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CN-121988735-A - Single precious metal nanoparticle coated ZIF-8 composite nanomaterial and preparation method and application thereof

CN121988735ACN 121988735 ACN121988735 ACN 121988735ACN-121988735-A

Abstract

The application relates to a single precious metal nanoparticle externally coated ZIF-8 composite nanomaterial and a preparation method and application thereof, and belongs to the technical field of precious metal nanoparticle synthesis. The preparation method of the single noble metal nanoparticle coated ZIF-8 composite nanomaterial comprises the following steps of firstly dissolving noble metal nanoparticles and a surfactant in a solvent, adding a zinc salt solution under magnetic stirring, stirring at room temperature, centrifuging to remove supernatant, dispersing precipitate in the solvent, injecting a dimethyl imidazole solution, standing for reaction, and obtaining the single noble metal nanoparticle coated ZIF-8 composite nanomaterial. According to the application, the nucleation reaction of ZIF-8 is limited on the surface of the nano-particles by utilizing the van der Waals attraction between the surfactant polyvinylpyrrolidone and the noble metal nano-particles and the electrostatic attraction between the polyvinylpyrrolidone and zinc ions, so that the shell-core structure of the single noble metal nano-particles coated with ZIF-8 is finally obtained, and the preparation method is convenient and simple.

Inventors

  • TIAN XINLONG
  • CHEN MINGYANG
  • SHI XIAODONG
  • Xing Zhenyue
  • LIANG XIAOXIAO
  • CHEN WEN

Assignees

  • 海南大学

Dates

Publication Date
20260508
Application Date
20260127

Claims (10)

  1. 1. The preparation method of the single noble metal nanoparticle coated ZIF-8 composite nanomaterial is characterized by comprising the following steps of: firstly, noble metal nano-particles and a surfactant are dissolved in a solvent, zinc salt solution is added under magnetic stirring, stirring is carried out at room temperature, then supernatant is removed by centrifugation, precipitate is dispersed in the solvent, dimethyl imidazole solution is injected, standing is carried out for reaction, and the single noble metal nano-particle coated ZIF-8 composite nano-material is obtained.
  2. 2. The method for preparing the single noble metal nanoparticle overcladding ZIF-8 composite nanomaterial as claimed in claim 1, wherein the surfactant is polyvinylpyrrolidone.
  3. 3. The preparation method of the single noble metal nanoparticle coated ZIF-8 composite nanomaterial according to claim 2, wherein the average molar mass of polyvinylpyrrolidone is at least one selected from 10000-360000 g/mol.
  4. 4. The preparation method of the single noble metal nanoparticle coated ZIF-8 composite nanomaterial according to claim 1, wherein the molar concentration of the zinc salt solution is 1.0-10.0 mol L -1 , and the zinc salt is at least one selected from zinc nitrate, zinc sulfate, zinc acetate, zinc chloride, zinc perchlorate, zinc tetrafluoroborate, zinc trifluoromethane sulfonate and bis (trifluoromethane sulfonyl) imide zinc.
  5. 5. The method for preparing the single precious metal nanoparticle overcladding ZIF-8 composite nanomaterial as claimed in claim 1, wherein the stirring time is 2 hours.
  6. 6. The method for preparing the single precious metal nanoparticle overcoated ZIF-8 composite nanomaterial according to claim 1, wherein the reaction time is 4 hours.
  7. 7. The method for preparing the single noble metal nanoparticle overcladding ZIF-8 composite nanomaterial as claimed in claim 1, wherein the solvent is a methanol solution.
  8. 8. The preparation method of the single noble metal nanoparticle coated ZIF-8 composite nanomaterial according to claim 1, wherein the molar concentration of the dimethylimidazole solution is 0.1-1 mol L -1 .
  9. 9. The single precious metal nanoparticle overcoated ZIF-8 composite nanomaterial characterized in that the single precious metal nanoparticle overcoated ZIF-8 composite nanomaterial prepared by the method of any one of claims 1-8.
  10. 10. Use of the single noble metal nanoparticle overcladding ZIF-8 composite nanomaterial of claim 9 in the fields of sensing and catalysis.

