Preparation method of functional cellulose aerogel composite material loaded with TiO2 nanoparticles

A technology of cellulose airgel and nanofibers, which is applied in the direction of airgel preparation, separation methods, chemical instruments and methods, etc., and can solve the problems of easily damaged cellulose nanofiber crosslinking, poor mechanical stability, and limited application effects, etc. problem, achieve the effect of reducing cracking, enhancing compression performance, and achieving thorough treatment

Active Publication Date: 2019-03-26
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional cellulose aerogels are formed by hydrogen bond cross-linking between cellulose nanofibers, and their mechanical properties are poor, especially in an aqueous environment, where the hydrogen bonds formed between water molecules and cellulose nanofibers are easily broken. The cross-linking between cellulose nanofibers, therefo

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  • Preparation method of functional cellulose aerogel composite material loaded with TiO2 nanoparticles
  • Preparation method of functional cellulose aerogel composite material loaded with TiO2 nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0046] CNFs-NH 2 Preparation of:

[0047] Take 100g of cellulose nanofiber aqueous dispersion with a mass content of 0.8% of cellulose nanofibers, add 0.6g to 1.2g 3,3'-dithiodipropionyl hydrazide, 137.8mg to 275.5mg EDC and 83mg ~165.4mg NHS, the pH of the system was adjusted to 6.5 with 0.1mol / L hydrochloric acid and did not change. After stirring at room temperature for 24 hours, the reaction was completed, and the cellulose nanofibers with amino groups were obtained by dialysis for 3-5 days.

Embodiment 2

[0049] Preparation of CNFs-CHO:

[0050] Weigh 1g to 5g of shredded filter paper and put it into a sulfuric acid solution with a mass fraction of 64%. The dispersion system is placed in an environment of 45°C for 30 to 60 minutes of hydrolysis reaction, and then washed with ultrapure water until the pH does not change to obtain fibers cellulose nanofibril crystals, dispersing cellulose nanofibril crystals in water to obtain a cellulose nanofibril crystal dispersion liquid with a mass content of 0.5-2%, adding sodium periodate to the dispersion system and oxidizing at room temperature to obtain a cellulose nanofibril crystal with two CNCs-CHO with an aldehyde group; the mass ratio of filter paper to sulfuric acid solution is 1:10, and the mass ratio of cellulose nanofibril crystals to sodium periodate is 1:2.

Embodiment 3

[0052] A method for preparing functional cellulose airgel, dispersing cellulose nanofibers with amino groups and CNCs-CHO with two aldehyde groups in water to obtain CNFs-NH 2 dispersion and CNFs-CHO dispersion; 5mL CNFs-NH 2 Stir mechanically with 5mL CNFs-CHO under the same mass fraction (2wt%) to make it evenly mixed. After mixing evenly, let it stand for 5 hours to increase the degree of chemical cross-linking in the airgel and age it, and then freeze-dry for 48 Hours, the functional cellulose airgel was obtained.

[0053] The adsorption and degradation performance of the composite material on organic pollutants in the air was determined, and the functional cellulose airgel was placed in an atmosphere of formaldehyde to make it absorb formaldehyde in the air, and the mass change of the cellulose airgel was used to characterize the gas For the adsorption capacity of the gel to formaldehyde, the mass of the functional cellulose airgel is 0.1228g, and after the adsorption ti...

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Abstract

The invention relates to a preparation method of a functional cellulose aerogel. The method comprises the following steps: generating an acyl hydrazone bond and introducing chemical crosslinking intoaerogel to prepare the functional cellulose aerogel composite material with high mechanical properties. The chemical crosslinking is introduced on the basis of traditional cellulose aerogel, so that the crosslinking degree between cellulose nano-fibers is increased; the compression performance of the cellulose aerogel and the shape keeping performance in a water environment are enhanced and the cracking caused by the fact that a hydrogen bond is damaged in a water environment is reduced; the mechanical properties of the aerogel are improved and the actual applicability of the aerogel is widened; the TiO2 nanoparticles with photocatalytic activity are doped through a suitable method to prepare the functional cellulose composite aerogel with wider applicability, and adsorption and degradation of organic dyestuffs in the atmosphere and a water body are realized.

Description

technical field [0001] The invention relates to a loaded TiO 2 The invention relates to a preparation method of functional cellulose airgel composite material of nanoparticles, which belongs to the technical field of cellulose airgel. Background technique [0002] In recent years, the problem of environmental pollution has been paid more and more attention by people, among which water pollution and air pollution are particularly serious. Among the many treatment methods, the adsorption method has become the most frequently used treatment method for water pollution and air pollution because of its low economic cost, remarkable effect, and simple operation. The adsorption method is to use the porous structure of the adsorbent itself or the special functional groups on the surface of the substance to adsorb harmful substances in the water body and the atmosphere on the adsorbent by physical or chemical methods to achieve the effect of removal. [0003] At present, a large num...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/24B01J20/28B01J20/30C02F1/28C02F1/32B01D53/86B01D53/44B01D53/02C02F101/30
CPCB01D53/007B01D53/02B01D53/8687B01J13/0091B01J20/24C02F1/286C02F1/32B01J20/28011B01J20/28047B01J20/3085C02F2305/10C02F2101/308B01D2259/804B01J2220/4825
Inventor 李英张雪洁
Owner SHANDONG UNIV
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