Preparation method for polyisophthaloyl metaphenylene diamine nanofiltration membrane

Abstract

The invention provides a preparation method for a polyisophthaloyl metaphenylene diamine nanofiltration membrane and belongs to the field of membrane pollution resistance. The method includes the steps that a fully-dried polyisophthaloyl metaphenylene diamine nanofiltration membrane is flatly laid on a glass plate, the glass plate is placed in a plate frame to be tightened, a prepared solution containing an acid binding agent is poured to the surface of the membrane for impregnation, the remaining solution is poured out, and the membrane is placed in a fume cupboard to be dried in shade; then a prepared crosslinking solution is poured to the surface of the membrane for impregnation, and the surplus solution is removed through a silica gel wheel; then an oxidized graphene solution is poured to the surface of the membrane for impregnation, the remaining solution is poured out, and the membrane is dried in shade; finally the treated membrane is placed within the temperature interval of 40-80 DEG C for heat treatment for 60-180 s, and the modified nanofiltration membrane is obtained. The technological operation is easy, the original excellent characteristics of the polyisophthaloyl metaphenylene diamine nanofiltration membrane are kept, the hydrophilia of the surface of the membrane is also well enhanced, the pollution resistance of the membrane is improved, and wide application prospects are achieved.

Description

technical field

[0001] The invention relates to a method for modifying nanofiltration membranes, in particular to a method for improving the anti-pollution performance of poly-m-phenylene isophthalamide nanofiltration membranes through graphene oxide, and belongs to the field of anti-pollution membranes. Background technique

[0002] Nanofiltration has attracted more and more attention due to its unique separation characteristics. The performance of nanofiltration membranes is between reverse osmosis and ultrafiltration membranes, and it is especially suitable for separating pollutants and divalent , high-priced inorganic salts, etc., and can retain some monovalent ions that are beneficial to the human body. It plays a unique role in drinking water purification, wastewater treatment, classification and concentration of biochemical products, food industry and many other fields, showing a good application prospect.

[0003] Membrane fouling is a practical problem that has to ...

Examples

Embodiment 1

[0017] (1) Preparation of the cross-linking solution, adding 0.1 g of trimesic tricarboxamide into 99.9 g of Isopar-G solvent, stirring and mixing evenly to obtain a cross-linking solution with a mass fraction of 0.1%.

[0018] (2) Configuration of graphene oxide solution, 1.5 g of processed graphene oxide nanosheets were dissolved in 98.5 g of Ispoar-G solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 1.5%.

[0019] (3) Spread the fully dry polym-phenylene isophthalamide nanofiltration membrane flatly on a glass plate, place it in the plate frame and tighten it, and pour the 0.1wt% triethylamine solution configured on its surface, Immerse for 5 minutes, pour off the remaining solution, and place it in a fume hood to dry in the shade. Then pour the prepared glutaraldehyde solution on the surface, soak for 15 minutes, remove excess solution with a silica gel roller, pour the graphene oxide solution on the s...

Embodiment 2

[0021] (1) Preparation of the cross-linking solution. Add 0.15 g of trimesic tricarboxamide to a mixed solution of dehydrated 85 g of n-hexane and 14.85 g of dichloromethane, stir and mix well to obtain a cross-linking solution with a mass fraction of 0.15%.

[0022] (2) Configuration of the graphene oxide solution, 0.1 g of the treated graphene oxide nanosheets was dissolved in 99.9 g of dichloromethane solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 0.1%.

[0023] (3) Spread the fully dried polym-phenylene isophthalamide nanofiltration membrane flatly on a glass plate, place it in a plate frame and tighten it, pour 0.2wt% potassium carbonate solution on its surface, and soak 1min, pour off the remaining solution, and place it in a fume hood to dry in the shade; then pour the prepared trimesoyl chloride (TMC) solution on the surface, soak for 2min, remove the excess solution with a silica gel roller, and...

Embodiment 3

[0025] (1) Preparation of the cross-linking solution, adding 0.3 g of trimesic tricarboxamide into 99.7 g of dehydrated n-hexane solvent, stirring and mixing evenly to obtain a cross-linking solution with a mass fraction of 0.3%.

