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A hybrid magnetic core–shell fibrous silica nanocomposite for a chemosensor-based highly effective fluorescent detection of Cu(II)

机译:杂化核-壳纤维二氧化硅纳米复合材料,用于基于化学传感器的Cu(II)高效荧光检测

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Herein, a novel hybrid magnetic core–shell fibrous silica nanocomposite (RhB–Fe3O4/MnO2/SiO2/KCC-1) probe-based chemosensor was designed and its behaviour towards Cu(II) metal ion was investigated using a fluorescence spectrometer. The organic receptor rhodamine B (RhB) fluorophore derivative was covalently grafted onto the surface of the magnetic core–shell fibrous silica nanocomposite. This sensing probe achieved the selectivity towards Cu(II) in an aqueous solution, and other competing metal ions basically induced no spectral change. Thus, this sensing probe can work as a Cu(II) selective fluorescent sensor. The synthesized material was characterized using transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), surface analysis (with BET), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry, and thermogravimetric analysis (TGA). The rhodamine B derivative has a unique signalling probe that exhibits a turn-on fluorescence enhancement upon the recognition of Cu(II) ion with an excitation at 569 nm. The linearity of the Stern–Volmer plot (R2 = 0.9882) and the detection limit of 12.3 × 10?8 M were achieved. Finally, the sensor was tested to detect Cu(II) ion in different real water samples.
机译:在这里,一种新型的混合磁核-壳纤维状二氧化硅纳米复合材料(RhB–Fe 3 O 4 / MnO <设计了基于small> 2 / SiO 2 / KCC-1)的化学传感器,其对Cu( II )金属离子使用荧光光谱仪进行了研究。有机受体若丹明B(RhB)荧光团衍生物被共价接枝到磁性核-壳纤维状二氧化硅纳米复合材料的表面上。该传感探针在水溶液中对Cu( II )具有选择性,其他竞争性金属离子基本上不会引起光谱变化。因此,该传感探针可以用作Cu( II )选择性荧光传感器。使用透射电子显微镜(TEM),扫描电子显微镜-能量色散光谱(SEM-EDS),表面分析(BET),傅立叶变换红外光谱(FT-IR),X射线衍射和热重分析对合成材料进行表征分析(TGA)。罗丹明B衍生物具有独特的信号探针,在569 nm激发下识别Cu( II )离子后,其荧光显示增强。 Stern-Volmer图的线性度( R 2 = 0.9882)和检测限为12.3×10 ?达到了8 。最后,对传感器进行测试以检测不同真实水样中的Cu( II )离子。

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