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Composite forward osmosis membrane and preparation method thereof

A technology of forward osmosis membrane and membrane material, which is applied in the field of composite forward osmosis membrane and its preparation, can solve the problem of low membrane flux, achieve high salt interception rate, stable and reliable preparation method, and improve the effect of water flux

Inactive Publication Date: 2016-07-20
中科检测技术服务(嘉兴)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the forward osmosis membrane is still in the research and development stage. At present, only the American Hydration Technology Innovations (HTI) company in the world can commercially produce the cellulose acetate forward osmosis membrane, but the application process is still limited by the pH condition of the treatment solution, and the membrane flux is low.

Method used

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  • Composite forward osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Surface modification of boron carbide nanotubes:

[0039] Use ammonium oleate aqueous solution as anionic surfactant, mix at a ratio of 4 mg nanotubes per 1 ml of surfactant, ultrasonically disperse for 3 hours, filter and dry at 80 degrees Celsius

[0040] Prepare the composite forward osmosis membrane according to the following steps:

[0041] 1) Pretreatment of nanotube materials:

[0042] The nanotube material was mixed with a 0.01 mol / L silver nitrate solution, and then a reducing agent was added and heated and stirred at 40°C for 6 hours, cooled to room temperature, filtered, and dried at 40-60°C.

[0043] 2) Pretreatment of support materials;

[0044] Soak the support material with an alkaline solution of pH 12, sonicate for 60 minutes, then rinse with deionized water and dry;

[0045] 3) Prepare membrane solution:

[0046] In terms of weight percentage, 2% nanotube material and 20% cellulose triacetate are added to a mixed solvent of 55% 1,4-dioxane, 12% acetone, 6% methanol...

Embodiment 2

[0051] Surface modification of titanium dioxide nanotubes:

[0052] After mixing 1 gram of nanotube powder and 10 ml of phenyl dichloride phosphate, ultrasonically disperse for 30 minutes, then pass in nitrogen, reflux at 90 degrees Celsius for 5 hours, keep stirring, and then slowly add excess Deionized water was filtered to obtain a solid product. After the solid product was obtained, in order to remove the excess phenyl dichloride phosphate, the product was placed in a Soxhlet extractor, and tetraoxyfuran was used as a solvent to extract the solid The product was produced for 36 hours and dried at 80 degrees Celsius.

[0053] Prepare the composite forward osmosis membrane according to the following steps:

[0054] 1) Pretreatment of nanotube materials:

[0055] The nanotube material was mixed with a 0.01 mol / L silver nitrate solution, and then a reducing agent was added and heated and stirred at 40°C for 6 hours, cooled to room temperature, filtered, and dried at 40-60°C.

[0056] ...

Embodiment 3

[0064] Surface modification of carbon nanotubes:

[0065] The nitric acid solution with a concentration of 3mol / L is added to a three-necked flask containing carbon nanotubes, and after mixing and uniformity, it is fixed to a water bath device heated to 80 degrees Celsius in advance, and the condensed water and electric stirring device are turned on. Time, turn off the electric stirring and water bath equipment power supply, cool to room temperature, suction filter the reaction product, wash with distilled water to neutral, get the upper black solid, and then put the upper black solid into the drying box to dry for 24 hours, get the carboxylated carbon nano Tube for use.

[0066] Prepare the composite forward osmosis membrane according to the following steps:

[0067] 1) Pretreatment of nanotube materials:

[0068] The nanotube material was mixed with a 0.01 mol / L silver nitrate solution, and then a reducing agent was added and heated and stirred at 40°C for 6 hours, cooled to room t...

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Abstract

The invention provides a composite forward osmosis membrane. The composite forward osmosis membrane is prepared by compounding a membrane material and a supporting material; the membrane material is mainly formed by compounding a nano silver-loaded nanotube material and cellulose triacetate; the nanotube material is selected from one or more of boron carbide nanotube with hydrophilic groups, titanium dioxide nanotube with super hydrophilicity, and carboxylic carbon nanotube with hydrophilic groups. The composite forward osmosis membrane can improve the water flow rate, achieves high salt rejection capability, and has antibacterial effect. The invention further provides a preparation method of the composite forward osmosis membrane. The method comprises the following steps: firstly performing surface modification on the nanotube materials, and introducing hydrophilic groups; secondly, loading nano silver on the nanotube materials subjected to surface modification; thirdly, pretreating a supporting material; fourthly, preparing a membrane solution; fifthly, spreading the membrane solution onto the supporting material to obtain a membrane after scraping, coating the surface with gel after a solvent is volatilized, so as to prepare the composite membrane.

Description

Technical field [0001] The invention relates to the field of materials, in particular to a composite forward osmosis membrane and a preparation method thereof. Background technique [0002] On a global scale, freshwater resources are depleted day by day, and seawater desalination technology is getting more and more attention. Therefore, membrane separation technology is receiving extensive attention from scientists. Among them, the forward osmosis technology is a membrane separation technology developed in recent years, and it is a technology that relies on solution osmotic pressure as a driving force to achieve target solution separation. Because the forward osmosis process is a spontaneous process, it has the characteristics of simple equipment and operation, low energy consumption, low pollution, high recovery, etc., and its application range is very wide, involving all aspects of industrial production and daily life. [0003] The key to forward osmosis technology lies in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/00C02F1/44
CPCB01D69/12B01D61/002B01D67/0079B01D2325/48C02F1/445
Inventor 宗同强何其伟彭力朱婷
Owner 中科检测技术服务(嘉兴)有限公司
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