An alarming increase in the use of pesticides and organoarsenic compounds and their toxic impacts on the environment have inspired us to develop a selective and highly sensitive sensor for the detection of these pollutants. Herein, a bio-friendly, low-cost Al-based luminescent metal–organic framework (1′)-based fluorescent material is demonstrated that helps in sustaining water quality by rapid monitoring and quantification of a long-established pesticide (pendimethalin) and a widely employed organoarsenic feed additive (roxarsone). A pyridine-functionalized porous aluminum-based metal–organic framework (Al-MOF) was solvothermally synthesized. After activation, it was used for fast (<10 s) and selective turn-off detection of roxarsone and pendimethalin over other competitive analytes. This is the first MOF-based recyclable sensor for pendimethalin with a remarkably low limit of detection (LOD, 14.4 nM). Real-time effectiveness in detection of pendimethalin in various vegetable and food extracts was successfully verified. Moreover, the aqueous-phase recyclable detection of roxarsone with an ultralow detection limit (13.1 nM) makes it a potential candidate for real-time application. The detection limits for roxarsone and pendimethalin are lower than the existing luminescent material based sensors. Furthermore, the detection of roxarsone in different environmental water and a wide pH range with a good recovery percentage was demonstrated. In addition, a cheap and bio-friendly 1′@chitosan@paper strip composite was prepared and successfully employed for the hands-on detection of pendimethalin and roxarsone. The turn-off behavior of 1′ in the presence of pendimethalin and roxarsone was examined systematically, and plausible mechanistic pathways were proposed with the help of multiple experimental evidences.

中文翻译：

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可重复使用的 MOF 涂层壳聚糖@纸条复合材料，用于实时监测环境水、食品和蔬菜样品中农药二甲戊乐灵和有机砷饲料添加剂洛克沙胂的含量


农药和有机砷化合物的使用量惊人增加及其对环境的有毒影响，促使我们开发一种选择性且高灵敏度的传感器来检测这些污染物。在此，证明了一种生物友好型、低成本的铝基发光金属有机骨架（1′）基荧光材料，通过快速监测和定量一种历史悠久的农药（二甲戊灵）和一种化学物质，有助于维持水质。广泛使用的有机砷饲料添加剂（洛克沙胂）。溶剂热合成了吡啶功能化多孔铝基金属有机框架（Al-MOF）。激活后，与其他竞争性分析物相比，它可用于洛克沙胂和二甲戊乐灵的快速（<10 秒）和选择性关闭检测。这是第一个基于 MOF 的二甲戊灵可回收传感器，检测限极低（LOD，14.4 nM）。成功验证了多种蔬菜和食品提取物中二甲戊乐灵检测的实时有效性。此外，洛克沙胂的水相可回收检测具有超低检测限（13.1 nM），使其成为实时应用的潜在候选者。洛克沙胂和二甲戊乐灵的检测限低于现有基于发光材料的传感器。此外，证明了洛克沙胂在不同环境水和较宽pH范围内的检测具有良好的回收率。此外，还制备了一种廉价且生物友好的1′@壳聚糖@纸条复合材料，并成功用于二甲戊灵和洛克沙胂的实际检测。 系统地研究了二甲戊灵和洛克沙胂存在下 1' 的关闭行为，并在多个实验证据的帮助下提出了合理的机制途径。