Preparation method of porous ZnO block material

A bulk material and volume technology, applied in the field of materials, can solve the problems of long preparation cycle, high cost and complex process, and achieve the effects of short preparation cycle, low cost and few process steps.

Inactive Publication Date: 2016-09-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using templates and other methods to prepare ZnO porous materials, the preparation cycle is long, the process is complicated, and the cost is high. This patent proposes a process of using organic matter to make ions evenly exist in xerogel, and then using direct molding and heat treatment. The crystallization process and the porous formation process are combined into one, and the preparation of porous ZnO materials is completed in one step

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of porous ZnO bulk material, comprising the steps of:

[0020] (1) Dissolve citric acid in ammonia water, the amount of ammonia water is based on the amount of citric acid that can be dissolved, dissolve zinc acetate in the remaining citric acid solution, stir and dissolve to form solution A, wherein, zinc ion: citric acid (molar ratio) =1:0.8.

[0021] (2) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, wherein polyethylene glycol includes polyethylene glycol) Glycol 400, Polyethylene Glycol 4000 and Polyethylene Glycol 6000.) Add in solution A, the concentration of each component of dispersant is controlled at 0.6mol / L, then add dehydrated alcohol and stir to dissolve (the volume of dehydrated alcohol is 2 / 3 of the volume of ammonia water), and then adjust the pH value to 5-8 to obtain the precursor solution...

Embodiment 2

[0025] A preparation method of porous ZnO bulk material, comprising the steps of:

[0026] (1) Dissolve citric acid in ammonia water, the amount of ammonia water is based on the amount of citric acid that can be dissolved, dissolve zinc acetate in the remaining citric acid solution, stir and dissolve to form solution A, wherein, zinc ion: citric acid (molar ratio) =1:1.5.

[0027] (2) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol.) Add in solution A, each dispersant The concentration of the components is controlled at 0.6 mol / L, then add absolute ethanol and stir to dissolve (the volume of absolute ethanol is equal to the volume of ammonia water), and then adjust the pH value to 5-8 to obtain the precursor solution.

[0028] (3) Put the precursor solution in a water bath at 80°C for 20-30 minutes, then dry at 140°C to form a xerogel, an...

Embodiment 3

[0031] A preparation method of porous ZnO bulk material, comprising the steps of:

[0032] (1) Dissolve citric acid in ammonia water, the amount of ammonia water is based on the amount of citric acid that can be dissolved, dissolve zinc acetate in the remaining citric acid solution, stir and dissolve to form solution A, wherein, zinc ion: citric acid (molar ratio) =1:1.

[0033] (2) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol.) Add in solution A, each dispersant The concentration of the components is controlled at 0.01, 0.1, 0.1, 0.5, 0.6, 0.6mol / L, then add absolute ethanol and stir to dissolve (the volume of absolute ethanol is 2 / 3 of the volume of ammonia water), and then adjust the pH value to 5~ 8 to obtain the precursor solution.

[0034] (3) Put the precursor solution in a water bath at 85°C for 20-30min, then dry it at 150°C ...

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Abstract

The invention discloses a preparation method of a porous ZnO block material. The method comprises the following steps: dissolving a raw material zinc acetate in an ammonia water solution of citric acid, adding a certain concentration of a compounded dispersant, carrying out a gelatinizing process to form a spatial network structure in order to make zinc ions uniformly exist in the network structure, gelatinizing the obtained material, carrying out dry gelatinization, carrying out direct compaction molding, and sintering obtained blocks to obtain the porous ZnO block material. The method has the advantages of short preparation period, simple technology and device, low cost, and realization of uniform dimensions and uniform distribution of apertures of the obtained porous material through a proper dispersant formula.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a porous ZnO block material. Background technique [0002] Zinc oxide has a wide band gap and high exciton binding energy. It is a wide band gap semiconductor material. Good application prospects, and the porous structure of ZnO porous materials makes it have a high specific surface area, which can effectively improve the sensitivity, adsorption and catalytic activity of ZnO materials, among which the most important factor affecting the performance of porous ZnO porous materials is the size of the pores and distribution. When using templates and other methods to prepare ZnO porous materials, the preparation cycle is long, the process is complicated, and the cost is high. This patent proposes a process of using organic matter to make ions evenly exist in xerogel, and then using direct molding and heat treatment. The crystallization process a...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/453
CPCC04B35/453C04B38/06
Inventor 伍媛婷栗梦龙王秀峰王莉丽
Owner SHAANXI UNIV OF SCI & TECH
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