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Preparation for chitosan/titanium dioxide composite material

A technology of titanium dioxide and composite materials, which is applied in the field of preparation of chitosan/titanium dioxide composite materials, can solve the problems of composite material performance and application limitations, and achieve good photocatalytic degradation characteristics, abundant sources, and low-cost raw materials.

Inactive Publication Date: 2008-07-02
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limit the performance and application of composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 500mL of distilled water and 2mL of concentrated nitric acid and put them in a 1000mL beaker, slowly add 20mL of absolute ethanol and 2mL of butyl titanate into the above mixed solution with stirring at a rate of 0.5 drops / second. After dripping, continue to stir for 2 hours to get colloidal TiO 2 solution.

[0013] Dissolve 2 g of chitosan in 100 mL of colloidal TiO containing 4 g of acetic acid 2 In the solution, the chitosan can be evenly dispersed in the TiO by stirring 2 colloidal solution, and get a uniform chitosan / TiO 2 mixture. The mass percent of chitosan in the mixed solution is 2%, and the mass percent of titanium dioxide is 0.5%. The mixed liquid was degassed and cast on a glass plate to form a film, and solidified in 0.1M NaOH aqueous solution to form a film, and then washed the film with water to obtain chitosan / TiO 2 Composite film. The appearance of the composite film is transparent and translucent. Under sunlight irradiation, the catalytic ...

Embodiment 2

[0015] Put 500mL of distilled water and 2mL of concentrated nitric acid into a 1000mL large beaker, slowly add 30mL of absolute ethanol and 4mL of butyl titanate into the above mixed solution with stirring, at a rate of 0.5 drops / second. After dripping, continue to stir for 2 hours to get colloidal TiO 2 .

[0016] Dissolve 3 g of chitosan in 100 mL of the above colloidal TiO containing 5 g of acetic acid 2 In the solution, by stirring, the chitosan can be evenly dispersed in the TiO 2 In the colloidal solution, a uniform chitosan / TiO 2 mixture. The mass percentage of chitosan in the mixed solution is 3%. After degassing, the mixed liquid is injected into 0.1M NaOH aqueous solution with a 0.1mm syringe to solidify into fibers, and then the fibers are washed with water to obtain chitosan / TiO 2 A composite fiber having a good inhibitory effect on fungi and the like.

Embodiment 3

[0018] Take 500mL of distilled water and 3mL of concentrated nitric acid and put them in a 1000mL beaker, slowly add 30mL of absolute ethanol and 6mL of butyl titanate into the above mixed solution with stirring at a rate of 0.5 drops / second. After dripping, continue to stir for 2 hours to get colloidal TiO 2 .

[0019] Dissolve 5 g of chitosan in 100 mL of colloidal TiO containing 5 g of acetic acid 2 In the solution, by stirring, the chitosan can be evenly dispersed in the TiO 2 colloidal solution, and get a uniform chitosan / TiO 2 mixture. The mass percent of chitosan in the mixed solution is 5%. After degassing, the mixed liquid was dropped into 0.1M NaOH aqueous solution through a 0.1mm syringe to solidify into balls, and then the microspheres were washed with water to obtain chitosan / TiO 2 The composite microsphere, which can be packed into a column, has a good catalytic degradation effect on methyl orange aqueous solution under sunlight irradiation.

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Abstract

The invention discloses a preparation method of a chitosan / titanium dioxide composite material. The chitosan is dissolved in colloid titanium dioxide solution containing acetic acid or the chitosan is blended with the colloid titanium dioxide after being dissolved by the acetic acid, by stirring, the dioxide is homogeneously dispersed in TiO2 colloid solution, and homogeneous chitosan / TiO2 mixed solution is prepared. The mass weight percentage of the chitosan in the mixed solution is 1 to 10 percent, and the mass weight percentage of TiO2 is 0.5 to 20 percent; the chitosan / titanium dioxide composite material is consolidated and prepared after the mixed solution is degassed. The compound membrane prepared by the method is transparent or semitransparent. The preparation method of the invention is simple, the raw material is inexpensive, the material source is abundant, and TiO2 is distributed in the compound material at nano-size. The prepared product has wide application range, and has photocatalysis degradation characteristic on waste water of helianthine and other dye, etc. The composite material can be taken as an indoor air purifying agent, an industrial waste water treating agent, an antibacterial film, self-cleaning fiber and antibacterial fiber, etc.

Description

technical field [0001] The invention belongs to the preparation of natural polymer composite materials, in particular to the preparation of a chitosan / titanium dioxide composite material. Background technique [0002] Chitosan is the second largest natural polysaccharide after cellulose. It has good antibacterial properties, can inhibit the growth of various fungi, and has the characteristics of high sterilization rate, low toxicity and good biocompatibility. In addition, chitosan has excellent properties of film-forming, spinning and preparing microspheres (Ravi Kumar, M.N.V. Muzzarelli, R.A.A. Muzzarelli, C. et al. Chem. Rev. 2004, 104: 6017-6084). Nano-TiO 2 With a high specific surface area, it has the characteristics of high efficiency and wide catalytic range as a photocatalyst. Existing chitosan / titanium dioxide composite material is prepared as follows: application number 20041006078801, the nano-TiO 2 Powder dispersed in cellulose solution to obtain cellulose and...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K3/22
Inventor 彭湘红郑琦刘学清杜金萍刘继延陆茜王敏娟
Owner JIANGHAN UNIVERSITY
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