Method for preparing ZnO nanopowder from cellulose zinc chloride solution

A technology of zinc chloride solution and cellulose is applied in the field of preparation of nano-ZnO powder, which can solve the problems of easy agglomeration of nano-ZnO and low concentration of zinc source reactant, and achieve high concentration of reactant, good shape and simple operation. Effect

Inactive Publication Date: 2016-10-12
NANJING FORESTRY UNIV
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Problems solved by technology

It mainly solves the technical barriers in the existing methods that the concentration of zinc source reactants is low and the generated nano-ZnO is easy to agglomerate

Method used

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  • Method for preparing ZnO nanopowder from cellulose zinc chloride solution
  • Method for preparing ZnO nanopowder from cellulose zinc chloride solution

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Experimental program
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Effect test

Embodiment 1

[0035] Add 1g of bleached wood pulp cellulose to 100g of ZnCl with a temperature of 70°C and a concentration of 65wt%. 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 solution. Cellulose ZnCl 2 After the solution was cooled to 5°C, it was placed in a colloid mill, and slowly added dropwise to the cellulose ZnCl in the colloid mill with 40wt% NaOH solution. 2 In the solution, when the pH value of the system was 8.5, the dropwise addition of NaOH was stopped, and the reaction was continued for 10 minutes to obtain a nano-ZnO / cellulose composite. The ZnO / cellulose composite was centrifugally washed with water for 3 times, dried in a 105°C drying oven, and then calcined in a 400°C muffle furnace for half an hour to obtain 50-100nm granular nano ZnO powder.

Embodiment 2

[0037] Add 2g of bleached wood pulp cellulose to 100g of ZnCl with a temperature of 80°C and a concentration of 75wt%. 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 solution. Cellulose ZnCl 2 After the solution was cooled to 15°C, it was placed in a colloid mill, and slowly added dropwise to the cellulose ZnCl in the colloid mill with 30wt% NaOH solution. 2 In the solution, when the pH value of the system is 9.0, the dropwise addition of NaOH solution is stopped, and the reaction is continued for another 20 minutes to obtain a nanometer ZnO / cellulose composite. The ZnO / cellulose composite was centrifugally washed with water for 3 times, dried in a 105°C drying oven, and then calcined in a 500°C muffle furnace for half an hour to obtain 50-90nm granular nano ZnO powder.

Embodiment 3

[0039] Add 3g of bleached wood pulp cellulose to 100g of ZnCl with a temperature of 75°C and a concentration of 65wt%. 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 solution. Cellulose ZnCl 2 After the solution is cooled to 25°C, it is placed in the colloid mill, and slowly added dropwise to the cellulose ZnCl in the colloid mill with 40wt% NaOH solution. 2 In the solution, when the pH value of the system is 9.5, the dropwise addition of the NaOH solution is stopped, and the reaction is continued for another 30 minutes to obtain a nanometer ZnO / cellulose composite. Centrifuge and wash the ZnO / cellulose composite for 3 times, put it in a drying oven at 105°C to dry, and then put it in a muffle furnace at 500°C for half an hour to obtain a granular nano-ZnO powder with a uniform particle size of about 20-50nm .

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Abstract

The invention discloses a method for preparing ZnO nanopowder from a cellulose zinc chloride solution. The method includes that with a high-concentration ZnCl2 solution as a cellulose solvent, a nano-zinc oxide as a zinc source and cellulose dissolved in ZnCl2 as both a ZnO nanopowder preparation process control auxiliary and a macromolecular blocking agent for ZnO nanopowder agglomeration, the agglomeration-free ZnO nanopowder uniform in size is prepared in a colloid grinder serving as an efficient mixing reactor at a low temperature. The method for preparing the ZnO nanopowder from the cellulose zinc chloride solution has the advantages that generation of ZnO nanoparticles under high-concentration reactants at the low temperature is effectively promoted under the action of a great number of hydroxyls and zinc ions on dissolved cellulose molecules as well as efficient mixing of the colloid grinder, and accordingly the method is high in reactant concentration, simple to implement, low in energy consumption and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of metal oxide nano-powder processing and application, and mainly relates to the preparation technology of nano-ZnO powder, in particular to the preparation method of high-concentration zinc source reactants to prepare nano-ZnO powder under the action of dissolving cellulose and colloid mill. Background technique [0002] Zinc oxide (ZnO) is listed as "generally recognized as safe" by the US FDA. The changes in the surface electrons and crystal structure of the micronized nano-ZnO grains will produce the characteristics of surface and volume effects, quantum size and macroscopic tunneling effects that macroscopic objects do not have, reflecting excellent photocatalysis, UV shielding, antibacterial, and optical properties. Luminescence and other properties have shown important application value in the fields of ceramics, chemical industry, environmental protection, optoelectronics, biology and medicine. [0003] The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y40/00
CPCC01G9/02C01P2002/72C01P2004/03C01P2004/64
Inventor 马金霞王志国孙兆闯周小凡
Owner NANJING FORESTRY UNIV
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