CN1899679A - Asynmmetric porous ceramic super filter film and its preparing method - Google Patents
Asynmmetric porous ceramic super filter film and its preparing method Download PDFInfo
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Abstract
The present invention relates to asymmetric porous ceramic ultra-filtering membrane and its preparation process. The asymmetric porous ceramic ultra-filtering membrane in high permeability is prepared with nanometer metal oxide fiber to replace conventionally used metal oxide grain as the transition layer and separation layer film material, and porous alpha-alumina ceramic substrate. Compared with available ceramic ultra-filtering membrane prepared with nanometer or micron metal oxide grain, the asymmetric porous ceramic ultra-filtering membrane prepared with nanometer metal oxide fiber has a two times higher pure water permeability.
Description
Technical field
The present invention relates to asymmetric porous ceramic ultra-filtering membrane and preparation method thereof, the membrane material of making transition zone and separating layer with the nano-metal-oxide fiber prepares asymmetric porous ceramic ultra-filtering membrane, make the corresponding ceramic super-filtering film of the membrane material preparation of transition zone and separating layer with nanometer or micron metal oxide particle and compare, have high permeability.
Background technology
Compare with organic polymer films, high temperature resistant, advantages such as chemical stability good, mechanical strength is high, anti-microbe ability is strong, long service life that inoranic membrane has, thereby the inoranic membrane technical development is rapid closely during the last ten years, becomes the focus of membrane technology research in the world and application and development.The asymmetric porous ceramic filter membrane is the wide and more inoranic membrane of research and development of purposes, and its structure generally constitutes by three layers: ceramic matrix is that supporter, transition zone are that intermediate layer and separating layer are top layer.Its preparation forming method ceramic matrix mainly contains the solid particle sintering process, and transition zone and separating layer mainly contain suspended particles method, sol-gel process, chemical vapour deposition technique, hydro-thermal method etc.Used material of preparing is graininess pottery or metal oxide, and commonly used is alumina granules.But this asymmetric porous ceramic filter membrane thickness is thicker, and generally greater than 2mm, this compares with the organic polymer films of thinner thickness, and under separating layer aperture situation, separate object and operating condition same case, the former permeability is obviously low.So how improving asymmetric porous ceramic filter membrane permeability is an important subject, is used for the problem that production practices need solve especially.The metal film of different shape membrane material preparation (filters and separates, 1998 (4): 35) filter performance test shows, the metallic fiber sintered felt filter efficiency than the high 2-5 of metal powder sintered filter material doubly, the high 2-10 of porosity doubly, can this have proposed enlightenment for the preparation of high permeability porous ceramics filter membrane: use metal-oxide fiber, particularly make transition zone and separating layer membrane material preparation high permeability asymmetric porous ceramic ultra-filtering membrane with the nano-metal-oxide fiber.Multiple nano-metal-oxide fiber succeeds in developing that (ZL 02139370.2; ZL 02139369.9; Chem.Commun., 2004,1428-1429; J.Phys.Chenm.B 2005,109,19169-19174), created condition for the preparation of high permeability porous ceramics filter membrane.
Summary of the invention
The object of the invention provides a kind of asymmetric porous ceramic ultra-filtering membrane and preparation method thereof, and it is to make transition zone and separating layer membrane material with the nano-metal-oxide fiber, the preparation asymmetric porous ceramic ultra-filtering membrane.Make transition zone and separating layer membrane material with nanometer or micron metal oxide particle, the corresponding asymmetric ceramic super-filtering film of preparation is compared, and has high permeability.Thereby the more favourable industry fields such as bio-pharmaceuticals, food and drink, chemical industry environmental protection that are widely used in.
