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A kind of calcium alginate composite filter membrane, its preparation method and application

A technology of calcium alginate and sodium alginate, applied in the field of separation membranes, can solve the problems of high cost, secondary pollution of the environment, poor anti-fouling ability of the hydration layer, etc., and achieve the effect of strong anti-fouling ability and high water flow

Active Publication Date: 2021-12-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a calcium alginate composite filter membrane and a preparation method thereof, which are used to solve problems in the prior art: the hydration layer on the membrane surface of the existing filter membrane has poor anti-fouling ability, and the surface of the produced membrane has anti-fouling ability The membrane equipment is relatively fine, the cost is high, and it is easy to produce intermediate products, which is easy to cause technical problems of secondary pollution of the environment

Method used

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  • A kind of calcium alginate composite filter membrane, its preparation method and application
  • A kind of calcium alginate composite filter membrane, its preparation method and application
  • A kind of calcium alginate composite filter membrane, its preparation method and application

Examples

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Embodiment 1

[0044] A preparation method for a calcium alginate composite filter membrane, comprising the following steps:

[0045] S1: Mix 0.05g of sodium alginate with 50ml of deionized water, stir for 0.5-1h, and let it stand for 12-24h to remove air bubbles to obtain a sodium alginate solution with a concentration of 0.1wt%.

[0046] S2: Soak a square filter paper with a side length of 3cm in the sodium alginate solution for 4-5 hours, stir for 0.5-1 hour, and let it stand for 12-24 hours to remove air bubbles to obtain uniform sodium alginate filter paper. Place the sodium alginate filter paper on- Freeze-drying at 45°C for 24 hours to obtain a sodium alginate modified membrane;

[0047] S3: Mix anhydrous calcium chloride and deionized water according to the mass ratio of 1-10:20, and stir for 0.5-1 hour to obtain a calcium chloride solution;

[0048] S4: Soak the sodium alginate modified membrane in calcium chloride solution for 4-4.5 hours at 25-30° C., take it out and dry it for 1...

Embodiment 2

[0050] A preparation method for a calcium alginate composite filter membrane, comprising the following steps:

[0051] S1: Mix 0.075g of sodium alginate with 50ml of deionized water, stir for 0.5 to 1 hour, and let stand for 12 to 24 hours to remove air bubbles to obtain a sodium alginate solution with a concentration of 0.15wt%;

[0052] S2: Soak a square filter paper with a side length of 3cm in the sodium alginate solution for 4-5 hours, stir for 0.5-1 hour, and let it stand for 12-24 hours to remove air bubbles to obtain uniform sodium alginate filter paper. Place the sodium alginate filter paper on- 55 ℃ ~ 60 ℃, freeze-drying for 12 hours to obtain sodium alginate modified membrane;

[0053] S3: Mix anhydrous calcium chloride and deionized water according to the mass ratio of 1-10:20, and stir for 0.5-1 hour to obtain a calcium chloride solution;

[0054] S4: Soak the sodium alginate modified membrane in calcium chloride solution for 4-4.5 hours at 25-30° C., take it out...

Embodiment 3

[0056] A preparation method for a calcium alginate composite filter membrane, comprising the following steps:

[0057] S1: Mix 0.1g of sodium alginate with 50ml of deionized water, stir for 0.5-1h, let stand for 12-24h to remove air bubbles, and obtain a sodium alginate solution with a concentration of 0.2wt%;

[0058] S2: Soak a square filter paper with a side length of 3cm in the sodium alginate solution for 4-5 hours, stir for 0.5-1 hour, and let it stand for 12-24 hours to remove air bubbles to obtain uniform sodium alginate filter paper. Place the sodium alginate filter paper on- 30°C, freeze-drying for 10 hours to obtain sodium alginate modified membrane;

[0059] S3: Mix anhydrous calcium chloride and deionized water according to the mass ratio of 1-10:20, and stir for 0.5-1 hour to obtain a calcium chloride solution;

[0060] S4: Soak the sodium alginate modified membrane in calcium chloride solution for 4-4.5 hours at 25-30° C., take it out and dry it for 12-24 hours...

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Abstract

The invention discloses a preparation method of a calcium alginate composite filter membrane, comprising mixing sodium alginate and deionized water in a certain proportion, stirring the mixture, and then standing to remove air bubbles to obtain a sodium alginate solution; soaking the filter paper After a certain period of time in the sodium alginate solution, the sodium alginate filter paper is obtained, and the sodium alginate filter paper is freeze-dried under certain conditions to obtain a sodium alginate modified membrane, and the sodium alginate modified membrane is soaked in calcium chloride solution After a certain period of time, it is taken out and dried to obtain a calcium alginate composite filter membrane. The synergistic effect between the various steps of the preparation method enables the produced sodium alginate composite filter membrane to have a higher water flow rate and strong anti-fouling ability. Materials, no more intermediate impurities will be produced in the whole preparation process, which is environmentally friendly and resistant to harsh environments.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a calcium alginate composite filter membrane, its preparation method and application. Background technique [0002] With frequent oil recovery activities and petrochemical industry bringing serious wastewater problems, the treatment of oily wastewater has been one of the focuses of research. [0003] Usually wastewater is a complex system, metal ions and organic pollutants can exist at the same time. In practice, the separation of emulsions is a difficult problem, especially in the presence of stable surfactants. [0004] Usually the hydration layer on the surface of the filter membrane can protect the surface from contact and adhesion of oil droplets, making the filter membrane antifouling. The stronger the degree of hydration, the better the anti-fouling function. Typical materials with excellent hydration capabilities usually include polyelectrolytes and hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/08C02F1/44
CPCB01D67/0079B01D69/12B01D71/08C02F1/44
Inventor 何毅王宇琪范毅钟菲殷祥英余昊李振宇
Owner SOUTHWEST PETROLEUM UNIV
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