Recyclable Magnetic Fluorescent Fe3O4@SiO2 Core-Shell Nanoparticles Decorated with Carbon Dots for Fluoride Ion Removal
Recyclable Magnetic Fluorescent Fe3O4@SiO2 Core-Shell Nanoparticles Decorated with Carbon Dots for Fluoride Ion Removal
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碳点修饰的可回收磁性荧光 Fe3O4@SiO2 核壳纳米粒子用于去除氟离子
DOI：
10.1021/acsanm.1c00238
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发表时间：
2021
影响因子：
5.9
通讯作者：
Zhuang Lin
中科院分区：
文献类型：
--
作者：
Li Xiaolei;Lin Han;Li Qianli;Xue Jingyi;Xu Yue;Zhuang Lin
大量的努力致力于开发具有生物相容性和环状特征的荧光探针。在高毒性、在水溶液中分散性差、效率低和高检测限问题方面仍然存在挑战。受胺修饰的碳量子点（NCDs）的低生物毒性和高量子产率以及金属离子（Mn+离子）与碳量子点之间的可逆结合的启发，基于从NCDs到Mn+离子的非辐射电子转移机制创建荧光猝灭受体。该荧光猝灭受体配位在介孔超顺磁性Fe3O4@mSiO2纳米粒子上，形成Fe3O4@mSiO2-SiCDs@DTPA-Mn+/NCDs探针结构。当探针置于待检测的环境中时，NCD与金属离子分离并恢复其荧光。环境中氟离子（F-离子）的浓度可以通过分离的NCD的荧光强度来确定。这种新型纳米探针具有可回收性能，可重复使用至少6次。最低检测限为65 nM，线性范围为1 ~ 25 μM。离子去除能力可达21.4mg/g。这种纳米级荧光探针可用于足够高响应的F离子检测和平台的去除。
Tremendous efforts have been dedicated to developing fluorescent probes with biocompatible and cyclic features. Challenges remain in terms of high toxicity, poor dispersity in aqueous solution, low efficiency, and high detection limit problems. Inspired by the low biotoxicity and high quantum yield of amine-modified carbon dots (NCDs) as well as the reversible binding between metal ions (Mn+ions) and carbon dots, a fluorescent quenching receptor is created based on the mechanism of nonradiative electron transfer from NCDs to Mn+ions. This fluorescent quenching receptor is coordinated on a mesoporous superparamagnetic Fe3O4@mSiO2nanoparticle, which forms a probe structure of Fe3O4@mSiO2-SiCDs@DTPA-Mn+/NCDs. NCDs detach from metal ions and recover their fluorescence when the probe is placed in the environment to be detected. The concentration of fluoride ions (F–ions) in the environment could be determined by the fluorescence intensity of the detached NCDs. This novel nanoscale probe has recyclable performance and can be reused at least 6 times. The minimum detection limit is down to 65 nM with a wide linear response range of 1 to 25 μM. The ion removal capacity could be up to 21.4 mg/g. This nanoscale fluorescent probe can be used for sufficiently high-response F–ion detection and removal of the platform.