Surface adsorption modified anti-pollution forward osmosis film based on aminoaluminosilicate nano-tubes

A forward osmosis membrane and aluminum amide technology, which is applied in the field of membrane separation, can solve the problems of difficult removal of membrane surface pollution, clogging of membrane pores, decrease in membrane flux, etc., so as to improve the anti-pollution ability and prolong the service life.

Inactive Publication Date: 2019-10-08
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Colloidal particles tend to accumulate on the surface of the forward osmosis membrane to form a filter cake layer during the forward osmosis process, which will not only lead to a decrease in membrane flux and clogging of membrane pores, but will also make it more difficult to remove contamination on the membrane surface by physical means

Method used

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  • Surface adsorption modified anti-pollution forward osmosis film based on aminoaluminosilicate nano-tubes
  • Surface adsorption modified anti-pollution forward osmosis film based on aminoaluminosilicate nano-tubes

Examples

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Effect test

Embodiment 1

[0022] Surface modification of aluminosilicate nanotubes to obtain aluminosilicate nanotubes rich in amino groups on the surface, first add 30mL deionized water to 30.75 grams of nanotube gel, place in a beaker for 30min magnetic stirring, and then ultrasonically disperse After 30 min, the nanotube solution was heated and stirred at 60° C. for 30 min. Calculate the number of hydroxyl moles in the added nanotubes to be 0.003 moles, then add 0.29 grams of sodium hydroxide and magnetically stir in the nanotube solution for 30 minutes, then add 1.30 grams of (3-chlorodihydroxypropyl) trimethyl chloride in batches. ammonium aqueous solution, and adjust the pH to 12.5, heated and stirred at 60° C. for 10 h, and dialyzed with a dialysis bag for 48 h to obtain amidated aluminosilicate nanotubes. Next, mix the film-forming polysulfone particles with N,N-dimethylformamide and N-methylpyrrolidone (mass ratio: 1:3), heat to 60°C, and stir for 8 hours to form a polymer with a mass percent ...

Embodiment 2

[0030] Surface modification of aluminosilicate nanotubes was performed to obtain aluminosilicate nanotubes with rich amino groups on the surface. First, 40.75 g of nanotube gel was added with 30 mL of deionized water, placed in a beaker with magnetic stirring for 30 min, and then ultrasonically dispersed. After 30 minutes, the nanotube solution was heated and stirred at 60°C for 30 minutes. Calculate the number of moles of hydroxyl groups in the added nanotubes to be 0.0043 moles, then add 0.41 g of sodium hydroxide, stir magnetically for 30 min in the nanotube solution, and then add 1.87 g of (3-chlorodihydroxypropyl) trimethyl chloride in batches. Aqueous ammonium solution, adjusted to pH 12.5, heated and stirred at 60°C for 10 hours, and dialyzed with a dialysis bag for 48 hours to obtain aluminized aluminosilicate nanotubes. Next, the polysulfone particles were mixed with N,N-dimethylformamide and N-methylpyrrolidone (mass ratio of 1:3), heated to 60°C, and stirred for 8 h...

Embodiment 3

[0033] Surface modification of aluminosilicate nanotubes was carried out to obtain aluminosilicate nanotubes rich in amino groups on the surface. First, 50.75 g of nanotube gel was added with 30 mL of deionized water, placed in a beaker with magnetic stirring for 30 min, and then ultrasonically dispersed. After 30 min, the nanotube solution was heated and stirred at 60°C for 30 min. Calculate the number of moles of hydroxyl groups in the added nanotubes to be 0.0054 moles, then add 0.52 g of sodium hydroxide, stir magnetically for 30 min in the nanotube solution, and then add 2.34 g of (3-chlorodihydroxypropyl) trimethyl chloride in batches. Aqueous ammonium solution, adjusted to pH 12.5, heated and stirred at 60°C for 10 hours, and dialyzed with a dialysis bag for 48 hours to obtain aluminized aluminosilicate nanotubes. Next, the film-forming polysulfone particles were mixed with N,N-dimethylformamide and N-methylpyrrolidone (mass ratio of 1:3), heated to 60°C, and stirred fo...

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Abstract

The invention discloses a surface adsorption modified anti-pollution forward osmosis film based on aminoaluminosilicate nano-tubes. The aminoaluminosilicate nano-tubes are adhered on the surface of apolyamide film compounded forward osmosis film under the action of electrostatic adsorption to prepare the compound film, and intrinsic hydrophilic characteristics of the aminoaluminosilicate nano-tubes are organically combined, so that the film has excellent anti-pollution performance. The surface adsorption modified anti-pollution forward osmosis film based on the aminoaluminosilicate nano-tubeshas the advantages of low raw material cost, long service life, excellent anti-pollution performance and the like, and a preparation method has the advantages of simple process, easiness in operation, high universality, mild conditions and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an anti-pollution forward osmosis membrane based on surface adsorption modification of amidated aluminosilicate nanotubes. Background technique [0002] In recent years, forward osmosis (FO) membrane technology has developed rapidly. It is not only used for seawater desalination and sewage purification to obtain fresh water resources, but also used for salinity difference power generation to obtain clean new energy, which has attracted in-depth research by scientists around the world. Different from traditional membrane processes such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, and electrodialysis, the forward osmosis separation process refers to the spontaneous separation of water molecules from higher chemical potentials driven by the osmotic pressure difference of the solution on both sides of the membrane. One side (draw liqui...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/02B01D69/12B01D67/00B01D61/00
CPCB01D61/002B01D67/0079B01D69/02B01D69/12B01D71/56
Inventor 吴青芸王少飞顾林
Owner NINGBO UNIV
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