Asymmetric porous ceramic ultra-filtering membrane provided by the invention, the material of ceramic matrix is an Alpha-alumina, its profile is flat board or tubular type or multichannel, thickness 2-4mm, aperture 0.8-1.2 μ m; The material of asymmetric porous ceramic ultra-filtering membrane transition zone is the nano-metal-oxide fiber, number of plies 1-5 layer, gross thickness 10-80 μ m, every layer thickness 10-25 μ m, aperture, top layer 150-190nm; The material of separating layer is the nano-metal-oxide fiber, number of plies 1-2 layer, gross thickness 5-10 μ m, every layer thickness 3-7 μ m, top layer aperture 5-100nm.
The nano-metal-oxide fiber of described transition zone is that the nano oxidized fibres of aluminium, titanium and cerium is a kind of, or theirs is compound; The nano-metal-oxide fiber of separating layer is that the nano oxidized fibres of aluminium, titanium and cerium is a kind of, or theirs is compound.
The preparation method of described asymmetric porous ceramic ultra-filtering membrane is through following step: the nano-metal-oxide fiber dispersion in water, under 60-90 ℃, is added HCl or HNO
3Dispersant is made the nano-metal-oxide fibrous suspension, adds additive (plasticizer and binding agent) again and is made into coating liquid, be immersed on the ceramic matrix surface, and drying, transition zone or separating layer perforated membrane are made in roasting.
Described nano-metal-oxide fiber is: suspension and coating liquid that the nano-metal-oxide fiber of diameter 5-20nm, fineness ratio 1: 10-60 is prepared are used to be immersed in the ceramic matrix surface, the preparation transition zone; Suspension and coating liquid that the nano-metal-oxide fiber of diameter 3-10nm, fineness ratio 1: 5-30 is prepared are used to be immersed in ceramic matrix transition zone surface, preparation asymmetric porous ceramic ultra-filtering membrane separating layer.
The binding agent of described additive is methylcellulose or polyvinyl alcohol, and plasticizer is polyvinyl alcohol or polyethylene glycol.
Nano-metal-oxide fiber content 1.0-2.5% (wt%) in the described coating liquid, additive total content 0.2-1.0% (wt%), plasticizer and binding agent mass ratio 1: 3-5 in the additive.
The described ceramic matrix surface that is immersed in is that the coating liquid dipping of single nano-metal-oxide fibrous suspension is filmed or the suspension mixed coating liquid dipping of two or more nano-metal-oxide fiber is filmed.
The transition zone of described asymmetric porous ceramic ultra-filtering membrane or separating layer perforated membrane drying, roasting process are: after at room temperature airing 10-30 hour, be warming up to 300-400 ℃ with 0.1-5 ℃ of/minute speed, constant temperature 2-3 hour, continuation is warming up to 500-800 ℃ with 0.1-3 ℃ of/minute speed, roasting 1-4 hour, the back is cooling naturally.
In the asymmetric porous ceramic filter membrane, general ceramic matrix is thick in 2mm, average pore size 1-10 μ m.About transition zone and separating layer total thickness 100 μ m, average pore size is (micro-filtration membrane 1000-100nm below 1000nm, milipore filter 100-5nm, NF membrane＜5nm) is so there is considerable influence in the aperture of ceramic matrix, porosity to the permeability of asymmetric porous ceramic filter membrane.Because the ceramic matrix average pore size is bigger, usually take the bridge formation method, film as membrane material greater than the metal oxide in form of particles of matrix average pore size with diameter, but bulky grain sintering difficulty, have a strong impact on film strength, use than granule and make membrane material, in being coated with membrane process, easily fall in the matrix hole, block the active hole of matrix, reduce asymmetric porous ceramic filter membrane permeability.
The general diameter 3-30nm of nano-metal-oxide fiber that the present invention is used, very high fineness ratio is arranged, select fibre length to be slightly larger than the matrix average pore size, film, form three-dimensional labyrinth type film with the bridge formation method, not only be difficult for falling in the matrix hole, and fiber has more contact points, welds together when sintering, and is opposite with particle system film, fiber system film had both increased film strength, had also improved permeability.
