CN1872681A - Diplopore silica gel material, and preparation method - Google Patents
Diplopore silica gel material, and preparation method Download PDFInfo
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- CN1872681A CN1872681A CN 200510073092 CN200510073092A CN1872681A CN 1872681 A CN1872681 A CN 1872681A CN 200510073092 CN200510073092 CN 200510073092 CN 200510073092 A CN200510073092 A CN 200510073092A CN 1872681 A CN1872681 A CN 1872681A
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Abstract
This invention discloses a method for preparing porous silica gel column material. The macropore sizes are 0.5-3.0 mum, and the mesopore sizes are 3-10nm. The volume of the pores is 2.5-3.5 cu cm/g, and the specific surface area is 250-710 sq cm/g. The compressive strength of the particles is 180-220 N.
Description
Technical field
The invention relates to a kind of inorganic porous material and preparation method thereof, more specifically say so about a kind of through-flow type diplopore silica gel material and preparation method thereof with high rigidity.
Background technology
In field of porous materials, hole diameter enlargement is one of structure control target, aperture ordered big hole material of (hundreds of nanometer) in optical wavelength range has unique optical property and other character, might play a significant role in information industry as photonic bandgap material.The actual industrial catalyzer can not be a powdered material, requirement is the particle with certain size (millimeter or inferior micron), mesoporous and macropore in these particles helps the diffusion of reactant and product, and the material in multi-level hole (from micropore to mesoporous to macropore) will have higher efficient.
At Anal.Chem.1996,68 (9): reported in 3498. that Minakuchi etc. has at first prepared by sol-gel method and has micron order macropore and the mesoporous monolithic silica column of nano level simultaneously, it directly or carry out can be used as after the chemically modified stationary phase of high performance liquid chromatography, because the existence of the macropore that connects makes monolithic silica column have very strong permeability mutually, the variation of post pressure drop with flow rate is slow; Mesoporous then for integral post provides big specific surface area, be the precondition that guarantees Gao Zhuxiao.This makes it demonstrate very big advantage in biomacromolecule such as proteinic separation.Yet the monolithic silica column physical strength of preparing by this method is not enough, causes its application to be very limited.
In order to make this through-flow type diplopore silica gel material can be applied to fields such as catalysis, absorption, the physical strength that improves it is the matter of utmost importance that needs solution, secondly also will keep the pore passage structure of its perforation.
Summary of the invention
One of purpose of the present invention is to provide a kind of through-flow type diplopore silica gel material of high rigidity, is beneficial to it and uses widely, and two of purpose is to provide this silicagel column preparation methods.
Diplopore silica gel material provided by the invention, its macropore diameter are 0.5～3.0 μ m, and mesoporous aperture is 3～10nm, and pore volume is 2.5～3.5cm
3/ g, specific surface area is 250～710m
2/ g, this material highly for 1cm, when diameter is 0.7cm right cylinder particle shape, crush strength is 180～220N.
The present invention also provides the preparation method of above-mentioned diplopore silica gel material, it is characterized in that this method comprises following process: with polyoxyethylene glycol, water, acid, silicon source is 1 in molar ratio: (5800～60000): (1～11): mix (300～4000), stir down at 0 ℃, form vitreosol, behind gel, with silica obtained post washing in the alcoholic solution of water successively, aging in the alcoholic solution in silicon source, in surface tension less than the liquid of water or can reduce in the capillary solution and soak, again through super-dry and roasting.
In the method provided by the invention, the molecular weight of said polyoxyethylene glycol is preferably 10000～100000.
In the method provided by the invention, behind the formation vitreosol, gel generally is that vitreosol is sealed in Glass tubing or in the polyfluortetraethylene pipe, places water-bath, descends 1～48 hour at 30～60 ℃, preferably obtains in 2～24 hours down at 40～50 ℃.
In the method provided by the invention, in order to strengthen the permeability of macropore, the alcoholic solution that the silicagel column that forms behind the gel is put into water washs, and water is generally 0.05～0.35, preferred 0.15～0.3 with the volume ratio of alcohol; Wash temperature is 40～70 ℃, preferred 55～70 ℃.
