CN101992078B - Filter medium for removing estrogen medicine from water and preparation method thereof - Google Patents
Filter medium for removing estrogen medicine from water and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of a filter medium for removing estrogen medicine from water, comprising the following steps: (a) mixing raw materials of polyethylene with super-high molecular weight, active carbon, zeolite powder, concave-convex barstone powder, molecular sieve powder and foaming agent in the weight ratio of 240-360:50-100:40-80:40-80:50-100:100-150; and (b) pressing, sintering and cooling the prepared mixture in a mould. The invention also discloses a filter medium prepared by the method. The invention has the advantage that the technical scheme can remove a trace amount of estrogen medicine from water with the removal rate of 95% above.
Description
Technical field
The present invention relates to a kind of filter medium that is used for removing water estrogens medicine and preparation method thereof.
Background technology
Industry causes water resource to be seriously damaged with developing rapidly of agricultural; Industrial wastewater discharge is in rivers, lake; Agricultural chemicals, agrochemical be the discharging wantonly of use and house refuse and sanitary wastewater in a large number; The water quality variation that these all cause underground water and surface water causes producing in the water a lot of harmful materials.Water pollutes more and more becomes the severe problem that influences people's life.
U.S. scientist has analyzed the water sample from 139 rivers recently; Found that therein " opacifier in estrogen replacement medicine, brufen, pesticide spray, contraceptive, the sunblock lotion, mouthwash, antibacterial soap, cleaning agent " waits hundreds of drug ingedient; Wherein also have a large amount of antibiotic, the efficacy of a drug is lasting.Certainly the amount of these medicines is micro-; Exactly because and its content is few; Generally about 0.01mg/L, thus comparatively be difficult to remove, and can flow to through the sewage disposal device in city in the water source of drinking water in another city; Move in circles, the such water of human long-term drinking then can produce harmful effect.
Wherein one type of bigger material of influence is the estrogens medicine, influences the male sex's internal system easily.The estrogens medicine of removing trace in the water becomes a technical problem that needs to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of filter medium that is used for removing the micro-estrogens medicine of water, and this filter medium cost is low, and when being used for removing water estrogens medicine, clearance is high.
In order to solve above technical problem, the present invention adopts following technical scheme:
A kind of preparation method of filter medium that is used for removing water estrogens medicine comprises the steps:
The raw material that a) will comprise ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, molecular sieve powder and gas generation agent mixes, and the weight ratio of said ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, molecular sieve powder and gas generation agent is: 240～360: 50～100: 40～80: 40～80: 50～100: 100～150;
B) mixture of step a) gained is suppressed sintering, cooling in mould.
Preferably, the weight ratio of said ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, molecular sieve powder and gas generation agent is: 290～300: 60～70: 50～60: 50～60: 70～80: 110～120.The inventor finds, the weight ratio of said ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, molecular sieve powder and gas generation agent is in this scope the time, and the filter medium of preparation is significantly improved to the clearance of the estrogens medicine of trace.
Said ultra-high molecular weight polyethylene is a weight average molecular weight greater than 1,000,000 polyethylene, and preferably using weight average molecular weight is 250～4,000,000 polyethylene.Ultra-high molecular weight polyethylene can obtain from domestic production producer, and the product of M-I (molecular weight is 150 ± 500,000), M-II (molecular weight is 250 ± 500,000), M-III (molecular weight is 350 ± 500,000), M-IV specifications such as (molecular weight are greater than 4,000,000) can be provided like Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be.An effect of ultra-high molecular weight polyethylene is bonding and the effect that forms the filter medium skeleton; Utilize ultra-high molecular weight polyethylene to pass through compacting in addition; The filter medium that sintering obtains forms micropore easily, can play the effect of the estrogens medicine of trace in the adsorbed water.The particle diameter of ultra-high molecular weight polyethylene is 74～89 microns.
Active carbon is a kind of porous material, and it has like cellular pore structure, huge specific area, special surface functional group, stable physics and chemical property, is good adsorbent, catalyst or catalyst carrier.Can be divided into wood activated charcoal according to raw material sources different activities charcoal, like cocoanut active charcoal, apricot shell active carbon, wooden burgy etc.; The mineral raw material active carbon is the active carbon that raw material is processed like various coals and oil and elaboration products thereof; The active carbon that other raw material is processed, the active carbon of processing like scrap rubber, waste plastics etc.Be that the active carbon intensity in source is higher, absorption property is better wherein with the coconut husk material.The specific area of preferred active carbon is not less than 500 meters squared per gram, more preferably is not less than 1000 meters squared per gram.
