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Calcium alginate composite filter membrane and preparation method and application thereof

A technology of calcium alginate and sodium alginate, applied in the field of separation membrane, 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 high water flow and strong anti-fouling ability

Active Publication Date: 2019-09-13
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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  • Calcium alginate composite filter membrane and preparation method and application thereof
  • Calcium alginate composite filter membrane and preparation method and application thereof
  • Calcium alginate composite filter membrane and preparation method and application thereof

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, let stand for 12-24h to remove air bubbles, and 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 12-24 ho...

Embodiment 2

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

[0051] S1: Mix 0.075g sodium alginate with 50ml 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 0.15wt%;

[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 and dry it for 12-24 hou...

Embodiment 3

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

[0057] S1: Mix 0.1 g of sodium alginate with 50 ml 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 0.2 wt %;

[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...

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Abstract

The invention discloses a preparation method of a calcium alginate composite filter membrane. The preparation method comprises the steps: mixing sodium alginate and deionized water at a certain ratio,stirring the mixture, then performing still standing so as to remove bubbles and obtain a sodium alginate solution, soaking filter paper in the sodium alginate solution for a certain period of time so as to obtain sodium alginate filter paper, performing freeze drying on the sodium alginate filter paper under certain conditions so as to obtain a sodium alginate modified membrane, soaking the sodium alginate modified membrane in a calcium chloride solution for a certain period of time, taking out the soaked membrane, and performing drying so as to obtain the calcium alginate composite filter membrane. Through the synergistic effect among the steps of the preparation method, the produced sodium alginate composite filter membrane has a high water flow capacity and high anti-staining ability,and green and environment-friendly sodium alginate is adopted, materials are inspired by natural organisms, no intermediate impurities are produced during the whole preparation, and the method is environmentally friendly, and has resistance 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 Applications(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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