For relatively, under the same conditions, use nanometer γ-Al
2O
3Fiber is that membrane material prepares asymmetric porous ceramic ultra-filtering membrane (fiber), with micron γ-Al
2O
3Particle is that membrane material prepares asymmetric porous ceramic ultra-filtering membrane (particle), has carried out performance test simultaneously.Test result shows: both ceramic matrix thickness is identical with average pore size, and transition zone and the separating layer dipping number of times of filming is identical, and each dip time is identical, and the film average thickness differs＜and 9%.The top layer average pore size differs＜and 8%, the average pure water permeability rate of asymmetric porous ceramic ultra-filtering membrane (fiber) is than more than the high twice of asymmetric porous ceramic ultra-filtering membrane (particle).
In order to confirm to prepare γ-Al in the used coating liquid of asymmetric porous ceramic ultra-filtering membrane
2O
3Particle and γ-Al
2O
3The fiber different-shape, with Prepared by Sol Gel Method graininess and fibrous nano boehmite (film of γ-AlOOH) carries out tem analysis (seeing Fig. 1 and Fig. 2).
Survey average thickness (water technology, 1996 (3): 129) of film with the weightening finish method.Measure asymmetric porous ceramic filter membrane average pore size and average pure water permeability rate with bubble platen press and flow rate of liquid method.
Asymmetric porous ceramic ultra-filtering membrane provided by the invention and preparation method thereof is to make transition zone and separating layer membrane material with the nano-metal-oxide fiber, the preparation asymmetric porous ceramic ultra-filtering membrane, make transition zone and separating layer membrane material with nanometer or micron metal oxide particle, the corresponding asymmetric ceramic super-filtering film of preparation is compared, has high permeability, more than the average high twice of pure water permeability rate, thereby the more favourable industry fields such as bio-pharmaceuticals, food and drink, chemical industry environmental protection that are widely used in.
Description of drawings
Fig. 1 is the TEM photo of the formed no supporter film of nano-alumina fiber colloidal sol.
Fig. 2 is the TEM photo of the formed no supporter film of nano alumina particles colloidal sol.
The specific embodiment
Various nano-metal-oxide fibers are by Hydrothermal Preparation, and concrete preparation method consults relevant document.Nanometer γ-Al
2O
3Fiber: ZL 02139370.2; Nano hydrated titania fiber (TiO
2H
2O): ZL 02139369.9; Nano-cerium oxide fiber: J.Phys.Chenm.B 2005,109,19169-19174.
The asymmetric porous ceramic ultra-filtering membrane transition zone perforated membrane preparation that following examples are used.Matrix is α-Al
2O
3Pottery garden sheet, diameter 40mm, thick 4mm, average pore size 0.9 μ m.The transition zone material is nanometer γ-Al
2O
3Fiber, its preparation method is: with 2.0 gram average diameter 20nm, long 900-1100nm nanometer γ-Al
2O
3Fiber dispersion is (both mass ratioes are 2.0: 100) in deionized water, under 85 ℃, add an amount of HNO
3Dispersant (H
+/ Al
3+=0.04: 1), electromagnetic agitation is made nanometer γ-Al about 4 hours
2O
3Fibrous suspension adds binding agent methylcellulose and plasticizer polyvinyl alcohol and is made into coating liquid, nanometer γ-Al
2O
3Fiber content 1.4% (wt%), additive total amount 0.4% (wt%), methylcellulose and polyvinyl alcohol mass ratio are 1: 4 in the additive.To make coating liquid is immersed on the ceramic matrix surface immediately, at room temperature airing is after 15 hours, be warming up to 350 ℃ with 0.5 ℃ of/minute speed, constant temperature 2 hours, continuation is warming up to 550-650 ℃ with 1 ℃ of/minute speed, roasting 3 hours, and the back is cooling naturally, make the transition zone perforated membrane, film average thickness 23 μ m.Along with being warming up to the maximum temperature difference, gained transition zone perforated membrane average pore size is in the 160-180nm scope.
The transition zone material can also be nanometer titanium dioxide fiber or nano-cerium oxide fiber.
