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Reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane and mesoporous technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of limited stability of inorganic nanoparticles and achieve the effect of broadening the scope of application

Inactive Publication Date: 2012-05-02
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the new reverse osmosis composite membrane of zeolite molecular sieve material still has the limitation that the pore size of the molecular sieve is too small.
And the current literature reports are to introduce inorganic nanoparticles into the organic film by physical embedding, which makes the stability of inorganic nanoparticles in the film limited.

Method used

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  • Reverse osmosis composite membrane and preparation method thereof
  • Reverse osmosis composite membrane and preparation method thereof
  • Reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Monodisperse spherical amino-functionalized mesoporous SiO 2 Preparation of nanoparticles

[0029] Amino-functionalized mesoporous SiO with 10% 3-aminopropyltriethoxysilane content in the initial reaction solution 2 Preparation of molecular sieve: Dissolve 0.2000g cetyltrimethylammonium bromide (CTAB) in 86.4ml deionized water, add 9.6ml ethanol and 0.7ml concentration of sodium hydroxide that is 2mol / L, and vigorously Stir until the solution is clear and transparent, then quickly add a mixture of 1.15ml tetraethyl orthosilicate and 0.1268g 3-aminopropyltriethoxysilane under stirring, and continue vigorously stirring for 2 hours. The reaction mixture was successively filtered, washed with ethanol three times, and dried under vacuum at 60° C. for 12 hours. The template agent was removed by solvent extraction. In a 100mL Erlenmeyer flask, add the dried material containing the template agent, 30mL absolute ethanol and 5ml concentrated hydrochloric acid (HCl36-3...

Embodiment 2

[0030] Example 2 Monodisperse spherical amino-functionalized mesoporous SiO 2 Preparation of nanoparticles

[0031] Amino-functionalized mesoporous SiO with 20% 3-aminopropyltriethoxysilane content in the initial reaction solution 2 Preparation of molecular sieves: Dissolve 0.2000g cetyltrimethylammonium bromide (CTAB) in 86.4ml deionized water, add 9.6ml ethanol and 0.7ml 2mol / L sodium hydroxide, stir vigorously at 80°C until solution Clear and transparent, the mixture of 1.02ml tetraethyl orthosilicate and 0.2536g 3-aminopropyltriethoxysilane was added rapidly under stirring, and the vigorous stirring was continued for 2 hours. The reaction mixture was successively filtered, washed with ethanol three times, and dried under vacuum at 60° C. for 12 hours. The template agent was removed by solvent extraction. In a 100mL Erlenmeyer flask, add the dried material containing the template agent, 30mL absolute ethanol and 5ml concentrated hydrochloric acid (HCl36-38%), stir at 50°C...

Embodiment 3

[0033] The preparation of embodiment 3 reverse osmosis composite membranes

[0034] Amino-functionalized mesoporous SiO with a mass fraction of 0.05% (w / v) 2 Molecular sieves were dispersed into the oil phase by ultrasound (sonication for 1h at room temperature). Immerse the wet polysulfone base membrane into the m-phenylenediamine solution (water phase) with a mass volume ratio concentration g / ml of 2%, and roll it with a rubber rod to make the water phase fully interact with the supporting membrane, and drain the water phase After (draining time is about 150s), with dispersed amino-functionalized mesoporous SiO 2 The n-hexane solution of trimesoyl chloride (TMC) of the molecular sieve is contacted for interfacial polymerization reaction, dried in the air for 2 minutes, and then heat-treated at 110-120° C. for 3 minutes to prepare a molecular sieve / polyamide reverse osmosis composite membrane. like Figure 5 As shown, the scanning electron micrographs show that the amino-f...

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Abstract

The invention relates to spherical monodisperse amino functionalized mesoporous SiO2 nano particles and a reverse osmosis composite membrane prepared from the mesoporous SiO2 nano particles. An organic group functionalized mesoporous SiO2 material contained in the reverse osmosis composite membrane breakthroughs the limitation of a zeolite molecular sieve which has under-sized aperture, and the aperture is widened to the mesoporous field from the microporous field; and organic groups in the material can react with organic monomer molecules in the process of interfacial polymerization so that a molecular sieve can be firmly introduced into the membrane in a manner of chemical bonding. The invention provides a new design scheme for the development of the high-performance reverse osmosis composite membrane. The organic group functionalized mesoporous SiO2 material can be designed individually and the organic groups in the material can be selected according to the requirement of the organic monomer molecules in the polymerization process. On one hand, the molecular sieve can be firmly introduced into the membrane; and on the other hand, the molecular sieve is endowed with different properties by different organic groups and the application scope of the reverse osmosis composite membrane can be widened.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, in particular to a reactive amino functionalized mesoporous silica / polyamide reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] my country's per capita water resources are very poor, and the high-speed economic growth makes my country's water shortage situation more severe. Therefore, how to obtain clean water and fresh water resources at low cost has become one of the research topics with important strategic significance in my country, and obtaining fresh water through reverse osmosis technology is regarded as an effective way to alleviate the pressure on water resources. [0003] The research and application of reverse osmosis composite membrane is the most important research direction in the field of reverse osmosis technology. The composite membrane overcomes the shortcomings of asymmetric membranes that are easy to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00B01D61/02
Inventor 高从堦朱桂茹包孟如王铎
Owner OCEAN UNIV OF CHINA
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