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Method for improving desalination stability of porous ceramic membrane by constructing hydrophobic protective layer

A technology of porous ceramic membrane and hydrophobic protective layer, which is applied in the field of membrane distillation desalination, can solve the problems that steam cannot pass through the membrane material and cannot be desalted by membrane distillation, and achieves strong operability, obvious hydrophobic protection effect, and simple manufacturing process Effect

Active Publication Date: 2021-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after curing, PDMS forms a dense polymer. If it is directly coated on the surface of porous ceramics as a hydrophobic layer, it will block the pore structure of the ceramics, resulting in the inability of steam to pass through the membrane material, so that it cannot be used for membrane distillation desalination.

Method used

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  • Method for improving desalination stability of porous ceramic membrane by constructing hydrophobic protective layer
  • Method for improving desalination stability of porous ceramic membrane by constructing hydrophobic protective layer
  • Method for improving desalination stability of porous ceramic membrane by constructing hydrophobic protective layer

Examples

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Effect test

Embodiment 1

[0033] Cordierite porous ceramic membrane with a pore size of 0.1-0.5 μm was post-grafted in 15% tridecafluorooctyltriethoxysilane-ethanol solution for 24 hours, and then placed in an oven at 100°C for condensation reaction , Take it out after 24 hours. Prepare a NaCl solution with a mass fraction of 20%, put it into an air pressure spray gun with a nozzle diameter of 0.3mm, and spray it at a distance of 20cm from the ceramic membrane substrate for 15s, and then place it in an oven at 50°C to crystallize NaCl. Weigh Sylgard184-PDMS in proportion, add n-hexane to dilute to a diluent with a mass fraction of 10%; add SiO with a mass ratio of 0.30 to PDMS 2 , and mix evenly; put the mixed solution into an air pressure spray gun with a nozzle diameter of 0.3mm, and spray it 10cm away from the ceramic membrane substrate for 15s. Then put the ceramic membrane in an oven at 80°C to cure for 2 hours, and then soak it in deionized water, changing the water three times during this perio...

Embodiment 2

[0035] Cordierite porous ceramic membrane with a pore size of 0.1-0.5 μm was post-grafted in 15% tridecafluorooctyltriethoxysilane-ethanol solution for 24 hours, and then placed in an oven at 100°C for condensation reaction , Take it out after 24 hours. Prepare a NaCl solution with a mass fraction of 20%, put it into an air pressure spray gun with a nozzle diameter of 0.3mm, and spray it at a distance of 20cm from the ceramic membrane substrate for 15s, and then place it in an oven at 50°C to crystallize NaCl. Weigh Sylgard184-PDMS in proportion, add n-hexane to dilute into a diluent with a mass fraction of 10%; add SiO2 with a mass ratio of 0.30 to PDMS, and mix evenly; put the mixed solution into an air pressure spray gun with a nozzle diameter of 0.3mm, Spray at a distance of 10cm from the base of the ceramic membrane for 15s. Then put the ceramic membrane in an oven at 80°C to cure for 2 hours, and then soak it in deionized water, changing the water three times during thi...

Embodiment 3

[0037]Cordierite porous ceramic membrane with a pore size of 0.1-0.5 μm was post-grafted in 15% tridecafluorooctyltriethoxysilane-ethanol solution for 24 hours, and then placed in an oven at 100°C for condensation reaction , Take it out after 24 hours. Prepare a NaCl solution with a mass fraction of 20%, put it into an air pressure spray gun with a nozzle diameter of 0.3mm, and spray it at a distance of 20cm from the ceramic membrane substrate for 15s, and then place it in an oven at 50°C to crystallize NaCl. Weigh Sylgard184-PDMS in proportion, add n-hexane to dilute into a diluent with a mass fraction of 10%; add SiO2 with a mass ratio of 0.30 to PDMS, and mix evenly; put the mixed solution into an air pressure spray gun with a nozzle diameter of 0.3mm, Spray at a distance of 10cm from the base of the ceramic membrane for 15s. Then put the ceramic membrane in an oven at 80°C to cure for 2 hours, and then soak it in deionized water, changing the water three times during this...

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Abstract

The invention provides a method for improving the desalination stability of a porous ceramic membrane by constructing a hydrophobic protective layer. The method comprises the following steps: firstly, carrying out hydrophobic modification on the surface of a porous ceramic membrane by using a hydrophobic modifier, then spraying a pore-forming agent solution on the surface of the porous ceramic membrane, and drying to crystallize the porous ceramic membrane into pore-forming agent particles; then, diluting PDMS with an organic matter, and adding a certain proportion of hydrophobic nano silicon dioxide particles; uniformly spraying a PDMS solution containing SiO2 onto the surface of the ceramic membrane on which the pore-forming agent particles are fully distributed, and curing; and soaking the cured ceramic membrane in water to dissolve the pore-forming agent particles, and drying to obtain the porous ceramic membrane with a porous PDMS protective layer constructed on the surface. The obtained ceramic membrane has the advantages of being good in air permeability, high in hydrophobic stability, stable in chemical property, low in cost, simple in method and the like, when the ceramic membrane is applied to membrane distillation desalination, the desalination rate is kept 100%, and continuous experimental operation can be conducted for 300 h or above.

Description

technical field [0001] The invention relates to the technical field of membrane distillation desalination, and relates to a method for improving desalination stability by constructing a porous PDMS hydrophobic protective layer on the surface of a ceramic membrane. Background technique [0002] Fresh water resources are scarce on the earth, and the water resources that can be directly used by humans only account for 0.3% of the total fresh water. Humans have a huge demand for fresh water resources. Uneven distribution of water resources, irrational exploitation and waste of pollution have caused a large shortage of fresh water resources. Desalination of seawater can improve the shortage of fresh water to a certain extent, and plays an important role in alleviating the crisis of global fresh water resources. [0003] Membrane distillation is a technology with low transmembrane pressure, low energy consumption, simple operation, stable operation and theoretically 100% desalina...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D61/36
CPCB01D67/0093B01D67/0088B01D69/02B01D61/364B01D2323/18B01D2323/26B01D2325/30B01D2325/38
Inventor 韦奇代雪王亚丽李群艳
Owner BEIJING UNIV OF TECH
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