Preparation method of porous plate ceramic nanofiltration body based on silicon-zirconium sol

A technology of silicon-zirconium sol and flat plate, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problem of uneven filter pore size on the filter membrane, weak combination of filter membrane and carrier, inorganic nanofiltration membrane Complicated preparation process and other issues to achieve the effect of increasing hydrothermal stability and reducing pre-loading

Active Publication Date: 2021-07-02
常州苏南水环境研究院有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the complex preparation process of the existing inorganic nanofiltration membrane, and other problems such as the weak combination of the filter membrane and the carrier, and the uneven pore size of the filter pores on the filter membrane.

Method used

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  • Preparation method of porous plate ceramic nanofiltration body based on silicon-zirconium sol
  • Preparation method of porous plate ceramic nanofiltration body based on silicon-zirconium sol
  • Preparation method of porous plate ceramic nanofiltration body based on silicon-zirconium sol

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Embodiment 1

[0028] (1) SiO 2 -ZrO 2 Sol preparation

[0029] Take ethyl orthosilicate and zirconium n-butoxide in the same molar ratio, dissolve them in absolute ethanol, add distilled water and hydrochloric acid in turn under continuous stirring, and finally form ethyl orthosilicate: zirconium n-butoxide: ethanol: The molar ratio of hydrochloric acid is 1:1:10:2. By adjusting the content of water, the mass fraction of ethyl orthosilicate + zirconium n-butoxide is maintained at 1wt%, and then the solution is heated to 100°C and boiled for 15 minutes, and then added Water cooling (approximately 50 °C) equal to boiling evaporation, repeat this step, and keep stirring for 8 hours to form stable SiO 2 -ZrO 2 Sol, the particle size is measured by dynamic light scattering technique, such as figure 2 As shown, the mixed sol particle sizes of 25nm, 300nm and 5000nm are finally formed.

[0030] (2) Pretreatment of porous flat ceramic support body

[0031] Put the porous flat ceramic support...

Embodiment 2

[0035] The difference between the sol and Example 1 is that by reducing the water content, SiO with a mass fraction of orthoethyl silicate + zirconium n-butoxide with a mass fraction of 2wt% is prepared. 2 -ZrO 2 The sol, through the particle size test, is a mixed sol particle size of 40nm, 600nm, and 5000nm, such as image 3 shown. In SiO 2 -ZrO 2 / For the preparation of porous flat ceramic membranes, the support was impregnated into 2wt% SiO 2 -ZrO 2 In the sol, the number of dipping times is 5 times, and the formed SiO 2 -ZrO 2 / The porous flat ceramic membrane has a pore size of 10nm.

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Abstract

The invention belongs to the technical field of membrane separation and water treatment filter bodies, particularly relates to a preparation method of a porous plate ceramic nanofiltration body based on silicon-zirconium sol, and solves the problems that an existing inorganic nanofiltration membrane preparation process is complicated, other filter membranes are not firmly combined with a carrier, the pore diameters of filter pores in the filter membranes are not uniform and the like. According to the scheme, the preparation method comprises the following preparation process: (1) dissolving tetraethoxysilane and zirconium n-butoxide in a solvent, then adding a catalyst and water, and stirring under a variable-temperature condition to form silicon-zirconium sol; (2) pretreating the porous plate ceramic support body, and then putting the porous plate ceramic support body into a drying oven for heating; (3) dipping the support body preheated in the step (2) into the silicon-zirconium sol obtained in the step (1), taking out and drying at room temperature; (4) carrying out heat treatment roasting, taking out and cooling to room temperature; and (5) repeating the steps (3) and (4) at least once to form the porous plate ceramic nanofiltration body with the silicon-zirconium adhesive film on the surface.

Description

technical field [0001] The invention belongs to the technical field of membrane separation and water treatment filters, and in particular relates to a method for preparing a porous flat ceramic nano-filter based on a silicon-zirconium sol. Background technique [0002] Nanofiltration is a new type of membrane separation process driven by pressure difference with a pore size between ultrafiltration and reverse osmosis. It has been widely used and researched in the field of drinking water treatment. Compared with organic nanofiltration membranes, inorganic Nanofiltration membranes have the advantages of higher chemical resistance and mechanical stability, while the current inorganic nanofiltration membranes are mostly SiO 2 、TiO 2 , ZrO 2 Equally loaded on sheet or tubular carriers, the carrier has high penetration resistance, and the preparation often requires pre-modification, which is complicated to prepare. Contents of the invention [0003] The technical problem to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/10B01D69/02B01D67/00
CPCB01D71/024B01D71/027B01D69/02B01D69/105B01D67/0039B01D61/027
Inventor 钟璟沈敏蒋建锋
Owner 常州苏南水环境研究院有限公司
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