Novel unlabeled electrochemical sensing platform based on highly electroactive Cu-MOF film for nanoplastic detection in water

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL Microchimica Acta Pub Date : 2024-11-29 DOI:10.1007/s00604-024-06841-z

Xue Wang, Zixuan Zhao, Long An, Tianxiang Wang, Xiaojing Yang, Jiajia Shan

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Abstract

An unlabeled electrochemical sensing strategy based on electroactive copper-centered metal–organic framework (Cu-MOF) film coupled with multiwalled carbon nanotubes (MWCNTs) was proposed for the rapid assessment of nanoplastic concentration. The sensing interface was fabricated via the electro-deposition of Cu-MOF on the pre-modified MWCNTs using the cathodic reduction method. The exposed copper active sites in Cu-MOF showed excellent electrochemical activity, which was further enhanced due to rapid electron transfer induced by highly conductive MWCNTs. Through the adsorption functionality of Cu-MOF film towards polystyrene (PS) nanoplastics, the rapid recognition for nanoplastics in aqueous solution was achieved, thereby causing the inhibition of the current response. The results showed a robust dependence of the inhibition rate on the PS mass concentration. The proposed detection method was used for the quantitative determination of PS nanoplastics with the sizes of 100 nm, 500 nm, and 1 μm. The applicability of this electrochemical sensing platform was successfully validated in real-world water sample analysis.

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基于高电活性 Cu-MOF 薄膜的新型非标记电化学传感平台，用于检测水中的纳米塑料

为快速评估纳米塑料的浓度，提出了一种基于电活性铜心金属有机框架（Cu-MOF）薄膜与多壁碳纳米管（MWCNTs）的无标记电化学传感策略。传感界面是通过阴极还原法在预改性的 MWCNTs 上电沉积 Cu-MOF 制成的。Cu-MOF 中暴露的铜活性位点表现出优异的电化学活性，高导电性 MWCNT 诱导的快速电子传递进一步增强了这种活性。通过 Cu-MOF 薄膜对聚苯乙烯（PS）纳米塑料的吸附功能，实现了对水溶液中纳米塑料的快速识别，从而抑制了电流响应。结果表明，抑制率与 PS 的质量浓度密切相关。所提出的检测方法被用于定量检测尺寸为 100 nm、500 nm 和 1 μm 的 PS 纳米塑料。该电化学传感平台的适用性在实际水样分析中得到了成功验证。

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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.