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Cathodic photoelectrochemical detection of PCB101 in environmental samples with high sensitivity and selectivity

机译:高灵敏度和高选择性阴极光电化学检测环境样品中的PCB101

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A novel cathodic photoelectrochemical (PEC) sensing method was developed for fast and convenient detection of PCB101 taking advantages of the excellent PEC reducibility of Pd quantum dots (QDs) modified molecularly imprinted TiO2 nanorods (NRs). Attributed to the efficient PEC reduction of PCB101 on the cathode surface, sensitive cathodic photocurrent would be produced with increasing PCB101 concentration under a negative bias potential, giving a low PCB101 detection limit of 5 x 10(-14) mol L-1. Meanwhile, molecular imprinting (MI) technique was integrated by in situ introduction of MI sites on the surface of TiO2 NRs, so that highly specific adsorption and reduction of PCB101 congener could be obtained. The results indicated that the PEC sensor presented excellent selectivity toward PCB101 with the coexistance of 100-fold excess of other pollutants including the PCBs congeners, other aromatic pollutants, and heavy metal ions. The cathodic PEC sensor was sucessfully applied in determination of PCB101 in real water and soil samples, and the results had good consistency with that obtained by the traditional GC-MS. This work provides a new concept and research basis for fabricating cathodic PEC sensor for the environmental pollutants with specific structures that were easily reduced. (C) 2017 Elsevier B.V. All rights reserved.
机译:利用Pd量子点(QDs)修饰的分子印迹TiO2纳米棒(NRs)的优异PEC可还原性,开发了一种新颖的阴极光电化学(PEC)传感方法,用于快速方便地检测PCB101。归因于阴极表面上PCB101的有效PEC还原,在负偏置电位下,随着PCB101浓度的增加,将产生灵敏的阴极光电流,使PCB101的检测限低至5 x 10(-14)mol L-1。同时,通过在TiO2 NRs表面原位引入MI位点来整合分子印迹(MI)技术,从而可以获得高度特异性的吸附和还原PCB101同类物。结果表明,PEC传感器对PCB101表现出优异的选择性,并与其他污染物共存100倍,其中包括PCBs同系物,其他芳香族污染物和重金属离子。成功地将阴极PEC传感器用于实际水和土壤样品中PCB101的测定,结果与传统GC-MS的结果具有良好的一致性。这项工作为制造具有易于还原的特定结构的环境污染物的阴极PEC传感器提供了新的概念和研究基础。 (C)2017 Elsevier B.V.保留所有权利。

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