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Method for detecting heavy metal ions based on fluorescent perovskite nanocrystals

A technology of heavy metal ions and nanocrystals, applied in fluorescence/phosphorescence, preparation of test samples, measurement devices, etc., can solve problems such as inability to detect heavy metal ions, and achieve the effects of poor water corrosion resistance, mild conditions, and simple and convenient operation.

Inactive Publication Date: 2020-02-28
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for detecting heavy metal ions based on fluorescent perovskite nanocrystals, which has mild conditions, simple and convenient operation, and overcomes the CsPbBr 3 The problem of inability to detect heavy metal ions in aqueous solution broadens the scope of CsPbBr 3 scope of application

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  • Method for detecting heavy metal ions based on fluorescent perovskite nanocrystals
  • Method for detecting heavy metal ions based on fluorescent perovskite nanocrystals

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Embodiment 1

[0033] This embodiment provides a method based on fluorescent perovskite nanocrystals to detect Ag in aqueous solution. + methods, including:

[0034] S1. Weigh 0.1 g CsPbBr 3 Nanocrystals were placed in a 50 mL centrifuge tube, and 30 mL of dichloromethane was added to obtain a detection reagent.

[0035] S2. Add 2 mL ultrapure water to a 5 mL centrifuge tube, then add 2 µL, 10 mmol / L Ag + aqueous solution to obtain the solution to be tested.

[0036] S3. Mix the solution to be tested prepared in S2 with 2 mL of detection reagent, oscillate fully, let stand for 1 min, remove the lower organic phase and measure its fluorescence emission spectrum.

Embodiment 2

[0038] This embodiment provides a method based on fluorescent perovskite nanocrystals to detect Cd in aqueous solution 2+ methods, including:

[0039] S1. Weigh 0.1 g CsPbBr 3 Nanocrystals were placed in a 50 mL centrifuge tube, and 30 mL of dichloromethane was added to obtain a detection reagent.

[0040] S2. Add 2 mL of ultrapure water to a 5 mL centrifuge tube, then add 2 µL of 10 mmol / L Cd 2+ aqueous solution to obtain the solution to be tested.

[0041] S3. Mix the solution to be tested prepared in S2 with 2 mL of detection reagent, oscillate fully, let stand for 1 min, remove the lower organic phase and measure its fluorescence emission spectrum.

Embodiment 3

[0043] This embodiment provides a method for detecting Co in aqueous solution based on fluorescent perovskite nanocrystals. 2+ methods, including:

[0044] S1. Weigh 0.1 g CsPbBr 3 Nanocrystals were placed in a 50 mL centrifuge tube, and 30 mL of dichloromethane was added to obtain a detection reagent.

[0045] S2. Add 2 mL of ultrapure water to a 5 mL centrifuge tube, then add 2 µL of 10 mmol / L Co 2+ aqueous solution to obtain the solution to be tested.

[0046] S3. Mix the solution to be tested prepared in S2 with 2 mL of detection reagent, oscillate fully, let stand for 1 min, remove the lower organic phase and measure its fluorescence emission spectrum.

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Abstract

The invention discloses a method for detecting heavy metal ions based on fluorescent perovskite nanocrystals, and relates to the field of heavy metal ion detection. The method comprises the steps thata liquid-liquid extraction method is used, an organic solution of CsPbBr3 is used to extract an aqueous solution of heavy metal ions, and the heavy metal ions are extracted to an organic phase for detection. Because CsPbBr3 is not in direct contact with a water phase, fluorescence quenching of CsPbBr3 is not caused. Therefore, the problems of poor water erosion resistance and limited applicationin an aqueous solution of CsPbBr3 are well solved. The method is mild in conditions, simple and convenient to operate, high in sensitivity, and capable of realizing the qualitative detection of heavymetal ions in aqueous solution.

Description

technical field [0001] The invention relates to the field of detection of heavy metal ions, in particular to a method for detecting heavy metal ions based on fluorescent perovskite nanocrystals. Background technique [0002] Perovskite originally refers to the yellow, brown or black inorganic mineral perovskite (CaTiO) discovered in the Ural Mountains of Russia and named after the Russian mineralogist Lev Perovski. 3 ), now refers to a broad class of materials with the same structure. Metal halide perovskites are characterized by the chemical formula ABX 3 , including organic-inorganic halide perovskites, organic halide perovskites CH 3 NH 3 wxya 3 (X=Cl,Br,I) and all-inorganic halide perovskites, CsPbX 3 , In the past few years, all-inorganic halide perovskite nanocrystals have attracted extensive attention due to their excellent optical and optoelectronic properties, becoming a new star in the field of nanomaterials. At the same time, perovskite has attracted more at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N1/40
CPCG01N1/4055G01N21/643G01N2001/4061
Inventor 凌剑王俊胡怡琳刘安勇文秋林吴必超
Owner YUNNAN UNIV
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