A derivative photoelectrochemical sensing platform for 4-nitrophenolate contained organophosphates pesticide based on carboxylated perylene sensitized nano-TiO2.
A derivative photoelectrochemical sensing platform for 4-nitrophenolate contained organophosphates pesticide based on carboxylated perylene sensitized nano-TiO2.
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DOI：
10.1016/j.aca.2012.12.038
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发表时间：
2013-03
影响因子：
6.2
通讯作者：
Hongbo Li;Jing Li;Qin Xu;Zhanjun Yang;Xiaoya Hu
中科院分区：
文献类型：
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作者：
Hongbo Li;Jing Li;Qin Xu;Zhanjun Yang;Xiaoya Hu
以苝-3，4，9，10-四羧酸/二氧化钛（PTCA/TiO 2）异质结为光电信标，构建了一种新型可见光敏化光电化学传感平台。通过水解和中和反应合成了PTCA，并将其包覆在纳米TiO 2表面，制备了PTCA/TiO 2异质结。利用透射电子显微镜、扫描电子显微镜、X射线衍射仪、红外光谱仪、紫外可见分光光度计对所制备的光电信标进行了表征。以甲基对硫磷为模型，经过简单的水解过程，即可得到甲基对硫磷的水解产物对硝基苯酚，所制备的衍生物光电化学传感器表现出良好的性能，具有响应速度快、仪器简单便携、信噪比为3时检测限低（0.08nmolL-1），对其他农药和可能的干扰具有良好的选择性。该方法已成功地应用于绿色蔬菜中甲基对硫磷的检测，结果与GC-MS法一致。这一策略不仅拓展了PTCA的应用范围，而且为光电化学传感提供了一种简单、经济、新颖的方法。
A novel visible light sensitized photoelectrochemical sensing platform was constructed based on the perylene-3,4,9,10-tetracarboxylic acid/titanium dioxide (PTCA/TiO2) heterojunction as the photoelectric beacon. PTCA was synthesized via facile steps of hydrolysis and neutralization reaction, and then the PTCA/TiO2heterojunction was easily prepared by coating PTCA on nano-TiO2surface. The resulting photoelectric beacon was characterized by transmission electron microscope, scanning electron microscopy, X-ray diffractometry, FTIR spectroscopy, and ultraviolet and visible spectrophotometer. Using parathion-methyl as a model, after a simple hydrolyzation process, p-nitrophenol as the hydrolysate of parathion-methyl could be obtained, the fabricated derivative photoelectrochemical sensor showed good performances with a rapid response, instrument simple and portable, low detection limit (0.08nmolL−1) at a signal-to-noise ratio of 3, and good selectivity against other pesticides and possible interferences. It had been successfully applied to the detection of parathion-methyl in green vegetables and the results agreed well with that by GC–MS. This strategy not only extends the application of PTCA, but also presents a simple, economic and novel methodology for photoelectrochemical sensing.