Porous silver micro-nano structure and shape and size controllable preparation method thereof

A technology of micro-nano structure and porous silver, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult separation, uncontrollable factors and multiple products, and achieve simple methods and accelerated catalysis Reactive, good permeability effect

Inactive Publication Date: 2015-04-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of many uncontrollable factors in the chemical replacement in the background technology and the disadvantages that the prepared product is not easy to separate and easily introduce impurities, and discloses a product with large specific surface area, high activity and good permeability, and Silver micro-nano crystals with porous structure, design a simple and easy-to-manipulate morphology and a method for preparing porous silver micro-nano structures

Method used

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  • Porous silver micro-nano structure and shape and size controllable preparation method thereof
  • Porous silver micro-nano structure and shape and size controllable preparation method thereof
  • Porous silver micro-nano structure and shape and size controllable preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1 4

[0041] The preparation of the porous silver micro-nano structure of embodiment 1 quadrilateral

[0042] 1) Preparation of tetragonal silver micro-nanostructure precursors

[0043] Mix and dissolve 0.208 gram of sodium citrate and 0.393 gram of sodium carbonate in deionized water (the molar ratio of sodium citrate, sodium carbonate and citric acid is 2:1:0, pH is about 6.6), and the resulting mixed buffer solution is loaded into In a 250ml beaker, drip silver nitrate solution (0.357 grams of silver nitrate amount dropped in) under room temperature and magnetic stirring, white precipitate occurs when just dripping silver nitrate solution, along with the increase of the amount of silver nitrate dropped, the solution color gradually deepens. After the dropwise addition, keep stirring for 1 hour to fully react and contact, then let stand at room temperature for 8 hours, and a large amount of precipitates are formed during the precipitation process. After the precipitation, the D-...

Embodiment 2 6

[0046] Example 2 Preparation of hexagonal sandwich porous silver micro-nanostructure

[0047] The preparation process is the same as in Example 1. Just double the amount of sodium carbonate (the molar ratio of sodium citrate, sodium carbonate and citric acid is 1: 1: 0, and the pH is about 7.4). The shape of the silver micro-nano structure precursor formed when the amount of sodium carbonate added is slightly less is basically hexagonal. When the precipitation time reaches 40 hours, the hexagon also undergoes the precipitation etching process and becomes two ends. The shape of the sandwich is connected in the middle. Finally, a hexagonal sandwich porous silver micro-nano structure with a length of about 36±2 μm, a width of about 6±1 μm, and a thickness of about 1.4±0.1 μm was obtained, with a specific surface area of ​​175.93 m 2 / g.

[0048] Figure 5 The scanning electron micrographs of the prepared hexagonal sandwich microsheet precursor are given. Image 6 The scannin...

Embodiment 3 6

[0049] Example 3 Preparation of hexagonal sandwich porous silver micro-nanostructure

[0050] The preparation process is the same as in Example 1. Just increase the amount of sodium carbonate to 1.5 times (the mol ratio of sodium citrate, sodium carbonate and citric acid is 4:3:0, pH is about 7.1). The morphology of the silver micro-nanostructure precursor formed when the amount of sodium carbonate added is slightly less is basically hexagonal. When the precipitation time reaches 40 hours, the hexagonal shape also becomes through the precipitation etching process. The two ends are connected and the middle is a sandwich shape. Finally, a hexagonal sandwich porous silver micro-nano structure with a length of about 25±2 μm, a width of about 5±1 μm, and a thickness of about 1.0±0.1 μm with a uniform overall size was obtained, with a specific surface area of ​​199.06 m 2 / g.

[0051] Figure 5 The scanning electron micrographs of the prepared hexagonal sandwich microsheet precu...

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Abstract

The invention provides a porous silver micro-nano structure and a shape and size controllable preparation method of the porous silver micro-nano structure, and belongs to the technical field of precious metal porous nano-crystalline structures. The overall appearance shape of the porous silver micro-nano structure is a hexagonal sandwich shape or a quadrilateral shape or a strip shape and is formed by stacking 30-50-nanometer silver basic composition units, and multiple pores are formed by stacking silver basic composition units. The preparation method includes the steps that sodium citrate, sodium carbonate and citric acid are dissolved in deionized water, a silver nitrate solution and a D-glucose solution are added in sequence, the mixture is stirred and sinks, and a precursor is obtained after centrifugal drying; the porous silver micro-nano structure is obtained after heat treatment is conducted on the precursor. The method is simple, environmentally friendly and controllable in shape and size; the prepared porous silver micro-nano structure is uniform in size distribution, large in specific surface area, good in permeability and higher in catalytic rate for p-nitrophenol, and has potential application in the precious metal catalytic aspect.

Description

technical field [0001] The invention belongs to the technical field of porous micro-nano structures of precious metals, and relates to a method for preparing high-quality micro-nano crystals with large specific surface area, high activity, good permeability and porous structure in a simple, green and environment-friendly manner and research on related catalytic properties. Background technique [0002] For a long time, porous micro-nanostructures have been a hot topic in the field of scientific research. Due to their large specific surface area, relatively small density and good permeability, they are widely used in catalysis, sensors, drug delivery, and energy conversion and storage. Caused widespread concern. Many previous reports prepared porous noble metal micro-nanomaterials in the form of templates. Since the template is limited to the preparation of some porous thin layers or irregular shapes stacked by nanoparticles, and the post-processing of the template also incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00
Inventor 隋永明徐满刘欣美邹勃
Owner JILIN UNIV
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