The Synthesis of Eu3+ Doped with TiO2 Nano-Powder and Application as a Pesticide Sensor
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Using tetrabutyl titanate as precursor, Eu^(3+) doped TiO_2 nano-powder was prepared by sol-gel method, the nature of luminescence of nano-powder was studied. The interaction of chlorpyrifos with Eu^(3+) doped TiO_2 was studied by absorption and fluorescence spectroscopy. The results indicated the fluorescence intensity of Eu^(3+) doped TiO_2 was quenched by chlorpyrifos and the quenching rate constant (k_q) was 1.24×10^(11) L/mol·s according to the Stern-Volmer equation. The dynamics of photoinduced electron transfer from chlorpyrifos to conduction band of TiO_2 nanoparticle was observed and the mechanism of electron transfer had been confirmed by the calculation of free energy change (ΔG_(et)) by applying Rehm-Weller equation as well as energy level diagram. A new rapid method for detection of chlorpyrifos was established according to the fluorescence intensity of Eu^(3+) doped TiO_2 was proportional to chlorpyrifos concentration. The range of detection was 5.0×10^(-10) -2.5×10^(-7)mol/L and the detection limit (3σ) was 3.2×10^(-11) mol/L.
Abstract
Using tetrabutyl titanate as precursor, Eu^(3+) doped TiO_2 nano-powder was prepared by sol-gel method, the nature of luminescence of nano-powder was studied. The interaction of chlorpyrifos with Eu^(3+) doped TiO_2 was studied by absorption and fluorescence spectroscopy. The results indicated the fluorescence intensity of Eu^(3+) doped TiO_2 was quenched by chlorpyrifos and the quenching rate constant (k_q) was 1.24×10^(11) L/mol·s according to the Stern-Volmer equation. The dynamics of photoinduced electron transfer from chlorpyrifos to conduction band of TiO_2 nanoparticle was observed and the mechanism of electron transfer had been confirmed by the calculation of free energy change (ΔG_(et)) by applying Rehm-Weller equation as well as energy level diagram. A new rapid method for detection of chlorpyrifos was established according to the fluorescence intensity of Eu^(3+) doped TiO_2 was proportional to chlorpyrifos concentration. The range of detection was 5.0×10^(-10) -2.5×10^(-7)mol/L and the detection limit (3σ) was 3.2×10^(-11) mol/L.
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