Description

Single precious metal nanoparticle coated ZIF-8 composite nanomaterial and preparation method and application thereof Technical Field The application relates to the technical field of noble metal nanoparticle synthesis, in particular to a single noble metal nanoparticle coated ZIF-8 composite nanomaterial, and a preparation method and application thereof. Background Noble metal nanoparticles have unique optical and catalytic properties, while Metal Organic Frameworks (MOFs) have ultra-large specific surface areas, adjustable crystal pores, and unique chemical properties, which have many applications in the fields of catalysis, gas storage/separation, drug delivery, and chemical sensing, and so on, the combination of the two to form hybrid nanostructures has received increasing attention in recent years. Noble metal nano particles with different shapes, which are obtained by different preparation processes, are coated in the porous MOF, so that the stability and the selectivity in the application fields of sensing, catalysis and the like can be remarkably improved. The noble metal nano particles are mixed with the MOF material to prepare the novel multifunctional material. Therefore, several subject groups have proposed various methods for encapsulating noble metal nanoparticles in MOFs, including calcination, surface deposition, gas phase infiltration. However, these methods lack precise control over the shape size, number of distributions, and arrangement composition of nanoparticles. At present, few reports are directed to encapsulating individual noble metal nanoparticles in MOF crystals, forming a shell-core structure of individual noble metal nanoparticles @ MOF. The application discloses a general preparation method for coating single noble metal nano particles with any shape in a zeolite-based imidazolium salt metal-organic framework (ZIF-8). Disclosure of Invention In view of the above, the application provides a single noble metal nanoparticle overcoated ZIF-8 composite nanomaterial, a preparation method and application thereof, wherein the single noble metal nanoparticle overcoated ZIF-8 shell-core structure is prepared by utilizing the surface adsorption van der Waals force between the surfactant polyvinylpyrrolidone and the noble metal nanoparticles and the electrostatic attraction force between the polyvinylpyrrolidone and zinc ions, the method overcomes the problems that the single nanoparticle overcoated ZIF-8 cannot be realized and the single nanoparticle can not be operated at normal temperature and normal pressure in the existing synthesis method, and the application realizes the nanoparticle overcoated of any shape, thereby effectively overcoming the defects in the prior art. The first aspect of the application provides a preparation method of a single precious metal nanoparticle coated ZIF-8 composite nanomaterial, comprising the following steps of: firstly, noble metal nano-particles and a surfactant are dissolved in a solvent, zinc salt solution is added under magnetic stirring, stirring is carried out at room temperature, then supernatant is removed by centrifugation, precipitate is dispersed in the solvent, dimethyl imidazole solution is injected, standing is carried out for reaction, and the single noble metal nano-particle coated ZIF-8 composite nano-material is obtained. Preferably, the method comprises the steps of, the surfactant is polyvinylpyrrolidone. Preferably, the average molar mass of the polyvinylpyrrolidone is selected from at least one of 10000-360000 g/mol. Specifically, the average molar mass of polyvinylpyrrolidone is 10000-30000 g/mol. More specifically, it may be at least one of 10000g/mol, 20000g/mol, 30000g/mol, 40000g/mol, 58000g/mol, 360000 g/mol. Preferably, the molar concentration of the zinc salt solution is 1.0-10.0 mol L -1, specifically, the molar concentration of the zinc salt solution is 2.0-5.0 mol L -1, and the zinc salt is at least one of zinc nitrate, zinc sulfate, zinc acetate, zinc chloride, zinc perchlorate, zinc tetrafluoroborate, zinc trifluoromethane sulfonate and bis (trifluoromethane sulfonyl) imide zinc. Specifically, zinc salts are all zinc salts commercially available in the field, and the purity of the zinc salts is 95-99.999%. More preferably, the purity of the zinc salt is greater than or equal to 99.0%. Preferably, the stirring time is 2 hours. Preferably, the reaction time is 4 hours. Preferably, the solvent is a methanol solution. Preferably, the molar concentration of the dimethyl imidazole solution is 0.1-1 mol L -1. Specifically, the molar concentration of the dimethylimidazole solution is 0.2-0.5 mol L -1. The second aspect of the application also provides a single noble metal nanoparticle overcladding ZIF-8 composite nanomaterial, the single noble metal nano-particles prepared by the method are coated with ZIF-8 composite nano-materials. The third aspect of the application also provides application of the single noble metal na