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Method for modifying hydrophobicity of ceramic membrane, its application and its apparatus

A hydrophobic modification and ceramic membrane technology, which is applied in the field of ceramic membranes, can solve the problems of new membrane materials limiting the industrial application of membrane distillation, and achieve the effects of good modification effect, expanded source, and high mechanical strength

Inactive Publication Date: 2012-04-25
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In summary, although the previous membrane distillation method is theoretically feasible, the lack of development of new membrane materials limits the industrial application of membrane distillation.

Method used

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  • Method for modifying hydrophobicity of ceramic membrane, its application and its apparatus
  • Method for modifying hydrophobicity of ceramic membrane, its application and its apparatus
  • Method for modifying hydrophobicity of ceramic membrane, its application and its apparatus

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Embodiment 1

[0025] A method for hydrophobic modification of a ceramic membrane, the specific steps of which are:

[0026] (1) The selection of organic precursors, choose dimethyl dichlorosilane ((CH 3 ) 2 SiCl 2 ) as an organic precursor, because chlorine has low surface activation energy, high hydrophobicity and oxidation resistance;

[0027] (2) Preparation of modified solution, the selected organic precursor 2mol / L was dissolved in cyclohexane, and vigorously stirred for 12 hours at room temperature to obtain modified solution;

[0028] (2)Al 2 o 3 The ceramic membrane was pre-treated, soaked in NaOH solution (3mol / L) for 10 minutes, washed with chloroform and deionized water, placed in an oven at 150°C for 1 hour, and then cooled to room temperature;

[0029] (3)Al 2 o 3 The surface grafting reaction of the ceramic membrane; the pre-treated Al 2 o 3 Soak the ceramic membrane in the organic modification solution for 24 hours; the chemical modification reaction generally occurs...

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Abstract

The invention relates to a method for modifying hydrophobicity of a ceramic membrane, its application and its apparatus. The method comprises the following steps: 1) selecting an organic precursor; 2) preparing a modification solution; 3) pretreating the Al2O3 ceramic membrane, immersing for 8-12 minutes in a NaOH solution (3mol / L), washing by chloroform and deionized water, placing in a baking oven at the temperature of 140-160 DEG C for 0.75-1.25 hours, and cooling to the room temperature; 4) carrying out grafting reaction on the surface of the Al2O3 ceramic membrane; 5) performing heat treatment on the modified Al2O3 ceramic membrane, washing the modification solution on the surface of the modified Al2O3 ceramic membrane by deionized water, and placing in the baking oven of 95-105 DEG C for 11-13 hours to obtain the hydrophobic modified ceramic membrane. One of the greatest use of the membrane is an application in membrane distillation. The invention has the advantages of simple technology, good chemical stability, acid resistance, alkali resistance, organic solvent resistance, large mechanical strength, easy flushing, strong antimicrobial capability, high temperature resistance, narrow aperture distribution, high separation efficiency and the like.

Description

【Technical field】 [0001] The invention relates to the technical field of ceramic membranes, in particular to a method for hydrophobic modification of ceramic membranes and its application and device. 【Background technique】 [0002] Ceramic membrane is the most important kind of inorganic membrane. It has good chemical stability, acid resistance, alkali resistance, organic solvent resistance, high mechanical strength, easy washing, strong anti-microbial ability, high temperature resistance, narrow pore size distribution and high separation efficiency. . However, due to the existence of hydroxyl groups on the surface of the ceramic membrane itself, the surface tension is relatively high, the affinity for water is strong, and it does not have hydrophobicity. For some special purposes such as membrane distillation process, it cannot meet the requirements of hydrophobic membranes. The hydrophobic modification of the hydrophilic ceramic membrane must be achieved through certain s...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/02B01D61/36
Inventor 杨座国刘典
Owner EAST CHINA UNIV OF SCI & TECH
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