Ultrasensitive and rapid lead sensing in water based on environmental friendly and high luminescent L-glutathione-capped-ZnSe quantum dots.
Water-soluble and high luminescent l-glutathione-capped-ZnSe quantum dots (QDs) were applied for ultrasensitive Pb(II) detection. l-glutathione-capped-ZnSe QDs were synthesized by a facile colloid aqueous phase route. It is characterized by transmission electron microscopy, X-ray powder diffraction spectrometry, Fourier transform infrared spectrometry, Ultraviolet-visible spectrometry and fluorescence spectrometry. Quantum yields of l-glutathione-capped-ZnSe QDs could reach 50.1% without post irradiation. The fluorescence quenching of the l-glutathione-capped-ZnSe QDs depended on the concentration, pH and reaction time of the Pb(II) solution. The possible mechanism of fluorescence of l-glutathione-capped-ZnSe QDs quenched by Pb(II) was discussed in detail. Under optimal conditions, the quenched fluorescence intensity increased linearly with the concentration of Pb(II) in the range of 1.0×10(-8)∼8.0×10(-7)mol/L. The limit of detection for Pb(II) was 0.71 nmol/L. This developed method is demonstrated to contain improved sensitive and selective characteristics for the detection of trace Pb(II) in water.
National R&D Center for Egg Processing, Key Laboratory of Environment Correlative Dietology, (Ministry of Education) Food Science and Technology College, Huazhong Agricultural University, 1 Shizishan Street, Wuhan, Hubei 430070, China. caizhaoxia@mail.hzau.edu.cn
Zhaoxia
Z
Cai
Baoqin
B
Shi
Lei
L
Zhao
Meihu
M
Ma
D002138:Calibration; D005978:Glutathione / Q000737:chemistry*; D055772:Green Chemistry Technology / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection; D049449:Luminescence; D046529:Microscopy, Electron, Transmission; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
D018036:Selenium Compounds; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds; D014867:Water; D007854:Lead; D005978:Glutathione; C044696:zinc selenide