A rapid colorimetric sensor for the detection of mercury in environmental samples employing 2 aminobenzohydrazide schiff base functionalized silver nanoparticles

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-11-07 DOI:10.1016/j.molstruc.2024.140587

Imdad Ali , Sarzamin Khan , Carlos A.T. Toloza , Zafar Ali Shah , Zafar Iqbal , Riaz Ullah , Muhammad Raza Shah

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引用次数: 0

Abstract

Mercury (Hg²⁺) is an extremely toxic and dangerous element for living organisms. Herein, a simple and selective sensor based on the Schiff base of 2-aminobenzohydrazide with triazole thiazole substituted vanillin (EAHT) functionalized silver nanoparticles (EAHT-AgNPs) is proposed for the detection of Hg²⁺ in environmental water samples. The chemical reduction method was employed to synthesize EAHT-AgNPs using sodium borohydride as the reducing agent. The synthesized nanoparticles were initially confirmed by UV-visible and FTIR spectroscopy, followed by analysis with a zeta sizer to determine their average size, surface charge and polydispersity index. The atomic force microscopy (AFM) and scanning electron microscopy (SEM) were employed to determine the size and morphology of EAHT-AgNPs. Additionally, the functionalized particles exhibited stability at varying pH values, salinity concentrations and elevated temperature. The addition of Hg²⁺ altered the yellow color of EAHT-AgNPs to colorless, confirming the complex formation. The analytical response constructed as a decrease in absorbance versus concentration showed linearity (R² = 0. 991) from 0.1 to 100 µM with a limit of detection of 0.04 µM (40 nM) and limit of quantification of 0.085 µM (85 nM). The sensor was successfully applied for the detection of Hg²⁺ ions in tap water. In conclusion, Schiff base of 2-aminobenzohydrozide with triazole thiazole substituted vanillin silver nanoparticle-based chemosensor is highly sensitive and selective for the detection of Hg²⁺ in water samples. The proposed sensor has been applied for mercury detection tap water, future research should explore its applications in more complex samples like industrial wastewater and marine environments. Further, studies may focus on the integrating of the approach into the portable devices such as smartphone for on-site detection of mercury.

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利用 2 氨基苯甲酰二硫基官能化银纳米粒子检测环境样品中汞的快速比色传感器

汞（Hg2+）是一种对生物体毒性极大的危险元素。本文提出了一种基于 2-aminobenzohydrazide 的席夫碱与三唑噻唑取代香兰素（EAHT）功能化银纳米粒子（EAHT-AgNPs）的简单选择性传感器，用于检测环境水样中的 Hg2+。以硼氢化钠为还原剂，采用化学还原法合成了 EAHT-AgNPs。首先用紫外-可见光光谱和傅立叶变换红外光谱对合成的纳米粒子进行了确认，然后用 zeta 分析仪对其平均粒度、表面电荷和多分散指数进行了分析。原子力显微镜（AFM）和扫描电子显微镜（SEM）用于确定 EAHT-AgNPs 的尺寸和形态。此外，功能化颗粒在不同的 pH 值、盐浓度和高温条件下均表现出稳定性。Hg2+ 的加入使 EAHT-AgNPs 的黄色变为无色，证实了复合物的形成。吸光度的下降与浓度的关系所构建的分析响应显示出 0.1 至 100 µM 的线性关系（R2=0.991），检测限为 0.04 µM（40 nM），定量限为 0.085 µM（85 nM）。该传感器已成功应用于自来水中 Hg2+ 离子的检测。总之，基于 2-aminobenzohydrozide 的希夫碱与三唑噻唑取代香兰素银纳米粒子的化学传感器对检测水样中的 Hg2+ 具有高灵敏度和高选择性。所提出的传感器已应用于自来水中的汞检测，未来的研究应探索其在工业废水和海洋环境等更复杂样品中的应用。此外，研究重点可能是将该方法集成到智能手机等便携式设备中，用于现场检测汞。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.