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Antibacterial composite nanofiltration membrane, and preparation method and application thereof

A composite nanofiltration membrane and nano-silver technology, applied in the field of membrane separation, can solve problems such as microbial contamination, non-killing, and reduced membrane characteristics, and achieve good antibacterial performance, simple and energy-saving preparation process, and improved antibacterial performance.

Inactive Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can greatly improve the performance of anti-inorganic pollution and anti-organic pollution of the composite membrane, because they do not have the function of killing the attached bacteria and inhibiting their reproduction, they can inhibit the pollution caused by biological sources or caused by it. The effect of reducing the membrane characteristics caused by secondary pollution, etc. is poor
[0005] At present, the research on anti-microbial fouling of nanofiltration membranes is still in its infancy.
Microbial contamination is still the most common and serious problem in the application of nanofiltration membranes, which seriously affects the application and promotion of nanofiltration membranes

Method used

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  • Antibacterial composite nanofiltration membrane, and preparation method and application thereof
  • Antibacterial composite nanofiltration membrane, and preparation method and application thereof
  • Antibacterial composite nanofiltration membrane, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The specific steps for the preparation of attapulgite-nano silver composite inorganic antibacterial agent in the present embodiment are as follows: (1) take the attapulgite (AT) through thermal activation and dispersion treatment, and prepare attapulgite mass concentration into water with a mass concentration of 1%. suspension, (2) and silver nitrate solution (AgNO 3 / AT=17 / 100) into the attapulgite suspension, at 50°C, magnetically stirred for 1h, (3) spray-dry the attapulgite suspension at 200°C, and collect the obtained Composite powder, (4) Finally, calcining the obtained composite powder in a muffle furnace at 500° C. for 5 minutes to obtain attapulgite-nanometer silver composite inorganic antibacterial agent. The above-mentioned composite powder prepared by spray drying and the composite powder obtained after calcination were characterized by XRD and TEM respectively, and the results showed that the silver in the composite powder after spray drying was formed as A...

Embodiment 2

[0054] The specific steps for the preparation of attapulgite-nanometer silver composite inorganic antibacterial agent in the present embodiment are as follows: (1) take the attapulgite (AT) through thermal activation and dispersion treatment, and add distilled water to prepare attapulgite with a mass concentration of 5 % suspension, (2) then silver nitrate solution (AgNO 3 / AT=135 / 100) into the attapulgite suspension, at 90°C, magnetically stirred for 3h, (3) spray-dry the attapulgite suspension at 170°C, and collect the composite powder, (4) Finally, calcining the obtained composite powder at 400° C. for 15 minutes to obtain attapulgite-nanometer silver composite inorganic antibacterial agent. The above-mentioned composite powder prepared by spray drying and the composite powder obtained after calcination were characterized by XRD and TEM respectively, and the results showed that the silver in the composite powder after spray drying was formed as Ag 2 CO 3 form, and decompo...

Embodiment 3

[0057] In the present embodiment, the preparation steps of attapulgite-nano-silver composite inorganic antibacterial agent are as follows: (1) Weigh the attapulgite (AT) through thermal activation and dispersion treatment, and add distilled water to prepare attapulgite with a mass concentration of 10%. suspension, (2) and silver nitrate solution (AgNO 3 / AT=170 / 100) into the attapulgite suspension, stirred at 60°C for 1 hour, (3) spray-dried the attapulgite suspension at 150°C, and collected the composite powder obtained by spray drying , (4) Finally, calcining the obtained composite powder at 200° C. for 180 minutes to obtain attapulgite-nanometer silver composite inorganic powder. The above-mentioned composite powder prepared by spray drying and the composite powder obtained after calcination were characterized by XRD and TEM respectively, and the results showed that the silver in the composite powder after spray drying was formed as Ag 2 CO 3 form, and decomposes into Ag ...

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Abstract

The invention relates to an antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane comprises a porous supporting layer and a polyamide functional layer, wherein the polyamide functional layer comprises attapulgite-nanometer silver composite inorganic powder; and in the attapulgite-nanometer silver composite inorganic powder, the mass ratio of silver to attapulgite is 10 / 100 to 100 / 100, and the particle size of the nanometer silver is 3 to 100 nm. The invention also relates to a preparation method and an application of the above-mentioned antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane provided by the invention has the advantages of high flux, high rejection rate, good antibacterial properties, stable membrane structure, high operation efficiency and long service life.

Description

technical field [0001] The invention relates to the technical field of membrane separation, and more specifically relates to an antibacterial nanofiltration composite membrane. The invention also relates to the preparation method and application of the antibacterial nanofiltration composite membrane. Background technique [0002] Nanofiltration membrane is a new type of separation membrane with a pore size between reverse osmosis membrane and ultrafiltration membrane. Due to its nanoscale membrane pore size and multiple charges on the membrane, it allows low molecular salts to pass through and intercepts higher molecular weight salts. Organic matter and multivalent ions, with unique separation performance and higher separation accuracy. Compared with other separation membranes, nanofiltration membranes have the characteristics of larger membrane flux, low process osmotic pressure, selective separation of ions, low operating pressure, and low power requirements of the system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/56B01D69/02
Inventor 刘轶群史元腾潘国元张杨严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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