A preparation method of anti-clogging and antibacterial charged nanofiltration membrane

A nanofiltration membrane and anti-clogging technology, which is applied in the field of ultrafiltration, can solve the problems of membrane pollution, reduce membrane flux, and blockage of membrane pores by inorganic substances, and achieve the effects of strengthening membrane pore strength, excellent adsorption, and improving fouling resistance

Active Publication Date: 2020-06-16
深圳市益嘉昇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problems that the existing charged nanofiltration membranes are susceptible to membrane fouling, causing inorganic substances to block the membrane pores, and biomass loading on the membrane surface to form a biofilm to reduce the membrane flux, an anti-clogging membrane is provided. Preparation method of antibacterial charged nanofiltration membrane

Method used

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  • A preparation method of anti-clogging and antibacterial charged nanofiltration membrane

Examples

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Effect test

example 1

[0016] First weigh 10g of silver nitrate and 60mL of deionized water and place them in a 500mL three-necked flask. After stirring and mixing for 10 minutes, add 25mL of 10% ammonia solution by mass fraction to the three-necked flask dropwise, and control the dropping rate at 1mL / min. After completion, stir and mix at room temperature for 10 minutes to prepare a silver ammonia solution; add polyvinyl alcohol to a mass fraction of 8% sodium hydroxide solution at a mass ratio of 1:8, stir and mix and place in an Erlenmeyer flask to prepare a base body fluid, and then add the silver ammonia solution dropwise to the base liquid according to the mass ratio of 3:2, and control the dropping time for 1h. After washing with ethanol for 3 times, dry at 75°C for 6 hours to prepare nano-silver oxide; select hectorite, crush and grind it, and pass through a 200-mesh sieve to obtain hectorite powder, which is then weighed in parts by weight. Measure 45 parts of dodecylamine, 15 parts of nano...

example 2

[0019]First weigh 13g of silver nitrate and 65mL of deionized water and put them in a 500mL three-necked flask. After stirring and mixing for 13 minutes, add 28mL of 10% ammonia solution dropwise to the three-necked flask, and control the dropping rate at 2mL / min. After completion, stir and mix at room temperature for 13 minutes to prepare a silver ammonia solution; add polyvinyl alcohol to a mass fraction of 8% sodium hydroxide solution at a mass ratio of 1:8, stir and mix and place in an Erlenmeyer flask to prepare a base body fluid, and then add the silver ammonia solution dropwise to the base liquid according to the mass ratio of 3:2, and control the dropping time for 2 hours. After washing with ethanol for 4 times, dry at 78°C for 7 hours to prepare nano-silver oxide; select hectorite, pulverize and grind it, and pass through a 200-mesh sieve to obtain hectorite powder, which is then weighed in parts by weight. Measure 48 parts of dodecylamine, 18 parts of nano-silver oxi...

example 3

[0022] First weigh 15g of silver nitrate and 70mL of deionized water and put them in a 500mL three-neck flask. After stirring and mixing for 15 minutes, add 30mL of 10% ammonia solution dropwise to the three-necked flask, and control the dropping rate at 2mL / min. After completion, stir and mix at room temperature for 15 minutes to prepare a silver ammonia solution; add polyvinyl alcohol to a mass fraction of 8% sodium hydroxide solution at a mass ratio of 1:8, stir and mix and place in an Erlenmeyer flask to prepare a base Body fluid, then add the silver ammonia solution dropwise to the base liquid according to the mass ratio of 3:2, and control the dropping time for 2 hours. After washing with ethanol for 5 times, dry at 80°C for 8 hours to prepare nano-silver oxide; select hectorite, pulverize and grind it, pass through a 200-mesh sieve to obtain hectorite powder, and then weigh them in parts by weight. Measure 50 parts of dodecylamine, 20 parts of nano-silver oxide, 20 part...

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Abstract

The invention belongs to the field of ultrafiltration technology and specifically relates to a preparation method of an anti-clogging bacteriostatic charged nanofiltration membrane. According to the invention, hectorite and a surfactant and ethyl orthosilicate are compounded to form a stable porous heterogeneous material, a supporting material hectorite crystal is a lamellar structure formed by two layers of silica tetrahedron and an interlayer of magnesia octahedron; lamella has strong electron deficiency and bears a negative charge and has excellent adsorption and ion exchange properties; nano-silver oxide is embedded into the lamella, and modified inorganic particles are prepared; the inorganic particles are dispersed and a charged nanofiltration membrane is prepared; silver oxide powder is roasted and then decomposed into elemental silver; the elemental silver is used for selective catalytic reaction and reinforcement of inner pores of the charged nanofiltration membrane, and microbe loading is inhibited, membrane pore strength is effectively reinforced, anti-pollution performance of the charged nanofiltration membrane is improved and microbial reproduction is inhibited to prevent formation of a biomembrane. The preparation method has a wide use prospect.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration, and in particular relates to a preparation method of an anti-clogging and antibacterial charged nanofiltration membrane. Background technique [0002] The conventional membrane filtration separation process is based on a physical sieving principle, that is, the membrane allows components smaller than its pore size to pass through and retains components larger than its pore size or with a similar pore size. As the particle size of the medium to be separated decreases, the pore size of the membrane used must also decrease accordingly, which will inevitably lead to problems such as decreased flux and increased operating costs. Charged nanofiltration membrane is another new type of filtration membrane developed in recent years. There are fixed charges on the inner and outer surfaces. According to its separation and filtration principle, in addition to the physical sieving of neutral membranes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/02C02F1/44
CPCB01D61/027B01D67/0002B01D69/02C02F1/442C02F2101/308C02F2103/30
Inventor 张文飞王艳芹
Owner 深圳市益嘉昇科技有限公司
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