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首页> 外文期刊>RSC Advances >Preparation and characterization of a novel tetrakis(4-hydroxyphenyl) porphyrin-graphene oxide nanocomposite and application in an optical sensor and determination of mercury ions
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Preparation and characterization of a novel tetrakis(4-hydroxyphenyl) porphyrin-graphene oxide nanocomposite and application in an optical sensor and determination of mercury ions

机译：新型四（4-羟苯基）卟啉-氧化石墨烯纳米复合材料的制备，表征及其在光学传感器中的应用和汞离子的测定

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摘要

In this work, for the first time we report a highly specific and sensitive mercury ion (Hg2+) optical sensor (optode). The optode was prepared by recently synthesized nanocomposites, based on 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (THPP) and graphene oxide nanosheets. In this nanocomposite, porphyrin was stabilized on the graphene oxide nanosheets. X-ray diffraction (XRD), UV-vis spectroscopy, field-emission scanning electron microscopy (FE-SEM) and FT-IR were employed to characterize the prepared nanocomposite. In the prepared optical chemical sensor, the formation of a Hg2+- ionophore complex between the mercury ions and the membrane phase, changes the UV-vis absorbance of the sensor. To improve the sensor response, various experimental parameters such as pH, concentration of THPP and graphene oxide nanosheets in the prepared nanocomposite were optimized. This optode exhibited a linear range of 6.0 x 10(-9) to 6.0 x 10(-5) mol L-1 Hg(II) with a detection limit of 3.2 x 10(-9) mol L-1 and a response time of similar to 210 s. It manifests advantages of low detection limit, fast response time, wide dynamic range, good reversibility, high reproducibility and also remarkable selectivity regarding the number of transition metals ions (i.e. Pb2+, Cr3+, Zn2+, Cd2+, Cu2+, Fe2+, and Ni2+). This optode was applied for determining Hg(II) ions in water samples.
机译：在这项工作中，我们首次报告了一种高度特异性和灵敏的汞离子（Hg2 +）光学传感器（光电二极管）。通过基于5、10、15、20-四（4-羟苯基）卟啉（THPP）和氧化石墨烯纳米片的最近合成的纳米复合材料制备了该光电二极管。在该纳米复合材料中，卟啉被稳定在氧化石墨烯纳米片上。利用X射线衍射（XRD），紫外可见光谱，场发射扫描电子显微镜（FE-SEM）和傅立叶变换红外光谱（FT-IR）对制备的纳米复合材料进行表征。在制备的光学化学传感器中，汞离子与膜相之间形成Hg2 +-离子载体，改变了传感器的UV-vis吸光度。为了改善传感器响应，在制备的纳米复合材料中优化了各种实验参数，例如pH，THPP浓度和氧化石墨烯纳米片。该光电二极管的线性范围为6.0 x 10（-9）mol L-1 Hg（II），检测极限为3.2 x 10（-9）mol L-1和响应时间约210秒。它具有检测限低，响应时间快，动态范围广，可逆性好，可重复性高以及在过渡金属离子（即Pb2 +，Cr3 +，Zn2 +，Cd2 +，Cu2 +，Fe2 +和Ni2 +）数量上的显着选择性的优势。该光电二极管用于测定水样中的Hg（II）离子。

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