A kind of preparation method of strip nano zno/cellulose gel material

A cellulose gel and cellulose technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of high temperature of nano ZnO, environmental pollution, unfavorable spinning into fibers or film forming process, etc. Achieve the effect of lowering the temperature of hydrothermal synthesis, cleaning and environmental protection of the preparation process, and promoting the production

Active Publication Date: 2017-08-01
NANJING FORESTRY UNIV
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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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  • A kind of preparation method of strip nano zno/cellulose gel material
  • A kind of preparation method of strip nano zno/cellulose gel material
  • A kind of preparation method of strip nano zno/cellulose gel material

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Embodiment 1

[0028] Add 1 g of wood pulp cellulose fibers to 65% (wt%) ZnCl 2 In aqueous solution, pretreatment in a low-temperature bath at 10°C for 1 h. The above liquid-solid material was placed in a water bath at 70° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2 Slowly inject 20% NaOH aqueous solution into the aqueous solution, adjust the pH value of the system to 9, and let it stand for 24 hours to obtain a strip-shaped ZnO precursor / cellulose gel. The strip ZnO precursor / cellulose gel 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 6 h. Wash strips of ZnO / cellulose gel to be free of Cl - Finally, put it in an ultra-low temperature refrigerator, and place the sample in a freeze dryer after freezing. After drying, a new strip-shaped nano-ZnO / cellulose gel material is obtaine...

Embodiment 2

[0034] Add 1 g of bamboo pulp cellulose fibers to 68% (wt%) ZnCl 2 In the aqueous solution, pretreat for 3 hours in a low-temperature bath at -10°C. The above liquid-solid material was placed in a water bath at 60° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2 The aqueous solution was slowly injected into a 15% NaOH aqueous solution, and when the pH value of the system was adjusted to 7, it was left to stand for 48 hours to obtain a strip-shaped ZnO precursor / cellulose gel. The strip-shaped ZnO precursor / cellulose gel was put into a hydrothermal synthesis kettle, and the hydrothermal reaction was carried out under the conditions of pH=7 and temperature of 170°C, and the reaction time was 4h. Wash strips of ZnO / cellulose gel to be free of Cl - Finally, put it in an ultra-low temperature refrigerator, and place the sample in a freeze dryer after freezing. After drying, a new strip-shaped nan...

Embodiment 3

[0037] Add 1 g of cotton pulp cellulose fibers to 70% (wt%) ZnCl 2 In the aqueous solution, pretreat in a low-temperature bath at 30°C for 0.5h. The above liquid-solid material was placed in a water bath at 90° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2The aqueous solution was slowly injected into a 30% NaOH aqueous solution, and when the pH value of the system was adjusted to 10, it was left to stand for 36 hours to obtain a strip-shaped ZnO precursor / cellulose gel. The strip-shaped ZnO precursor / cellulose gel 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 strips of ZnO / cellulose gel to be free of Cl - Finally, put it in an ultra-low temperature refrigerator, and place the sample in a freeze dryer after freezing. After drying, a new strip-shaped nano-Z...

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Abstract

The invention discloses a preparation method of a strip nano-ZnO / cellulose gel material. ZnCl2 aqueous solution is used as a solvent for cellulose and a zinc source of nano-ZnO, and the cellulose fiber of a dissolved pulp is used as a cellulose raw material. Precipitation, hydrothermal synthesis and freeze-drying, a new strip-shaped nano-ZnO / cellulose gel material was prepared. The invention skillfully uses ZnCl2 aqueous solution as the solvent of cellulose and the zinc source of nanometer ZnO, therefore, no need to add other cellulose solvents, and the preparation process is clean and environment-friendly. In addition, after the cellulose is dissolved, the hydroxyl groups on its molecules combine with zinc ions to promote the formation of nano-ZnO, and the hydrothermal synthesis temperature is also significantly reduced accordingly. Therefore, the preparation process has the advantage of energy saving.

Description

technical field [0001] The invention belongs to the technical field of new fiber materials, and in particular relates to a preparation method of a strip nano ZnO / cellulose gel material. 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 agglomerat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B82Y40/00B82Y30/00
Inventor 李小保张雪柏茜茜李艳瑞李力成叶菊娣洪建国李宇欣
Owner NANJING FORESTRY UNIV
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