Preparation method of ceramic nanofiltration membrane

A technology of ceramic nanofiltration membrane and coating liquid, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of particle shrinkage, prevent grain growth, reduce hydrothermal temperature, and inhibit The effect of crystal aggregation

Active Publication Date: 2020-02-04
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of the sol-gel method is simple, the particle shrinkage is serious during the calcination process of the sol-gel method, and multiple coatings are required to prepare a complete nanofiltration membrane.

Method used

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  • Preparation method of ceramic nanofiltration membrane
  • Preparation method of ceramic nanofiltration membrane
  • Preparation method of ceramic nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Add an aqueous solution of nitric acid with a pH of 1.2 to 0.3mol / L n-butyl titanate solution, and stir at room temperature for 20 minutes according to the molar ratio of n-butyl titanate and water at a ratio of 1:50, then drop Add glycerin, the mass ratio of glycerin and n-butyl titanate is 1:1, continue to stir for 30 minutes, and age at 50°C for 12 hours to obtain a transparent titanium oxide sol;

[0035] (2) Add 0.1 mol of mineralizer magnesium oxide and dodecylamine to the titania sol obtained in step (1), and stir evenly, put it into a hydrothermal reaction kettle with a filling degree of 60%, and heat it at 200° C. Under heat preservation reaction for 8h, cooling to prepare a titanium oxide nano solution with uniform particles;

[0036] (3) adding PEG-400 and the hydroxymethylcellulose that molecular weight is 6000-10000 in the titanium oxide nano solution that obtains in step (2), and make the mass concentration of PEG-400 and hydroxymethylcellulose be 5 re...

Embodiment 2

[0039] (1) Add an aqueous solution of nitric acid with a pH of 1 to 0.2mol / L n-butyl titanate solution, and stir at room temperature for 20 minutes according to the molar ratio of n-butyl titanate and water at a ratio of 1:10, then drop Add glycerin, the mass ratio of glycerin and n-butyl titanate is 1:1, continue to stir for 30 minutes, and age at 50°C for 12 hours to obtain a transparent titanium oxide sol;

[0040] (2) Add 0.1mol mineralizer sodium fluoride and dodecylamine to the titania sol obtained in step (1), and stir evenly, put it into a hydrothermal reaction kettle, the filling degree is 50%, and at 120 Keeping the reaction at ℃ for 5 hours, cooling to prepare a titanium oxide nano-solution with uniform particles;

[0041] (3) adding PEG-400 and the hydroxymethylcellulose that molecular weight is 6000-10000 in the titanium oxide nanometer solution that obtains in step (2), and make the mass concentration of PEG-400 and hydroxymethylcellulose be 2 respectively %, 0....

Embodiment 3

[0044] (1) Add nitric acid aqueous solution with a pH of 1.5 to 0.5 mol / L n-butyl titanate solution, and stir at room temperature for 20 minutes according to the molar ratio of n-butyl titanate and water at a ratio of 1:100, then drop Add glycerin, the mass ratio of glycerin and n-butyl titanate is 1:2, continue to stir for 30 minutes, and age at 50°C for 12 hours to obtain a transparent titanium oxide sol;

[0045] (2) Add 0.1 mol of mineralizer ammonium nitrate and dodecylamine to the titanium oxide sol obtained in step (1), and stir evenly, put it into a hydrothermal reaction kettle with a filling degree of 80%, and heat it at 120° C. Reaction at lower temperature for 10 hours, cooling to obtain a titanium oxide nano-solution with uniform particles;

[0046] (3) adding PEG-400 and molecular weight to the hydroxypropyl cellulose of 6000-10000 in the titanium oxide nanometer solution that obtains in step (2), and make the mass concentration of PEG-400 and hydroxypropyl cellul...

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Abstract

The invention discloses a preparation method of a ceramic nanofiltration membrane. A modified sol-gel method is combined with a hydrothermal method to prepare a complete and defect-free ceramic nanofiltration membrane, glycerin is added to the modified sol to inhibit crystal transformation and prevent grain growth, a high-purity, uniform-grained nanoparticle solution is prepared through hydrothermal reaction, meanwhile, mineralizer and a surface active agent are added to the hydrothermal reaction to reduce the hydrothermal temperature and inhibit the polymerization of crystals, nano-particleswith a particle size of 3-5 nm are prepared, then a plasticizer and a binder are added, and the ceramic nanofiltration membrane is prepared.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation, and in particular relates to a preparation method of a ceramic nanofiltration membrane. Background technique [0002] Ceramic nanofiltration membranes have the characteristics of organic solvent resistance, high temperature resistance, acid and alkali resistance, high mechanical strength, large flux and long life, and are more and more widely used in chemical, energy, electronics, food and pharmaceutical industries. [0003] In the prior art, ceramic nanofiltration membranes are mainly prepared by the sol-gel method. The sol-gel method is to hydrolyze organic alkoxide or non-alkoxide precursors under certain reaction medium conditions to obtain hydrous oxides, Hydroxide or metal oxide salt sol, add an appropriate amount of additives to the sol to prepare a coating solution with a certain viscosity and concentration; then apply the coating solution to the porous support...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/02B01D65/00
CPCB01D71/024B01D71/025B01D67/0039B01D61/027B01D65/003
Inventor 陈云强洪昱斌方富林蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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