Lignin-crosslinking modified polymer separation membrane and application thereof

A cross-linking modification and lignin technology, which is applied in the field of lignin cross-linking modification polymer separation membrane, can solve the problems of difficult hydrophilicity and pollution resistance, single type of hydrophilic modifier, high synthesis cost, etc. , to achieve the effect of reducing preparation cost, low cost and simple operation

Active Publication Date: 2015-11-18
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two disadvantages in the existing polymer separation membrane blending modification method: (1) the type of hydrophilic modifier is single, or the synthesis cost is high (such as amphiphilic block polymer); (2) )Most hydrophilic polymers have go

Method used

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  • Lignin-crosslinking modified polymer separation membrane and application thereof
  • Lignin-crosslinking modified polymer separation membrane and application thereof
  • Lignin-crosslinking modified polymer separation membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Mix the polysulfone, lignosulfonate, water, and N,N-dimethylacetamide with a mass ratio of 15:0.4:1:85, stir and dissolve at 60°C for 4 hours to form a uniform solution, and then at 20 Stir at ℃ for 30 minutes and add glutaraldehyde whose mass percentage is 4 times the mass percentage of lignin in the solution. After standing for 12 hours to degas, the casting solution is obtained, which is processed by a film forming machine to form a primary film. In the next 10 minutes, it will be immersed in an aqueous solution of 15% N,N-dimethylacetamide at 50℃ by mass for 5 hours to promote crosslinking, and then transferred to a 60℃ water bath for 2 hours to stabilize crosslinking and obtain hydrophilic 性polysulfone membrane.

[0021] figure 1 with 2 These are the scanning electron micrographs of the upper surface and cross-sectional structure of Example 1.

Example Embodiment

[0022] Example 2

[0023] Mix polysulfone, alkali lignin, dioxane, and N,N-dimethylformamide with a mass ratio of 10:2:4:90, stir and dissolve at 40°C for 2 hours to form a uniform solution, and then Stir at 20°C for 10 minutes and add glutaraldehyde with a mass percentage of 6 times the mass percentage of lignin in the solution. After standing for 12 hours to degas, the casting solution is obtained, which is processed by a film forming machine to form a primary film. Within 10 minutes after molding, it is immersed in an aqueous solution of 10% by mass N,N-dimethylformamide at 60°C for 8 hours to promote crosslinking, and then transferred to a water bath at 80°C for 12 hours to stabilize crosslinking. Water-based polysulfone membrane.

Example Embodiment

[0024] Example 3

[0025] Mix polysulfone, lignosulfonate, water, and N,N-dimethylacetamide with a mass ratio of 30:0.2:1:70, stir and dissolve at 80℃ for 12 hours to form a uniform solution, and then at 40 Stir at ℃ for 1 hour, add glutaraldehyde whose mass percentage is twice the mass percentage of lignin in the solution. After standing for 12 hours, the casting solution is obtained, which is processed by a film forming machine to form a primary film. In the next 10 minutes, it will be immersed in an aqueous solution containing 60% N,N-dimethylacetamide at 15°C by mass for 10 minutes to promote cross-linking, and then transferred to a 40°C water bath to soak for 8 hours to stabilize cross-linking and obtain hydrophilic 性polysulfone membrane.

[0026] The measurement results are: the static water contact angle of the polysulfone membrane is 69°; the average pore diameter is 0.11μm; the pure water flux of the membrane at 25°C and 0.1MPa pressure is 130L·m -2 ·H -1 .

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Abstract

The invention discloses a lignin-crosslinking modified polymer separation membrane and an application thereof. Lignin is taken as a modifier and pre-dispersed in a membrane casting solution together with a crosslinking agent, lignin crosslinking is prompted through heating in a membrane forming process with a phase inversion method and an aftertreatment process, so that the crosslinked lignin exists stably in a substrate of the polymer separation membrane, and the long-acting hydrophilicity and lasting anti-fouling performance of the polymer separation membrane are realized. The lignin-crosslinking modified polymer separation membrane has low cost of raw materials, long service life and excellent anti-fouling performance; a preparation method has the advantages of simple process, easiness in operation, high universality and mild condition and is suitable for preparing a hydrophilic micro-filtration membrane, an ultrafiltration membrane, a nanofiltration membrane, a forward osmosis membrane, a reverse osmosis membrane, a pressure-retarded osmosis membrane and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a lignin cross-linked modified polymer separation membrane and its application. Background technique [0002] Membrane separation technology is widely used in pure water purification, sewage treatment, food concentration, seawater desalination, gas separation and other fields due to its simple operation, high efficiency and environmental protection. However, polymer separation membranes are easily contaminated by proteins, carbohydrates, natural organic matter, polysaccharides and other substances during the application process, resulting in clogged membrane pores, decreased flux, and shortened service life. Therefore, it is of great significance to improve the hydrophilicity and antifouling properties of polymer separation membranes. [0003] The hydrophilic modification of polymer separation membrane mainly includes adsorption method, coating method, su...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/74B01D71/06B01D71/56B01D69/12B01D69/02B01D61/18B01D61/08
Inventor 吴青芸顾林
Owner NINGBO UNIV
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