A kind of large flux carboxyl polyethersulfone loose nanofiltration membrane and preparation method thereof
A carboxyl polyether sulfone and high-throughput technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problem of high throughput of dye molecules, high retention of dye molecules, large pore size of hollow fiber nanofiltration membrane, and low retention of dye molecules and other problems, to achieve the effect of improving the negative charge, high retention rate, and short time consumption
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Embodiment 1
[0034] A method for preparing a large-flux carboxyl polyethersulfone loose nanofiltration membrane, comprising the steps of:
[0035] (1) Synthesis of double bond polyethersulfone:
[0036] Add 1 mmol 3,3'-diallyl-4,4'-dihydroxydiphenylsulfone, 3 mmol 4,4'-dihydroxydiphenylsulfone, 10 mmol 4,4'-difluorodiphenylsulfone, 3 mmol K 2 CO 3 , 50mL of N-methylpyrrolidone and 20mL of toluene, blow in nitrogen to expel the air, raise the temperature to 140°C, react for 5h to remove water, then raise the temperature to 170°C for 2h to obtain a viscous solution, precipitate and wash in deionized water, and then use Wash with water and ethanol, and dry in vacuum to obtain double bond polyethersulfone; 1 H NMR spectrum see figure 1 .
[0037] (2) Synthesis of carboxyl-modified polyethersulfone:
[0038]Mix 1g of double bond polyethersulfone obtained in step (1), 0.1g of thioglycolic acid, 0.5g of 2,2-dimethoxy-2-phenylacetophenone and 20ml of N,N-dimethylformamide , stir to dissolve...
Embodiment 2
[0045] A method for preparing a large-flux carboxyl polyethersulfone loose nanofiltration membrane, comprising the steps of:
[0046] (1) Synthesis of double bond polyethersulfone:
[0047] Add 5mmol 3,3'-diallyl-4,4'-dihydroxydiphenylsulfone, 10mmol 4,4'-dihydroxydiphenylsulfone, 10mmol 4,4'-difluorodiphenylsulfone, 30mmol Na 2 CO 3 , 100mL of N,N-dimethylformamide and 20mL of benzene, pass nitrogen gas to expel the air, raise the temperature to 110°C, react for 2h to remove water, then raise the temperature to 200°C for 1h to obtain a viscous solution, precipitate and wash in deionized water , and then washed with absolute ethanol, and dried in vacuum to obtain double bond polyethersulfone;
[0048] (2) Synthesis of carboxyl-modified polyethersulfone:
[0049] 1g of the double bond polyethersulfone obtained in step (1), 1g of mercaptosuccinic acid, 0.1g of 2,2-dimethoxy-2-phenylacetophenone and 10mL of N,N-dimethylacetamide, Mix, stir to dissolve, pass in nitrogen gas t...
Embodiment 3
[0056] A method for preparing a large-flux carboxyl polyethersulfone loose nanofiltration membrane, comprising the steps of:
[0057] (1) Synthesis of double bond polyethersulfone:
[0058] Add 8mmol 3,3'-diallyl-4,4'-dihydroxydiphenylsulfone, 20mmol 4,4'-dihydroxydiphenylsulfone, 40mmol 4,4'-difluorodiphenylsulfone, 30mmol Na 2 CO 3 , 160mL of N,N-dimethylacetamide, and 40mL of toluene, pass nitrogen to expel the air, raise the temperature to 160°C, react for 2h to remove water, then raise the temperature to 180°C for 24h to obtain a viscous solution, precipitate in deionized water and washing, then washing with absolute ethanol, and vacuum drying to obtain double bond polyethersulfone;
[0059] (2) Synthesis of carboxyl-modified polyethersulfone:
[0060] Mix 3g of double-bond polyethersulfone obtained in step (1), 1g of mercaptopropionic acid, 1g of 2,2-dimethoxy-2-phenylacetophenone and 40mL of N-methylpyrrolidone, stir and dissolve, pass Enter nitrogen gas and discha...
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