Nano-cellulose hydrogel film with efficient separation function as well as preparation method and application of nano-cellulose hydrogel film

A technology of nanocellulose and hydrogel, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as bridging, incomplete filtration of nanoparticles, and easy clogging

Active Publication Date: 2022-04-08
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

At present, the commonly used nanoporous film is to prepare cellulose nanopaper with nanocellulose as the basic building unit. However, when preparing cellulose nanopaper, due to the large hydrogen bonding between cellulose, the The fibers between them are tightly aggregated, easy to clog or have a "bridging" effect, resulting in incomplete filtration of nanoparticles

Method used

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  • Nano-cellulose hydrogel film with efficient separation function as well as preparation method and application of nano-cellulose hydrogel film
  • Nano-cellulose hydrogel film with efficient separation function as well as preparation method and application of nano-cellulose hydrogel film
  • Nano-cellulose hydrogel film with efficient separation function as well as preparation method and application of nano-cellulose hydrogel film

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preparation example Construction

[0031] The present invention also provides a preparation method of the nanocellulose hydrogel film described in the above technical scheme, comprising the following steps:

[0032] (1) wood powder, sodium chlorite, glacial acetic acid and water are mixed, carry out the first oxidation treatment, obtain the cellulose;

[0033] (2) Mix the cellulose, inorganic alkali and water, and perform the first alkali treatment to obtain primary purified microfibers;

[0034] (3) Mix the primary purified microfiber, sodium chlorite, glacial acetic acid and water, and perform a second oxidation treatment to obtain secondary purified cellulose;

[0035] (4) mixing the secondary purified microfibers, inorganic alkali and water, and performing a second alkali treatment to obtain purified cellulose;

[0036] (5) mixing the purified cellulose with water, and ultrasonicating to obtain a nanocellulose suspension;

[0037] (6) Injecting the nanocellulose suspension under pressure to obtain the nan...

Embodiment 1

[0067] Sieve 30g of poplar wood powder with a 60-mesh screen and pour it into a beaker, add 1500g of distilled water, 15g of sodium chlorite and 3mL of glacial acetic acid, and oxidize it in a water bath at 75°C for 5h, adding chlorite every 1h during the process Sodium nitrate 15g, glacial acetic acid 3mL, a total of 5 times, to obtain comprehensive cellulose.

[0068] After washing 15g of cellulose to neutrality with water, mix it with 40g of potassium hydroxide solution with a concentration of 5mol / L, and treat it with alkali in a water bath at 75°C for 2h to obtain primary purified microfibers.

[0069] 15g of primary purified microfibers, 15g of sodium chlorite, 1500mL of glacial acetic acid and 3mL of water were oxidized in a water bath at 75°C for 2 hours, washed until neutral, and then treated with alkali to obtain purified cellulose;

[0070] The purified cellulose was mixed with water, and then it was sonicated with an ultrasonic cell pulverizer with an ultrasonic po...

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Abstract

The invention relates to the field of preparation of hydrogel films, in particular to a nanocellulose hydrogel film and a preparation method and application thereof. The invention provides a nano-crystalline cellulose hydrogel film. The nano-crystalline cellulose hydrogel film is composed of a net-shaped entanglement structure formed by interweaving nano-crystalline cellulose and aggregates of the nano-crystalline cellulose. The porosity of the nano cellulose hydrogel film is 90 to 94 percent; the thickness of the nano cellulose hydrogel thin film is 0.01 to 0.10 [mu] m. The super-hydrophilicity and high porosity of the nanocellulose hydrogel film provided by the invention ensure that liquid can quickly pass through, and the mutually cross-linked three-dimensional network structure effectively repels nanoparticles. Nanopores of the nanocellulose hydrogel film are entangled together, and nanofibers and nanofiber bundles are small and irregular and are not matched with larger nanoparticles. Therefore, the nanopores are not blocked by the nanoparticles, and liquid can smoothly pass through the nanocellulose hydrogel film.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogel films, and in particular relates to a nanocellulose hydrogel film with high-efficiency separation function and its preparation method and application. Background technique [0002] Filtration separation is a relatively simple, fast and efficient method for separating nanoparticles, and it is expected to achieve large-scale application in industrialization. However, since the size of the filtered nano-particles is becoming finer and faster, and a faster filtration speed is required, the filter medium for filtration and separation generally adopts nanoporous membranes. At present, the commonly used nanoporous film is to prepare cellulose nanopaper with nanocellulose as the basic building unit. However, when preparing cellulose nanopaper, due to the large hydrogen bonding between cellulose, the The fibers between them are tightly aggregated, easily clogged or have a "bridging" effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/02B01D67/00C02F1/44C02F101/30C02F101/34C02F101/36C02F101/38
Inventor 陈百灵李勍陈文帅于海鹏张涵秋
Owner NORTHEAST FORESTRY UNIVERSITY
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