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

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Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

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

[0022] 2) Dopa is dissolved in 0.1g / L Tris solution (pH 8), and a dopa solution with a concentration of 0.1g / L is prepared; soak the mesh in the dopa solution at a speed of 100r / min and a temperature of 35℃ Shake in the shaking incubator for 5 hours, then alternately shake and wash in ethanol and deionized water;

[0023] 3) Carry out interfacial polymerization on the surface of the modified polydopa screen. The interfacial polymerization conditions are as follows: the concentration of the intermediate phenylenediamine and triethylamine in the polyamine aqueous solution is 20g / L, and the concentration of the oil phase solution of trimesoyl chloride is 1g. / L, reaction for 30min; rinse with deionized water to prepare nanofiltration membrane. Measure its forward osmosis performance, the results are as follows: the water ...

Example Embodiment

[0025] Example 2

[0026] The 300 mesh polyester screen is washed with ethanol and deionized water alternately, and then fully immersed in ethanol; Dopa is dissolved in 0.1g / L Tris solution (pH 8), and the concentration is 0.1g / L Dopa solution ; Immerse the screen in the Dopa solution, shake for 5 hours in a shaking incubator at a speed of 100r / min and a temperature of 35°C, and then alternately shake and clean in ethanol and deionized water; on the surface of the modified polydopa screen Carry out interfacial polymerization. The conditions of interfacial polymerization are as follows: the concentration of phenylenediamine, triethylamine and polyethyleneimine in the aqueous phase solution of polyamine is 20g / L, 20g / L and 1g / L respectively, and the oil phase solution of trimesoyl chloride The concentration is 1g / L, the reaction is 30min; the deionized water is rinsed, and the nanofiltration membrane is prepared. The forward osmosis performance was measured, and the results are as...

Example Embodiment

[0027] Example 3

[0028] After washing the 500 mesh polyester screen with ethanol and deionized water alternately and shaking it, it is fully immersed in ethanol; Dopa is dissolved in 0.1g / L Tris solution (pH 8), and the concentration is 0.1g / L Dopa solution ; Soak the screen in the Dopa solution, shake for 12h in a shaking incubator at a speed of 100r / min and a temperature of 35°C, then alternately shake and clean in ethanol and deionized water; on the surface of the modified screen Carry out interfacial polymerization. The conditions of interfacial polymerization are as follows: the concentration of phenylenediamine, triethylamine and polyethyleneimine in the aqueous phase solution of polyamine is 20g / L, 20g / L and 1g / L respectively, and the oil phase solution of trimesoyl chloride The concentration is 1g / L, the reaction is 60min; the deionized water is rinsed, and the nanofiltration membrane is prepared. Measure its forward osmosis performance, the results are as follows: the...

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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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