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Efficient Optical and UV–Vis Chemosensor Basedon Chromo Probes–PolymericNanocomposite Hybrid for Selective Recognition of Fluoride Ions

机译:基于高效的光学和紫外可见化学传感器色探针上的聚合纳米复合杂化物对氟离子的选择性识别

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摘要

A novel colorimetric sensor based on the TiO2/poly(acrylamide-co-methylene bis acrylamide-co-2-(3-(4-nitro-phenyl)thioureido)ethyl methacrylate) nanocomposite was synthesized via a surface modification strategy; methacryloxypropyltrimethoxysilane was used to provide reactive vinyl groups on the surface of TiO2 nanoparticles for the successful surface polymerization of Am (acrylamide), MBA (methylenbisacrylamide), and NPhM (2-(3-(4-nitrophenyl)thioureido)ethyl methacrylate) components. The successful preparation of nanocomposites was confirmed using Fourier transform infrared, 1H NMR, 13C NMR, scanning electron microscopy, transmission electron microscopy, thermogravimetry analysis, and X-ray diffraction methods, and the sensing ability of the probe toward fluoride ions was investigated using naked-eye detection and UV–vis measurement. The interaction of the prepared polymeric nanocomposite with fluoride ions elicited a significant visible change in color from pale yellow to orange and was further affirmed by a clean interconversion of the two absorption bands at 330 and 485 nm. The selective binding ability of the polymeric nanocomposite towardsfluoride over other anions, such as I, Cl, Br, AcO, H2PO4, and H2SO4 was further explored; the prepared chemosensor could detect fluorideions in acetonitrile with a detection limit of 3 μM.
机译:通过表面修饰策略合成了一种新型的比色传感器,该传感器基于TiO2 /聚(丙烯酰胺-共-亚甲基双丙烯酰胺-共-2-(3-(4-硝基-苯基)硫脲基)乙基甲基丙烯酸乙酯)纳米复合材料。甲基丙烯酰氧基丙基三甲氧基硅烷用于在TiO2纳米颗粒的表面上提供活性乙烯基,以成功地进行Am(丙烯酰胺),MBA(亚甲基双丙烯酰胺)和NPhM(2-(3-(4-(硝基苯)硫脲基)甲基丙烯酸乙酯)组分的表面聚合。使用傅立叶变换红外光谱, 1 H NMR, 13 C NMR,扫描电子显微镜,透射电子显微镜,热重分析和X射线衍射证实了纳米复合材料的成功制备方法,并使用肉眼检测和UV-vis测量研究了探针对氟离子的传感能力。所制备的聚合物纳米复合材料与氟离子的相互作用引起了从浅黄色到橙色的明显可见颜色变化,并且通过在330和485 nm处两个吸收带的清晰互变进一步证实了这一点。聚合物纳米复合材料对的选择性结合能力氟化物比其他阴离子,例如I ,Cl ,Br ,AcO ,H2PO4 和H2SO4 进行了进一步探索;准备好的化学传感器可以检测氟化物乙腈中的离子,检测限为3μM。

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