Method for preparing super-hydrophobic membrane for removing dissolved gas in water

A super-hydrophobic and water-removing technology, applied in the chemical industry, can solve problems such as flux decline, achieve the effects of reducing mass transfer resistance, good super-hydrophobicity and self-cleaning performance, and improving separation efficiency

Inactive Publication Date: 2013-09-11
SHANDONG ZHONGYU ENVIRONMENTAL PROTECTION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atchariyawut's research also found that the hydrophobic PVDF hollow fiber membrane contactor aft

Method used

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  • Method for preparing super-hydrophobic membrane for removing dissolved gas in water
  • Method for preparing super-hydrophobic membrane for removing dissolved gas in water
  • Method for preparing super-hydrophobic membrane for removing dissolved gas in water

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 7g of tetraethyl orthosilicate to 60ml of dispersant absolute ethanol, 2ml of hydrolysis catalyst ammonia and 2ml of deionized water, react at 30°C for 8h, and use the sol-gel method to prepare regular and uniform particles with a particle size of 140nm. of silica nanoparticles. Add 10 g of the alcohol solution containing silica nanoparticles dropwise to 1 g of the vinyltriethoxysilane coupling agent solution that has been catalytically hydrolyzed by ammonia water, stir for 2 hours, and carry out the reaction of the solution at a speed of 7000 r / min. After centrifugal separation, the obtained precipitate was placed in a vacuum oven at 60°C for 24 hours, then ground and sieved to obtain modified silica particles with a particle size of 10 μm. 5g of modified silicon dioxide micron particles and 10g of PVDF are added to 100ml of DMF solvent for dissolving, stirred in an oil bath at 50°C for 12h to obtain a film-making solution in which silicon dioxide particles are uni...

Embodiment 2

[0028] Add 7g of tetraethyl orthosilicate to 120ml of dispersant absolute ethanol, 5ml of hydrolysis catalyst ammonia and 5ml of deionized water, react at 30°C for 8h, and use the sol-gel method to prepare regular and uniform particles with a particle size of 50nm. of silica nanoparticles. Add 10 g of the alcohol solution containing silica nanoparticles dropwise to 2 g of the n-octylsilane coupling agent solution that has been catalytically hydrolyzed by ammonia water, stir for 2 hours, and centrifuge the reacted solution at a speed of 7000 r / min. The obtained precipitate was placed in a vacuum oven at 60° C. for 24 hours, then ground and sieved to obtain modified silica particles with a particle size of 3 μm. 10g of modified silicon dioxide micron particles and 10g of PVDF are added to 100ml of DMF solvent for dissolving, stirred in an oil bath at 50°C for 12h to obtain a film-making solution in which silicon dioxide particles are uniformly dispersed; the film-making solution...

Embodiment 3

[0030] Add 7g of tetraethyl orthosilicate to 120ml of dispersant absolute ethanol, 2ml of hydrolysis catalyst ammonia and 2ml of deionized water, react at 30°C for 8h, and use the sol-gel method to prepare regular and uniform particles with a particle size of 70nm. of silica nanoparticles. Add 10 g of the alcohol solution containing silica nanoparticles dropwise to 3 g of the n-octylsilane coupling agent solution catalyzed and hydrolyzed by ammonia water, stir for 2 hours, and centrifuge the reacted solution at a speed of 7000 r / min. After the obtained precipitate was placed in a vacuum oven at 60° C. for 24 hours, it was ground and sieved to obtain modified silica particles with a particle size of 6 μm. 10g of modified silicon dioxide micron particles and 15g of PVDF are added to 100ml of DMF solvent for dissolving, stirred in an oil bath at 50°C for 12h to obtain a film-making solution in which the silicon dioxide particles are evenly dispersed; the film-making solution is a...

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Abstract

The invention discloses a novel method for preparing a super-hydrophobic membrane for removing dissolved gas in water. Based on a self-cleaning bionic principle, coupling agent modified inorganic nanoparticles with low surface energy and hydrophobic polymer PVDF (Polyvinylidene Fluoride) are blended to obtain a super-hydrophobic flat membrane with good mechanical properties by a phase inversion method. The surface of the super-hydrophobic membrane has a water contact angle of 154+/-1 degrees and a rolling angle of 4+/-1 degrees, so that the has super-hydrophobic membrane good super-hydrophobicity and self-cleaning properties, the mass transfer resistance of the wetted membrane can be obviously reduced, and the separation efficiency of a membrane contactor is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for preparing a superhydrophobic membrane for removing soluble gases in water. The superhydrophobic membrane prepared by the invention is suitable for removing CO in water 2 or O 2 and other soluble gases, especially O in steam boiler water 2 removal. Background technique [0002] Food, biotechnology, semiconductor and boiler water all need to remove dissolved oxygen, especially in the boiler industry, the presence of dissolved oxygen can easily cause corrosion of boilers and water pipelines, and deposit on the surface of the boiler wall, causing uneven heating of the boiler According to incomplete statistics, various failures of boilers related to dissolved oxygen account for more than 40% of explosions. Therefore, the control of the oxygen content in water for thermal recovery boilers plays a key role in ensuring the safe and economical operation of thermal r...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/02B01D69/06B01D69/12B01D67/00C02F1/20
Inventor 孙海翔周滢滢韩鹏江春东李鹏孔瑛苏慧
Owner SHANDONG ZHONGYU ENVIRONMENTAL PROTECTION TECH
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