使用环保型沸石-石墨复合电极进行砷的电化学检测

Abdellah Ait baha, R. Idouhli, Kamal Tabit, Hossein Kazemian, M. Khadiri, A. Abouelfida
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引用次数: 0

摘要

本文利用沸石和石墨提出了一种创新、稳定的电化学传感器,用于可靠、准确地检测砷(V)。沸石材料是利用粉煤灰和气相二氧化硅副产品在特定环境(1.5 M NaOH、L/(Si/Al)比为 40、120°C 和 24 小时)下水热法合成的,以解决与废物管理相关的环境问题。使用伏安法和阻抗技术分别在 1.2 V 至 -1.2 V(相对于 SCE)的电位和 100 kHz 至 10 mHz 的频率范围内评估了沸石-石墨修饰电极(ZGME)的性能。结果表明,首次加入沸石具有显著的优势,如价格低廉、操作简单、提高了氧化还原电流和砷的峰值分辨率。ZGME 在中性条件下使用磷酸盐缓冲溶液有效地检测了 As(V),浓度范围为 1 x 10-3 至 1 x 10-6 mol.L-1。该传感器的检出限为 3 μmol.L-1,定量限为 5 μmol.L-1,灵敏度为 0.28 μA/μM.cm2,并具有良好的重现性,为基于沸石的便携式电化学传感器开辟了新的潜力。此外,这项研究还开创性地将沸石用作石墨改性剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electrochemical Detection of Arsenic Using Eco-Friendly Zeolite-Graphite Composite Electrode
This paper presents an innovative and stable electrochemical sensor using zeolite and graphite for the reliable and accurate detection of arsenic(V). The zeolite materials were hydrothermally synthesized using coal fly ash and fumed silica by-products under specific environments (1.5 M NaOH, L/(Si/Al) ratio of 40, 120°C, and 24 hours), addressing environmental concerns related to wastes managment. The performance of the zeolite-graphite modified electrode (ZGME) was evaluated using voltammetric and impedance techniques at potentials between 1.2 V and -1.2 V (vs. SCE) and a frequency range of 100 kHz to 10 mHz, respectively. The results showed that the incorporation of zeolite for the first time offered notable advantages, such as affordability, simplicity, and improved oxidation-reduction current and peak resolution for arsenic. The ZGME effectively detected As(V) under neutral conditions using a phosphate buffer solution, with a concentration range of 1 x 10-3 to 1 x 10-6 mol.L-1. The sensor achieved a detection limit of 3 μmol.L-1, a quantification limit of 5 μmol.L-1, a sensitivity of 0.28 μA/μM.cm2, and exhibited good reproducibility, opening up new potential for portable zeolite-based electrochemical sensors. Moreover, this research pioneers the use of zeolite as a graphite modifier.
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