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Preparation of gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with core-shell structure as well as product and application of quantum nanocomposite

A technology of gold nanoparticles and nanocomposites, which is applied in the field of preparation of gold nanoparticles@phosphorus and sulfur co-doped graphene quantum nanocomposites, can solve the problem of low reaction rate and yield, easy aggregation of nanoparticles, reduction of reducing agents It is easy to control the reaction conditions and the method is simple

Pending Publication Date: 2021-08-06
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the current problems in the preparation of AuNPs by traditional chemical reduction method and GQDs, such as easy aggregation of nanoparticles, low reducibility of reducing agent, low reaction rate and low yield, the purpose of the present invention is to provide a gold nanoparticle with a core-shell structure @Phosphorus-sulfur co-doped graphene quantum nanocomposites preparation method, specifically design a preparation method of phosphorus-sulfur co-doped graphene quantum dots stable gold nanoparticles with core-shell structure

Method used

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  • Preparation of gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with core-shell structure as well as product and application of quantum nanocomposite
  • Preparation of gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with core-shell structure as well as product and application of quantum nanocomposite
  • Preparation of gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with core-shell structure as well as product and application of quantum nanocomposite

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Embodiment 1

[0038]A gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with core-shell structure, using phosphorus-sulfur co-doped graphene quantum P,S-GQDs as reducing agent and stabilizer to reduce HAuCl 4 To prepare gold nanoparticles or gold nanoparticles@phosphorus and sulfur co-doped graphene quantum AuNPs@P,S-GQDs nanocomposites, the preparation is as follows:

[0039] Step 1: Perform electrochemical synthesis of P,S –GQDs:

[0040] Add 15 mL of 0.1 mol / L sodium phytate solution and 15 mL of 0.1 mol / L sodium p-toluenesulfonate solution to a 50 mL electrolytic cell, and mix thoroughly to prepare an electrolyte. Then graphite rods and parallel platinum foils (as working and counter electrodes, respectively) were inserted into the resulting mixed solution. Under the conditions of electrolysis voltage of 5 V and stirring rate of 150 rpm, the electrochemical reaction was carried out for 6 h, and then the obtained black suspension was filtered three times with a...

Embodiment 2

[0045] A gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with a core-shell structure is prepared according to the following steps:

[0046] Step 1: Perform electrochemical synthesis of P,S –GQDs: add 15 mL 0.1 mol / L sodium phytate solution and 15 mL 0.1 mol / L sodium p-toluenesulfonate solution to a 50 mL electrolytic cell, and mix thoroughly to prepare electrolyte. Then graphite rods and parallel platinum foils (as working and counter electrodes, respectively) were inserted into the resulting mixed solution. Under the conditions of electrolysis voltage of 5 V and stirring rate of 150 rpm, the electrochemical reaction was carried out for 6 h, and then the obtained black suspension was filtered three times with a 220 nm syringe filter, and then dialyzed with a 3500 Da dialysis bag for 48 h. Finally, it was freeze-dried at -53 ℃ for 5 days, and the obtained black particles were P,S-GQDs. The resulting P,S-GQDs were resuspended in water to form a 5 mg...

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Abstract

The invention provides a preparation method of a gold nanoparticle@phosphorus-sulfur co-doped graphene quantum (AuNPs@P, S-GQDs) nanocomposite with a core-shell structure and a product and application of nanocomposite. A mixed solution of sodium phytate and sodium p-toluenesulfonate is used as an electrolyte, and a working electrode graphite rod and a counter electrode parallel platinum foil are electrolyzed; filtering, dialyzing, freezing and drying are carried out to obtain phosphorus-sulfur co-doped graphene quantum (P, S-GQDs) for later use; a P, S-GQDs solution is heated and stirred, a HAuCl4 solution is added dropwise, centrifugal washing is carried out sequentially, and the obtained precipitate in water is re-suspended to obtain AuNPs@P, S-GQDs with the core-shell structure. The synthesized AuNPs@P, S-GQDs have relatively high sensitivity and selectivity on detection of heavy metal Hg (II) ions, and the adsorption removal rate of the AuNPs (at) P, S-GQDs on the Hg (II) ions reaches 95%; and after desorption and regeneration, the AuNPs@P and S-GQDs nano-composite can still be recycled.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to the preparation, product and application of a gold nanoparticle@phosphorus-sulfur co-doped graphene quantum nanocomposite with a core-shell structure. [0002] technical background [0003] With the improvement of people's living standards, people pay more and more attention to the pollution of heavy metals in food and the environment. In particular, heavy metal mercury is easy to accumulate and difficult to degrade, which is extremely harmful to the ecological environment and human body. Therefore, the detection of metal mercury and Dealing with issues gets a lot of attention. [0004] At present, the detection methods of mercury ions mainly include electrochemical method, flame atomic absorption method and fluorescence detection, etc. However, the electrochemical method and flame atomic absorption method have the disadvantages of expensive equipment, cumbersome operation, ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30G01N21/64G01N21/31
CPCB01J20/205B01J20/28021G01N21/6428G01N21/3103B01L3/00
Inventor 崔大祥彭家伟周诚梁辉
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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