title: A derivative photoelectrochemical sensing platform for 4-nitrophenolate contained organophosphates pesticide based on carboxylated perylene sensitized nano-TiO2.
abstract: 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.
authors: College of Chemistry and Engineering, Yangzhou University, 88 South University Avenue, Yangzhou 225002, PR China.
authors: Hongbo
authors: H
authors: Li
authors: Jing
authors: J
authors: Li
authors: Qin
authors: Q
authors: Xu
authors: Zhanjun
authors: Z
authors: Yang
authors: Xiaoya
authors: X
authors: Hu
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D008401:Gas Chromatography-Mass Spectrometry; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D008743:Methyl Parathion / Q000032:analysis; D009596:Nitrophenols / Q000737:chemistry*; D010569:Perylene / Q000031:analogs & derivatives* / Q000737:chemistry; D010575:Pesticides / Q000032:analysis*; D014025:Titanium / Q000737:chemistry*; D014675:Vegetables / Q000737:chemistry
chemical_list: C560550:3,4,9,10-perylene tetracarboxylic acid; D002264:Carboxylic Acids; D009596:Nitrophenols; D010575:Pesticides; C009495:titanium dioxide; D008743:Methyl Parathion; D010569:Perylene; D014025:Titanium; C024836:4-nitrophenol