Embodiment 1: asymmetric porous gamma-Al
2O
3The ceramic super-filtering film preparation
With 2.0 gram average diameter 6nm, long 170-190nm nanometer γ-Al
2O
3Fiber dispersion is (both mass ratioes are 2.0: 100) in deionized water, under 85 ℃, add an amount of HNO
3Dispersant (H
+/ Al
3+=0.04: 1), electromagnetic agitation is made nanometer γ-Al about 4 hours
2O
3Fibrous suspension adds binding agent methylcellulose and plasticizer polyvinyl alcohol and is made into coating liquid, nanometer γ-Al
2O
3Fiber content 1.4% (wt%), additive total amount 0.4% (wt%), methylcellulose and polyvinyl alcohol mass ratio are 1: 4 in the additive.To make coating liquid is immersed on ceramic matrix transition zone (average pore size 170nm) surface immediately, at room temperature airing is after 15 hours, be warming up to 350 ℃ with 0.5 ℃ of/minute speed, constant temperature 2 hours continues to be warming up to 600 ℃ with 1 ℃ of/minute speed, roasting 3 hours, the back is cooling naturally, make separating layer membrane average thickness 7.0 μ m, the asymmetric porous ceramic ultra-filtering membrane of average pore size 65nm, average pure water permeability rate 7.0 * 10
-3L/m
2HPa.
For relatively, prepare asymmetric porous ceramic ultra-filtering membrane graininess γ-Al
2O
3Transition zone and separating layer perforated membrane.Its preparation method is: under heating (82 ℃) and high-speed stirred, making the abundant hydrolysis of aluminium isopropoxide form boehmite (is γ-AlOOH) precipitate (1).100 ℃ down oven dry be warming up to 450 ℃ with 2 ℃ of/minute speed after 2 hours, constant temperature 3 hours makes the γ-Al of 1-2 μ m particle diameter
2O
3Particle.With 2.0 these γ-Al of gram
2O
3Particle is dispersed in (both mass ratioes are 2.0: 100) in the deionized water, under 85 ℃, adds an amount of HNO
3Dispersant (H
+/ Al
3+=0.04: 1), electromagnetic agitation (800-900r/min) is made the γ-Al about average grain diameter 1 μ m about 4 hours
2O
3Suspension adds binding agent methylcellulose and plasticizer polyvinyl alcohol and is made into coating liquid, γ-Al
2O
3Granule content 1.4% (wt%), additive total amount 0.4% (wt%), methylcellulose and polyvinyl alcohol mass ratio are 1: 4 in the additive.To make coating liquid and be immersed in α-Al immediately
2O ceramic matrix (garden sheet diameter 40mm, thick 4mm, average pore size 0.9 μ m) on the surface, at room temperature airing is after 15 hours, be warming up to 350 ℃ with 0.5 ℃ of/minute speed, constant temperature 2 hours continues to be warming up to 600 ℃ with 1 ℃ of/minute speed, roasting 3 hours, the back is cooling naturally, make the transition zone perforated membrane, film average thickness 22 μ m, film average pore size 180nm.(2) with the above-mentioned γ-Al that makes
2O
3Powder, under the same conditions, electromagnetic agitation (1400-1600r/min) was made the γ-Al about average grain diameter 190nm about 4 hours
2O
3Suspension, after being made into coating liquid, be immersed in immediately on above-mentioned ceramic matrix transition zone (average pore size 180nm) surface for preparing, at room temperature airing is after 15 hours, be warming up to 350 ℃ with 0.5 ℃ of/minute speed, constant temperature 2 hours continues to be warming up to 550 ℃ with 1 ℃ of/minute speed, roasting 3 hours, the back is cooling naturally, make separating layer membrane average thickness 6.5 μ m, the asymmetric porous ceramic ultra-filtering membrane of average pore size 60nm, average pure water permeability rate 2.7 * 10
-3L/m
2HPa.
