Uniformly coordinating precipitation method for preparing nano zinc oxide

A technology of coordinated uniform precipitation and nano-zinc oxide, applied in chemical instruments and methods, zinc oxide/zinc hydroxide, oxygen/ozone/oxide/hydroxide, etc., can solve the problem of impure products and difficulty in obtaining particle size It can control the product and other problems to achieve the effect of uniform particle size distribution

Inactive Publication Date: 2005-05-18
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or prepare basic zinc carbonate first, then mix it with sodium dodecylbenzenesulfonate, and heat and decompose it to prepare nano-zinc oxide. Not only is it difficult to obtain a product with a controllable particle size, but also because of will leave oxides of metallic sodium in the product and make the product impure

Method used

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  • Uniformly coordinating precipitation method for preparing nano zinc oxide
  • Uniformly coordinating precipitation method for preparing nano zinc oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, the steps of preparing nano-zinc oxide by coordination uniform precipitation method are described as follows:

[0015] Using zinc oxide as raw material, ammonia water NH 3 ·H 2 O and ammonium bicarbonate are complexing agents and simultaneously used as precipitating agents to prepare zinc ammonia complex solution, and then add ammonium sulfide or sodium sulfide solution with a concentration of 0.1-1mol / l until white precipitation just appears, and obtain refined tetracarbonate after filtration Solution of ammoniated zinc(II) complex.

[0016]

[0017] (M 2+ for heavy metal ions)

[0018] The refined complex solution is heated or diluted with water, and as the concentration of ammonia decreases, zinc ions are uniformly precipitated in the entire solution, and immediately react with carbonate groups evenly distributed in the solution system to uniformly generate basic zinc carbonate precipitation:

[0019]

[0020] Heat and decompose...

Embodiment 2

[0037] Example 2, at room temperature, 1 molar amount of solid zinc oxide and 1 to 2 molar amounts of solid sodium bicarbonate or sodium carbonate and 3-5 molar amounts of ammonia water NH 3 ·H 2 O mixed, react at room temperature until the solid zinc oxide is completely dissolved; while stirring, add dropwise a solution of ammonium sulfide or sodium sulfide with a concentration of 0.1-1mol / l until a white precipitate just appears, and obtain refined tetraammonium carbonate after filtration Zinc (II) complex solution; then add a total weight of 0.3-8% surfactant to the above solution, slowly add distilled water to the complex solution under stirring until it just appears turbid, and let it Precipitate for 1-4 hours, filter to obtain basic zinc carbonate precipitate, wash with ethanol or methanol or acetone with a concentration of 80% or more, filter, dry at 60-80°C, and then place it in a heating furnace at 200-800 Decompose by heating at ℃ for 1 to 4 hours to obtain nanomete...

Embodiment 3

[0038] Example 3, at room temperature, 1 molar amount of solid zinc oxide and 1 to 2 molar amounts of solid ammonium bicarbonate or ammonium carbonate and 3-5 molar amounts of ammonia water NH 3 ·H 2 O mixed, react at room temperature until the solid zinc oxide is completely dissolved; while stirring, add dropwise a solution of ammonium sulfide or sodium sulfide with a concentration of 0.1-1mol / l until a white precipitate just appears, and obtain refined tetraammonium carbonate after filtration Zinc (II) complex solution; then add a total weight of 0.3-8% surfactant to the above solution, place the solution in a water bath at 40-50°C, place it under stirring for 8-24 hours, and then filter to obtain For basic zinc carbonate precipitation, wash and filter with ethanol or methanol or acetone with a concentration of more than 80%, and then dry at 60°C; put the dried precipitate into a heating furnace, and heat and decompose it at 200-800°C1 ~ 4 hours to obtain nanometer zinc oxi...

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Abstract

The present invention relates to uniformly coordinating precipitation process of preparing nanometer zinc oxide. The technological scheme includes the reaction between zinc oxide or zinc salt material and ammonia and carbonate as coordinating agent to produce water soluble coordinating compound tetraammonium-zinc carbonate solution; adding sulfide solution to eliminate heavy metal ion inside the coordinating compound solution; adding surfactant, water for dilution or heating decomposing the coordinating compound solution to separate zinc ion and to react with carbonate radical ion to produce fine basic zinc carbonate precipitate; washing the precipitate with ethanol, methanol or acetone, filtering, stoving at 40-80 deg.c and heating at 200-800 deg.c to decompose into nanometer zinc oxide. The production process is simple and has low cost.

Description

technical field [0001] The invention relates to a method for preparing nano zinc oxide. Background technique [0002] With the development of science and technology, the preparation and wide application of nanomaterials has become a hot spot in the 21st century. There are many ways to prepare nano-zinc oxide. The mechanical method can only obtain particles with a particle size of 1 micron. The gas-phase method has complex processes, high cost, and large one-time investment; the alcohol-salt hydrolysis method in the liquid-phase method, sol-gel Both the microemulsion method and the microemulsion method are complicated in process and high in cost; the direct precipitation method is likely to cause the precipitant to be too concentrated locally and agglomerate. A total of 23 relevant documents were searched through the novelty search, including 15 research articles and 8 patents. In relevant documents, only Zu Yong, Liu Chaofeng and others reported the preparation of nano-zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/36C01G9/02
Inventor 邓建成许律
Owner XIANGTAN UNIV
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