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Preparation method for strip-type nano ZnO/cellulose gel material

A cellulose gel, 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 fiber or film forming process, etc. To achieve the effect of reducing the temperature of hydrothermal synthesis, cleaning and environmental protection of the preparation process, and promoting the formation of

Active Publication Date: 2015-09-30
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
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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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  • Preparation method for strip-type nano ZnO/cellulose gel material
  • Preparation method for strip-type nano ZnO/cellulose gel material
  • Preparation method for strip-type nano ZnO/cellulose gel material

Examples

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Effect test

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. After freezing, place the sample in a freeze dryer. After drying, a new strip-shaped nano-ZnO / cellulose gel material is obtained. ...

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. After freezing, place the sample in a freeze dryer. After drying, a new strip-shaped nano-Z...

Embodiment 3

[0037] Add 1 g of cotton pulp cellulose fibers to 70% (wt%) ZnCl 2 In aqueous solution, pretreatment 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 for a strip-type nano ZnO / cellulose gel material. A ZnCl2 aqueous solution is used as a solvent for cellulose and a zinc source for nano ZnO; dissolving pulp cellulose fibers are cellulose raw materials; the strip-type nano ZnO / cellulose gel material is prepared by dissolving, co-separation, hydrothermal synthesis and freeze drying. As the ZnCl2 aqueous solution is ingeniously used as the solvent for the cellulose and the zinc source for nano ZnO, other cellulosesolvents are not needed to be added, and the preparation technology is clean and environment-friendly; furthermore, after cellulose is dissolved, hydroxyl on the molecules of the cellulose is combined with zinc ions, so that generation of nano ZnO is promoted, and the hydrothermal synthesis temperature is correspondingly obviously reduced; therefore, the preparation technology has the advantage of energy conservation.

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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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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