In the method provided by the invention, place the alcoholic solution in silicon source aging silicagel column, in fact be exactly in network of silica, to add new monomer, thereby increase the crosslinking degree of network, play the effect that improves silicagel column intensity and hardness.In the alcoholic solution in silicon source, the silicon source is generally 0.5～0.8, preferred 0.5～0.7 with the volume ratio of alcohol; Wear out and descended 10～96 hours at 50～80 ℃ usually, preferably descended 24～96 hours at 55～70 ℃.
In the method provided by the invention, in order to reduce the destruction of capillary force to silicagel column, silicagel column is put into surface tension after aging again less than the liquid of water or can reduce capillary solution and soak, usually soaked 12～36 hours down at 40～60 ℃, preferably soaked 20～30 hours down at 45～55 ℃.Wherein said surface tension can be selected from methyl alcohol, ethanol, propyl alcohol, acetone or normal heptane less than the liquid of water; The described aqueous solution that can reduce preferred tween 80 of capillary solution or class of department.
In the method provided by the invention, said exsiccant purpose is in order to remove solvent such as the water in the silicagel column, under air, nitrogen all can, usually 40～120 ℃ down dry 10 hours to a week, preferably under 60～80 ℃, carried out 1～3 day.
In the method provided by the invention, there has been enough intensity can maintain its pore structure after the silicagel column drying, still,, and done like this and can also further improve intensity for practical application must be carried out roasting removing organism.Roasting can be carried out in air or nitrogen, and maturing temperature is at 500～1000 ℃, preferably 700～800 ℃ of following roastings.
The diplopore silica gel material of the present invention's preparation has excellent mechanical intensity, and the improvement of physical strength will promote its research and application in bulky molecular catalysis, absorption and fields such as separating.
Description of drawings
Fig. 1 is the stereoscan photograph of embodiment 1 gained sample;
Fig. 2 is the x-ray diffraction pattern of embodiment 1 gained sample;
Fig. 3 is the stereoscan photograph of embodiment 2 gained samples;
Fig. 4 is the stereoscan photograph of embodiment 3 gained samples.
Embodiment
The invention will be further described below by embodiment, but content not thereby limiting the invention.
Among the embodiment, the volume and the pore size distribution of macropore are measured by mercury penetration method, and the pore passage structure of perforation is by scanning electron microscopic observation, and specific surface area and mesoporous pore size distribution pass through determination of nitrogen adsorption; The crystal phase structure of material determines that by X-ray diffraction its particle crush strength is measured by the ZQJ strength test trier that Dalian diagnositc equipment factory produces.
Embodiment 1
(molecular weight is 10 with the 4.97g polyoxyethylene glycol, 000) joins in the nitric acid of 52mL 0.01mol/L, be stirred to dissolving fully, add 28.4mL tetramethoxy-silicane (TMOS) again, 0 ℃ of following vigorous stirring after 30 minutes, pouring gained colloidal sol into diameter is to seal in the polyfluortetraethylene pipe about 1.0cm, places 40 ℃ water-bath gel 2 hours.
Secondly, take out the silicagel column in the polyfluortetraethylene pipe, behind deionized water rinsing, placing volume ratio is the methanol solution of 20% (water/methyl alcohol), keeps 24 hours down at 55 ℃.Then placing volume ratio is the methanol solution of the TMOS of 65% (TMOS/ methyl alcohol), wears out 60 hours down at 65 ℃.Soaked 24 hours down at 50 ℃ with methyl alcohol then.At last 70 ℃ dry 24 hours down, 700 ℃ of following roastings 2 hours promptly get the silicagel column sample.
Fig. 1 is the stereoscan photograph of gained sample, and Fig. 2 is the x-ray diffraction pattern of gained sample, and as seen from the figure, silicon-dioxide is unbodied.
The macropore diameter of gained sample is 3.0 μ m, and mesoporous aperture is 6nm, and pore volume is 3.3cm
3/ g, specific surface area is 256m
2/ g, when sample was cut into the right cylinder particle of height 1cm, diameter 0.7cm, its crush strength was 200N.
