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Preparation method of zinc oxide nanocrystal

A nano-zinc oxide, zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of affecting the photocatalytic efficiency of ZnO crystal, large grain size, and reduced specific surface area, and achieve high content of wurtzite crystal form. , the preparation process is simple, the specific surface area and pore volume are large

Active Publication Date: 2018-06-08
SHANDONG HUATAI PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional hydrothermal method is used to prepare ZnO crystals, there is secondary agglomeration during the crystal growth process, resulting in larger grains and reduced specific surface area, which affects the photocatalytic performance of ZnO crystals. Therefore, how to reduce the secondary agglomeration during the growth of ZnO crystals , reducing the grain size and increasing the specific surface area are the two necessary conditions for improving the photocatalytic activity of zinc oxide

Method used

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  • Preparation method of zinc oxide nanocrystal
  • Preparation method of zinc oxide nanocrystal

Examples

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Embodiment 1

[0019] 1, the preparation of TEMPO oxidized cellulose: take by weighing 5g (absolutely dry) bamboo dissolving pulp (α cellulose content ≥ 95%), add deionized water, be mixed with 1.0% suspension, at 25 ℃, mechanical stirring ( 500r / min) to make it evenly dispersed, first add 0.1g TEMPO reagent (TEMPO reagent accounts for 2% of the dissolving pulp quality) in the fiber suspension, adjust the pH of the suspension to be about 10, then add 0.1g sodium bromide reagent, Continue stirring to keep the pH of the suspension at about 10, then add dropwise (1 drop / s) the aqueous sodium hypochlorite solution of 12mmol / g (available chlorine content), when the addition is complete, keep the pH of the suspension at about 10, and keep the temperature at At 25°C, react for 24 hours, then add a small amount of absolute ethanol to terminate the reaction, centrifuge the TEMPO oxidized cellulose suspension (10000r / min) for 30min, and wash it with deionized water for several times until there is no c...

Embodiment 2

[0024]1, the preparation of TEMPO oxidized cellulose: take by weighing 5g (absolutely dry) bamboo dissolving pulp (α cellulose content ≥ 95%), add deionized water, be mixed with 1.0% suspension, at 25 ℃, mechanical stirring ( 500r / min) to make it evenly dispersed, first add 0.1g TEMPO reagent (TEMPO reagent accounts for 2% of the dissolving pulp quality) in the fiber suspension, adjust the pH of the suspension to be about 10, then add 0.1g sodium bromide reagent, Continue stirring to keep the pH of the suspension at about 10, then add dropwise (1 drop / s) the sodium hypochlorite aqueous solution of 6mmol / g (available chlorine content), when the addition is complete, keep the pH of the suspension at about 10, and keep the temperature at At 25°C, react for 24 hours, then add a small amount of absolute ethanol to terminate the reaction, centrifuge the TEMPO oxidized cellulose suspension (10000r / min) for 30min, and wash it with deionized water for several times until there is no chl...

Embodiment 3

[0029] 1, the preparation of TEMPO oxidized cellulose: take by weighing 5g (absolutely dry) bamboo dissolving pulp (α cellulose content ≥ 95%), add deionized water, be mixed with 1.0% suspension, at 25 ℃, mechanical stirring ( 500r / min) to make it evenly dispersed, first add 0.1g TEMPO reagent (TEMPO reagent accounts for 2% of the dissolving pulp quality) in the fiber suspension, adjust the pH of the suspension to be about 10, then add 0.1g sodium bromide reagent, Continue stirring to keep the pH of the suspension at about 10, then add dropwise (1 drop / s) the aqueous sodium hypochlorite solution of 12mmol / g (available chlorine content), when the addition is complete, keep the pH of the suspension at about 10, and keep the temperature at At 25°C, react for 24 hours, then add a small amount of absolute ethanol to terminate the reaction, centrifuge the TEMPO oxidized cellulose suspension (10000r / min) for 30min, and wash it with deionized water for several times until there is no c...

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Abstract

The invention belongs to the field of a chemical industry, and particularly relates to a preparation method of a zinc oxide nanocrystal, so that the photocatalytic activity of zinc oxide is improved.The method comprises the steps of firstly preparing TEMPO oxidized cellulose, then respectively grafting a polymer containing carboxyl, a polymer containing sulfonyl, or a polymer containing an epoxygroup through a heterogeneous free radical polymerization method, preparing to obtain modified TEMPO oxidized cellulose, then adopting the modified TEMPO oxidized cellulose as a template, adsorbing aprecursor zinc acetate of zinc oxide, obtaining cellulose / zinc oxide compound under hydrothermal reaction, calcining to remove the template, and finally obtaining the zinc oxide nanocrystal. The ZnOnanocrystal prepared through the method provided by the invention can replace an existing ZnO photocatalytic material, has the characteristics of high wurtzite crystal form content, large specific surface area and large pore volume, shows a better photocatalytic performance, is simple in preparation process, and belongs to an environment-friendly material.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of zinc oxide nanocrystals. Background technique [0002] At present, with the frequent detection of new trace organic pollutants such as pharmaceuticals and personal care products (PPCPs) in the effluent of urban sewage plants and in the water environment, PPCPs have complex components, strong toxicity, and are difficult to biodegrade. Accumulate in the environment, endanger human health through food chain enrichment, and produce chronic toxicity. However, the traditional sewage treatment process and drinking water treatment process have basically no effect on the removal of a considerable part of PPCPs. Semiconductor photocatalysis technology can directly convert light energy into chemical energy and promote the synthesis and degradation of compounds. It has the advantages of low energy consumption, high efficiency, no secondary pollution and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
CPCC01G9/02C01P2002/72C01P2004/03C01P2004/64C01P2006/12C01P2006/14
Inventor 肖禾刘胜楠吴慧陈礼辉黄六莲
Owner SHANDONG HUATAI PAPER
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