化工进展 ›› 2012, Vol. 31 ›› Issue (02 ): 417-420.

• 精细化工 • 上一篇    下一篇

Eu3+掺杂TiO2荧光探针的制备及对氯氰菊酯的检测应用

姚  飞,谭春雷,王文霞,张小娟,卢  荣   

  1. (西北大学化工学院,陕西 西安 710069)
  • 出版日期:2012-02-05 发布日期:2012-02-25

Preparation of Eu3+ doped with TiO2 fluorescent probe and its applicationon the detection ofcypermethrin

YAO Fei,TAN Chunlei,WANG Wenxia,ZHANG Xiaojuan,LU Rong   

  1. (College of Chemical Engineering,Northwestern University,Xi'an710069,Shaanxi,China)
  • Online:2012-02-05 Published:2012-02-25

摘要: 以钛酸四丁酯为前体,采用液相法制备了水溶态纳米Eu3+掺杂TiO2荧光探针,并对其发光性质进行了研究。通过紫外吸收和荧光光谱研究了它和氯氰菊酯之间的相互作用,结果发现,氯氰菊酯对Eu3+掺杂TiO2的荧光具有猝灭作用,根据Stern-Volmer猝灭方程,计算出其猝灭常数为1.017×1011 L/(mol·s),并讨论了猝灭机理。依据氯氰菊酯浓度和Eu3+掺杂TiO2的荧光强度成正比,建立了一种快速检测农药的新方法。其检测范围为2.5×10-10~2.5×10-7mol/L,检出限为2.5×10-11mol/L,回收率在89.25%~93.55%之间。

关键词: 二氧化钛, 荧光光谱, 氯氰菊酯, 荧光猝灭

Abstract: Using tetrabutyl titanate as a precursor,the nanometer Eu3+ doped TiO2 was prepared by sol-gel method,and the property of luminescence of nano-powder was studied. The interaction of cypermethrin with Eu3+-TiO2 was studied by absorption and fluorescence spectroscopy. The results indicated that the fluorescence intensity of Eu3+-TiO2 was quenched by cypermethrin and the quenching rate constant(kq)was 1.017×1011 L/(mol·s) according to the Stern-Volmer equation,and the mechanism of quench had been discussed. Anewrapid method for detection ofpesticides was established according to that the fluorescence intensity of Eu3+-TiO2 was proportional to cypermethrin concentration. The range of detection was 2.5×10-10—2.5×10-7 mol/L,the detection limit(3σ)was 2.5×10-11 mol/L and the recovery was 89.25%—93.55%.

Key words: TiO2, fluorescence, cypermethrin, fluorescence quenching