Embodiment 2
(molecular weight is 100 with the 4.97g polyoxyethylene glycol, 000) joins in the acetate of 52mL 0.01mol/L, be stirred to dissolving fully, add 28.4mL tetramethoxy-silicane (TMOS) again, 0 ℃ of following vigorous stirring after 30 minutes, pouring gained colloidal sol into diameter is to seal in the polyfluortetraethylene pipe about 1.0cm, places 40 ℃ water-bath gel 3 hours.
Secondly, take out the silicagel column in the polyfluortetraethylene pipe, behind deionized water rinsing, placing volume ratio is the ethanolic soln of 18% (water/ethanol), keeps 24 hours down at 62.5 ℃.Then placing volume ratio is the ethanolic soln of the TMOS of 59% (TMOS/ ethanol), wears out 96 hours down at 65 ℃.Soaked 24 hours down at 50 ℃ with ethanol then.At last 60 ℃ dry 48 hours down, 700 ℃ of following roastings 2 hours promptly get silicagel column.
Fig. 3 is the stereoscan photograph of gained sample, and the macropore diameter of sample is 1.5 μ m, and mesoporous aperture is 4nm, and pore volume is 2.5cm
3/ g, specific surface are 429m
2/ g, when sample was cut into the right cylinder particle of height 1cm, diameter 0.7cm, its particle crush strength was 220N.
Embodiment 3
(molecular weight is 10 with the 4.37g polyoxyethylene glycol, 000) joins in the nitric acid of 52mL 0.044mol/L, be stirred to dissolving fully, add 28.4mL tetramethoxy-silicane (TMOS) again, 0 ℃ of following vigorous stirring after 30 minutes, pouring gained colloidal sol into diameter is to seal in the polyfluortetraethylene pipe about 1.0cm, places 40 ℃ water-bath gel 2 hours.
Secondly, take out the silicagel column in the polyfluortetraethylene pipe, behind deionized water rinsing, placing volume ratio is the methanol solution of 26% (water/methyl alcohol), keeps 24 hours down at 70 ℃.Then placing volume ratio is the methanol solution of the TMOS of 50% (TMOS/ methyl alcohol), wears out 24 hours down at 57.5 ℃.The aqueous solution with tween 80 soaked 24 hours down at 50 ℃ then.At last 70 ℃ dry 24 hours down, 700 ℃ of following roastings 2 hours promptly get silicagel column.
Fig. 4 is the stereoscan photograph of gained sample, and the macropore diameter of sample is 1.8 μ m, and mesoporous aperture is 3nm, and pore volume is 3.4cm
3/ g, specific surface are 709m
2/ g, when sample was cut into the right cylinder particle of height 1cm, diameter 0.7cm, its particle crush strength was 190N.
Embodiment 4
(molecular weight is 10 with the 4.23g polyoxyethylene glycol, 000) joins in the acetate of 52mL 0.01mol/L, be stirred to dissolving fully, add 28.4mL tetraethoxysilane (TEOS) again, 0 ℃ of following vigorous stirring after 30 minutes, pouring gained colloidal sol into diameter is to seal in the polyfluortetraethylene pipe about 1.0cm, places 40 ℃ water-bath gel 24 hours.
Secondly, take out the silicagel column in the polyfluortetraethylene pipe, behind deionized water rinsing, placing volume ratio is the ethanolic soln of 20% (water/ethanol), keeps 24 hours down at 60 ℃.Then placing volume ratio is the ethanolic soln of the TEOS of 70% (TEOS/ ethanol), wears out 72 hours down at 70 ℃.Soaked 24 hours down at 50 ℃ with normal heptane then.At last 80 ℃ dry 72 hours down, 700 ℃ of following roastings 2 hours promptly get the silicagel column material.
The macropore diameter of gained sample is 0.5 μ m, and mesoporous aperture is 10nm, and pore volume is 2.7cm
3/ g, specific surface are 350m
2/ g, when sample was cut into the right cylinder particle of height 1cm, diameter 0.7cm, its particle crush strength was 210N.
Claims (8)
1. a diplopore silica gel material is characterised in that its macropore diameter is 0.5～3.0 μ m, and mesoporous aperture is 3～10nm, and pore volume is 2.5～3.5cm
3/ g, specific surface area is 250～710m
2/ g, this material highly for 1cm, when diameter is 0.7cm right cylinder particle shape, crush strength is 180～220N.
