Metal oxide nanomaterial-modified ion-selective electrodes for detection of NH4+ in aquaponic systems: electrochemical analyses, characterization, and sensing mechanism

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-09-08 DOI:10.1007/s11581-024-05799-5
Nguyen Thi Dieu Thuy, Yu Han, Xiaochan Wang, Guo Zhao
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Abstract

Potentiometric NH4+ sensors were developed by modification of ion-selective electrodes with different metal oxide nanomaterials forming solid-contact layers, including titania (TiO2), manganese dioxide (MnO2), and stannic oxide (SnO2). A potentiometric method was used to determine the basic analytical parameters of the sensors. Furthermore, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and water layer tests were used to evaluate the electrochemical features of the electrodes. The results for the modified metal oxides and unmodified electrodes were compared, and the effectiveness of each material as a solid-contact layer on the electrode was evaluated. The best results were found for an electrode with a solid-contact layer of SnO2 nanomaterial (GCE/SnO2/NH4+-ISM). The GCE/SnO2/NH4+-ISM electrode displayed a selective and fast response to NH4+ ions (4.8 s) during the potential measurements. In this case, a slope of 47.17 mV/decade (R = 0.99), a linearity range of 1 × 10−7–1 × 10−2 M, and a limit of detection of 1.18 × 10−8 M were obtained. This electrode exhibited good reproducibility, a high potential response, and stability, making it an attractive alternative for the development of effective SC-ISEs to detect NH4+ in aquaponic nutrient solutions.

Abstract Image

用于检测水生植物系统中 NH4+ 的金属氧化物纳米材料改性离子选择电极:电化学分析、表征和传感机制
通过对形成固体接触层的不同金属氧化物纳米材料(包括二氧化钛(TiO2)、二氧化锰(MnO2)和氧化锡(SnO2))的离子选择电极进行改性,开发了电位计 NH4+ 传感器。采用电位法测定了传感器的基本分析参数。此外,还使用了电化学阻抗谱(EIS)、循环伏安法(CV)和水层测试来评估电极的电化学特性。比较了改性金属氧化物和未改性电极的结果,并评估了每种材料作为电极固体接触层的有效性。结果发现,具有二氧化锡纳米材料固体接触层的电极(GCE/SnO2/NH4+-ISM)效果最好。在电位测量过程中,GCE/SnO2/NH4+-ISM 电极对 NH4+ 离子显示出选择性的快速反应(4.8 秒)。在这种情况下,斜率为 47.17 mV/decade(R = 0.99),线性范围为 1 × 10-7-1 × 10-2 M,检测限为 1.18 × 10-8 M。该电极具有良好的重现性、高电位响应和稳定性,是开发有效的 SC-ISE 以检测水产营养液中 NH4+ 的理想选择。
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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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