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A preparation method of double-skin forward osmosis membrane material using attapulgite as porous support material

A technology of forward osmosis membrane and porous support, which is applied in the field of preparing double-skinned forward osmosis membranes, can solve the problems of high cost of nanotubes, large concentration polarization of asymmetric forward osmosis membranes, unfavorable water permeability of forward osmosis membranes, etc., to achieve increased Large pore volume, the effect of improving water flux

Active Publication Date: 2019-09-13
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of nanotubes is high and the concentration polarization in the prepared asymmetric forward osmosis membrane is relatively large, which is not conducive to the water permeability of the forward osmosis membrane and affects the application performance of the membrane

Method used

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  • A preparation method of double-skin forward osmosis membrane material using attapulgite as porous support material
  • A preparation method of double-skin forward osmosis membrane material using attapulgite as porous support material
  • A preparation method of double-skin forward osmosis membrane material using attapulgite as porous support material

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preparation example Construction

[0027] The preparation method of the double-skinned forward osmosis membrane material using the attapulgite as the porous support material of the present invention comprises the following steps:

[0028] (1) Attapulgite pretreatment, the specific process is: take the attapulgite and grind it through a 100-300 mesh sieve, add 2-6mol / L hydrochloric acid, and the solid-liquid ratio of the attapulgite to hydrochloric acid is 1:5g / mL~1: 15g / mL, mechanically stirred at room temperature for 40-60min, filtered, washed with distilled water until neutral, then dried at 100-110°C, cooled, ground, and passed through a 100-300 mesh sieve to obtain pretreated attapulgite .

[0029] (2) Prepare the organically modified attapulgite with the pretreated attapulgite as the porous support material, and the specific steps are: (a) take the attapulgite after the pretreatment in the flask, and add distilled water, the solid-liquid of the attapulgite and distilled water The ratio is 1:50g / mL~1:150g / ...

Embodiment 1

[0032] (1) Attapulgite pretreatment, the specific process is as follows: take 2g of attapulgite and grind it through a 100-mesh sieve, add 10mL of 2mol / L hydrochloric acid, stir mechanically at room temperature for 40min, filter, wash with distilled water until neutral, and place at 100°C drying, cooling, grinding, and passing through a 100-mesh sieve to obtain a pretreated attapulgite.

[0033](2) Using attapulgite as a porous support material to prepare organically modified attapulgite, the specific steps are: (a) take 1 g of pretreated attapulgite in a flask, and add 50 mL of distilled water. (b) Stir the solution in step (a) and heat to reflux for 1 h, then cool and filter, then transfer the wet attapulgite to a dry and clean flask, and then add 50 mL of ethanol and 3 mL of mercaptopropyltrimethoxysilane. (c) Use 1mol / L HCl to adjust the pH of the solution prepared in step (b) to 5.5, heat to reflux for 4 hours, filter the solution after cooling to 20°C, and finally rinse ...

Embodiment 2

[0036] (1) Attapulgite pretreatment, the specific process is as follows: take 4g of attapulgite and grind it through a 150-mesh sieve, add 35mL of 3mol / L hydrochloric acid, stir mechanically at room temperature for 55min, filter, wash with distilled water until neutral, and place at 105°C drying, cooling, grinding, and passing through a 150-mesh sieve to obtain a pretreated attapulgite.

[0037] (2) Using attapulgite as a porous support material to prepare organically modified attapulgite, the specific steps are: (a) take 1 g of pretreated attapulgite in a flask, and add 100 mL of distilled water. (b) Stir the solution in step (a) and heat to reflux for 1.3h, then cool and filter, then transfer the wet attapulgite to a dry and clean flask, then add 80mL of ethanol and 4.5mL of mercaptopropyltrimethoxysilane . (c) Use 1mol / L HCl to adjust the pH of the solution prepared in step (b) to 6.5, then heat to reflux for 5h, cool to 22°C and filter the solution, and finally rinse the ...

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Abstract

The invention discloses a preparation method of a double-cortex positive permeable membrane material employing attapulgite as a porous support material. The method comprises the steps of (1) attapulgite pretreatment; (2) preparation of a base membrane by employing the pretreated attapulgite as the porous support material; and (3) preparation of a double-cortex positive permeable membrane. The method has the advantages that the pore volume is increased after pretreatment of the porous support material; the base membrane of the porous support material forms more reticular structures after organic modification and dehydration condensation, groups of the porous support material have hydrophobicity and the water flux is greatly improved. The retention rate of cellulose triacetate is higher than that of cellulose diacetate, inner concentration polarization is reduced by double activation layers formed at two sides of the porous support material, the retention rate is increased, and the performance of the positive permeable membrane is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polymer organic membranes, and in particular relates to a method for synthesizing an organically modified attapulgite by using an attapulgite as a porous support material through organic modification, and then compounding it with cellulose triacetate to prepare a double-skinned forward osmosis membrane. Background technique [0002] Membrane separation technology is a high-tech field that has been developing continuously in the world in recent decades. This technology can be applied to seawater desalination, seawater power generation, water treatment, food concentration, medical control of drug release, etc., especially in the direction of water treatment. The extensive attention of the academic circles and environmental protection circles can not only solve the shortage of drinking water resources, but also deal with water environmental pollution. Common membrane separation technologies include ultrafilt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/16B01D69/10B01D67/00B01D61/00
Inventor 丁辉赵丹
Owner TIANJIN UNIV
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