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Thin-layer composite forward osmosis membrane and preparation method thereof

A forward osmosis membrane and thin layer technology is applied in the field of preparing separation membrane composite materials to achieve the effects of increasing the quantity, improving the integrity of the skin layer, and improving the adjustment of the cross-linked structure of the skin layer

Inactive Publication Date: 2014-09-10
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is worth noting that these improvements still have not changed the status quo of "the water flux of forward osmosis is much lower than the expected value". film"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Wash the 300-mesh polyester screen with ethanol and deionized water alternately, and fully infiltrate it in ethanol;

[0022] 2) Dopa is dissolved in 0.1g / L Tris solution (pH8), and a dopa solution with a concentration of 0.1g / L is prepared; soak the screen in the dopa solution at a speed of 100r / min and a temperature of 35°C Shake in a shaking incubator for 5 hours, then alternately shake and wash in ethanol and deionized water;

[0023] 3) Interfacial polymerization is carried out on the surface of polydopa-modified screen, the interfacial polymerization conditions are: the concentration of polyamine aqueous phase solution, m-phenylenediamine and triethylamine are both 20g / L, and the concentration of trimesoyl chloride oil phase solution is 1g / L, reacted for 30 minutes; rinsed with deionized water to prepare a nanofiltration separation membrane. Measure its forward osmosis performance, the result is as follows: the water flux is 12L / m 2 h, the salt cut-off rate ...

Embodiment 2

[0026] Wash the 300-mesh polyester screen alternately with ethanol and deionized water, then fully infiltrate it in ethanol; dissolve dopa in 0.1g / L Tris solution (pH8), and prepare a dopa solution with a concentration of 0.1g / L ; Soak the screen in the dopa solution, shake it in a shaking incubator with a rotation speed of 100r / min and a temperature of 35°C for 5h, and then alternately shake and clean it in ethanol and deionized water; on the surface of the polydopa modified screen Carry out interfacial polymerization, the interfacial polymerization condition is: the concentration of phenylenediamine, triethylamine and polyethyleneimine in polyamine water phase solution is respectively 20g / L, 20g / L and 1g / L, trimesoyl chloride oil phase solution The concentration was 1g / L, reacted for 30min; rinsed with deionized water to prepare a nanofiltration separation membrane. Measure its forward osmosis performance, the result is as follows: the water flux is 17L / m 2 h, the salt cut-...

Embodiment 3

[0028] Wash the 500-mesh polyester screen with ethanol and deionized water alternately, then fully infiltrate it in ethanol; dissolve dopa in 0.1g / L Tris solution (pH8), and prepare a dopa solution with a concentration of 0.1g / L ; Soak the screen in the dopa solution, shake it in a shaking incubator with a rotation speed of 100r / min and a temperature of 35°C for 12h, and then alternately shake and clean it in ethanol and deionized water; on the surface of the polydopa modified screen Carry out interfacial polymerization, the interfacial polymerization condition is: the concentration of phenylenediamine, triethylamine and polyethyleneimine in polyamine water phase solution is respectively 20g / L, 20g / L and 1g / L, trimesoyl chloride oil phase solution The concentration was 1g / L, reacted for 60min, and rinsed with deionized water to prepare a nanofiltration separation membrane. Determination of its forward osmosis performance, the results are as follows: the water flux is 20L / m 2 ...

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Abstract

The invention provides a preparation method of a thin-layer composite forward osmosis membrane. On the basis of maintaining the original advantages, the prepared forward osmosis membrane can effectively reduce the polarization of internal concentration difference so as to greatly improve the water flux, can greatly improve the compounding strength of a screen supporting layer and an interface polymerized cortex, can improve the durability of the forward osmosis membrane, prolong the service life and can solve the bottleneck problem of the forward osmosis application. Dopa and / or dopamine is adopted for chemically modifying and decorating a screen, so that not only can the original excellent supporting layer structure of the screen be maintained, but also the hydrophilia and reaction property of the screen can be improved, and the compatibility between the screen and the cortex can be improved. In addition, long chain / hyperbranched macromolecules and surface active agent are added to polyamine aqueous solution, so that not only can the quantity of active groups be increased, but also the space structure of the macromolecule can be enlarged, the complete pavement of the aqueous solution on the surface of the screen can be facilitated, the cortex completeness can be improved, and a purpose of adjusting the cross-linking structure of the cortex can be realized.

Description

technical field [0001] The invention belongs to the field of preparing separation membrane composite materials, and in particular relates to a thin-layer composite forward osmosis membrane and a preparation method thereof, that is, a thin-layer composite forward osmosis membrane obtained by directly interfacial polymerization on the surface of a chemically modified screen mesh and a preparation method thereof . Background technique [0002] The scarcity of water resources and the deterioration of water quality have seriously affected human life and health. Future peace and sustainable development will also be closely related to the acquisition of clean water and fresh water. How to achieve water purification and desalination at low cost has become an important scientific and technological issue of concern to countries all over the world. It is against this background that forward osmosis technology emerged. This technology is a low-pressure membrane separation process that...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D69/12B01D67/00C02F1/44
Inventor 徐佳李明明张丽丽唐媛媛单宝田高从堦
Owner OCEAN UNIV OF CHINA
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