大学化学 >> 2022, Vol. 37 >> Issue (3): 2106002.doi: 10.3866/PKU.DXHX202106002

化学实验 上一篇    下一篇

以金纳米粒子为指示剂的法扬司法测定氯离子

张远馥(), 张金荣, 任姿静, 张熙芳, 商冬丽, 魏琳洁, 李睿, 李霞, 薛庆旺, 张伟, 王术皓   

  • 收稿日期:2021-06-02 录用日期:2021-07-02 发布日期:2021-07-15
  • 通讯作者: 张远馥 E-mail:yuanfu-nice@hotmail.com
  • 作者简介:张远馥, Email: yuanfu-nice@hotmail.com
  • 基金资助:
    国家自然科学基金(21705066)

Determination of Chloride Ion by Fajans Method Using Gold Nanoparticles as the Indicator

Yuanfu Zhang(), Jinrong Zhang, Zijing Ren, Xifang Zhang, Dongli Shang, Linjie Wei, Rui Li, Xia Li, Qingwang Xue, Wei Zhang, Shuhao Wang   

  • Received:2021-06-02 Accepted:2021-07-02 Published:2021-07-15
  • Contact: Yuanfu Zhang E-mail:yuanfu-nice@hotmail.com

摘要:

将纳米材料引入到滴定分析法中,利用柠檬酸钠还原氯金酸法制备了带负电荷的纳米金,然后,以纳米金为吸附指示剂,利用纳米金局部表面等离子体共振特性来确定滴定终点,从而建立了检测氯离子的新型法扬司法。研究表明,该方法在毫摩尔级可准确测定氯离子,并且废液可通过配位反应、沉淀反应和氧化还原反应,将金和银回收再利用,从而降低成本并减少污染。通过本实验的实践,使学生接触到学科的前沿领域,激发学生对科学研究的兴趣,培养学生的科研探究能力,推动绿色化学在本科教学中的应用。

关键词: 纳米金, 吸附指示剂, 法扬司法, 绿色化学

Abstract:

In this work, nanomaterial was introduced into titrimetric analysis. Firstly, gold nanoparticles (AuNPs) with negative charges were prepared by reducing chloroauric acid with sodium citrate. Then, based on localized surface plasmon resonance of AuNPs, a novel Fajans method was designed to detect chloride ion using gold nanoparticles as the adsorption indicator to indicate the titration endpoint. The results showed that the method could accurately determine millimole chloride ion. Moreover, the gold and silver in waste liquid can be recycled through complexation reaction, precipitation reaction and redox reaction, which can reduce the cost and pollution. Through the practice of this experiment, students will study the frontier of the nanomaterial, and their interest in scientific research will be stimulated. Furthermore, the scientific research ability will be cultivated. Finally, the application of green chemistry is promoted in teaching.

Key words: Gold nanoparticles, Adsorption indicator, Fajans method, Green chemistry

MSC2000: 

  • G64