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Composite adsorption membrane, preparation method and application thereof

A composite adsorption and composite hydroxide technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of secondary pollution of water bodies, difficult recovery, etc., and achieve simple preparation process and heavy experimentation. good effect

Inactive Publication Date: 2019-06-07
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a composite adsorption membrane for removing fluorine in water, and a preparation method thereof, which solves the problems of recovery difficulty in the use process of existing adsorption materials and the problem of easy secondary pollution to water bodies

Method used

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  • Composite adsorption membrane, preparation method and application thereof
  • Composite adsorption membrane, preparation method and application thereof
  • Composite adsorption membrane, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 18 parts by weight of polysulfone to 73 parts by weight of N,N-dimethylformamide, and vigorously stir at 65° C. for 2 hours to obtain a transparent organic solution.

[0027] (2) Add 9 parts by weight of the layered magnesium-aluminum composite hydroxide to the above organic solution, and vigorously stir at 65° C. for 24 hours to obtain a casting solution in which the layered magnesium-aluminum composite hydroxide is uniformly dispersed.

[0028] (3) At room temperature, the above-mentioned casting solution was evenly coated on a clean glass plate, and immediately immersed in deionized water to obtain a composite film with a thickness of 150 μm, which was dried at 70° C. and stored.

[0029] (4) Weigh 0.3g of dry composite membrane and place it in 50mL of high-fluorine water with a concentration of 10mg / L; after static adsorption at 25°C for 2.5 hours, the removal rate of fluoride ion was measured to be 66.3%, and the composite membrane’s fluoride ion The equili...

Embodiment 2

[0031] (1) Add 16 parts by weight of polyethersulfone to 67 parts by weight of N,N-dimethylacetamide, and vigorously stir at 65° C. for 2 hours to obtain a transparent organic solution.

[0032] (2) Add 17 parts by weight of the layered magnesium-aluminum composite hydroxide to the above organic solution, and vigorously stir at 65° C. for 24 hours to obtain a casting solution in which the layered magnesium-aluminum composite hydroxide is uniformly dispersed.

[0033] (3) At room temperature, evenly coat the above-mentioned casting solution on a clean glass plate, and immediately immerse in deionized water to obtain a composite film with a thickness of 150 μm, dry at 70°C, and store.

[0034] (4) Weigh 0.3g of dry composite membrane and place it in 50mL of high-fluorine water with a concentration of 10mg / L; after static adsorption at 25°C for 2.5 hours, the removal rate of fluoride ion was measured to be 87.1%, and the composite membrane’s fluoride ion The adsorption amount was...

Embodiment 3

[0036] (1) Add 14 parts by weight of polyethersulfone to 57 parts by weight of N,N-dimethylformamide, and vigorously stir at 65° C. for 2 hours to obtain a transparent organic solution.

[0037] (2) Add 29 parts by weight of the layered magnesium-aluminum composite hydroxide to the above organic solution, and vigorously stir at 65° C. for 24 hours to obtain a casting solution in which the layered magnesium-aluminum composite hydroxide is uniformly dispersed.

[0038] (3) At room temperature, evenly coat the above-mentioned casting solution on a clean glass plate, and immediately immerse in deionized water to obtain a composite film with a thickness of 150 μm, dry at 70°C, and store.

[0039] (4) Weigh 0.2g of dry composite membrane and place it in 50mL of high-fluorine water with a concentration of 10mg / L; after static adsorption at 25°C for 2.5 hours, the removal rate of fluoride ion was measured to be 91.0%, and the composite membrane’s fluoride ion The adsorption capacity w...

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Abstract

The invention provides a composite adsorption film for removing fluorine in water.The composite adsorption film is prepared from, by mass, layered magnesium-aluminum composite hydroxide, a high-molecular polymer and an organic solvent.The high-molecular polymer is preferably one of polyether sulfone, polysulfone and polyvinylidene fluoride.The organic solvent is one of N,N-dimethylacetamide, N,N-dimethylformamide and N-methyl pyrrolidone.The layered magnesium-aluminum composite hydroxide is firmly inlaid in a high-molecular basement membrane, and is not prone to fall off.The composite adsorption film is applied to high-fluorine water treatment, the fluorine content can be reduced to 1 mg / L or below, and the national hygienic standard for drinking water is met.The preparation process is simple, the composite adsorption film can be machined into a film device according to needs, and industrial application can be achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a composite adsorption membrane, a preparation method and an application thereof. Background technique [0002] Fluorine is an essential trace element for the human body, but excessive intake of fluorine can cause fluorosis and endanger human health. The Hygienic Standard for Drinking Water of the People's Republic of China stipulates that the content of fluoride in drinking water shall not be higher than 1.0mg / L. Fluorine-containing water exceeding this standard is high-fluoride water. High-fluorine groundwater is widely distributed in my country, covering 27 provinces, municipalities and autonomous regions across the country. According to incomplete statistics, at least 63 million people in my country drink high-fluorine water for a long time, so my country has become one of the main high-incidence areas of endemic skeletal fluorosis in the world. [0003] At present, the trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/32C02F1/28
CPCB01J20/265B01J20/3231B01J2220/46C02F1/288C02F2101/14
Inventor 吴涛王海增毛丽莉
Owner OCEAN UNIV OF CHINA
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