Electrocatalytic reduction of nitrate using Mg(OH)2 copper modified electrode

IF 2.2 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Iranian Chemical Society Pub Date : 2024-10-28 DOI:10.1007/s13738-024-03115-6

Nadia Ait Ahmed, Katia Hebbache, Samia Kerakra, Nabila Aliouane, Marielle Eyraud

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Abstract

In order to improve the activity of copper (Cu) towards electrolytic reduction of nitrate, thin films of magnesium hydroxide (Mg(OH)₂) were deposited on Cu substrate. For the first time, these films were synthesized by electrochemical deposition in a potassium sulfate bath containing Mg²⁺ at 70 °C. The effect of various experimental parameters, such as deposition time and potential, on the electrocatalytic activity for the nitrate reduction was investigated. Surface analysis techniques (SEM, EDX and XRD) were used to get information on the morphology, the composition and the structure of the deposits. The activity of the modified electrode was studied by cyclic voltammetry, and amperometric method. The modified Mg(OH)₂/Cu sensor exhibited a good electrocatalytic behavior towards the reduction of nitrates with high reproducible reduction peak currents. In addition, the sensor exhibits a linear answer for concentration in nitrate between 0.125 to 7 mM, combined with high sensitivity (24.6 µA mM⁻¹ cm⁻²) and limit of detection (225.35 µM) values. When common interfering molecules were added to the solution, Mg(OH)₂/Cu electrodes have kept their good selectivity. They demonstrated acceptable detection levels for nitrates in tap water.

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使用改性铜镁(OH)2 电极电催化还原硝酸盐

为了提高铜（Cu）电解还原硝酸盐的活性，在铜基底上沉积了氢氧化镁（Mg(OH)2）薄膜。这些薄膜首次是在 70 °C、含 Mg2+ 的硫酸钾浴中通过电化学沉积法合成的。研究了沉积时间和电位等各种实验参数对硝酸盐还原电催化活性的影响。利用表面分析技术（SEM、EDX 和 XRD）了解了沉积物的形态、组成和结构。通过循环伏安法和安培法研究了修饰电极的活性。改性后的 Mg(OH)2/Cu 传感器对硝酸盐的还原具有良好的电催化性能，还原峰电流具有很高的再现性。此外，该传感器对 0.125 至 7 mM 的硝酸盐浓度呈线性响应，灵敏度（24.6 µA mM-1 cm-2）和检出限（225.35 µM）均很高。当溶液中加入常见的干扰分子时，Mg(OH)2/Cu 电极仍能保持良好的选择性。它们对自来水中硝酸盐的检测水平是可以接受的。

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来源期刊

Journal of the Iranian Chemical Society 化学-化学综合

CiteScore

4.40

自引率

8.30%

发文量

230

审稿时长

5.6 months

期刊介绍： JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.