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Europium-based infinite coordination polymer nanospheres as an effective fluorescence probe for phosphate sensing

机译：基无限配位聚合物纳米球作为磷酸盐感测的有效荧光探针

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Although phosphate plays important roles in aquatic ecosystems as an indispensible nutrient, excessive levels are responsible for severe environmental issues. Hence, it is of considerable significance to develop highly sensitive and reliable probes for the detection of phosphate with the purpose of monitoring of water quality security and early-warning of eutrophication occurrence. In this work, uniform europium-based infinite coordination polymer (Eu-ICP) nanospheres are rationally constructed by a facile one-step solvothermal treatment. It is demonstrated that the newly developed sensing platform features excellent fluorescence properties, which can be efficiently quenched by the presence of phosphate ions (Pi). Typically, a good linearity exists between the decrease in fluorescence intensities and the Pi analyte content ranging from 2–100 μM, allowing the reliable determination of Pi concentration. Accordingly, the detection limit is estimated to be 0.83 μM, which is far below the detection requirement of phosphate discharge criteria in the water environment. It is noteworthy that the prepared Eu-ICP probe displays a specific recognition towards Pi, and is hardly affected by other possible existing species in natural water. More importantly, the proposed fluorescent probe can be utilized for reliable determination of Pi concentration in real water with acceptable recoveries, highlighting its feasibility in complicated environmental samples. Further research suggests that the underlying sensing mechanism is based on the strong affinity between europium centers and Pi, resulting in the collapse of the inherent structure of Eu-ICP and the corresponding fluorescence quenching. These findings show that the developed Eu-ICP probe holds great prospect in monitoring water quality and early warning of eutrophication based on the unique features associated with this simple preparation procedure, high selectivity, and excellent sensitivity.
机译：尽管磷酸盐作为不可缺少的营养物在水生生态系统中起着重要的作用，但是过量的磷酸盐却导致了严重的环境问题。因此，开发用于监测磷酸盐的高度灵敏和可靠的探针，以监测水质安全性和富营养化发生的早期警告，具有重要意义。在这项工作中，均匀的euro基无限配位聚合物（Eu-ICP）纳米球是通过简便的一步溶剂热处理合理地构建的。事实证明，新开发的传感平台具有出色的荧光特性，可以通过存在磷酸根离子（Pi）来有效地淬灭。通常，在荧光强度下降和2–100μM之间的Pi分析物含量之间存在良好的线性关系，从而可以可靠地确定Pi浓度。因此，检测限估计为0.83μM，远低于水环境中磷酸盐排放标准的检测要求。值得注意的是，所制备的Eu-ICP探针对Pi表现出特定的识别能力，几乎不受天然水中其他可能存在的物种的影响。更重要的是，所提出的荧光探针可用于以可接受的回收率可靠地测定实际水中的Pi浓度，从而突出了其在复杂环境样品中的可行性。进一步的研究表明，潜在的感应机制是基于euro中心与Pi之间的强亲和力，导致Eu-ICP的固有结构崩溃和相应的荧光猝灭。这些发现表明，开发的Eu-ICP探针基于与该简单制备过程相关的独特功能，高选择性和出色的灵敏度，在监测水质和富营养化预警方面具有广阔的前景。

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