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A kind of preparation method of nano zno/cellulose composite material

A composite material and cellulose technology, which is applied in the field of preparation of nano-ZnO/cellulose composite materials, can solve the problems of limited composite amount and composite strength, a large amount of water or organic solvent, and low concentration of reactants, so as to achieve easy industrial production, Increased reaction accessibility and high concentration of reactants

Active Publication Date: 2018-08-17
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of the two methods are that when synthesizing nano-ZnO particles or nano-composites, the concentration of reactants is low, most of which are in millimoles per liter (mM), and the preparation process requires a large amount of water or organic solvents
The cellulose carrier does not participate in the control of nano-ZnO crystal size and morphology, the accessibility of ZnO precursor or nano-ZnO to cellulose is low, the composite amount and composite strength of nano-ZnO on cellulose are limited, and the nano-ZnO / cellulose composite material Dimensions below the nanoscale

Method used

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  • A kind of preparation method of nano zno/cellulose composite material
  • A kind of preparation method of nano zno/cellulose composite material

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Effect test

Embodiment 1

[0032] Add 0.5g bleached wood pulp cellulose to 100g ZnCl with a concentration of 65wt% at a temperature of 70°C 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 solution; at the same time, 0.5g of wood pulp cellulose was added to the 8 / 12wt% 100g NaOH / urea solution at a temperature of -12°C and stirred to obtain another transparent and uniform cellulose NaOH / urea solution. The two cellulose solutions were slowly added dropwise to the colloid mill at 5°C, and the reaction continued for 10 minutes when the pH of the system was 8.5. The ZnO / cellulose composite was centrifuged and washed three times with water, and then dried in a drying oven at 105°C to obtain a granular nano-ZnO / cellulose composite material of about 30 nm in size.

Embodiment 2

[0034] Add 1g of bleached wood pulp cellulose to 100g of ZnCl with a concentration of 70wt% at a temperature of 70°C 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 solution; at the same time, 1 g of wood pulp cellulose was added to 8 / 12 wt% 100 g NaOH / urea solution at a temperature of -12° C. and stirred to obtain another transparent and uniform cellulose NaOH / urea solution. The two cellulose solutions were slowly added dropwise to the colloid mill at 15°C, and the reaction continued for 5 minutes when the pH of the system was 9.5. The ZnO / cellulose composite was centrifugally washed with water for 3 times, and then dried in a drying oven at 105° C. to obtain a granular nano-ZnO / cellulose composite material of about 20 nm in size.

Embodiment 3

[0036] 1.5g of cotton linter fiber is added to 100g of ZnCl with a temperature of 70°C and a concentration of 75wt%. 2 Stir in aqueous solution to obtain transparent and uniform cellulose ZnCl 2 Solution; at the same time, 1.5g of cotton linter fibers was added to 8 / 12wt% 100g of NaOH / urea solution with a temperature of -12°C and stirred to obtain another transparent and uniform cellulose NaOH / urea solution. The two cellulose solutions were slowly added dropwise into the colloid mill at 40° C., and the reaction continued for 20 minutes when the pH of the system was 10. The ZnO / cellulose composite was centrifugally washed with water for 3 times, and then dried in a drying oven at 105° C. to obtain a granular nano-ZnO / cellulose composite material of about 20 nm in size.

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Abstract

The invention discloses a method for preparing nanometer zinc oxide / cellulose composite materials. The method includes that high-concentration zinc chloride (ZnCl2) solution and sodium hydroxide (NaOH) / urea solution are cellulose solvents and nanometer zinc oxide (ZnO) reactants at the low temperatures, dissolved celluloses are used as control auxiliaries for preparing nanometer ZnO and are also used as nanometer ZnO agglomeration macromolecular barriers, a colloid mill is used as an efficient mixing reactor, and the nanometer ZnO / cellulose composite materials with the uniform sizes can be prepared. Generation of nanometer ZnO particles can be forcefully promoted under the effects of a large quantity of hydroxyl on dissolved cellulose molecules, zinc ions and OH<-> and efficient mixing effects of the colloid mill at the low temperatures under the condition of the high-concentration reactants, accordingly, the method has the advantages of high reactant concentration, simplicity in operation, low energy consumption and easiness in industrial production.

Description

technical field [0001] The invention belongs to the field of nanometer metal oxide composite materials, and in particular relates to a method for preparing a nanometer ZnO / cellulose composite material under the action of dissolving cellulose and colloid milling with high-concentration reactants. 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] Patent 102787497A discloses a preparation method of a new ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K3/22C01G9/02B82Y40/00
CPCB82Y40/00C01G9/02C01P2004/64C08K3/22C08K2003/2296C08K2201/011C08L1/02
Inventor 王志国马金霞石纯周小凡
Owner NANJING FORESTRY UNIV
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