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A kind of nano-titanium dioxide/chitosan three-dimensional porous composite material and its preparation method

A nano-titanium dioxide and composite material technology is applied in the field of nano-titanium dioxide/chitosan three-dimensional porous composite materials and their preparation, and can solve the problems of lack of three-dimensional interconnected macroporous structure, difficult control of nanocrystalline size, high adsorption performance, etc. Easy to use widely, good mechanical properties, high porosity effect

Inactive Publication Date: 2017-08-29
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, organic titanium sources are generally used as precursors, and TiO is prepared by impregnation and roasting. 2 Modified on the surface of the adsorbent, the process is more complicated, and TiO 2 The size of nanocrystals is difficult to control and practical application
However, the above-mentioned composite materials generally have the problem of lacking a three-dimensional interconnected macroporous structure, and cannot meet the requirements of having a macroporous structure and high adsorption performance at the same time.

Method used

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  • A kind of nano-titanium dioxide/chitosan three-dimensional porous composite material and its preparation method
  • A kind of nano-titanium dioxide/chitosan three-dimensional porous composite material and its preparation method
  • A kind of nano-titanium dioxide/chitosan three-dimensional porous composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Accurately weigh 10.00 g of chitosan and place it in 250 mL of acetic acid solution with a volume fraction of 2%, stir until the chitosan is completely dissolved in the acetic acid solution, and ultrasonically remove air bubbles. Then accurately weigh 10.00 g of nano-titanium dioxide powder (with a particle size of 10-30 nm) and place it in 20.00 mL of chitosan solution, stir until the nano-titanium dioxide and chitosan solution are evenly mixed, and ultrasonically remove air bubbles.

[0030] (2) Transfer the nano-titanium dioxide / chitosan mixed slurry prepared in (1) to a 12mm×18mm (diameter×height) mold, and transfer it to a freeze dryer, under the conditions of -80°C and 1~2Pa Freeze-dry for 48 hours to obtain nano-titanium dioxide / chitosan material.

[0031] (3) Soak the nano-titanium dioxide / chitosan material prepared in step (2) in 1mol / L sodium hydroxide solution for 1h-24h, wash with deionized water until neutral, and obtain nano-titanium dioxide / chitosan t...

Embodiment 2

[0036] (1) Accurately weigh 10.00 g of chitosan and place it in 250 mL of acetic acid solution with a volume fraction of 2%, stir until the chitosan is completely dissolved in the acetic acid solution, and ultrasonically remove air bubbles. Then accurately weigh 10.00 g of nano-titanium dioxide powder (with a particle size of 20-50 nm) and place it in 10.00 mL of chitosan solution, stir until the nano-titanium dioxide and chitosan solution are evenly mixed, and ultrasonically remove air bubbles.

[0037] (2), (3) method is the same as embodiment 1, promptly gets nano-titanium dioxide / chitosan three-dimensional porous composite material, and porosity is 80%, and aperture is 50-250nm, and specific surface area is 107.49m 2 / g.

Embodiment 3

[0039] (1) Accurately weigh 10.00 g of chitosan and place it in 250 mL of acetic acid solution with a volume fraction of 2%, stir until the chitosan is completely dissolved in the acetic acid solution, and ultrasonically remove air bubbles. Then accurately weigh 20.00 g of nano-titanium dioxide powder (with a particle size of 10-30 nm) and place it in 10.00 mL of chitosan solution, stir until the nano-titanium dioxide and chitosan solution are uniformly mixed, and ultrasonically remove air bubbles.

[0040] (2), (3) method is the same as embodiment 1, obtains nano-titanium dioxide / chitosan three-dimensional porous composite material, and porosity is 80%, and aperture is 50~200nm, and specific surface area is 104.64m 2 / g.

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Abstract

The invention relates to a nano titanium dioxide / chitosan three-dimensional porous composite material and a preparation method thereof. The material is prepared from chitosan and nano titanium dioxide. The nano titanium dioxide is uniformly attached to the surface of a porous bracket of chitosan to form a porous structure which is three-dimensionally cut through. The aperture is 5-500 microns and the porosity is 10-95%. The preparation method comprises the following steps: uniformly mixing a chitosan solution with nano titanium dioxide, transferring the mixed slurry into a die, and freezing, drying and moulding to prepare a nano titanium dioxide / chitosan material; and treating by aqueous alkali and washing to neutral. Compared with the prior art, the method provided by the invention is simple, convenient to operate and environmental-friendly, and the synthesized nano titanium dioxide / chitosan three-dimensional porous composite material has relatively high porosity, large specific surface area and good capability of adsorbing and catalyzing volatile organic compounds, and has a broad application prospect in the field of adsorbing and catalyzing indoor volatile organic compounds (VOC).

Description

technical field [0001] The invention relates to the field of polymer materials, the field of inorganic non-metallic materials, and the field of indoor organic volatile gas (VOC) treatment, in particular to a nano-titanium dioxide / chitosan three-dimensional porous composite material and a preparation method thereof. Background technique [0002] Environmental pollution has intensified in recent years, posing a serious threat to ecological balance, human health, and sustainable socio-economic development. Environmental purification has received extensive attention from all over the world. Among the many pollutions, air pollution has become the focus of environmental purification due to its high fluidity, imperceptibility and difficulty in treatment. In fact, people spend more than 80% of their time indoors on average every day. Although the concentration of indoor pollutants is low, they are important factors that endanger human health due to the long exposure time. Indoor ai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01J31/38B01D53/86B01D53/44
Inventor 郭亚平雷勇曹丹丹柯勤飞徐合
Owner SHANGHAI NORMAL UNIVERSITY
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