A composite nanofiltration boron removal membrane and preparation method thereof
A composite membrane and nanofiltration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as affecting application, poor hydrophilicity of separation membrane, and no charge.
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[0031] The present invention is also a preparation method of a composite nanofiltration boron removal membrane, specifically comprising:
[0032] Step 1: Dissolve polyethersulfone in concentrated sulfuric acid, preferably stirring and dissolving at room temperature until it becomes a homogeneous solution to obtain a mixture, and add chlorosulfonic acid dropwise under ice-bath conditions, and the dropping rate is 7~ 8 seconds, and then the mixture was stirred and reacted at a constant speed at 10°C for 4 to 10 hours to obtain a sulfonated polyethersulfone material (SPES) with sulfonic acid groups in the side chain after washing and drying; the poly The mass (g) of ether sulfone: the volume (mL) of chlorosulfonic acid is preferably 1:(1~2), more preferably 1:2; the reaction process is as follows:
[0033]
[0034] The washing and drying of the product is preferably specifically: slowly pour the viscous solution generated in the reaction vessel into ice water to obtain a flexi...
Embodiment 1
[0046] 1) In a 500mL three-necked flask equipped with mechanical stirring, nitrogen vent, condenser, and thermometer, add 10g of polyethersulfone and 100mL of concentrated sulfuric acid, stir and dissolve the above mixture at room temperature until it becomes a homogeneous solution, and keep stirring The speed is 500 revolutions per minute, and 20 mL of chlorosulfonic acid is slowly added dropwise at a constant speed under ice bath temperature control, and the dropping speed is 7 to 8 seconds per drop. The resulting viscous solution was slowly poured into an ice-water bath to obtain a thin and flexible product, which was washed 3 times with distilled water, crushed into a powder with a tissue grinder, and washed several times with distilled water until the pH The value is 6-7, then the material is soaked in deionized water for 24 hours, then put into a vacuum drying oven after suction filtration, and dried at 50°C for 24 hours to obtain a sulfonated polyethersulfone material wi...
Embodiment 2
[0059] 1) In a 500mL three-necked flask equipped with mechanical stirring, nitrogen vent, condenser, and thermometer, add 10g of polyethersulfone and 100mL of concentrated sulfuric acid, stir and dissolve the above mixture at room temperature until it becomes a homogeneous solution, and keep stirring The speed is 500 revolutions per minute, and 20 mL of chlorosulfonic acid is slowly added dropwise at a constant speed under ice bath temperature control, and the dropping speed is 7 to 8 seconds per drop. The resulting viscous solution was slowly poured into an ice-water bath to obtain a thin and flexible product, which was washed 3 times with distilled water, crushed into a powder with a tissue grinder, and washed several times with distilled water until the pH The value is 6-7, then the material is soaked in deionized water for 24 hours, then put into a vacuum drying oven after suction filtration, and dried at 50°C for 24 hours to obtain a sulfonated polyethersulfone material wi...
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