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Method for detecting Cd<2+> and Pb<2+> ions through fluorescent molecular modified silver sol

A technology of fluorescent molecules and silver sol, which is applied in the field of nanomaterials, can solve the problems of high cost and long time consumption, and achieve the effects of low detection limit, simple preparation method and convenient use

Inactive Publication Date: 2017-09-22
YANGZHOU UNIV
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Problems solved by technology

[0004] The invention discloses a method of using lysine-modified perylene diimide functionalized silver nanoparticles (LPL-AgNPs) as a qualitative detection method for Cd 2+、 Pb 2+ A new visual detection reagent method for ions, which solves the problems of long time-consuming and high cost of traditional detection methods

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  • Method for detecting Cd&lt;2+&gt; and Pb&lt;2+&gt; ions through fluorescent molecular modified silver sol
  • Method for detecting Cd&lt;2+&gt; and Pb&lt;2+&gt; ions through fluorescent molecular modified silver sol

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Embodiment 1

[0023] (1) Preparation of amino acid-modified perylene diimide functionalized silver nano-solution (LPL-AgNPs) at pH=11: pipette 16mL of the above solution (7.5μM) at pH=11, add 0.01M silver nitrate 0.1mL , stirred for 5 min, then added 0.1 mL of 0.10M sodium borohydride, and stirred for 1 min.

[0024] (2) Detection of different metal ions by lysine-modified perylenediimide functionalized silver nanoparticles with pH=11: adding Cr respectively to the prepared LP-AgNPs 2 o 7 2- , Mn 2+ 、Cd 2+ , Pb 2+ 、Ba 2+ 、Al 3+ , Zn 2+ , Ca 2+ 、Na + 、K + solution, and make the final concentration of metal ions 10μM, after 5min, it can be seen that the addition of Cd 2+ The color of LPL-AgNPs changed obviously, from yellow to dark yellow. Observe the color change of the LPL-AgNPs solution.

[0025] (3) Lysine-modified perylenediimide functionalized nano-silver solution at pH = 10 has different concentrations of Cd 2+ Detection of ions: add Cd to the prepared LPL-AgNPs solution ...

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Abstract

The invention relates to a method for detecting Cd<2+> and Pb<2+> ions through fluorescent molecular modified silver sol. The method comprises the following steps of preparing a perylene diimide solution modified by lysine; preparing perylene diimide functional silver (LPL-AgNPs) nanometer particles modified by lysine; adding silver nitrate into the perylene diimide modified by the lysine; in a stirring process, adding sodium borohydride; continuously stirring; detecting Cd<2+> and Pb<2+> ions; adding a heavy metal ion solution into prepared LPL-AgNPs; observing the color change of the LPL-AgNPs solution. The preparation method has the advantages that the method is simple; the use is convenient; the detection limit is low; the problems of long time consumption and high cost of a conventional detection measure are solved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for detecting Cd through silver sol modified by fluorescent molecules. 2+、 Pb 2+ ionic method. Background technique [0002] Nanomaterials have always been the focus of scientists' attention because of their many unique properties, such as surface and interface effects, small size effects, tunneling effects, and quantum size effects. Also because of these unique properties, nanomaterials are widely used in many fields. [0003] In recent years, the use of metal nanoparticles as a visual detection method for heavy metal ions has been intensively studied. Metal nanoparticle sols with specific detection for different metal ions can be obtained after functionalization of different molecules. Compared with the traditional instrumental analysis method, this kind of method is simpler, cheaper, faster and more convenient. In the present invention, a perylene diimide m...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/775
Inventor 孙燕王佳丽左同飞刁国旺
Owner YANGZHOU UNIV