基于4-巯基苯甲酸和聚乙烯亚胺功能化纳米银的Cr3+检测研究

doi:10.19964/j.issn.1006-4990.2023-0143

摘要/Abstract

摘要：

水体中重金属离子含量过高会导致生态环境及人体健康的严重损害，检测水体中重金属离子含量十分重要。针对目前重金属离子检测灵敏度的问题，合成了4-巯基苯甲酸和聚乙烯亚胺修饰的纳米银材料，并构建了水溶液中铬离子检测体系。考察了不同修饰剂的浓度、体系pH对检测体系的影响。研究结果表明，当4-巯基苯甲酸浓度为1×10^-6 mol/L、聚乙烯亚胺质量浓度为2×10^-8 g/mL、pH=9.73时，该检测体系对Cr³⁺具有良好的检测效果，在最优条件下检测限可达8×10^-7 mol/L。另外，该检测体系能够有效抵抗Al³⁺、Ni²⁺、K⁺、Sr²⁺、Co²⁺、Cu²⁺、Fe³⁺、Zn²⁺的干扰。在Cr³⁺浓度为8×10^-7~1×10^-5mol/L时，符合曲线方程y=0.059 06+0.504 02/［1+10^{（2.593 49×10 -}^x^）×569 909.68］（R²=0.997）。该研究在检测污水中Cr³⁺浓度方面具有较大的应用价值。

关键词: 纳米银, 铬离子, 聚乙烯亚胺

Abstract:

Heavy metal ions in water caused serious damage to the ecological environment and human health.Therefore，it is great significant to detect heavy metal ions in water ecological environment.Aiming at improving the sensitivity for heavy metal detection in aqueous solution，functional silver nanoparticles modified by 4-mercaptobenzoic acid and polyethyleneimine were synthesized to construct the detection system for chromium ions.The effects of different concentrations of modifiers and the pH of the detection system on the detection system were investigated.The results showed that the detecting platform had great results when the concentration of 4-mercaptobenzoic acid and polyethyleneimine were 1×10^-6 mol/L and 2×10^-8 g/mL，respectively，and the pH value was 9.73.Under the optimum conditions，the detection limit of Cr³⁺ could reach as low as 8×10^-7 mol/L with the curve equation（R²=0.997） from 1×10^-5 mol/L to 8×10^-7 mol/L.In addition，the detection system could effectively resist the interferents of Al³⁺，Ni²⁺，K⁺，Sr²⁺，Co²⁺，Cu²⁺，Fe³⁺，Zn²⁺.At Cr³⁺ concentration of 8×10^-7~1×10^-5 mol/L，it was followed the curve equation y=0.059 06+0.504 02/［1+10^{（2.593 49×10 -}^x^）×569 909.68］（R²=0.997）.It had great application value in detecting the concentration of Cr³⁺ in sewage.

Key words: silver nanoparticles, chromium ion, polyethyleneimine

中图分类号:

TQ136.11

祖明华, 曹亚鹏, 李衡, 刘玉敏, 张志昆. 基于4-巯基苯甲酸和聚乙烯亚胺功能化纳米银的Cr³⁺检测研究[J]. 无机盐工业, 2024, 56(4): 78-84.

ZU Minghua, CAO Yapeng, LI Heng, LIU Yumin, ZHANG Zhikun. Study on Cr³⁺ detection based silver nanoparticles modified with 4-mercaptobenzoic acid and polyethyleneimine[J]. Inorganic Chemicals Industry, 2024, 56(4): 78-84.

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样品	实际浓度/ （mol∙L^-1）	检测浓度/ （mol∙L^-1）	回收率/ %
1	3×10^-6	3.3×10^-6	110.0
2	3×10^-6	3.16×10^-6	105.3
3	3×10^-6	3.2×10^-6	106.7
4	6×10^-6	5.3×10^-6	88.3
5	6×10^-6	5.1×10^-6	85.0

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基于4-巯基苯甲酸和聚乙烯亚胺功能化纳米银的Cr³⁺检测研究

Study on Cr³⁺ detection based silver nanoparticles modified with 4-mercaptobenzoic acid and polyethyleneimine

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