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A kind of ZNO nano sheet regenerated cellulose film composite material and preparation method thereof

A thin-film composite material and regenerated cellulose technology, applied in chemical instruments and methods, water treatment of special compounds, organic compound/hydride/coordination complex catalysts, etc., can solve limited applications, high density of inorganic carriers, and environmental friendliness Poor performance and other problems, to achieve the effect of improving difficult recycling, improving high-value utilization, and making the preparation process clean and environmentally friendly

Active Publication Date: 2020-09-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commonly used inorganic carriers include silica, diatomaceous earth, alumina, carbon materials, etc. Inorganic carriers have the characteristics of high density (generally only suitable for fixed bed reactors), which limits their application in photocatalytic engineering; Organic polymer carriers include polyethylene, etc., which have a low density and are not only suitable for fixed-bed reactors, but also for suspended-bed reactors. However, petroleum-based polymers are not easy to degrade and regenerate, and have poor environmental friendliness. Obviously, they cannot fully meet the needs of use.

Method used

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  • A kind of ZNO nano sheet regenerated cellulose film composite material and preparation method thereof
  • A kind of ZNO nano sheet regenerated cellulose film composite material and preparation method thereof
  • A kind of ZNO nano sheet regenerated cellulose film composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 2g of wood pulp cellulose fibers were added to 80g of 65% (wt%) ZnCl 2 In aqueous solution, pretreatment in a low-temperature bath at -10°C for 4 hours. 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. Put the solution on a plastic flat plate, make a 500 μm thin sheet with a film scraper, put it in 50% NaOH aqueous solution, and let it stand for 9 hours. Take out the film and wash it with distilled water until there is no Cl - , 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 nanosheet regenerated cellulose film is obtained. The characterization results are as follows Figure 1~4 shown. Depend on figure 1 It can be seen that the prepared thin film new material has better morphology. Depend on figure 2 It can be seen that the thickness of the ZnO nanosheets is about 50 nm, and...

Embodiment 2

[0028] 2g of wood pulp cellulose fibers were added to 120g of 70% (wt%) ZnCl 2 In aqueous solution, pretreatment in a low-temperature bath at 10°C for 2 hours. 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. Put the solution on a plastic flat plate, make a 250 μm thin sheet with a film scraper, put it in 50% NaOH aqueous solution, and let it stand for 6 hours. Take out the film and wash it with distilled water until there is no Cl - , 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 nanosheet regenerated cellulose film is obtained. The thickness of the ZnO nanosheets is about 40nm, and the side length is about 400nm.

Embodiment 3

[0030] 2g bamboo pulp cellulose fiber is added to the ZnCl of 60g 65% (wt%) 2 In aqueous solution, pretreatment in a low-temperature bath at 0°C for 3 hours. 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. Put the solution on a plastic flat plate, make a 1000 μm thin sheet with a film scraper, put it in 50% NaOH aqueous solution, and let it stand for 4 hours. Take out the film and wash it with distilled water until there is no Cl - , 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 nanosheet regenerated cellulose film is obtained. The thickness of the ZnO nanosheets is about 20nm, and the side length is about 200nm.

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Abstract

The invention discloses a ZnO nanosheet regenerated cellulose film composite material and a preparation method thereof. In this composite material, the side length of the ZnO nanosheets is 200-500 nm, the sheet thickness is 20-50 nm, and the thickness of the regenerated cellulose film is 250-1000 μm. This preparation method is based on ZnCl 2 The aqueous solution is used as the solvent of cellulose and the zinc source of nano-ZnO, and the dissolved pulp cellulose fiber is used as the raw material of cellulose. Through low-temperature pretreatment, dissolution, scraping, in-situ synthesis and freeze-drying, a ZnO nanosheet regenerated cellulose film composite is prepared. Material. The material is easy to recycle, has high photocatalytic efficiency, can effectively shorten the adsorption time of methyl orange, and has good practicality.

Description

technical field [0001] The invention belongs to the technical field of new cellulose materials, and in particular relates to a ZnO nano sheet regenerated cellulose film composite material and a preparation method thereof. Background technique [0002] Compared with traditional sewage treatment technology, photocatalytic technology has the advantages of high efficiency, energy saving, easy operation, simplified process, clean and non-toxic, and no secondary pollution. Some commonly used photocatalytic materials are mainly semiconductor materials, and nano-ZnO is one of the materials with broad application prospects. However, it is difficult to recycle in application, so it needs to be compounded with a certain carrier to improve its utilization efficiency. [0003] At present, commonly used inorganic carriers include silica, diatomaceous earth, alumina, carbon materials, etc. Inorganic carriers have the characteristics of high density (generally only suitable for fixed bed r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J35/06C02F1/32
CPCC02F1/32B01J31/26C02F2305/10B01J35/59B01J35/39
Inventor 李小保周小龙高亚年李力成叶菊娣
Owner NANJING FORESTRY UNIV
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