From Fig. 1 and Fig. 2 TEM photo, obviously find out the difference of both patterns.Embodiment 1 just prepares transition zone and separating layer asymmetric porous ceramic ultra-filtering membrane (fiber) and asymmetric porous ceramic ultra-filtering membrane (particle) with these two kinds of membrane materials.Both ceramic matrix thickness is identical with average pore size, and transition zone and the separating layer dipping number of times of filming is identical, and each dip time is identical, and the film average thickness differs＜and 9%.The top layer average pore size differs＜and 8%, the former average pure water permeability rate is than more than the high twice of the latter.
Embodiment 2: asymmetric porous ceramic Al
2O
3-TiO
2The composite hyperfiltration membrane preparation
Nano-TiO with 1.5 gram average diameter 10nm, long 160-180nm
2Fiber is dispersed in (both mass ratioes are 1.5: 100) in the deionized water, under 85 ℃, adds an amount of HNO
3Dispersant (H
+/ Ti
4+=0.05: 1), electromagnetic agitation was made nano-TiO about 4 hours
2Fibrous suspension adds binding agent methylcellulose and plasticizer polyvinyl alcohol and is made into coating liquid, nano-TiO
2Fiber content 1.1% (wt%), additive total amount 0.4% (wt%).Methylcellulose and polyvinyl alcohol mass ratio are 1: 4 in the additive.To make coating liquid is immersed on ceramic matrix transition zone (average pore size 160nm) surface immediately, at room temperature airing is after 20 hours, be warming up to 350 ℃ with 0.1 ℃ of/minute speed, constant temperature 2 hours continues to be warming up to 600 ℃ with 0.2 ℃ of/minute speed, roasting 3 hours, the back is cooling naturally, make separating layer membrane average thickness 7.0 μ m, the asymmetric porous ceramic ultra-filtering membrane of average pore size 65nm, average pure water permeability rate 6.9 * 10
-3L/m
2HPa.
Embodiment 3: asymmetric porous ceramic Al
2O
3-CeO
2The composite hyperfiltration membrane preparation
Nano Ce O with 2.5 gram average diameter 10nm, long 160-180nm
2Fiber is dispersed in (both mass ratioes are 2.5: 100) in the deionized water, under 85 ℃, adds an amount of HNO
3Dispersant (H
+/ Ce
4+=0.05: 1), electromagnetic agitation was made nano Ce O about 4 hours
2Fibrous suspension adds binding agent methylcellulose and plasticizer polyvinyl alcohol and is made into coating liquid, nano Ce O
2Fiber content 2.0% (wt%), additive total amount 0.6% (wt%).Methylcellulose and polyvinyl alcohol mass ratio are 1: 4 in the additive.To make coating liquid is immersed on ceramic matrix transition zone (average pore size 160nm) surface immediately, at room temperature airing is after 20 hours, be warming up to 350 ℃ with 0.1 ℃ of/minute speed, constant temperature 2 hours continues to be warming up to 550 ℃ with 0.1 ℃ of/minute speed, roasting 3 hours, the back is cooling naturally, make separating layer membrane average thickness 6.0 μ m, the asymmetric porous ceramic ultra-filtering membrane of average pore size 60nm, average pure water permeability rate 7.2 * 10
-3L/m
2HPa.
Claims (9)
1, a kind of asymmetric porous ceramic ultra-filtering membrane, the material of ceramic matrix is an Alpha-alumina, its profile is flat board or tubular type or multichannel, thickness 2-4mm, aperture 0.8-1.2 μ m; The material that it is characterized in that the asymmetric porous ceramic ultra-filtering membrane transition zone is the nano-metal-oxide fiber, number of plies 1-5 layer, gross thickness 10-80 μ m, every layer thickness 10-25 μ m, aperture, top layer 150-190nm; The material of separating layer is the nano-metal-oxide fiber, number of plies 1-2 layer, gross thickness 5-10 μ m, every layer thickness 3-7 μ m, top layer aperture 5-100nm.
2, asymmetric porous ceramic ultra-filtering membrane according to claim 1, the nano-metal-oxide fiber that it is characterized in that described transition zone are that the nano oxidized fibres of aluminium, titanium and cerium is a kind of, or theirs is compound.
