A derivative photoelectrochemical sensing platform for 4-nitrophenolate contained organophosphates pesticide based on carboxylated perylene sensitized nano-TiO2
Autor: | Jing Li, Hongbo Li, Xiaoya Hu, Zhanjun Yang, Qin Xu |
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Rok vydání: | 2013 |
Předmět: |
Light
Scanning electron microscope Photoelectrochemistry Carboxylic Acids Analytical chemistry Metal Nanoparticles Methyl Parathion Biochemistry Gas Chromatography-Mass Spectrometry Analytical Chemistry Nitrophenols chemistry.chemical_compound Vegetables Environmental Chemistry Pesticides Fourier transform infrared spectroscopy Electrodes Perylene Spectroscopy Titanium Detection limit Electrochemical Techniques chemistry Titanium dioxide Selectivity Nuclear chemistry Visible spectrum |
Zdroj: | Analytica Chimica Acta. 766:47-52 |
ISSN: | 0003-2670 |
Popis: | A novel visible light sensitized photoelectrochemical sensing platform was constructed based on the perylene-3,4,9,10-tetracarboxylic acid/titanium dioxide (PTCA/TiO(2)) heterojunction as the photoelectric beacon. PTCA was synthesized via facile steps of hydrolysis and neutralization reaction, and then the PTCA/TiO(2) heterojunction was easily prepared by coating PTCA on nano-TiO(2) surface. 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 (0.08 nmol L(-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. |
Databáze: | OpenAIRE |
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