Protein-fouling-resistant zwitter-ion ultrafiltration membrane and preparation method thereof
A zwitterion, ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of inability to meet ultrafiltration requirements, decrease in membrane hydrophilicity, poor antifouling selectivity, etc., and achieve easy scale, good thermal stability, and use long life effect
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Embodiment 1
[0038]1. Preparation of imidized chitosan: prepare a 2% chitosan solution with a mass concentration of 2% acetic acid solution, and stir at 60°C for 60 minutes. The prepared solution contains 2g chitosan Take by weighing 4g p-dimethylaminobenzaldehyde and be dissolved in the dehydrated alcohol of 70mL and be configured into the ethanol solution of p-dimethylaminobenzaldehyde; After the two kinds of solutions that are configured are mixed, adjust the pH value with the hydrochloric acid solution of 1mol / L about 3, stirred and reacted at room temperature for 6 hours, then added 3mL, 2mol / L sodium hydroxide solution to the reaction solution to adjust the pH value of the reaction solution to about 5, then added 80μL, 0.63mol / L hydroboration solution to the reaction solution Sodium solution for reduction reaction, after the reaction is complete, quickly add 15mL, 3mol / L sodium hydroxide solution to precipitate a precipitate, collect the precipitate, wash with acetone and ethanol thre...
Embodiment 2-5
[0047] By the same steps of Example 1, change the proportion of the amphoteric ionization chitosan component in the solution, other steps are the same as in Example 1, prepare ultrafiltration membrane and its water absorption, porosity, exchange capacity Carried out the test, and the test results are shown in Table 1:
[0048] Table 1: Performance test data of ultrafiltration membranes prepared in Examples 2 to 5
[0049]
[0050] Table 1 is the corresponding data of the amphoteric ion chitosan ultrafiltration membrane of the different content that makes in the present embodiment 2~5, can find out, along with the increase of amphoteric ion chitosan content, its porosity, water absorption The volume and exchange capacity increase accordingly.
[0051] Figure 5 For the different content zwitterionic chitosan ultrafiltration membranes prepared in Examples 2~5 (Z-0, Z-1, Z-2, Z-4 represent that the consumption ratio of zwitterionic polysaccharide is respectively 0%, 10%, 20...
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