Dimethoate (DIM) is one of the most extensively applied organophosphorus pesticides (OPs), which is used to boost farm productivity due to its high insecticidal efficacy. However, the excessive use of DIM can result in the extensive contamination of soil, groundwater and food. Monitoring of DIM in environmental and food samples is crucial in view of its potential health risks and environmental hazards from excessive residues. The expensive equipment and complex operations for current detection methods greatly limit their practical applications. Herein, a self-powered photoelectrochemical (PEC) sensing platform based on Ag₂S/SnS₂ photoanode, iron-doped cobalt borate (CBFO) photocathode, and molecularly imprinted polymers (MIPs) was proposed for the detection of DIM. The molecularly imprinted polymers at CBFO photocathode endow the self-powered PEC sensor with high selectivity. The Ag₂S/SnS₂ photoanode enhances the efficient of electron transfer between the photoanode and photocathode, contributing to the high sensitivity of PEC sensor. The self-powered molecularly imprinted PEC sensor exhibits outstanding sensitivity and selectivity for DIM at concentrations from 1 × 10⁻² to 1 × 10⁵ nM with a detection limit of 5.9 pM. Excellent recoveries (95.4 ± 2.6 %, 98.4 ± 2.3 %, 106.3 ± 3.3 %) were achieved in spiked crown pear samples, indicating that the molecularly imprinted PEC sensor is capable of detecting DIM in real samples. This research provides a novel simple, fast, highly selective and sensitive self-powered molecularly imprinted photoelectrochemical sensing platform for detection of DIM. The fabricated PEC sensor offers a promising candidate for the detection method of organophosphorus pesticides residues, which is of great significance for the fields of food safety and environmental protection.

中文翻译：

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基于分子印迹聚合物耦合 CBFO 光阴极面和 Ag2S/SnS2 光阳极的自供电光电化学传感器，用于超灵敏乐果传感


乐果 （DIM） 是应用最广泛的有机磷杀虫剂 （OP） 之一，由于其高杀虫功效而被用于提高农场生产力。然而，过度使用 DIM 会导致土壤、地下水和食物的广泛污染。鉴于 DIM 存在潜在的健康风险和过量残留对环境的危害，因此监测环境和食品样品中的 DIM 至关重要。当前检测方法昂贵的设备和复杂的操作极大地限制了它们的实际应用。在此，提出了一种基于 Ag ₂ S/SnS ₂ 光阳极、铁掺杂硼酸钴 （CBFO） 光阴极面和分子印迹聚合物 （MIP） 的自供电光电化学 （PEC） 传感平台，用于 DIM 的检测。CBFO 光阴极面的分子印迹聚合物赋予自供电 PEC 传感器高选择性。Ag ₂ S/SnS ₂ 光阳极提高了光阳极和光阴极面之间的电子转移效率，有助于 PEC 传感器的高灵敏度。自供电分子印迹 PEC 传感器对浓度为 1 × 10 ⁻² 至 1 × 10 ⁵ nM 的 DIM 表现出出色的灵敏度和选择性，检测限为 5.9 pM。加标冠梨样品的回收率为 95.4 ± 2.6 %、98.4 ± 2.3 %、106.3 ± 3.3 %），表明分子印迹 PEC 传感器能够检测实际样品中的 DIM。本研究提供了一种新型简单、快速、高选择性和灵敏的自供电分子印迹光电化学传感平台，用于 DIM 的检测。 该 PEC 传感器为有机磷农药残留的检测方法提供了有前途的候选者，对食品安全和环境保护领域具有重要意义。