3, asymmetric porous ceramic ultra-filtering membrane according to claim 1, the nano-metal-oxide fiber that it is characterized in that described separating layer are that the nano oxidized fibres of aluminium, titanium and cerium is a kind of, or theirs is compound.
4, the preparation method of the described asymmetric porous ceramic ultra-filtering membrane of claim 1 is characterized in that through following step: the nano-metal-oxide fiber dispersion in water, under 60-90 ℃, is added HCl or HNO
3Dispersant is made the nano-metal-oxide fibrous suspension, adds additive again: plasticizer and binding agent, be made into coating liquid, and be immersed on the ceramic matrix surface, drying, transition zone or separating layer perforated membrane are made in roasting, naturally cooling.
5, asymmetric porous ceramic ultra-filtering membrane preparation method according to claim 4, it is characterized in that described nano-metal-oxide fiber is: suspension and coating liquid that the nano-metal-oxide fiber of diameter 5-20nm, fineness ratio 1: 10-60 is prepared, be used to be immersed in the ceramic matrix surface, the preparation transition zone; Suspension and coating liquid that the nano-metal-oxide fiber of diameter 3-10nm, fineness ratio 1: 5-30 is prepared are used to be immersed in ceramic matrix transition zone surface, preparation asymmetric porous ceramic ultra-filtering membrane separating layer.
6, asymmetric porous ceramic ultra-filtering membrane preparation method according to claim 4, the binding agent that it is characterized in that described additive is methylcellulose or polyvinyl alcohol, plasticizer is polyvinyl alcohol or polyethylene glycol.
7, asymmetric porous ceramic ultra-filtering membrane preparation method according to claim 4, it is characterized in that the transition zone of described asymmetric porous ceramic ultra-filtering membrane or separating layer perforated membrane drying, roasting process are: after at room temperature airing 10-30 hour, be warming up to 300-400 ℃ with 0.1-5 ℃ of/minute speed, constant temperature 2-3 hour, continuation is warming up to 500-800 ℃ with 0.1-3 ℃ of/minute speed, roasting 1-4 hour, the back is cooling naturally.
8, asymmetric porous ceramic ultra-filtering membrane preparation method according to claim 4 is characterized in that the described ceramic matrix surface that is immersed in is that the coating liquid dipping of single nano-metal-oxide fibrous suspension is filmed or the suspension mixed coating liquid dipping of two or more nano-metal-oxide fiber is filmed.
9, asymmetric porous ceramic ultra-filtering membrane preparation method according to claim 4, it is characterized in that nano-metal-oxide fiber content 1.0-2.5% (wt%) in the described coating liquid, additive total content 0.2-1.0% (wt%), plasticizer and binding agent mass ratio 1: 3-5 in the additive.
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| CN101791524A (en) * | 2010-03-26 | 2010-08-04 | 南京工业大学 | Asymmetric structure ceramic ultrafiltration membrane and preparation method thereof |
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| CN102179184A (en) * | 2011-04-15 | 2011-09-14 | 淮阴师范学院 | Preparation method of ceramic microfiltration membrane by using attapulgite nano fibers as separating layer |
| CN102500245A (en) * | 2011-12-01 | 2012-06-20 | 西北有色金属研究院 | Preparation method of metal-base ceramic composite filter membrane |
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| CN101791524A (en) * | 2010-03-26 | 2010-08-04 | 南京工业大学 | Asymmetric structure ceramic ultrafiltration membrane and preparation method thereof |
| CN101791524B (en) * | 2010-03-26 | 2012-06-27 | 南京工业大学 | Asymmetric structure ceramic ultrafiltration membrane and preparation method thereof |
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| CN103521089B (en) * | 2013-10-18 | 2015-08-05 | 北京中天元环境工程有限责任公司 | Diffusion barrier |
| CN104707491A (en) * | 2013-12-17 | 2015-06-17 | 帕尔公司 | Skinless polyethersulfone membrane |
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