A kind of anti-biological pollution loose nanofiltration composite membrane and preparation method
An anti-biological fouling, composite membrane technology, applied in the field of membrane separation, can solve the problems of pollution and salt ion retention, and achieve the effects of excellent separation performance, improved retention rate, and improved hydrophilicity
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Embodiment 1
[0018] Chitosan graft copolymer Chitin-g-P DMAPS Preparation of:
[0019] 1) dissolving 0.5 g of chitosan with a weight-average molecular weight of 60,000 Da in 50 ml of aqueous acetic acid solution with a concentration of 2.0 wt%, stirring at 60° C. for 30 min, to obtain a chitosan solution;
[0020] 2) Nitrogen gas is introduced, and the final concentration of 0.0182mol / L cerium ammonium nitrate and the final concentration of 0.1792mol / LDMAPS (2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl) Ammonium hydroxide) was added to the chitosan solution obtained in step 1), sealed, heated to 50°C, reacted for 2h, the suspension was taken out, suction filtered, rinsed with distilled water, stirred and then suction filtered, so repeated several times, finally The precipitate was dried in a vacuum oven at 60°C to obtain the chitosan graft copolymer Chitin-g-P DMAPS .
[0021] Experiments have proved that the main chain prepared by other methods is chitosan, and the side ch...
Embodiment 2
[0023] A preparation method of a loose nanofiltration composite membrane for anti-biological fouling, comprising the steps of:
[0024] Soak a polysulfone membrane with a molecular weight cut-off of 30000Da in 2wt% aqueous solution of hyperbranched polyethyleneimine with a number average molecular weight of 600Da for 20min. Sugar graft copolymer (prepared in Example 1) solution for 1h, the solvent of the chitosan graft copolymer solution is 1wt% acetic acid aqueous solution; take it out, put it in an oven at 59°C to dry, and then use 1mol / L The NaOH aqueous solution soaks 2h, takes out, rinses with pure water; Immerses in the water containing cross-linking agent and sulfuric acid, the concentration of described cross-linking agent (adipaldehyde) is 1wt%, and the concentration of described sulfuric acid is 1wt%, at 50 °C for 2 h to obtain a loose nanofiltration composite membrane that resists biofouling.
[0025] The measured flux of the above-mentioned loose nanofiltration co...
Embodiment 3
[0027] A preparation method of a loose nanofiltration composite membrane for anti-biological fouling, comprising the steps of:
[0028] Soak a polyethersulfone membrane with a molecular weight cut-off of 1000Da in 2wt% hyperbranched polyethyleneimine aqueous solution with a number average molecular weight of 300Da for 60min. Chitosan graft copolymer (prepared in Example 1) solution for 2h, the solvent of the chitosan graft copolymer solution is 5wt% acetic acid aqueous solution; take out, be placed in 30 ℃ of baking oven and dry, and use The NaOH aqueous solution of 0.1mol / L soaks 2h, takes out, rinses with pure water; Immerses in the water that contains crosslinking agent (glyoxal) and sulfuric acid, and the concentration of described glyoxal is 0.5wt%, and the concentration of described sulfuric acid is Sulfuric acid 0.5wt%, cross-linked at 90°C for 2 hours, to obtain a loose nanofiltration composite membrane that resists biofouling.
[0029] The measured flux of the loose ...
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