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Preparation method of composite forward osmosis membrane with Turing structure

A forward osmosis membrane, Turing's technology, applied in the field of membrane technology and water treatment, can solve the problems that cannot be widely used, and achieve the effect of low price and stable performance

Inactive Publication Date: 2018-12-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only recover pure water from raw liquid wastewater, and cannot be widely used in other wastewater treatment.

Method used

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  • Preparation method of composite forward osmosis membrane with Turing structure

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preparation example Construction

[0030] Such as figure 1 A kind of preparation method of the composite forward osmosis membrane with Turing structure that the shown invention proposes, comprises the following steps:

[0031] (1) Preparation of sulfonated polysulfone, the specific process is: (1a) polysulfone is added in 1,2-dichloroethane, and stirred in a round-bottomed flask until polysulfone and 1,2-dichloroethane are completely Dissolving to form a uniform and stable solution, the solid-to-liquid ratio of polysulfone to 1,2-dichloroethane is 0.1g:1mL~0.5g:1mL;

[0032] (1b) Slowly drop concentrated sulfuric acid with a mass percentage concentration of 70-80% into a uniform stable solution to form a mixed solution, the volume ratio of the concentrated sulfuric acid to the uniform stable solution is 0.25:1-0.75:1;

[0033] (1c) After stirring the mixed solution at 23-25°C for 5-8 hours, pour out 1,2-dichloroethane and excess concentrated sulfuric acid, and then deionize the solid matter attached to the bot...

Embodiment 1

[0044] To prepare a composite forward osmosis membrane with a Turing structure, the specific process is as follows:

[0045] (1) The preparation of sulfonated polysulfone, the specific process is: (a) take 0.2 g of polysulfone, add polysulfone into 1,2-dichloroethane, stir in a round bottom flask until polysulfone and 1,2 -Dichloroethane is completely dissolved to form a uniform and stable solution, the solid-to-liquid ratio of the polysulfone to 1,2-dichloroethane is 0.1g:1mL; (b) Slowly drop concentrated sulfuric acid into the uniform and stable solution to form For the mixed solution, the volume ratio of the concentrated sulfuric acid to the uniform stable solution is 0.25:1, and the concentrated sulfuric acid mass percentage concentration used is 70%; (c) after stirring the mixed solution at 23° C. for 5 h, pour out 1 , 2-dichloroethane and excess concentrated sulfuric acid, and then wash the solid matter adhering to the bottom of the round-bottomed flask with deionized wa...

Embodiment 2

[0051] To prepare a composite forward osmosis membrane with a Turing structure, the specific process is as follows:

[0052] (1) The preparation of sulfonated polysulfone, the specific process is: (a) take polysulfone 0.4g, add polysulfone in 1,2-dichloroethane, stir in the round bottom flask until polysulfone and 1,2 -Dichloroethane is completely dissolved to form a uniform and stable solution, the solid-to-liquid ratio of the polysulfone to 1,2-dichloroethane is 0.3g:1mL; (b) Slowly drop concentrated sulfuric acid into the uniform and stable solution to form For the mixed solution, the volume ratio of the concentrated sulfuric acid to the homogeneous stable solution is 0.5:1, and the mass percent concentration of the concentrated sulfuric acid used is 75%; (c) after stirring the mixed solution at 24°C for 6.5h, pour it out 1,2-Dichloroethane and excess concentrated sulfuric acid, and then wash the solid matter attached to the bottom of the round-bottomed flask with deionized...

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Abstract

The invention discloses a preparation method of a composite forward osmosis membrane with a Turing structure. The method includes the steps of: (1) preparation of sulfonated polysulfone: fully mixingsulfonated polysulfone, 1, 2-dichloroethane and concentrated sulfuric acid to obtain a solid substance, washing the solid substance with deionized water and performing drying; (2) preparation of a sulfonated polysulfone support layer: mixing sulfonated polysulfone with N, N-dimethylformamide, then performing degassing, performing coating into a film and conducting cooling; and (3) preparation of asulfonated polysulfone-polyamide composite layer forward osmosis membrane: soaking a sulfonated polysulfone support layer in a mixed solution of m-phenylenediamine and polyvinyl alcohol, and conducting N2 purging; then placing the support layer in a mixed solution of trimesoyl chloride and n-hexane, and conducting drying and cooling. The existence of the Turing structure provides a lot of high water permeability sites to the forward osmosis membrane prepared according to the method, and the water permeability and salt retention rate of the membrane are greatly improved compared with the traditional forward osmosis membranes.

Description

technical field [0001] The invention belongs to the technical fields of membrane technology and water treatment, and in particular relates to a preparation method of a composite forward osmosis membrane with a Turing structure and its application in treating heavy metal ions in sewage. Background technique [0002] Water is an indispensable natural resource in human life, which promotes the development of society and the progress of human civilization. However, the problem of scarcity of fresh water resources in the world is becoming more and more serious, which threatens the survival and development of human beings to a certain extent. Cities across the country are short of 6 billion cubic meters of water every year, and the annual economic loss caused by water shortage is about 200 billion yuan. With the continuous expansion of the city scale, the amount of discharged sewage is also increasing, the water quality is deteriorating, and the water body is polluted, which affe...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D69/02B01D69/12B01D71/56B01D71/68C02F1/44
CPCB01D61/002B01D67/0006B01D69/02B01D69/125B01D71/56B01D71/68B01D2325/36C02F1/445
Inventor 丁辉张思琦朱慧真
Owner TIANJIN UNIV
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