A kind of hydrothermal synthesis method of boehmite superfine powder with core-shell structure

A technology of ultra-fine powder and core-shell structure, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of difficult preparation of additives, increased cost, environmental pollution, etc., and achieves simple and flexible morphology control methods, uniform dispersion, and avoids Effects of Environmental Pollution

Inactive Publication Date: 2015-08-19
TAISHAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surfactant-assisted hydrothermal synthesis is a common method for preparing boehmite with different shapes. We used self-made amphiphilic block copolymer polystyrene-block-polyhydroxyethyl acrylate (PSt-b-PHEA) as Additives, using hydrothermal method to prepare boehmite powder with core-shell structure (preparation of ultrafine powder with core-shell structure boehmite by hydrothermal method. Journal of Inorganic Chemistry, 2008, 24(5): 760-764), However, it has the disadvantages of difficult preparation of additives, high cost, and certain pollution to the environment.
In order to overcome the shortage of organic additives, Liangmiao zhang's research group used Trisodium citrate dihydrate as an additive to prepare a core-shell structure boehmite powder (One-pot template-free synthesis of mesoporous boehmite core-shell and hollow spheres by a simple solvothermal route, Materials Research Bulletin.2010, 45:429-436; Hydrothermal synthesis and characterization of core / shell ALOOH microspheres, Microporous and Mesoporous Materials.2009, 122:42-47), the use of inorganic salt additives, Although the purpose of morphology regulation is achieved, irrelevant ions are also introduced at the same time, and these ions cannot be converted into products and can only be discharged into the environment, which increases costs and causes pollution

Method used

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  • A kind of hydrothermal synthesis method of boehmite superfine powder with core-shell structure
  • A kind of hydrothermal synthesis method of boehmite superfine powder with core-shell structure

Examples

Experimental program
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Embodiment 1

[0018] First, pure Al will be analyzed 2 (SO 4 ) 3 18H 2 O was added to deionized water and stirred on a magnetic stirrer to dissolve it to obtain Al 3+ A transparent solution A with a concentration of 0.1mol / L; secondly, add analytically pure NaOH to deionized water, stir on a magnetic stirrer to dissolve it, and obtain NaOH + A transparent solution B with a concentration of 0.1mol / L; a certain amount of sodium hydroxide solution B is added to solution A, and the amount of solution B added is to precipitate all Al 3+ 10% of the required theoretical demand, continue to stir for half an hour, and make solution C; in solution C, add a certain amount of analytically pure urea solid as a precipitating agent, and the addition of urea is to precipitate all Al 3+ 100% of the required theoretical demand to prepare solution D; then, pour solution D into the polytetrafluoroethylene material of the hydrothermal reactor liner, add a certain amount of water, control the filling degree ...

Embodiment 2

[0021] First, pure Al will be analyzed 2 (SO 4 ) 3 18H 2 O was added to deionized water and stirred on a magnetic stirrer to dissolve it to obtain Al 3+ A transparent solution A with a concentration of 0.4 mol / L; secondly, add analytically pure NaOH to deionized water, stir on a magnetic stirrer to dissolve it, and obtain a transparent solution B with a Na+ concentration of 0.2 mol / L; in solution A A certain amount of sodium hydroxide solution B is added to the solution B, and the amount of solution B added is to precipitate all Al 3+ 5% of the required theoretical demand, continue to stir for half an hour, and make solution C; in solution C, add a certain amount of analytically pure urea solid as a precipitating agent, and the addition of urea is to precipitate all Al 3+ 105% of the required theoretical demand to prepare solution D; then, pour solution D into the polytetrafluoroethylene material of the hydrothermal reactor liner, add a certain amount of water, the filling...

Embodiment 3

[0023] First, pure Al will be analyzed 2 (SO 4 ) 3 18H 2 O was added to deionized water and stirred on a magnetic stirrer to dissolve it to obtain Al 3+ A transparent solution A with a concentration of 0.4 mol / L; secondly, add analytically pure NaOH into deionized water, stir on a magnetic stirrer to dissolve it, and obtain a transparent solution B with a Na+ concentration of 0.4 mol / L; in solution A A certain amount of sodium hydroxide solution B is added to the solution B, and the amount of solution B added is to precipitate all Al 3+ 15% of the required theoretical demand, continue to stir for half an hour, and make solution C; in solution C, add a certain amount of analytically pure urea solid as a precipitating agent, and the addition of urea is to precipitate all Al 3+90% of the required theoretical demand to prepare solution D; then, pour solution D into the polytetrafluoroethylene material of the hydrothermal reactor liner, add a certain amount of water, the fillin...

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Abstract

The invention discloses a hydro-thermal synthesis method of core-shell structural boehmite ultrafine powder. The method is characterized by comprising the following steps: firstly, adding analytically pure Al2(SO4)3.18H2O into deionized water so as to prepare a transparent solution A with the Al<3+> concentration of 0.1-0.4mol / L; adding analytically pure NaOH into the deionized water so as to obtain a transparent solution B with the Na<+1> concentration of 0.1-0.4mol / L; adding a proper amount of sodium hydroxide solution B into the solution A so as to prepare a solution C; adding a proper amount of alkalescence precipitator urea into the solution C so as to obtain a solution D; and pouring the solution D into a polytetrafluoroethylene hydro-thermal reactor liner, adding a proper amount of water, controlling the filling degree to be 67-80%, sealing a hydro-thermal reactor, putting the hydro-thermal reactor into an electro-thermostatic blast oven, controlling the hydro-thermal temperature to be 150-200 DEG C to react for 8-24 hours, and naturally cooling to the room temperature after the reaction is finished.

Description

technical field [0001] The invention relates to a method for preparing boehmite superfine powder, in particular to a method for preparing superfine boehmite powder with a core-shell structure by using the difference in the alkalinity of the precipitant, adding the precipitant step by step, and using a hydrothermal method body method. Background technique [0002] The macroscopic properties of inorganic powder materials not only depend on their chemical composition, but also are largely affected by their particle size and morphology. Aggregates of different microstructures and shapes composed of nano basic units (such as nanoparticles, nanosheets, nanorods), as well as the nanofunctional materials and nanodevices constructed from them, because of their unique properties and potential in many fields applications have attracted much attention. Core-shell particles are a nanoscale ordered assembly structure formed by one nanomaterial coated on the outside of another nanomateri...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01F7/02
Inventor张恭孝吴秀勇
OwnerTAISHAN MEDICAL UNIV