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Preparation method for positively charged three-dimensional nanofibre membrane

A three-dimensional nanometer and nanofiber technology, applied in the field of fiber membranes, can solve the problems of complex process and high cost, and achieve the effects of high yield, light deformation and moderate elasticity

Active Publication Date: 2011-06-01
BEIJING KANGJIE ZHICHEN WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is costly and complex

Method used

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  • Preparation method for positively charged three-dimensional nanofibre membrane
  • Preparation method for positively charged three-dimensional nanofibre membrane
  • Preparation method for positively charged three-dimensional nanofibre membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take 99.9% aluminum powder and analytically pure hydrochloric acid, heat the hydrochloric acid to 90°C, slowly add aluminum powder, after a violent reaction, put it in a water bath and heat it to reflux at 90°C for 8-12 hours until all the solids are dissolved to obtain an alumina sol .

[0047] Add 20% (as Al 2 o 3 Calculate) aluminum acetate formaldehyde, disperse and dissolve at 90°C, concentrate in vacuum at 60-100°C, until the viscosity rises to the level that can be spun, then filter and spin to form a film. The obtained plain silk film is dried at 50-100° C. for 12 hours, then sintered at 1000° C., and cooled with the furnace.

[0048] Put the obtained fibrous membrane skeleton into the upper layer of the autoclave, and the lower layer is a solid obtained by precipitating 2mol / L aluminum nitrate with 10% ammonia water, and prepare it into a 10% aqueous solution, pH = 5-6, heat it at 200°C for 24 hours, take it out, Wash 3 times with pure water and 2 times with...

Embodiment 2

[0050] First, prepare acidic silica sol: dissolve sodium silicate to make a solution, filter with ammonia-type resin to obtain ammonium silicate, heat and concentrate to hydrolyze ammonium silicate, release ammonia gas, and then adjust pH=2 with hydrogen-type resin ~3, you can get acidic silica sol.

[0051] The alumina sol prepared in embodiment 1 is mixed with acidic silica sol, and the ratio is (Al 2 o 3 : SiO 2 ) 3:2, add 20% (with Al 2 o 3 Calculate) aluminum acetate formaldehyde, disperse and dissolve at 90°C, concentrate in vacuum at 60-100°C, until the viscosity rises to the level that can be spun, then filter and spin to form a film. The obtained plain silk film is dried at 50-100° C. for 12 hours, then sintered at 800° C., and cooled with the furnace.

[0052] Put the obtained fiber membrane skeleton into the upper layer of the autoclave, and the lower layer is the precipitation produced by adding 2 mol / L sodium aluminate dropwise to 5 mol / L acetic acid. Take i...

Embodiment 3

[0054] The alumina sol, acidic silica sol and boric acid prepared in embodiment 1 and 2 are mixed, and add a small amount of glucose or sucrose, the ratio is (Al 2 o 3 : SiO 2 :B 2 o 3 )61.8%: 24.2%: 14%, the ratio of sugar is 2 times or 3 times that of B, adding 20% ​​(using Al 2 o 3 Calculate) aluminum acetate formaldehyde, disperse and dissolve at 90°C, concentrate in vacuum at 60-100°C, until the viscosity rises to the level that can be spun, then filter and spin to form a film. The obtained plain silk film is dried at 50-100° C. for 12 hours, then sintered at 800° C., and cooled with the furnace.

[0055] Put the obtained fiber membrane skeleton into the upper layer of the autoclave, and the lower layer is the precipitation produced by adding 2 mol / L sodium aluminate dropwise to 5 mol / L acetic acid. Ethylene glycol, heated in water at 150°C for 48 hours, put in 0.6mol / L NaAlO 2 In the solution, add an appropriate amount of cetyl ammonium bromide, drop 10% H 2 o 2...

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Abstract

The invention relates to a preparation method for a positively charged three-dimensional nanofiber membrane. The preparation method comprises the following steps of: 1, preparing a meshed ceramic fiber framework; 2, synthesizing a rodlike or sheet-type nanoparticle on the surface of the framework obtained in the step 1 by a hydrothermal method or a steam-thermal method; and 3, obtaining a needlelike nanofiber on the nanoparticle by a soft template precipitation method. By a wet chemical method, the flexible meshed ceramic fiber framework which is capable of automatic adhesion to form a membrane and has small elastic modulus is synthesized, and a three-dimensional nano charged gamma-Al2O3 fiber is self-assembled and synthesized in situ on the surface of the framework, so a branch shaped three-dimensional structure extends from the surface of the framework, and an inorganic charged fiber membrane which can be used at high temperature and has large specific surface area and high charged electric quantity is prepared.

Description

technical field [0001] The invention relates to the technical field of fiber membranes, in particular to the preparation of positively charged three-dimensional nanofiber membranes, especially the preparation method for completing skeleton fabrication and nanofiber three-dimensional self-assembly synthesis by using wet chemical reactions. Background technique [0002] Existing applications and research involving fiber membranes are based on non-woven fiber membranes made of organic materials for water treatment or gas filtration. The retention mechanism of these membranes is mainly mechanical filtration, with almost no adsorption function. Because ceramics have stable physical and chemical properties, they are widely used in many fields. Currently, nano-Al 2 o 3 There are many studies on the preparation of ceramic powders, such as spherical α-Al 2 o 3 , fibrous or porous γ-Al 2 o 3 . Nanoscale spherical α-Al 2 o 3 and micron fibrous α-Al 2 o 3 It has been mass-prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/02
Inventor 曾惠明王世杰叶春松王子晨
Owner BEIJING KANGJIE ZHICHEN WATER TREATMENT
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