A novel electrochemical sensor based on ꞵ-cyclodextrin/bismuth oxybromide/multi-walled carbon nanotubes modified electrode with in situ addition of tetrabutylammonium bromide for the simultaneous detection and degradation of tebuconazole

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2024-10-28 DOI:10.1007/s00604-024-06797-0

Narumon Wannasri, Pikaned Uppachai, Teeradech Senasu, Suwat Nanan, Praewpan Katrun, Jitlada Vichapong, Nutthaya Butwong, Supalax Srijaranai, Siriboon Mukdasai

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Abstract

A novel electrochemical sensor–based glassy carbon electrode (GCE) was fabricated and applied to simultaneous detection and degradation of tebuconazole (TBZ) for the first time. The GCE was consecutively modified by multi-walled carbon nanotubes (MWCNTs), bismuth oxybromide (BiOBr), ꞵ-cyclodextrin (ꞵ-CD), and in situ addition of tetrabutylammonium bromide (TBABr). The detection was based on the decreasing of Bi signal at its anodic potential (E_pa) of 0.05 V. Under the optimum conditions, the modified electrode exhibited a linear response to TBZ in the concentration range 1–100 μg L⁻¹ with a detection limit of 0.9 μg L⁻¹. TBZ was firstly adsorbed on the surface of the modified electrode through host–guest molecule interactions of the ꞵ-CD. The adsorption was further enhanced by the large surface area of BiOBr and MWCNTs. The adsorbed TBZ on the electrode surface hindered the electron transfer of Bi, thus decreasing the oxidation of Bi. In addition, the in situ addition of tetrabutylammonium bromide (TBABr) enriched TBZ via electrostatic interactions, increasing its detection sensitivity. The fabricated electrochemical sensor was applied to determine TBZ in water and soil samples from rice fields with recoveries of 80.5–100.5% and 87.6–112%, respectively. Furthermore, the degradation of TBZ on the modified electrode was studied under a solar light simulator. The degradation percentage (100%) of TBZ (50 µg L⁻¹) was achieved in 5 min owing to the excellent photocatalytic properties of BiOBr.

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基于ꞵ-环糊精/氧溴化铋/多壁碳纳米管修饰电极并原位添加四丁基溴化铵的新型电化学传感器，用于同时检测和降解戊唑醇

制备了一种新型电化学传感器基玻璃碳电极（GCE），并首次将其应用于戊唑醇（TBZ）的同时检测和降解。该 GCE 经多壁碳纳米管 (MWCNTs)、氧溴化铋 (BiOBr)、ꞵ-环糊精 (ꞵ-CD)、原位添加四丁基溴化铵 (TBABr) 连续修饰。检测的依据是 Bi 信号在其阳极电位（Epa）为 0.05 V 时的下降情况。在最佳条件下，修饰电极对浓度范围为 1-100 μg L-1 的 TBZ 呈线性响应，检测限为 0.9 μg L-1。TBZ 首先通过ꞵ-CD 的主客分子相互作用吸附在修饰电极表面。BiOBr 和 MWCNTs 的大表面积进一步增强了吸附效果。电极表面吸附的 TBZ 阻碍了 Bi 的电子传递，从而降低了 Bi 的氧化作用。此外，四丁基溴化铵（TBABr）的原位添加通过静电相互作用富集了 TBZ，提高了其检测灵敏度。制备的电化学传感器被用于检测水稻田水样和土壤样品中的 TBZ，回收率分别为 80.5%-100.5% 和 87.6-112%。此外，还在太阳光模拟器下研究了改性电极上 TBZ 的降解情况。由于 BiOBr 具有优异的光催化性能，TBZ（50 µg L-1）在 5 分钟内就达到了 100% 的降解率。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.