Preparation method of nano inorganic-organic nano-filtration membrane

Abstract

The invention relates to a preparation method of a nano inorganic-organic nano-filtration membrane, and belongs to the technical field of nano-filtration membrane preparation. The preparation method comprises the following steps: putting cellulose acetate into dichloromethane, stirring to obtain a casting solution; painting the casting solution on a glass plate to form a wet membrane with a thickness of 280 [mu]m, allowing the wet membrane to stand still for 20-23 minutes, then soaking the glass plate in deionized water with a temperature of 20-23 DEG C for 10 to 15 minutes so as to obtain an asymmetric membrane; subjecting the asymmetric membrane to exchange treatments in a methanol solution and cyclohexane in sequence so as to obtain a cellulose acetate nano-filtration flat wet membrane; soaking the obtained wet membrane in a silver nitrate solution for 20 to 30 minutes, washing so as to obtain a composite wet membrane; paving the composite wet membrane on an insulation surface, radiating the upper surface of the composite wet membrane by argon ion laser beams for 15 to 25 minutes so as to obtain the target product. The permeation flux of the membrane prepared by the provided preparation method will increase when the temperature is rising.

Description

technical field

[0001] The invention relates to a method for preparing a nano-inorganic-organic composite nanofiltration membrane, belonging to the technical field of nanofiltration membrane preparation. Background technique

[0002] Membrane separation technology is an emerging discipline produced by the cross-combination and interpenetration of many disciplines such as materials, chemical engineering and process engineering. It is an important high-tech solution to contemporary energy, resource and environmental problems. The application of nano-inorganic-organic composite membranes in membrane separation technology is particularly prominent. Because nanoparticles have the characteristics of large specific surface area, highly activated surface active atoms, and strong interfacial interaction with polymers, using inorganic nanoparticles as a reinforcing phase to uniformly disperse them in the organic host phase can improve the interaction with the matrix. The interface is...

Examples

Embodiment 1

[0018] Put cellulose acetate into dichloromethane and stir for 21 hours, then add water and stir for 3 hours, and then let it stand for 64 hours to obtain a casting solution;

[0019] Hang the above-mentioned casting solution on a glass plate to form a wet film of 280 μm in size. The wet film was left to stand in air at 26°C and a relative humidity of 65% for 23 minutes, and then immersed in deionized water at 23°C for 15 minutes to obtain an asymmetric film. ;

[0020] The asymmetric membrane is sequentially subjected to methanol solution with a volume concentration of 58%, and cyclohexane exchange treatment to obtain a cellulose acetate nanofiltration flat wet membrane;

[0021] Soak the cellulose acetate nanofiltration plate wet membrane in silver nitrate solution for 20 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0022] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a conti...

Embodiment 2

[0024] Put cellulose acetate into dichloromethane and stir for 19 hours, then add water and stir for 2 hours, and then let it stand for 60 hours to obtain a casting solution;

[0025] Hang the above-mentioned casting solution on a glass plate to make a 280 μm wet film, and let the wet film stand in air at 20°C and a relative humidity of 60% for 20 minutes, and then soak it in deionized water at 20°C for 10 minutes to obtain an asymmetric film ;

[0026] The asymmetric membrane is sequentially exchanged with a methanol solution with a volume concentration of 53% and cyclohexane to obtain a flat wet membrane of cellulose acetate nanofiltration;

[0027] Soak the cellulose acetate nanofiltration plate wet membrane in silver nitrate solution for 20 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0028] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a continuous argon ion laser beam (wa...

Embodiment 3

[0030] Put cellulose acetate into dichloromethane and stir for 21 hours, then add water and stir for 3 hours, and then let it stand for 60 hours to obtain a casting solution;

[0031] Hang the above-mentioned casting solution on a glass plate to make a 280 μm wet film, and let the wet film stand in air at 20°C and a relative humidity of 60% for 20 minutes, and then soak it in deionized water at 20°C for 10 minutes to obtain an asymmetric film ;

[0032] The asymmetric membrane is sequentially exchanged with a methanol solution with a volume concentration of 53% and cyclohexane to obtain a flat wet membrane of cellulose acetate nanofiltration;

[0033] Soak the cellulose acetate nanofiltration plate wet membrane with silver nitrate solution for 30 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0034] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a continuous argon ion laser beam (...

technical field

[0001] The invention relates to a method for preparing a nano-inorganic-organic composite nanofiltration membrane, belonging to the technical field of nanofiltration membrane preparation. Background technique

[0002] Membrane separation technology is an emerging discipline produced by the cross-combination and interpenetration of many disciplines such as materials, chemical engineering and process engineering. It is an important high-tech solution to contemporary energy, resource and environmental problems. The application of nano-inorganic-organic composite membranes in membrane separation technology is particularly prominent. Because nanoparticles have the characteristics of large specific surface area, highly activated surface active atoms, and strong interfacial interaction with polymers, using inorganic nanoparticles as a reinforcing phase to uniformly disperse them in the organic host phase can improve the interaction with the matrix. The interface is...

Examples

Embodiment 1

[0018] Put cellulose acetate into dichloromethane and stir for 21 hours, then add water and stir for 3 hours, and then let it stand for 64 hours to obtain a casting solution;

[0019] Hang the above-mentioned casting solution on a glass plate to form a wet film of 280 μm in size. The wet film was left to stand in air at 26°C and a relative humidity of 65% for 23 minutes, and then immersed in deionized water at 23°C for 15 minutes to obtain an asymmetric film. ;

[0020] The asymmetric membrane is sequentially subjected to methanol solution with a volume concentration of 58%, and cyclohexane exchange treatment to obtain a cellulose acetate nanofiltration flat wet membrane;

[0021] Soak the cellulose acetate nanofiltration plate wet membrane in silver nitrate solution for 20 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0022] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a conti...

Embodiment 2

[0024] Put cellulose acetate into dichloromethane and stir for 19 hours, then add water and stir for 2 hours, and then let it stand for 60 hours to obtain a casting solution;

[0025] Hang the above-mentioned casting solution on a glass plate to make a 280 μm wet film, and let the wet film stand in air at 20°C and a relative humidity of 60% for 20 minutes, and then soak it in deionized water at 20°C for 10 minutes to obtain an asymmetric film ;

[0026] The asymmetric membrane is sequentially exchanged with a methanol solution with a volume concentration of 53% and cyclohexane to obtain a flat wet membrane of cellulose acetate nanofiltration;

[0027] Soak the cellulose acetate nanofiltration plate wet membrane in silver nitrate solution for 20 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0028] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a continuous argon ion laser beam (wa...

Embodiment 3

[0030] Put cellulose acetate into dichloromethane and stir for 21 hours, then add water and stir for 3 hours, and then let it stand for 60 hours to obtain a casting solution;

[0031] Hang the above-mentioned casting solution on a glass plate to make a 280 μm wet film, and let the wet film stand in air at 20°C and a relative humidity of 60% for 20 minutes, and then soak it in deionized water at 20°C for 10 minutes to obtain an asymmetric film ;

[0032] The asymmetric membrane is sequentially exchanged with a methanol solution with a volume concentration of 53% and cyclohexane to obtain a flat wet membrane of cellulose acetate nanofiltration;

[0033] Soak the cellulose acetate nanofiltration plate wet membrane with silver nitrate solution for 30 minutes, and then wash it with deionized water to obtain a composite wet membrane;

[0034] Attach the composite wet film on the insulating surface, and irradiate the upper surface of the film with a continuous argon ion laser beam (...