Active carbon is impurity, the especially medical activated carbon in the adsorbed water efficiently, and as the product through the relevant drug surveilance standard of country, impurity content is lower, and surface area is bigger, and adsorption effect is also better.Select for use medical activated carbon can guarantee that filter medium directly is used for the processing of drinking water.In addition, the employing particle diameter is 74～250 microns a medical activated carbon, and effect can be better.
Natural zeolite is the general name of moisture porous silicate; Its crystalline texture mainly is to be made up of silicon-oxy tetrahedron; Wherein part tetravalence silicon ion is replaced by trivalent aluminium ion, causes negative electrical charge superfluous, so the ion of alkali metal (or alkaline-earth metal) isoequilibrium electric charge is arranged in the structure; The vestibule and the duct of certain pore size are arranged in the zeolite framework simultaneously, determined it to have character such as absorption, ion-exchange.
During modification, earlier natural zeolite powder is cleaned up with deionized water, dry, take by weighing the zeolite of certain mass, be immersed in the certain density modifier (solution), fully stirring is no less than 2 hours, and the filtration of neutralization back cleans up dry for standby with deionized water.
Modifier can be the HCl of 0.05～0.30mol/L, the H of 0.01～0.05mol/L
2SO
4, the NaCl of 0.2～1.0mol/L, the NaOH of 0.05～0.25mol/L, or the mixed solution of the NaCl of the HCl of 0.03～0.15mol/L and 0.2～1.0mol/L.When modifier was HCl and NaCl mixed solution, optium concentration NaCl was 0.8mol/L, and HCl is 0.09mol/L, adopted modifier should be no less than 2 hours usually to the time that zeolite carries out the modification processing, preferably was no less than 4 hours, and this moment, correctability was fully complete.
Zeolite can be removed impurity contained in the mineral and DDGS after modification is handled, in mineral structure, etch abundant hole and vestibule, increases its specific area, thus character such as the absorption of raising zeolite, ion-exchange.As preferably, the particle diameter of modified zeolite powder is 74～89 microns.
Attapulgite is a monoclinic system, and its desirable chemical formula does; Mg
5(H
2O)
4[Si
4O
10]
2(OH)
2, the chemical composition theoretical value is MgO 23.83%, SiO
256.96%, H
2O 19.21%.The attapulgite of occurring in nature often has Al
3+, Fe
3+Deng isomorphous replacement, rich Al
3+, Fe
3+Mutation be called aluminium attapulgite and iron attapulgite.Composition like the aluminium attapulgite powder of the Dragon King of Xuyi County, Jiangsu Province mountain products is SiO
258.38%, MgO 12.10%, Al
2O
39.50%, CaO 0.40%, TiO
20.56%, MnO 0.05%, Fe
2O
3+ FeO 5.26%, Na
2O1.10%, K
2O 1.24%.Because attapulgite has the major path of similar zeolite in structure, therefore have good adsorption and decoloration performance, and the estrogens medicine is had the good adsorption performance.SiO in the absorption property of attapulgite powder and the mineral
2Content relevant, the high more absorption affinity of content is strong more, the performance of the attapulgite powder after acid activation is handled is better.The attapulgite powder is preferably 74～89 microns attapulgite powder.
The acid activation method of attapulgite powder is more, and sulfuric acid process, salt acid system, sulfuric acid-mixed in hydrochloric acid method etc. are arranged.Like application number is the soak activating process that the patent of invention of CN90105849.1 discloses a kind of attapulgite powder, comprises the about 0.5～100cm of the volume of fritter
3The Concave-convex clay rod raw ore; Using concentration is the inorganic acid solution of 1～15wt%; Like sulfuric acid, hydrochloric acid solution etc., static immersion 2～100 hours is filtered extruding in flakes; 280～350 ℃ of following activation 30～50 minutes, the decolorizing ability that is ground into 50～100 microns was 250 ± 5 active attapulgite stone flour with revolving drier.
