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Antibacterial reverse-osmosis composite membrane as well as preparation method and application thereof

A reverse osmosis composite membrane and technology of reverse osmosis membrane, which are applied to antibacterial reverse osmosis composite membrane, its preparation and application fields, can solve the problems of high equipment requirements, long time consumption, complicated process, etc., and achieve good antibacterial effect and good dispersibility. , good antibacterial properties

Active Publication Date: 2017-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method is suitable for use when the requirements for the shape of silver particles are not high, but it requires high equipment, takes a long time, and the production cost is also high
The biological method takes a long time and the yield is low, the particle size and shape of the generated particles are not easy to control, and the source of raw materials is greatly limited
The chemical method is currently the most commonly used method for preparing nano-silver, but the prepared nano-silver is easy to agglomerate, so it is often necessary to add an appropriate amount of stabilizer, and this method is complicated in process, and the release agent needs to be removed before use, and there is also environmental pollution
[0005] At present, microbial contamination is still the most common problem in the application of reverse osmosis composite membranes, which seriously affects the application and promotion of reverse osmosis composite membranes.

Method used

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  • Antibacterial reverse-osmosis composite membrane as well as preparation method and application thereof
  • Antibacterial reverse-osmosis composite membrane as well as preparation method and application thereof
  • Antibacterial reverse-osmosis composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1 prepares antibacterial reverse osmosis composite membrane according to the following steps:

[0063] Preparation of attapulgite / silicon dioxide-nano-silver composite particles: Weigh a certain amount of attapulgite (AT) through thermal activation and dispersion treatment, and prepare attapulgite with a mass concentration of 1% water suspension, and then Silver nitrate solution according to (AgNO 3 / AT=17 / 100) was added to the attapulgite suspension, and stirred by magnetic force for 10 hours at 50°C. A certain amount of silica sol (produced by Qingdao Chemical Plant, brand ZA-25, SiO 2 Concentration of 25wt%, particle size of about 10 to 20nm, pH value of about 7) diluted with deionized water to a mass concentration of 1% and then added to the heat-treated attapulgite suspension, wherein the dry attapulgite and silicon dioxide The weight ratio is 100 / 5, stirred with a laboratory high-shear dispersing emulsifier at 10,000 rpm for 30 minutes, then sprayed i...

Embodiment 2

[0066] Embodiment 2 prepares antibacterial reverse osmosis composite membrane according to the following steps:

[0067] Preparation of attapulgite / silicon dioxide-nano-silver composite particles: Weigh a certain amount of attapulgite that has been heat-activated and dispersed, add distilled water to prepare a suspension with a mass concentration of attapulgite of 10%, and then add silver nitrate Solution according to (AgNO 3 / AT=17 / 100) was added to the attapulgite suspension, and stirred for 1 hour at 90°C. A certain amount of silicon dioxide powder (Shenyang Chemical Industry Co., Ltd., the particle size range is 10-30nm) is mixed with deionized water to prepare a mass concentration of 10%, and it is dispersed through a high-shear disperser (same as Example 1) to obtain a stable suspension. Get the silicon dioxide suspension obtained by dispersing heat and heat-treated attapulgite suspension and mix them according to the proportioning ratio of 5 / 100 of their respective dr...

Embodiment 3

[0070] Embodiment 3 prepares antibacterial reverse osmosis composite membrane according to the following steps:

[0071] Preparation of attapulgite / silicon dioxide-nano-silver composite inorganic antibacterial agent: Weigh a certain amount of attapulgite that has been heat-activated and dispersed, add distilled water to prepare a suspension with a mass concentration of attapulgite of 10%, and then put Silver nitrate solution according to (AgNO 3 / AT=17 / 100) was added to the attapulgite suspension, and stirred for 5 hours at 70°C. A certain amount of silicon dioxide powder (Shenyang Chemical Industry Co., Ltd., the particle size range is 10-30nm) is mixed with deionized water to prepare a mass concentration of 5%, and is dispersed by a high-shear disperser (same as Example 1) to obtain a stable suspension. Take the dispersed silicon dioxide suspension and mix it with the heat-treated attapulgite suspension according to the ratio of 5 / 100 of their dry weight, and carry out she...

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Abstract

The invention relates to an antibacterial reverse-osmosis composite membrane. The antibacterial reverse-osmosis composite membrane comprises a reverse osmosis membrane and a high-molecular crosslinking coating layer, wherein an antibacterial agent in the high-molecular crosslinking coating layer is attapulgite / silicon dioxide-nanosilver composite inorganic powder, the mass ratio of nanosilver to attapulgite is (10 to 100)-(100 to 100), and the mass ratio of silicon dioxide to attapulgite is (3 to 100)-(30 to 100). The invention further relates to the preparation method and application of the antibacterial reverse-osmosis composite membrane. The antibacterial reverse-osmosis composite membrane is good in antibacterial performance and stable in structure.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to an antibacterial reverse osmosis composite membrane. The present application also relates to the preparation method and application of the antibacterial reverse osmosis membrane. Background technique [0002] The advanced nature and economic, environmental and social benefits of reverse osmosis membrane separation technology have been confirmed by the actual operation results of a large number of reverse osmosis projects. The core of reverse osmosis membrane separation technology is a high-performance composite reverse osmosis membrane. For a long time, the problem of membrane fouling has plagued the development of reverse osmosis membrane technology. The occurrence of pollution has led to frequent chemical cleaning of the membrane during the operation of the reverse osmosis system, and frequent cleaning will reduce the service life of the reverse osmosis membrane element and...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/08B01D69/02B01D67/00B01D61/02B01D71/02
CPCB01D61/025B01D67/0079B01D69/02B01D69/08B01D69/12B01D71/02B01D2323/30B01D2325/48
Inventor 刘轶群秦龙鑫潘国元张杨严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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