2. method for preparing the diplopore silica gel of claim 1, it is characterized in that this method comprises following process: with polyoxyethylene glycol, water, acid, silicon source is 1 in molar ratio: (5800～60000): (1～11): mix (300～4000), stir down at 0 ℃, form vitreosol, behind gel, with silica obtained post washing in the alcoholic solution of water successively, aging in the alcoholic solution in silicon source, in surface tension less than the liquid of water or can reduce in the capillary solution and soak, again through super-dry and roasting.
3. according to the method for claim 2, wherein said polyoxyethylene glycol is that molecular weight is 10000～100000.
4. according to the method for claim 2, wherein said acid is selected from acetate, hydrochloric acid, sulfuric acid or nitric acid.
5. according to the method for claim 2, wherein said silicon source is selected from tetramethoxy-silicane, tetraethoxysilane, tetrapropoxysilane or four butoxy silanes.
6. according to the method for claim 2, wherein said alcohol is methyl alcohol or ethanol.
7. according to the process of claim 1 wherein that the liquid of described surface tension less than water is selected from methyl alcohol, ethanol, propyl alcohol, acetone or normal heptane.
8. describedly can reduce the aqueous solution that capillary solution is tween 80 or department class according to the process of claim 1 wherein.
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Cited By (3)
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|---|---|---|---|---|
| CN103739288A (en) * | 2013-12-19 | 2014-04-23 | 华东理工大学 | Silicon carbide block with macroporous and mesoporous composite structure, and preparation method thereof |
| CN105837748A (en) * | 2016-03-30 | 2016-08-10 | 江苏大学 | Hierarchical ordered macroporous-mesoporous monolithic silica column bovine serum albumin imprinted polymer and preparation method thereof |
| CN115254074A (en) * | 2022-09-26 | 2022-11-01 | 晋江精纯科技有限公司 | Preparation method of monodisperse pore passage controllable through-flow type chromatographic microspheres |
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| CN1120801C (en) * | 2000-07-17 | 2003-09-10 | 中国科学院山西煤炭化学研究所 | Dual-pore molecular sieve and its preparing process |
| US6911192B2 (en) * | 2001-06-29 | 2005-06-28 | Japan Science And Technology Agency | Method for preparing inorganic porous material |
| CN1155823C (en) * | 2002-09-26 | 2004-06-30 | 武汉大学 | Capillary electrochromatography or liquid chromatography immobile phase, preparing method and use thereof |
| CN1260003C (en) * | 2003-05-11 | 2006-06-21 | 杨更亮 | Silica gel continuous bar and preparation process thereof |
| CN1213799C (en) * | 2003-05-19 | 2005-08-10 | 武汉大学 | Sequential porous silica gel whole column and its preparation and use |
| CN1291913C (en) * | 2004-09-01 | 2006-12-27 | 复旦大学 | Macroporous sillca molecular sieve with ordered three-dimensional interconnected aperture wall and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739288A (en) * | 2013-12-19 | 2014-04-23 | 华东理工大学 | Silicon carbide block with macroporous and mesoporous composite structure, and preparation method thereof |
| CN103739288B (en) * | 2013-12-19 | 2015-07-01 | 华东理工大学 | Silicon carbide block with macroporous and mesoporous composite structure, and preparation method thereof |
| CN105837748A (en) * | 2016-03-30 | 2016-08-10 | 江苏大学 | Hierarchical ordered macroporous-mesoporous monolithic silica column bovine serum albumin imprinted polymer and preparation method thereof |
| CN105837748B (en) * | 2016-03-30 | 2018-01-16 | 江苏大学 | A kind of stratum's ordered big hole mesoporous silica gel integral post bovine serum albumin(BSA) imprinted polymer and preparation method thereof |
| CN115254074A (en) * | 2022-09-26 | 2022-11-01 | 晋江精纯科技有限公司 | Preparation method of monodisperse pore passage controllable through-flow type chromatographic microspheres |
| CN115254074B (en) * | 2022-09-26 | 2023-02-03 | 晋江精纯科技有限公司 | Preparation method of monodisperse pore controllable through-flow type chromatographic microsphere |
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