Molecular sieve is a kind of silicate compound with cubic lattice structure, mainly connects to form spacious skeleton structure by sial through oxo bridge, and uniform duct, a lot of apertures and marshalling, hole that internal surface area is very big are arranged in structure.Contain electricity price lower and the metal ion that ionic radius is bigger and the water of chemical combination attitude in addition.Because hydrone loses in receiving thermal process continuously; But crystal framework structure is constant, has formed the identical cavity of many sizes, and cavity is linked to each other by the identical micropore of many diameters again; These small void diameter sizes evenly; Can be than the inside of the little Molecular Adsorption of channel diameter, and outside than the big molecular repulsion in duct to the hole, thereby can come the different molecule of shape diameter, the different different molecular separation of molecule, degree of saturation of molecule, boiling point that polarity degree is different; Promptly has the effect of " screening " molecule, so be called molecular sieve.Molecular sieve has powerful absorption and crown_interception for estrogens medicine in the water.
Molecular sieve model commonly used has:
A type: potassium A (3A), sodium A (4A), calcium A (5A);
X type: calcium X (10X), sodium X (13X);
Y type: sodium Y, calcium Y.
The molecular sieve wettability power is extremely strong, should carry out Regeneration Treatment before the resting period, molecular sieve long and moisture absorption used.The method of Regeneration Treatment is a lot, discloses a kind of method of Regeneration Treatment among the Chinese patent ZL91111093, may further comprise the steps: (1) is 0.25～1.5 with ammonium sulfate and waste molecular sieve cracking catalyzer according to weight ratio: 1 mixes; (2) be heated to 250～600 ℃ of roastings and obtain soluble-salt; (3) product of roasting is used water logging, makes soluble-salt soluble in water; (4) filtration makes solution separate with the molecular sieve filter residue; (5) filter residue water or weak aqua ammonia washing is until washing no SO
4 2-(6) filter residue is dry down at 50～100 ℃.If molecular sieve is the molecular sieve that does not have moisture absorption, then can directly uses and need not carry out Regeneration Treatment.Employed molecular sieve powder is a nano X-type zeolite molecular sieve powder among the present invention, and the molecular sieve powder of this type has the effect of estrogens medicine in the better removal water with respect to the zeolite molecular sieve powder of other types.The preferred nano molecular sieve that uses among the present invention.
Gas generation agent is selected at least a in Celogen Az, food-grade carbonic hydroammonium, the oxalic acid.As preferably, gas generation agent is Celogen Az or food-grade carbonic hydroammonium.Wherein, food-grade carbonic hydroammonium is also claimed AMMONIUM BICARBONATE FOOD GRADE, distinguishes mutually with technical grade carbonic hydroammonium.Though technical grade carbonic hydroammonium also has the effect of sending out the hole, it may contain the impurity of insalubrity, should not be as the raw materials for production of drinking water filter medium.Gas generation agent is one type and is prone to the decomposition a large amount of gases of generation and causes a material of sending out the hole effect that wherein azo compound, sodium acid carbonate, carbonic hydroammonium, ammonium carbonate, sulphonyl nitrile compounds, oxalic acid etc. are its typical representatives.Wherein, preferably use food-grade carbonic hydroammonium.
Pressing pressure can be chosen as 0.4～1.0MPa, and sintering temperature is: 230～240 ℃, sintering time is 120～150 minutes, and being cooled to 40～60 ℃ promptly can the demoulding.
Though the present invention has carried out comparatively detailed description for several kinds of used in the step a) among above-mentioned preparation method raw materials, the present invention is not limited to this kind theory or other any theory.Still be not sure of for the concrete chemical change between them, the variation of structure in the preparation process.The filter medium that these several kinds of raw materials are prepared through above-mentioned PROCESS FOR TREATMENT can effectively be removed the estrogens medicine of the trace in the water, and synergy is arranged, and can the estrogens medicine of the trace in the water fully be absorbed.
In the present invention; For blend step; Can think that any low shear mixer or agitator that can significantly not change diameter of particle and size distribution all is suitable for; Such as the agitator with blunt impeller blade, drum-type blender, spiral agitator etc., rotating speed will be looked the type of blender and decide, but is advisable with the dust of avoiding kicking up.
