Micro-nano ZnO/composite cellulose strip material and preparation method thereof

A technology of composite cellulose and cellulose fibers, applied in chemical instruments and methods, nanotechnology for materials and surface science, organic compound/hydride/coordination complex catalysts, etc., can solve the high temperature of nano-ZnO , environmental pollution, zinc source is not easy to permeate, etc., to achieve the effect of lowering the temperature of hydrothermal synthesis, promoting production, and making the preparation process clean and environmentally friendly

Active Publication Date: 2015-09-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above two types of methods have the following disadvantages: the first type of method uses fibers or films as carriers, and the zinc source is not easy to penetrate into the carrier; and the shape of the final product is fibers or films, while the shape of industrial catalysts is generally granular or strip
The second type of method requires the selection of solvents for cellulose or cellulose derivatives, which causes environmental pollution; nano-ZnO particles are not easily dispersed in cellulose or cellulose derivative solutions, and cause adverse effects on spinning into fibers or film-forming processes. Influence; the preparation of nano-ZnO alone generally requires a higher temperature

Method used

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  • Micro-nano ZnO/composite cellulose strip material and preparation method thereof
  • Micro-nano ZnO/composite cellulose strip material and preparation method thereof
  • Micro-nano ZnO/composite cellulose strip material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Add 1 g of wood pulp cellulose fibers to 65% (wt%) ZnCl 2 In the aqueous solution, pretreat for 4 hours in a constant temperature bath at 60°C. Use a syringe to moisten and partially dissolve the cellulose ZnCl 2 The aqueous solution was slowly injected into a 30% NaOH aqueous solution, and the precipitation time was 0.5h. When the pH value of the system was adjusted to 9, it was left to stand for 24 hours to obtain a strip-shaped ZnO precursor / cellulose. The strip-shaped ZnO precursor / cellulose was put into a hydrothermal synthesis kettle, and the hydrothermal reaction was carried out under the conditions of pH 9 and temperature 120°C, and the reaction time was 6h. Wash the strips of ZnO / cellulose to be free of Cl - Finally, put it in an ultra-low temperature refrigerator. After freezing, place the sample in a freeze dryer. After drying, a new strip-shaped nano-ZnO / cellulose fiber material is obtained.

[0037] At the same time, ZnO particles were prepared by the sa...

Embodiment 2

[0041] Add 1 g of cotton pulp cellulose fiber to 65% (wt%) ZnCl 2 In the aqueous solution, it was pretreated in a constant temperature bath at 40°C for 12h. Use a syringe to moisten and partially dissolve the cellulose ZnCl 2 The aqueous solution was slowly injected into a 20% NaOH aqueous solution, and the precipitation time was 3 hours. When the pH value of the system was adjusted to 7, it was left to stand for 36 hours to obtain a strip-shaped ZnO precursor / cellulose. The strip ZnO precursor / cellulose was put into a hydrothermal synthesis kettle, and the hydrothermal reaction was carried out under the conditions of pH 7 and temperature 170°C, and the reaction time was 4h. Wash the strips of ZnO / cellulose to be free of Cl - Finally, put it in an ultra-low temperature refrigerator. After freezing, place the sample in a freeze dryer. After drying, a new strip-shaped nano-ZnO / cellulose fiber material is obtained.

[0042] Depend on Figure 8It can be seen that the strip ZnO...

Embodiment 3

[0045] Add 1 g of bamboo pulp cellulose fibers to 65% (wt%) ZnCl 2 In aqueous solution, pretreatment in a constant temperature bath at 70°C for 2h. Use a syringe to moisten and partially dissolve the cellulose ZnCl 2 The aqueous solution was slowly injected into a 15% NaOH aqueous solution, and the precipitation time was 5 hours. When the pH value of the system was adjusted to 10, it was left to stand for 48 hours to obtain a strip-shaped ZnO precursor / cellulose. The strip ZnO precursor / cellulose was put into a hydrothermal synthesis kettle, and the hydrothermal reaction was carried out under the conditions of pH 10 and temperature 100° C., and the reaction time was 10 h. Wash the strips of ZnO / cellulose to be free of Cl - Finally, put it in an ultra-low temperature refrigerator. After freezing, place the sample in a freeze dryer. After drying, a new strip-shaped nano-ZnO / cellulose fiber material is obtained.

[0046] Depend on Figure 11 It can be seen that the strip ZnO / ...

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Abstract

The invention discloses a preparation method of a micro-nano ZnO / composite cellulose strip material. The method is as follows: using a ZnCl2 aqueous solution as a moistening and swelling agent and a solvent of cellulose and a zinc source of nano ZnO, using dissolving pulp cellulosic fibers as cellulose raw materials, moistening, swelling and partially dissolving the cellulose raw materials, performing injection eutectoid and hydrothermal synthesis and then freeze-drying, so as to prepare the micro-nano ZnO / cellulose strip material which uses raw cellulosic fibers and regenerated cellulose fibers as carriers. As the ZnCl2 aqueous solution is used as the moistening and swelling agent and the solvent of cellulose and the zinc source of nano ZnO, no additional cellulose solvent is required, and the preparation process is clean and environment-friendly; in addition, after cellulose is moistened, swelled and partially dissolved, hydroxyls and zinc ions of the cellulose molecules are combined, which promotes the generation of nano ZnO, and the hydrothermal synthesis temperature is obviously reduced, therefore, the preparation process has the energy saving advantage.

Description

technical field [0001] The invention relates to a cellulose composite material, in particular to a nano-micro ZnO / composite cellulose strip material and a preparation method thereof. Background technique [0002] Since Iijima's discovery of carbon nanotubes, nanomaterials have attracted great interest because of their many special chemical properties. ZnO is a typical wide-bandgap semiconductor material with excellent performance. Due to the quantum size and small size effect, nano-ZnO exhibits special properties and is widely used in photocatalysis, photoelectric conversion, and gas sensors. The preparation methods of ZnO nanomaterials mainly include vapor phase deposition method, template method, microemulsion method, sol-gel method, hydrothermal synthesis method, etc. The shapes of the prepared products include nanoparticles, nanorods, nanowires, nanoarrays and Nanofilm, etc. Due to the small particle size and high surface energy of nano-ZnO, it is easy to agglomerate, ...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/26B82Y30/00
Inventor 李小保柏茜茜张雪李力成叶菊娣洪建国李宇欣
Owner NANJING FORESTRY UNIV
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