Pyranine Immobilized on Aminopropyl-Modified Mesoporous Silica Film for Paraquat Detection

Pyranine Immobilized on Aminopropyl-Modified Mesoporous Silica Film for Paraquat Detection

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An optical sensor based on Frozen pyranine immobilized on aminopropyl-modified mesoporous silica films was developed for paraquat detection in aqueous solutions.An electrochemically assisted self-assembly method was used to deposit mesoporous silica film on fluorine-doped tin oxide glass.The obtained films were modified with various concentrations of 3-aminopropyl triethoxysilane (APTES) before the immobilization of pyranine.Cyclic voltammetry, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and fluorescence spectroscopy were used to characterize the films.

Pyranine-immobilized films gave an emission at 506 nm with an excitation at 450 nm.The fluorescence signal was quenched in the presence of paraquat.The films modified with 3% Refurbished Accessory APTES provided the optimum response to paraquat.The developed films had a linear response to paraquat in the concentration range of 1 to 10 ppm at the optimum conditions, with a detection limit of 0.

80 ppm.The developed method was used to quantify paraquat in sugarcane peel and tap water samples with satisfactory results.