Mixed powder is filled in the pre-designed mould, and with its compacting, pressure generally is not more than 1MPa through pressurization, and adapts with the material of mould therefor; Mould can be by aluminium, cast iron, steel or any suitable made that can bear relevant pressure and temperature.Can be in the mould inner surface release agent application, that can select silicone oil or any other for use can be adsorbed onto the commercially available releasing agent on the filter medium hardly, also can use processing release papers such as aluminium foil.
The present invention also provides following technical scheme: a kind of filter core that uses above-mentioned filter medium.
The present invention also provides following technical scheme: a kind of purifier comprises above-mentioned filter medium or filter core.
The present invention also provides a kind of water dispenser that comprises above-mentioned purifier.
With respect to prior art, the invention has the advantages that the technical scheme that is proposed can remove the estrogens medicine of the trace in the water, clearance reaches more than 95%; Thereby reach the purpose of improving water quality; And method is simple, and the raw material sources of preparation filter medium are extensive, and cost is low.
Technical scheme provided by the present invention is specially adapted to by the processing of the drinking-water of the estrogens medicine of trace pollution.
The specific embodiment
For further understanding the present invention, above-mentioned technical scheme is done further elaboration and explanation below in conjunction with embodiment.
Embodiment 1
The concrete steps of present embodiment may further comprise the steps:
(1) take by weighing ultra-high molecular weight polyethylene powder 240g (gram), said ultra-high molecular weight polyethylene is the M-III type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 3,500,000, and particle diameter is 74～89 microns;
(2) take by weighing medicinal active powdered carbon 100g, the particle diameter of said medical activated carbon is 74～89 microns;
(3) take by weighing modified zeolite powder 40g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～89 microns cleans up with deionized water; Oven dry; Be immersed among 0.05 the HCl 6 hours, clean up with the alkali neutralization and with deionized water then, oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 80g, said modified attapulgite stone flour is handled through following method and is obtained:
With the attapulgite powder, use the hydrochloric acid solution of concentration as 5wt% (mass fraction), static immersion 48 hours is filtered extruding in flakes, 300 ℃ of following activation 40 minutes, is ground into 74～89 microns modified attapulgite stone flours with revolving drier.
(5) take by weighing sodium X type molecular sieve 50g, the particle diameter of said sodium X type molecular sieve is 74～89 microns.
(6) take by weighing food-grade carbonic hydroammonium 70g, purity reaches more than 99.99%;
(7) above-mentioned six kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(8) being packed into diameter is in the 50mm tubular die, in the hydraulic pressure pressed of 0.4MPa, 230 ℃ of sintering temperatures 150 minutes;
(9) naturally cool to 50 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
Embodiment 2
The concrete steps of present embodiment may further comprise the steps:
(1) take by weighing ultra-high molecular weight polyethylene powder 360g, said ultra-high molecular weight polyethylene is the M-III type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 3,500,000, and particle diameter is 74～89 microns;
(2) take by weighing medicinal active powdered carbon 50g, the particle diameter of said medical activated carbon is 74～250 microns;
(3) take by weighing modified zeolite powder 80g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～89 microns cleans up with deionized water; Oven dry; Be immersed among 0.05 the HCl 8 hours, clean up with the alkali neutralization and with deionized water then, oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 40g, said modified attapulgite stone flour is handled through following method and is obtained:
With the attapulgite powder, use the hydrochloric acid solution of concentration as 5wt% (mass fraction), static immersion 72 hours is filtered extruding in flakes, 300 ℃ of following activation 50 minutes, is ground into 74～89 microns modified attapulgite stone flours with revolving drier.
(5) take by weighing sodium X type molecular sieve 100g, the particle diameter of said sodium X type molecular sieve is 74～89 microns.
