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首页> 外文期刊>Electroanalysis >A Novel Photoelectrochemical Sensor for Bisphenol A with High Sensitivity and Selectivity Based on Surface Molecularly Imprinted Polypyrrole Modified TiO_2 Nanotubes
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A Novel Photoelectrochemical Sensor for Bisphenol A with High Sensitivity and Selectivity Based on Surface Molecularly Imprinted Polypyrrole Modified TiO_2 Nanotubes

机译：基于表面分子印迹聚吡咯修饰的TiO_2纳米管的新型双酚A光电化学传感器

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摘要

A novel and simple photoelectrochemical (PEC) sensor is proposed to detect endocrine disruptor bisphenol A (BPA) based on vertically aligned TiO_2 nanotubes (TiO_2 NTs) with surface molecularly imprinted polypyrrole (PPy) for the first time. The developed PEC analytical method towards BPA successfully overcomes the high oxidation overvoltage required in sole electrochemical (EC) method, which may lead to electrochemical polymerization of BPA and accumulation of intermediate products and then bring the passivation of the electrode. Under a very low potential (50mV vs. SCE), a highly sensitive PEC response for BPA is obtained in the linear range from 4.5 to 108nM with a limit of detection (LOD) as low as 2.0nM. Simultaneously, by combining the surface molecularly imprinted polymer (MIP) technique with PEC method, specific recognition of BPA can be realized on the PEC sensor, even in coexisting systems containing 100-fold concentration of other substances with similar structures or chemical properties, such as hydroquinone, 1-naphthol or triphenylcarbino. The PEC sensor also presents good applicability and high stability in real water samples. The sensitive and selective recognition mechanisms are further discussed.
机译：提出了一种新颖，简单的光电化学传感器，用于首次基于垂直排列的TiO_2纳米管（TiO_2NTs）和表面分子印迹聚吡咯（PPy）检测内分泌干扰物双酚A（BPA）。针对双酚A的发达的PEC分析方法成功地克服了单一电化学（EC）方法所需的高氧化过电压，这可能导致双酚A的电化学聚合和中间产物的积累，从而使电极钝化。在极低的电势下（50mV vs. SCE），在4.5至108nM的线性范围内获得了对BPA的高灵敏度PEC响应，检测限（LOD）低至2.0nM。同时，通过将表面分子印迹聚合物（MIP）技术与PEC方法相结合，即使在含有100倍浓度的具有相似结构或化学性质的其他物质的共存系统中，也可以在PEC传感器上实现对BPA的特异性识别。对苯二酚，1-萘酚或三苯卡宾。 PEC传感器在真实水样中也具有良好的适用性和高稳定性。敏感和选择性识别机制将进一步讨论。

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