[0026] (2) Configuration of the graphene oxide solution, 3 g of the treated graphene oxide nanosheets were dissolved in 97 g of dimethylacetamide solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 3%.

[0027] (3) Lay the fully dried polym-phenylene isophthalamide nanofiltration membrane flat on a glass plate, place it in a plate frame and tighten it, pour 0.3wt% potassium carbonate solution on its surface, and soak After 10 minutes, pour off the remaining solution and place it in a fume hood to dry in the shade. Then pour the prepared trimesoyl chloride (TMC) solution on the surface, soak for 10 minutes, remove excess solution with a silica gel roller, pour the graphene oxide so...

technical field

[0001] The invention relates to a method for modifying nanofiltration membranes, in particular to a method for improving the anti-pollution performance of poly-m-phenylene isophthalamide nanofiltration membranes through graphene oxide, and belongs to the field of anti-pollution membranes. Background technique

[0002] Nanofiltration has attracted more and more attention due to its unique separation characteristics. The performance of nanofiltration membranes is between reverse osmosis and ultrafiltration membranes, and it is especially suitable for separating pollutants and divalent , high-priced inorganic salts, etc., and can retain some monovalent ions that are beneficial to the human body. It plays a unique role in drinking water purification, wastewater treatment, classification and concentration of biochemical products, food industry and many other fields, showing a good application prospect.

[0003] Membrane fouling is a practical problem that has to ...

Examples

Embodiment 1

[0017] (1) Preparation of the cross-linking solution, adding 0.1 g of trimesic tricarboxamide into 99.9 g of Isopar-G solvent, stirring and mixing evenly to obtain a cross-linking solution with a mass fraction of 0.1%.

[0018] (2) Configuration of graphene oxide solution, 1.5 g of processed graphene oxide nanosheets were dissolved in 98.5 g of Ispoar-G solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 1.5%.

[0019] (3) Spread the fully dry polym-phenylene isophthalamide nanofiltration membrane flatly on a glass plate, place it in the plate frame and tighten it, and pour the 0.1wt% triethylamine solution configured on its surface, Immerse for 5 minutes, pour off the remaining solution, and place it in a fume hood to dry in the shade. Then pour the prepared glutaraldehyde solution on the surface, soak for 15 minutes, remove excess solution with a silica gel roller, pour the graphene oxide solution on the s...

Embodiment 2

[0021] (1) Preparation of the cross-linking solution. Add 0.15 g of trimesic tricarboxamide to a mixed solution of dehydrated 85 g of n-hexane and 14.85 g of dichloromethane, stir and mix well to obtain a cross-linking solution with a mass fraction of 0.15%.

[0022] (2) Configuration of the graphene oxide solution, 0.1 g of the treated graphene oxide nanosheets was dissolved in 99.9 g of dichloromethane solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 0.1%.

[0023] (3) Spread the fully dried polym-phenylene isophthalamide nanofiltration membrane flatly on a glass plate, place it in a plate frame and tighten it, pour 0.2wt% potassium carbonate solution on its surface, and soak 1min, pour off the remaining solution, and place it in a fume hood to dry in the shade; then pour the prepared trimesoyl chloride (TMC) solution on the surface, soak for 2min, remove the excess solution with a silica gel roller, and...

Embodiment 3

[0025] (1) Preparation of the cross-linking solution, adding 0.3 g of trimesic tricarboxamide into 99.7 g of dehydrated n-hexane solvent, stirring and mixing evenly to obtain a cross-linking solution with a mass fraction of 0.3%.

[0026] (2) Configuration of the graphene oxide solution, 3 g of the treated graphene oxide nanosheets were dissolved in 97 g of dimethylacetamide solvent, and ultrasonic treatment was used to disperse evenly to obtain a graphene oxide solution with a mass fraction of 3%.

[0027] (3) Lay the fully dried polym-phenylene isophthalamide nanofiltration membrane flat on a glass plate, place it in a plate frame and tighten it, pour 0.3wt% potassium carbonate solution on its surface, and soak After 10 minutes, pour off the remaining solution and place it in a fume hood to dry in the shade. Then pour the prepared trimesoyl chloride (TMC) solution on the surface, soak for 10 minutes, remove excess solution with a silica gel roller, pour the graphene oxide so...