Preparation method of gas purification membrane with antibacterial function

A gas purification and functional technology, applied in the field of membrane preparation and modification, to achieve the effect of large adsorption capacity, simple equipment and low energy consumption

Active Publication Date: 2014-01-29
JIANGSU JIULANG HIGH TECH CO LTD
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Problems solved by technology

[0004] (2) Adsorption and volatilization is a purifier with Chinese herbal medicine as the medium, which is cheap and has a certain antibacterial function, but Chinese herbal medicine can hardly be purified in solid state Function, the purifier uses only a small amount of Chinese herbal medicine ingredients. After reaching saturation, it will not only fail to sterilize, but also easily become a breeding body for bacteria. The replaced filter element involves the difficulty of harmless disposal.
[0005] (3) Adsorption, activated carbon filter, can absorb certain bacteria, dust and harmful gases in a short period of time, the price is low, and it can filter certain bacteria and dust. Adsorption function, but no selective adsorption, the adsorption rate of water is 45%, generally it will reach saturation after one month and needs to be replaced
The replaced filter element also involves the difficulty of harmless disposal
[0006] (4) Multi-layer filtration, mainly a composite purifier, with better filtering effect and can significantly reduce solid dust in the air, but the price is relatively high, and its filtration The device needs to be replaced after a period of use, cannot be regenerated, and has basically no effect on harmful gases
Many consumables, high cost
Replaced filter elements involve difficulties in harmless disposal
[0007] (5) Catalysis and decomposition are mainly photocatalyst purifiers, which can decompose some harmful gases, and the price is relatively low. It must rely on the irradiation of ultraviolet rays in the sun to produce effects. The use of ultraviolet lamps is easy to damage and needs to be replaced frequently. At the same time, ultraviolet rays are harmful to human bodies and plastics.
At present, the seed crystal preparation methods of ZnO nanoarrays mainly include soaking method, direct growth method without coating seed crystals, surface galvanizing method, sol-gel method, etc. These methods cannot guarantee a uniform coating on the surface of the porous membrane. The thickness of the layer is uniform and the particle size is a single zinc oxide seed crystal, so the array after growth is disordered or inconsistent in size

Method used

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  • Preparation method of gas purification membrane with antibacterial function
  • Preparation method of gas purification membrane with antibacterial function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the preparation method of the present invention is as follows: use atomic deposition instrument ALD to deposit a layer of zinc oxide film on the surface of polytetrafluoroethylene porous membrane (0.5um), the atomic deposition cycle is 200cyl, the carrier pressure is 1Torr, and the carrier gas volume is 15sccm. After 300s of high-temperature aerobic thermal annealing at 300°C, take it out after cooling, put it into a hydrothermal kettle containing 0.1Mol / L zinc acetate and 25mMol / L hexamethylenetetramine aqueous solution, place it vertically, and put the hydrothermal kettle in an oven , 90 ℃ constant temperature storage 5h, that is.

[0040]The gas purification membrane prepared in this example was measured by a scanning electron microscope S-4800, and there were linear zinc oxide crystals on the surface of the membrane (see figure 2 ). The thickness of the gas purification membrane is 0.03mM, and the pore size range is 0.1~0.5um.

[0041...

Embodiment 2

[0043] Such as figure 1 As shown, the preparation method of the present invention is as follows: use atomic deposition instrument ALD to deposit a layer of zinc oxide film on the surface of polytetrafluoroethylene porous membrane (aperture 1um), atomic deposition cycle 100cyl, carrier pressure is 0.5Torr, carrier gas volume 10sccm. After aerobic thermal annealing at a high temperature of 100°C for 300s, put it into a hydrothermal kettle containing 0.05Mol / L zinc acetate and 25mMol / L hexamethylenetetramine aqueous solution, place it vertically, and put the hydrothermal kettle in an oven at 50℃ Storing at constant temperature for 18h, that is.

[0044] The gas purification membrane prepared in this example is measured by a scanning electron microscope s-4800, and the surface of the membrane is formed with linear zinc oxide crystals, which are relatively dense (see figure 2 ). The thickness of the gas purification membrane is 0.1mM, and the pore size range is 0.5~1um.

[004...

Embodiment 3

[0047] Such as figure 1 As shown, the preparation method of the present invention is as follows: use an atomic deposition instrument ALD to deposit a layer of zinc oxide film on the surface of a polytetrafluoroethylene porous membrane (pore size 5um), the atomic deposition cycle is 300cyl, the carrier pressure is 2Torr, and the carrier gas volume is 20sccm. After aerobic thermal annealing at a high temperature of 300°C for 200s, put it into a hydrothermal kettle containing 0.1mMol / L zinc acetate and 25mMol / L hexamethylenetetramine aqueous solution, place it vertically, and put the hydrothermal kettle in an oven at 95℃ Store at constant temperature for 3h, that is.

[0048] The gas purification membrane prepared in this example is measured by s-4800, and uniform linear zinc oxide crystals are formed on the surface of the membrane, which is very dense and uniform (see figure 2 ). The thickness of the gas purification membrane is 1mM, and the pore size ranges from 1 to 5um. ...

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Abstract

The invention discloses a preparation method of a gas purification membrane with an antibacterial function. The preparation method comprises the steps of depositing a nano-scale zinc oxide thin film layer serving as a seed crystal on the surface of an expanded polytetrafluoroethylene (ePTFE) by using an atomic layer deposition (ALD) apparatus, performing quick thermal annealing, then vertically soaking a porous membrane after deposition of an atomic layer into a water heating kettle containing a crystal growth solution, and heating the water heating kettle for a period of time in a constant temperature oven to obtain a porous membrane with compact zinc oxide arrays growing on the surface. By adopting the preparation method disclosed by the invention, a porous membrane with nano zinc oxide arrays growing on the surface and in pore passages can be produced, and the membrane has effects of dust removal and disinfection; by adopting the porous membrane, the invasion of bacteria can be effectively blocked and air can pass through the porous membrane; therefore the porous membrane is an effective antibacterial gas purification membrane.

Description

[0001] technical field [0002] The invention belongs to the field of membrane preparation and modification, and in particular relates to a method for growing crystals on the surface of a porous membrane, in particular to realizing the growth of zinc oxide on the surface of a porous membrane by adopting a solution growth method. [0003] Background technique [0004] At present, there are mainly the following methods for air purification. [0005] (1) Chemical decomposition, the main working principle is an ionizer ozone generator, which is cheap and has more functions than fresheners. It can increase the number of negative ions in the air and reduce solid dust in the air. It has a bactericidal effect but has an effect on decomposing harmful gases such as formaldehyde. not big. The ozone generator produces a large amount of high-concentration ozone, which may kill human white blood cells while killing some viruses and bacteria, which may cause cancer. [0006] (2) Adsorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/36B01D69/02B01D67/00
Inventor 仲兆祥徐哲姚忠
Owner JIANGSU JIULANG HIGH TECH CO LTD
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