A kind of allophane silicon nanotube hybrid forward osmosis membrane

A technology of silicon nanotubes and allophane, applied in the field of membrane separation, can solve problems such as cumbersome operation steps, achieve the effects of reducing internal concentration polarization and prolonging service life

Active Publication Date: 2018-12-28
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can effectively improve the selectivity of the forward osmosis membrane, the operation steps of this method are cumbersome and often at the expense of the water flux of the membrane

Method used

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  • A kind of allophane silicon nanotube hybrid forward osmosis membrane

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Experimental program
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Effect test

Embodiment 1

[0022] Polysulfone and allophane silicon nanotubes with a mass ratio of 4.5:0.1:25 (such as figure 1 Shown), N,N-dimethylacetamide mixed, first under the ultrasonic frequency of 80KHz for 30min, then stirred and dissolved at 80°C for 6h to form a uniform solution, after standing for 12h to obtain the casting solution, through the film forming Machining and molding to form a primary film, within 10 minutes after forming, immerse in an aqueous solution with a mass percentage of 0.2% N,N-dimethylacetamide at 20°C for 24 hours; immerse the obtained basement film in a mass percentage of 2% m-phenylenediamine aqueous solution for 1 min, drain the aqueous solution, and then transfer to a hexane solution of 1% trimesoyl chloride for 1 min, remove the excess solution on the membrane surface, and place the membrane in a 60°C oven Heating in medium temperature for 40min to obtain allophane-silicon nanotube hybrid polysulfone forward osmosis membrane.

[0023] The pure water flux of the ...

Embodiment 2

[0026] Mix polysulfone, allophane silicon nanotubes, and N,N-dimethylacetamide with a mass ratio of 4.5:0.2:25, first place it under ultrasonic waves at a frequency of 80KHz for 30min, then stir and dissolve at 80°C for 6h to form a uniform The solution was left to defoam for 12 hours to obtain the casting solution, which was processed by a film forming machine to form a nascent film, and entered into an aqueous solution with a mass percentage of 0.2% N,N-dimethylacetamide within 10 minutes after forming Immerse for 24 hours; immerse the obtained basement film in an aqueous solution of 2% m-phenylenediamine by mass for 1 min, drain the aqueous solution, and then transfer it to a hexane solution of trimesoyl chloride with a mass percentage of 1% After removing excess solution on the surface of the membrane for 1 min, the membrane was heated in an oven at 60° C. for 40 min to obtain an allophane silicon nanotube hybrid polysulfone forward osmosis membrane.

[0027] The measureme...

Embodiment 3

[0029] Mix polysulfone, allophane silicon nanotubes, and N,N-dimethylacetamide with a mass ratio of 4.5:0.3:25, first place it under ultrasonic waves at a frequency of 80KHz for 30min, then stir and dissolve at 80°C for 6h to form a uniform After standing for degassing for 12 hours, the casting solution was obtained, and processed by a film forming machine to form a nascent film, and immersed in an aqueous solution with a mass percentage of 0.2% N,N-dimethylacetamide within 10 minutes after forming 24h; Immerse the obtained basement film in an aqueous solution of 2% m-phenylenediamine by mass for 1 min, drain the aqueous solution, and then transfer it to a hexane solution of 1% by mass of trimesoyl chloride for 1 min , after removing excess solution on the membrane surface, the membrane was heated in an oven at 60° C. for 40 minutes to obtain an allophane silicon nanotube hybrid polysulfone forward osmosis membrane.

[0030] The measurement results are: the pure water flux of ...

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Abstract

The invention discloses an allophane silicon nanotube hybridized forward osmosis membrane. An allophane silicon nanotube serves as a modifying agent, is pre-dispersed in membrane casting liquid and is converted into a membrane through a phase, and then allophane silicon nanotube hybridized forward osmosis membrane is obtained through interfacial polymerization. The inner concentration polarization of the forward osmosis membrane is effectively reduced, and water flux of the forward osmosis membrane is improved. The forward osmosis membrane has high permeation flux and efficient selectivity.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to an allophane-silicon nanotube hybrid forward osmosis membrane. Background technique [0002] Forward osmosis membrane technology is one of the most promising separation membrane technologies in the new century. Taking salt water as an example, the solution on both sides of the forward osmosis membrane has an osmotic pressure difference due to different concentrations. The osmotic pressure difference allows water to spontaneously diffuse from the side with a higher concentration to the side with a lower concentration, while the forward osmosis membrane It plays the role of intercepting salt ions. Compared with reverse osmosis membranes, nanofiltration membranes and microfiltration membranes, forward osmosis membranes use osmotic pressure as the driving force in the application process, without external pressure, and have obvious advantages in energy saving and environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D67/00B01D61/00
CPCB01D61/002B01D67/0002B01D71/027B01D71/68
Inventor 吴青芸潘叶寒顾林
Owner NINGBO UNIV
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