Flexible porous composite material doped with piezoelectric catalytic material and preparation thereof

A technology of porous composite membrane and photocatalytic material, applied in the field of piezoelectric catalysis and air purification, can solve the problems of easy saturation and low electric field, and achieve the effects of high ventilation, degradation of organic pollutants, and high flexibility

Active Publication Date: 2021-02-19
NANJING XIAOZHUANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The flexible porous composite membrane material of the present invention has high flexibility, high porosity and high air flow, wherein the doped and loaded piezoelectric catalyst can utilize pore airflow, etc. Air vibration energy and film vibration form a piezoelectric effect and can be combined with photocatalysts at high density, which overcomes the shortcomings of existing piezoelectric photocatalysts t...

Method used

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  • Flexible porous composite material doped with piezoelectric catalytic material and preparation thereof

Examples

Experimental program
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Effect test

preparation example 1

[0090] Preparation of lead zirconate titanate powder doped with titanium oxide

[0091] Disperse 40.5g of lead zirconate titanate powder in 1800mL of absolute ethanol, ultrasonically disperse for 20 minutes, then add 200mL of concentrated ammonia water, stir evenly, gradually add 175mL of tetrabutyl titanate dropwise, and transfer the mixture to a stainless steel sealed hydrothermal kettle , stirred and reacted in an oil bath at 120°C for 24h. After washing and drying, it was calcined in a muffle furnace at 520°C for 3 hours, and then it was ground into powder by nanometer, so as to obtain lead zirconate titanate powder doped with titanium oxide.

preparation example 2

[0093] Preparation of graphene-modified zinc oxide / cadmium sulfide / lead zirconate titanate composite slurry

[0094] 1) Weigh cadmium sulfide and zinc oxide composite powders with a mass ratio of 1:10, disperse them with a nano-graphene-ethanol solution with a graphene mass fraction of 3wt%, and control the mass ratio of the composite powders to the dispersion to be 1 :8, obtain zinc oxide / cadmium sulfide dispersion liquid;

[0095] 2) Add 22g of the above-mentioned zinc oxide / cadmium sulfide dispersion to a ball milling reactor with a polytetrafluoroethylene liner, then add 18g of the titanium oxide-doped lead zirconate titanate powder prepared in Preparation Example 1 above, 2g of acrylamide , 0.8g N,N'-dihydroxyethylbisacrylamide, and 0.5g sodium polyacrylate, after mixing evenly, use 8-9ml deionized water to adjust the viscosity, and perform mixing ball milling for 2 hours to obtain a low-viscosity suspension mixed slurry, That is, graphene-modified zinc oxide / cadmium sul...

preparation example 3

[0097] Preparation of silver-doped bismuth titanate

[0098] Weigh 1.45g of AgNO 3 Bi with 1g 4 Ti 3 o 12 Add the powder into 500ml of deionized water, ultrasonically oscillate for 10min, add dropwise NaOH solution with a volume of 50ml and a molar concentration of 2mol / L under stirring, react to form a dark gray precipitate and let it stand for 30min, centrifuge, wash and dry Dry to obtain flake Ag with a thickness of about 50nm 2 O / Bi 4 Ti 3 o 12 Powder (length and width 200-500nm).

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Abstract

The invention discloses a reticular composite membrane matrix with a porous structure and a preparation method thereof. The reticular composite membrane matrix is prepared by melting, homogenizing andfoaming a composite polymer and a composite filler and then carrying out directional longitudinal and transverse hot melt spinning. The invention further discloses a flexible porous composite membrane material based on the composite membrane matrix and doped with a piezoelectric photocatalytic material and preparation of the flexible porous composite membrane material, the obtained flexible porous composite membrane material has high flexibility, high porosity and high ventilation capacity, and the doped and loaded piezoelectric catalyst can form a piezoelectric effect; the catalytic performance of the photocatalyst under the indoor weak light condition is improved, organic pollutants are effectively degraded, and bacteria resistance and virus killing are achieved; and the film combiningmaterial has excellent mechanical properties, and can tolerate vibration generated by high-frequency airflow for a long time.

Description

technical field [0001] The invention relates to a piezoelectric catalytic membrane material for air purification, in particular to a flexible piezoelectric catalytic composite membrane with a porous structure, a preparation method and its application in purifying air, belonging to piezoelectric catalytic and air purification technologies field. Background technique [0002] In recent years, semiconductor photocatalysts have been widely used in sewage treatment and water splitting to produce hydrogen, and have gradually received attention in air pollution, especially indoor air purification, antibacterial and antivirus. For example, photocatalytic materials such as ZnO and TiO2 are widely used in air purification, antibacterial deactivation and other fields. [0003] For indoor pollutants, particulate matter can usually be adsorbed by air purifiers with filter elements, but the physical adsorption effect of gaseous pollutants, virus bacteria microorganisms and organic pollut...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/38B01J35/00B01J35/06B01J35/10B01J37/02B01D53/86B01D53/72B01D53/44
CPCB01J37/024B01J35/004B01J35/065B01J35/10B01J31/06B01J31/38B01D53/007B01D53/8668B01D53/8687B01D2259/802Y02C20/30
Inventor 张敦谱丁明烨万轶张辉
Owner NANJING XIAOZHUANG UNIV
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