Rapid, simple and selective determination of 2,4,6-dinitrophenol based on PtAg /mesoporous SiO_2 nanocomposite sensor with electrochemical detection

摘要

5-10nmPt-Ag nanoparticles were synthesized by Water thermal reduction, pluronic F127 and tetraethyl Orthosilicate (TEOS) have been used to synthesized mesoporous SiO_2 template. Pt-Ag nanoparticles have been absorbed onto the surface of mesoporous SiO_2. Finally, PtAg/mesoporous SiO_2 nanocomposites have been modified on the surface of glass carbon electrode to prepared electrochemcial sensor which used to detect 2,4,6-dinitrophenol. In order to optimize experimental conditions, the synergistic reaction, buffer solution has been studied. The result show, when the potential at-0.404V, 2,4,6-dinitrophenol could be determined with a detection limit of 0.163μmol/L and linearity between 0.49-1667μmol/L . This sensor has high sensitivity, good reproducibility and stability.