School of Chemical Science and Engineering , Tongji University , Siping Road 1239 , Shanghai 200092 , China.
ACS Appl Mater Interfaces. 2018 May 2;10(17):14869-14876. doi: 10.1021/acsami.8b00289. Epub 2018 Apr 17.
Organophosphorus chemical warfare agents (OPCWAs) are a group of organic pollutants characterized by high toxicity and chemical stability, and they are very difficult to be degraded. The trace quality of OPCWAs in water and food will cause great harm to the human body. Therefore, the detection of OPCWAs is a difficult challenge, which has become the research hotspot over the world. In this work, a Hf-based luminescent metal-organic framework (Eu@1) is prepared, and the reactivity of Hf results in a methanephosphonic acid (MPA)-induced luminescence quenching and the charge transfer from MPA to Hf(IV) and generated exciplexes which are responsible for this quenching effect. The excellent performance of Eu@1 in the detection of MPA, with its finer selectivity, high sensitivity (LOD = 0.4 ppm), and large linear range (10 to 10 M), is encouraging for application in wastewater detection. Importantly, MPA is a pollutant that can be absorbed by plants and causes the bioaccumulation effect, and thus, the detection of MPA in real plant samples is a purposeful topic. Eu@1 also achieved satisfactory results in actual plant sample testing, and the bioaccumulation of MPA in onions, turnips, and cabbages is determined via our sensor. This fabricated detector provides a feasible path for the detection of ppm-level OPCWAs in a complex environment, which will help humans to avoid OPCWA-contaminated foods.
有机磷化学战剂（OPCWAs）是一组具有高毒性和化学稳定性的有机污染物，极难降解。水中和食物中痕量的 OPCWAs 会对人体造成极大的危害。因此，OPCWAs 的检测是一项极具挑战性的难题，已成为全球研究热点。本工作制备了一种基于 Hf 的发光金属有机骨架（Eu@1），Hf 的反应性导致甲膦酸（MPA）诱导的发光猝灭以及从 MPA 到 Hf(IV) 的电荷转移和生成的激基复合物，这是导致猝灭效应的原因。Eu@1 在 MPA 检测方面表现出优异的性能，具有更好的选择性、高灵敏度（LOD=0.4ppm）和较大的线性范围（10 到 10 M），有望应用于废水检测。重要的是，MPA 是一种可以被植物吸收并产生生物累积效应的污染物，因此，检测实际植物样品中的 MPA 是一个有意义的课题。Eu@1 在实际植物样品测试中也取得了令人满意的结果，并通过我们的传感器确定了洋葱、萝卜和卷心菜中 MPA 的生物累积情况。这种制备的探测器为在复杂环境中检测 ppm 级 OPCWAs 提供了可行的途径，有助于人类避免接触 OPCWA 污染的食物。
