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Polydopamine-metal ion composite nanoparticles and its preparation method and application

A technology of composite nanoparticles and polydopamine, which is applied in the field of electrochemical signals and can be distinguished, can solve the problems of complicated separation and purification steps, difficult simultaneous detection of multiple components, etc., and achieve the effect of simple method

Inactive Publication Date: 2018-11-06
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, small organic molecules are used as electrical signal substances because they have fewer types, and most of the redox peak potentials are close to each other and interfere with each other. It is not easy to realize the simultaneous detection of multiple components, and the preparation of organic polymer probes requires precise control of experimental conditions. Guaranteed to obtain materials with uniform morphology and properties, and the separation and purification steps are relatively complicated

Method used

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  • Polydopamine-metal ion composite nanoparticles and its preparation method and application
  • Polydopamine-metal ion composite nanoparticles and its preparation method and application
  • Polydopamine-metal ion composite nanoparticles and its preparation method and application

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Effect test

Embodiment 1

[0028] 1. The preparation method of polydopamine composite particles is as follows: dissolve 90 mg of dopamine in 50 mL of water, add 380 μL of 1M NaOH aqueous solution, and react at 50° C. for 5 h. Centrifuge, wash until the upper solution is colorless and transparent, centrifuge to obtain the bottom PDA nanoparticles, and then disperse into 25mL deionized water. Then take a certain amount of PDA solution, and a certain amount of metal ions (Cd 2+ 、Cu 2+ , Pb 2+ , Zn 2+ , Hg 2+ ) solutions are mixed, the pH of the solution is adjusted, and after stirring for a certain period of time, the composite nanoparticles of polydopamine-metal ions are centrifuged.

[0029] 2. PDA adsorbs Cd 2+ The method is as follows: take 5mL of PDA solution, and 5mL of 100mM Cd(CH 3 COO) 2 Aqueous solutions are mixed. Stir vigorously at room temperature for more than 8 hours, centrifuge, and wash with deionized water for more than 3 times.

[0030] 3. PDA adsorbs Cu 2+ The method is as fol...

Embodiment 2

[0035] 1. The preparation method of PDA composite particles is as follows: dissolve 90 mg of dopamine in 50 mL of water, add 380 μL of 1M NaOH aqueous solution, and react at 50° C. for 6 h. Centrifuge, wash until the upper solution is colorless and transparent, centrifuge to obtain the PDA nanoparticles at the bottom, and then disperse them in 25 mL of deionized water. Then take a certain amount of PDA solution, and a certain amount of metal ions (Cd 2+ 、Cu 2+ , Pb 2+ , Zn 2+ , Hg 2+ ) solutions are mixed, the pH of the solution is adjusted, and after stirring for a certain period of time, the composite nanoparticles of polydopamine-metal ions are centrifuged.

[0036] 2. PDA adsorbs Cd 2+ The method is as follows: take 5mL of PDA solution, and 5mL of 10mM Cd(CH 3 COO) 2 Aqueous solutions are mixed. Stir vigorously at room temperature for more than 8 hours, centrifuge, and wash with deionized water for more than 3 times.

[0037] 3. PDA adsorbs Cu 2+ The method is as...

Embodiment 3

[0042] 1. The preparation method of PDA composite particles is as follows: dissolve 90 mg of dopamine in 50 mL of water, add 380 μL of 1M NaOH aqueous solution, and react at 50° C. for 5 h. Centrifuge, wash until the upper solution is colorless and transparent, centrifuge to obtain the PDA nanoparticles at the bottom, and then disperse them in 25 mL of deionized water. Then take a certain amount of PDA solution, and a certain amount of metal ions (Cd 2+ 、Cu 2+ , Pb 2+ , Zn 2+ , Hg 2+ ) solutions are mixed, the pH of the solution is adjusted, and after stirring for a certain period of time, the composite nanoparticles of polydopamine-metal ions are centrifuged.

[0043] 2. PDA adsorbs Cd 2+ The method is as follows: take 5mL of PDA solution, and 5mL of 100mM Cd(CH 3 COO) 2 Aqueous solutions are mixed. Stir vigorously at room temperature, add 1 mL of 0.01M CH 3 COOH aqueous solution, and continuously stirred for more than 8 hours, centrifuged, and washed with deionized ...

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Abstract

The invention discloses poly-dopamine-metal ion compound nanoparticles, a preparation method and application thereof. The preparation method comprises the following steps: under an alkaline condition, oxidizing a dopamine monomer to prepare poly-dopamine nanoparticles by using oxygen in the air; afterwards, adsorbing Pb<2+>, Zn<2+>, Cu<2+>, Cd<2+> and Hg<2+> to prepare novel electroconductive compound nanoparticles with electrochemical activity. According to the nanocomposite, the preparation method is simple, the preparation condition is mild and easy to control, and the preparation process is simple and quick; the compound nanoparticles obtained through using the poly-dopamine nanoparticles to respectively adsorb the five metal ions has a single and differentiable electrochemical signal, and has an extensive application prospect in the fields of electrochemical detection and analysis.

Description

technical field [0001] The present invention relates to the preparation of PDA nanoparticles and their use to adsorb Pb separately 2+ , Zn 2+ 、Cu 2+ 、Cd 2+ and Hg 2+ As a novel electrochemically active nanoparticle and its preparation method, the composite nanomaterial has electrochemical activity, can generate a single and distinguishable electrochemical signal, has good conductivity, and can be used for electrochemical detection of water, urine, serum, Analytical objects in the atmosphere. The invention belongs to the field of electrochemistry and can be used for electrochemical analysis and detection. Background technique [0002] Electrical signal substances with electrochemical redox activity play an important role in the field of simultaneous electrochemical analysis and detection of multiple components. Common types of electrochemical analysis detection include voltage type, current type, electrochemiluminescence and resistance type. Compared with other types o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26B82Y30/00B82Y40/00B82Y15/00
Inventor 马占芳唐忠雪
Owner CAPITAL NORMAL UNIVERSITY
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