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A preparation method of phosphorescent quantum dots mn-zns and its application in iron speciation analysis

A quantum dot and phosphorescence technology, applied in the field of biological analysis and detection, to achieve the effect of eliminating the sample pretreatment process, easy storage, and economical detection

Inactive Publication Date: 2015-09-16
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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while Fe 3+ not with H 2 o 2 Fenton reaction

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  • A preparation method of phosphorescent quantum dots mn-zns and its application in iron speciation analysis
  • A preparation method of phosphorescent quantum dots mn-zns and its application in iron speciation analysis
  • A preparation method of phosphorescent quantum dots mn-zns and its application in iron speciation analysis

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Experimental program
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Embodiment 1

[0037] 1、 Synthesis of Mn-ZnS Phosphorescent Quantum Dots

[0038] MPA, Zn(CH 3 COOH) 2 and Mn (CH 3 COOH) 2 , where MPA:Zn (CH 3 COOH) 2 : Mn (CH 3 COOH) at a molar ratio of 2:1:0.04. The pH value of the solution was adjusted to 11 with NaOH, the above mixed solution was protected by nitrogen, stirred at room temperature for 30 min, and Na 2 S and Zn (CH 3 COOH) 2 The molar ratio is 1:1 to Na 2 The S solution was quickly injected into the solution, and continued to stir at room temperature for 20 min, then heated to 50 °C for 2 hours in the air with a constant temperature stirrer, added absolute ethanol, centrifuged, and vacuum-dried to obtain Mn-doped ZnS quantum dot products.

[0039] 2. Mn-doped ZnS quantum dot room temperature phosphorescence detection of iron ions in different valence states in solution

[0040] First, the preparation of Mn-doped ZnS quantum dot mother solution:

[0041] Weigh 1 mg of Mn-doped ZnS quantum dots and set the volume in a 100 mL...

Embodiment 2

[0054] 1、 Synthesis of Mn-ZnS Phosphorescent Quantum Dots

[0055] MPA, Zn(CH 3 COOH) 2 and Mn (CH 3 COOH) 2 , where MPA:Zn (CH 3 COOH) 2 : Mn (CH 3 COOH) at a molar ratio of 4:1:0.07. The pH value of the solution was adjusted to 11 with NaOH, the above mixed solution was protected by nitrogen, stirred at room temperature for 40 min, and Na 2 S and Zn (CH 3 COOH) 2 The molar ratio is 1:1 to Na 2 The S solution was quickly injected into the solution, continued to stir at room temperature for 30 min, and then heated to 60°C for 2 hours in the air with a constant temperature stirrer, added absolute ethanol, centrifuged, and vacuum-dried to obtain the Mn-doped ZnS quantum dot product.

[0056] 2. Mn-doped ZnS quantum dot room temperature phosphorescence detection of iron ions in different valence states in solution

[0057] First, the preparation of Mn-doped ZnS quantum dot mother solution:

[0058] Weigh 5 mg of Mn-doped ZnS quantum dots and set the volume in a 100 ...

Embodiment 3

[0071] 1、 Synthesis of Mn-ZnS Phosphorescent Quantum Dots

[0072] MPA, Zn(CH 3 COOH) 2 and Mn (CH 3 COOH) 2 , where MPA:Zn (CH 3 COOH) 2 : Mn (CH 3 COOH) at a molar ratio of 6:1:0.10. The pH value of the solution was adjusted to 11 with NaOH, the above mixed solution was protected by nitrogen, stirred at room temperature for 50 min, and Na 2 S and Zn (CH 3 COOH) 2 The molar ratio is 1:1 to Na 2 The S solution was quickly injected into the solution, and continued to stir at room temperature for 20 min, then heated to 70 °C for 2 hours in the air with a constant temperature stirrer, added absolute ethanol, centrifuged, and vacuum-dried to obtain Mn-doped ZnS quantum dot products.

[0073] 2. Mn-doped ZnS quantum dot room temperature phosphorescence detection of iron ions in different valence states in solution

[0074] First, the preparation of Mn-doped ZnS quantum dot mother solution:

[0075] Weigh 15 mg of Mn-doped ZnS quantum dots and set the volume in a 100 m...

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Abstract

The invention discloses a preparation method for phosphorescent quantum dots Mn-ZnS and a method for using phosphorescent quantum dots Mn-ZnS for detecting iron ions with different forms in a solution, aiming at selectively detecting the iron ions with different forms in the solution by virtue of phosphorescent changes at a room temperature. According to the method, a deoxidant and an inducer do not need to be added during detection for the iron ions with different forms in the solution, and the interferences of background fluorescence and scattered light can be avoided; meanwhile, a complex sample pre-treatment process is not needed during detection for the iron ions with different forms in the solution; and although quantum-dot fluorescence analysis method is already widely applied, attentions on the phosphorescent properties of quantum dots and the application thereof in analysis and detection are few. Therefore, the phosphorescent quantum dots Mn-ZnS prepared by the preparation method disclosed by the invention are good in water solubility and stability, and great in application prospect in the aspects of detection for a solution or water sample and the like.

Description

[0001] This patent is funded by the National Natural Science Foundation of China General Project 21375095, National Excellent Doctoral Dissertation Author Special Fund FANEDD-201023 and Tianjin Applied Basic Research Program Key Project 12JCZDJC21700. technical field [0002] The invention belongs to the technical field of biological analysis and detection, and relates to a method for preparing phosphorescent quantum dots Mn-ZnS and the application of aqueous phase synthesis of Mn-doped ZnS quantum dots to room temperature phosphorescence detection of different forms of iron ions in a solution. Background technique [0003] Quantum dots are mainly semiconductor nanoparticles composed of II-VI group elements or III-V group elements. Compared with organic fluorescent dyes, the photoluminescent properties of quantum dots are very superior, with long-range excitation, narrow and symmetrical emission peaks, high quantum yield, and not easy to photolyze. The fluorescent properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64C09K11/57G01N1/38
Inventor 李妍靳晴孙玉绣李晓云
Owner TIANJIN NORMAL UNIVERSITY
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