西环境污染控制理论与技术重点实验室(广西师范大学),广西 桂林 541006
  • 收稿日期:2021-04-19 修回日期:2021-04-29 发布日期:2022-05-31
  • 通讯作者: 梁爱惠(1965—),女,广西岑溪人,广西师范大学研究员。E-mail:ahliang2008@163.com
    蒋治良(1965—),男,广西全州人,广西师范大学教授,博导。E-mail:zljiang@gxnu.edu.cn
  • 基金资助:
    国家自然科学基金(21767004)

A New Strategy for the Determination of Trace Mercury by Resonance Rayleigh Scattering Method Based on Nano-gold Catalytic Amplification and Galvanic Replacement Reaction-phosphomolybdic Acid

LIU Qiwen1,2, LI Dan1,2, HUANG Xiaofang1,2, LIANG Aihui1,2*, JIANG Zhiliang1,2*   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology (Guangxi Normal University), Guilin Guangxi 541006, China
  • Received:2021-04-19 Revised:2021-04-29 Published:2022-05-31

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336

摘要： 在pH=3.1的HCOOH-HCOONa缓冲液中,磷钼酸粒子在450 nm处产生一个共振瑞利散射(RRS)峰。金纳米粒子(AuNPs)可催化磷钼酸-甲酸反应生成磷钼蓝,使得450 nm处磷钼酸的RRS强度线性降低。Hg2+可与AuNPs发生电置换反应,从而抑制AuNPs的催化作用,RRS峰增强。在2.5×10-4～3.5 μmol/L,随着Hg2+浓度的增加,AuNPs的催化作用逐渐减弱,反应液的颜色逐渐从蓝色变为无色,体系在450 nm处的RRS峰值(ΔI)线性增高,其线性方程为ΔI=0.32C+46.1,检出限为0.18 nmol/L。该法用于废水中Hg2+的检测,结果令人满意。

关键词: 汞, 纳米金催化, 静电取代, 磷钼蓝, 共振瑞利散射

Abstract: Phosphomolybdic acid particles have a resonance Rayleigh scattering (RRS) effect, which produces a RRS peak at 450 nm. In the HCOOH-HCOONa buffer solution at pH=3.1, gold nanoparticles (AuNPs) can catalyze the reaction of phosphomolybdic acid-formic acid to produce phosphomolybdenum blue, making the RRS intensity of phosphomolybdic acid linearly decrease at 450 nm. Hg2+ can undergo a galvanic replacement reaction with AuNPs, thereby inhibiting the catalytic effect of AuNPs. In the range of 2.5×10-4-3.5 μmol/L, as the concentration of Hg2+ increases, the catalytic effect of AuNPs gradually weakens, the color of the reaction solution gradually changed from blue to colorless, and the resonance Rayleigh scattering peak of the system at 450 nm increases linearly. The regression equation is ΔI=0.32C+46.1, and the detection limit is 0.18 nmol/L. This method is used for the detection of Hg2+ in wastewater, and the results are satisfactory.

Key words: mercury, nano-gold catalytic, galvanic replacement, phosphorus molybdenum blue, resonance Rayleigh scattering

中图分类号: 

  • O657.3
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