Method for preparing nano zinc oxide by taking nano spherical polyelectrolyte brush as microreactor and application of nano zinc oxide

A polyelectrolyte brush and nano-zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, nanotechnology, etc., to achieve excellent dispersion and excellent photocatalytic activity

Inactive Publication Date: 2013-03-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to solve the above-mentioned existing problems in the process of synthesizing

Method used

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  • Method for preparing nano zinc oxide by taking nano spherical polyelectrolyte brush as microreactor and application of nano zinc oxide
  • Method for preparing nano zinc oxide by taking nano spherical polyelectrolyte brush as microreactor and application of nano zinc oxide
  • Method for preparing nano zinc oxide by taking nano spherical polyelectrolyte brush as microreactor and application of nano zinc oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of Nanospherical Polyelectrolyte Brushes by Thermal Emulsion Polymerization

[0024] Put 22.3 ml of polybutadiene microsphere emulsion (the content of polymer microspheres is 3.0 g), 180 ml of deionized water, and 0.06 g of potassium persulfate into a 500 ml three-neck flask, among which, the dynamic light scattering (DLS) test results It is shown that the hydrodynamic diameter of the polybutadiene microsphere is 130 nanometers, and the solid content of the emulsion is about 13.4%. After fully dissolving under stirring, pump nitrogen gas 3 to 5 times, and control the rotation speed at 300 rpm. After the temperature stabilized to 80°C, maintain the temperature and rotation speed and continue stirring for half an hour. Dissolve 3.0 grams of acrylic acid monomer in 90 milliliters of deionized water, quickly drop it into a three-necked flask under nitrogen, and continue the reaction for 1 hour to obtain a nano-spherical polyelectrolyte brush emulsion. After di...

Embodiment 2

[0026] Preparation of nano-zinc oxide using nano-spherical polyelectrolyte brushes as nano-reactors

[0027] Get 100 milliliters of nano-spherical polyelectrolyte brush emulsions obtained in Example 1 in a 250 milliliter three-necked flask, dissolve 0.125 grams of zinc nitrate hexahydrate in 20 milliliters of deionized water, and slowly add it dropwise to the flask at a rate of 1 second / drop, and continue to stir for one hour at a stirring speed of 300 rpm. Pump nitrogen gas for 3 to 5 times. After the temperature stabilizes to 80°C, dissolve 0.13 g of hexamethylenetetramine in 20 ml of deionized water and add it dropwise to a three-necked flask under a nitrogen atmosphere at a rate of 2 seconds / drop. Maintain the temperature and rotating speed to continue the reaction for 2 hours, and finally obtain nano-zinc oxide loaded on the nano-spherical polyelectrolyte brush, and use a dialysis bag with a molecular weight cut-off of 14000 g / mol to dialyze out small molecular impuritie...

Embodiment 3

[0029] Preparation of high-content nano-zinc oxide using nano-spherical polyelectrolyte brushes as nano-reactors

[0030]Get the nano-spherical polyelectrolyte brush emulsion 100 milliliters that the load of embodiment 2 gained has nano-zinc oxide and 250 milliliters there-necked flasks, then 0.125 gram zinc nitrate hexahydrates are dissolved in 20 milliliters of deionized waters, and slowly drop into flasks, drop The acceleration is 1 second / drop, and the stirring is continued for one hour, and the stirring speed is constant at 300 revolutions / minute. Pump nitrogen gas for 3 to 5 times. After the temperature stabilizes to 80°C, dissolve 0.13 g of hexamethylenetetramine in 20 ml of deionized water and add it dropwise to a three-necked flask under a nitrogen atmosphere at a rate of 2 seconds / drop. Maintain the temperature and rotation speed to continue the reaction for 2 hours, and finally obtain nano-zinc oxide supported on nano-spherical polyelectrolyte brushes. Continue to ...

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Abstract

The invention discloses a method for preparing nano zinc oxide by taking a nano spherical polyelectrolyte brush as a microreactor and an application of the nano zinc oxide. The method comprises the following steps of: with 100-140nm polymeric microspheres as raw materials, initiating graft polymerization of monomers on the surfaces of the polymeric microspheres by adopting a thermal-control emulsion polymerization method to obtain a spherical polyelectrolyte brush with the particle diameter of 140-300nm; after adding a divalent zinc salt water solution, making divalent zinc ions enter into the polyelectrolyte brush under the electrostatic interaction, and carrying out in-situ reaction under the action of a precipitant to obtain nano zinc oxide particles uniformly distributed inside the nano spherical polyelectrolyte brush; and calcining the nano spherical polyelectrolyte brush system loaded with the zinc oxide particles to remove the polyelectrolyte brush to obtain the nano-scale pure zinc oxide particles. The nano zinc oxide particles which are synthesized by taking the spherical polyelectrolyte brush as the microreactor are smaller in particle diameter and uniform to distribute, are an ideal high-efficient nano photocatalyst and can be widely applied in the field of water purification and the like.

Description

technical field [0001] The present invention relates to a preparation method and application of nano-zinc oxide. Specifically, a spherical polyelectrolyte brush is prepared by using a heat-controlled emulsion polymerization method, and then nano-zinc oxide is prepared by using the spherical polyelectrolyte brush as a nanoreactor through an in-situ synthesis method. Composite particles, and finally remove the spherical polyelectrolyte brush as a nanoreactor to obtain nano zinc oxide particles with small particle size and uniform particle size distribution. The obtained nanometer zinc oxide particle can be used as a photocatalyst and applied to water purification and other fields. Background technique [0002] When one end of the polyelectrolyte molecule is connected to the surface or interface of the spherical matrix with a very high graft density, due to the volume exclusion and electrostatic repulsion effects between the polyelectrolyte chains, their free ends will try to s...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y30/00
Inventor 郭旭虹张锐李文玥李公生许军李莉房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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