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Nano ZnO/cellulose gel particles and preparation method thereof

A cellulose gel and cellulose fiber technology, applied in the field of nano-ZnO/cellulose gel particles and their preparation, can solve the problems of high temperature, environmental pollution, unfavorable spinning into fiber or film forming process, etc. Reduce, promote the generation, the effect of clean and environmental protection in the preparation process

Active Publication Date: 2015-09-30
NANJING FORESTRY UNIV
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  • Description
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Problems solved by technology

The second is to prepare nano-ZnO first, then disperse nano-ZnO in a solution of cellulose or cellulose derivatives (such as cellulose acetate, etc.), and finally precipitate cellulose or cellulose derivatives to obtain nano-ZnO / cellulose Composite materials; this method requires the selection of solvents for cellulose or cellulose derivatives, causing environmental pollution; nano-ZnO particles are not easy to disperse 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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  • Nano ZnO/cellulose gel particles and preparation method thereof
  • Nano ZnO/cellulose gel particles and preparation method thereof
  • Nano ZnO/cellulose gel particles and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Add 1 g of wood pulp cellulose to 68% (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. ZnCl to dissolve cellulose 2 In the aqueous solution, slowly add 10% NaOH aqueous solution dropwise, when the pH value of the system is 9, stop the dropwise addition, and let it stand for 24 hours to obtain the ZnO precursor / cellulose gel. ) put the ZnO precursor / cellulose gel into the hydrothermal synthesis kettle, and carry out the hydrothermal reaction under the conditions of pH=9 and temperature of 120°C, and the reaction time is 6h. Wash the 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 material of ZnO / cellulose gel particles is obtained.

[0035] At the same time, ZnO...

Embodiment 2

[0040] Add 1g of bamboo pulp cellulose to 65% (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. ZnCl to dissolve cellulose 2 In the aqueous solution, slowly add 5% NaOH aqueous solution dropwise, when the pH value of the system is 7, stop the dropwise addition, and let it stand for 36 hours to obtain the ZnO precursor / cellulose gel. ) Put the ZnO precursor / cellulose gel into the hydrothermal synthesis kettle, and carry out the hydrothermal reaction under the conditions of pH=7 and temperature of 170°C, and the reaction time is 4h. Wash the 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 material of ZnO / cellulose gel particles is obtained.

[0041] Depend on Figu...

Embodiment 3

[0043] Add 1 g of cotton pulp cellulose 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. ZnCl to dissolve cellulose 2 In the aqueous solution, slowly add 20% NaOH aqueous solution dropwise, when the pH value of the system is 10, stop the dropwise addition, and let stand for 48 hours to obtain ZnO precursor / cellulose gel. ) put the ZnO precursor / cellulose gel into a hydrothermal synthesis kettle, and conduct a hydrothermal reaction under the conditions of pH=10 and temperature 100°C, and the reaction time is 10h. Wash the 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 material of ZnO / cellulose gel particles is obtained.

[0044] Depend on Figure 9 It can be ...

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Abstract

The invention discloses nano ZnO / cellulose gel particles and a preparation method thereof. According to the nano ZnO / cellulose gel particles, cellulose gel is used as a core, and the outer layer is loaded with nano ZnO. According to the preparation method, 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 nano ZnO / cellulose gel particles are 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 greatly 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 relates to the technical field of nano ZnO / cellulose gel particles, in particular to a nano ZnO / cellulose gel particle and a preparation method thereof. Background technique [0002] Since Iijima's discovery of carbon nanotubes, nanomaterials have attracted great interest due to 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 Applications(China)
IPC IPC(8): B01J13/02
Inventor 李小保张雪岳双艳章伟徐璐叶菊娣洪建国李力成李宇欣
Owner NANJING FORESTRY UNIV
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