(6) take by weighing Celogen Az 150g, purity reaches more than 99.99%;
(7) above-mentioned six kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(8) being packed into diameter is in the 50mm tubular die, in the hydraulic pressure pressed of 0.6MPa, 240 ℃ of sintering temperatures 120 minutes;
(9) naturally cool to 40 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
Embodiment 3
The concrete steps of present embodiment may further comprise the steps:
(1) take by weighing ultra-high molecular weight polyethylene powder 290g, said ultra-high molecular weight polyethylene is the M-III type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 3,500,000, and particle diameter is 74～89 microns;
(2) take by weighing medicinal active powdered carbon 70g, the particle diameter of said medical activated carbon is 74～89 microns;
(3) take by weighing modified zeolite powder 50g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～89 microns cleans up with deionized water; Oven dry; Be immersed among 0.05 the HCl 8 hours, clean up with the alkali neutralization and with deionized water then, oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 60g, said modified attapulgite stone flour is handled through following method and is obtained:
With the attapulgite powder, use the hydrochloric acid solution of concentration as 5wt% (mass fraction), static immersion 72 hours is filtered extruding in flakes, 300 ℃ of following activation 50 minutes, is ground into 74～89 microns modified attapulgite stone flours with revolving drier.
(5) take by weighing sodium X type molecular sieve 50g, the particle diameter of said sodium X type molecular sieve is 74～89 microns.
(6) take by weighing food-grade carbonic hydroammonium 120g, purity reaches more than 99.99%;
(7) above-mentioned six kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(8) being packed into diameter is in the 50mm tubular die, in the hydraulic pressure pressed of 0.6MPa, 240 ℃ of sintering temperatures 120 minutes;
(9) naturally cool to 40 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
Embodiment 4
The concrete steps of present embodiment may further comprise the steps:
(1) take by weighing ultra-high molecular weight polyethylene powder 310g, said ultra-high molecular weight polyethylene is the M-III type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 3,500,000, and particle diameter is 74～89 microns;
(2) take by weighing medicinal active powdered carbon 60g, the particle diameter of said medical activated carbon is 74～89 microns;
(3) take by weighing modified zeolite powder 60g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～89 microns cleans up with deionized water; Oven dry; Be immersed among 0.05 the HCl 8 hours, clean up with the alkali neutralization and with deionized water then, oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 50g, said modified attapulgite stone flour is handled through following method and is obtained:
With the attapulgite powder, use the hydrochloric acid solution of concentration as 5wt% (mass fraction), static immersion 72 hours is filtered extruding in flakes, 300 ℃ of following activation 50 minutes, is ground into 74～89 microns modified attapulgite stone flours with revolving drier.
(5) take by weighing sodium X type molecular sieve 80g, the particle diameter of said sodium X type molecular sieve is 74～89 microns.
(6) take by weighing food-grade carbonic hydroammonium 110g, purity reaches more than 99.99%;
(7) above-mentioned six kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(8) being packed into diameter is in the 50mm tubular die, in the hydraulic pressure pressed of 0.6MPa, 240 ℃ of sintering temperatures 120 minutes;
(9) naturally cool to 40 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
The table of comparisons raw materials used among the embodiment 1～4 is as shown in table 1.
Table 1
Embodiment 5
Get the tubulose filter core 1,2,3,4 of the many minute apertures of embodiment 1～4 gained; The liner two-layer nonwoven, the outsourcing two-layer nonwoven wraps polypropylene porous net at skin again; Bonding the going up in filter core two ends connects end cap, is positioned in stainless steel or the plastic casing, is used for Drinking Water; Through detecting, this filter core is good, as shown in table 2 to the removal effect of the estrogens medicine of the trace in the drinking water.The needs that are fit to very much the home terminal drinking water treatment.
Table 2 uses filter core to handle the water unit of front and back: mg/L (mg/litre)
Can find out that from table 3 the estrogens medicine that utilizes filter core of the present invention to remove the trace in the water has been obtained good effect.
In addition the water before and after handling has also been carried out the test of sundry item, test result is as shown in table 3.
Table 3 uses filter core to handle the water of front and back
Can find out from table 3, utilize filter core of the present invention in the estrogens medicine of removing trace, muddy thing and bacterial micro-organism also had a good effect of removing.
With respect to prior art, the invention has the advantages that the technical scheme that is proposed can remove the estrogens medicine of the trace in the water, clearance reaches more than 95%; Thereby reach the purpose of improving water quality; And method is simple, and the raw material sources of preparation filter medium are extensive, and cost is low.
In addition, in removing water, in the estrogens medicine of trace, also can remove muddy thing and bacterial micro-organism in the water, especially also higher to the clearance of bacterial micro-organism.
Technical scheme provided by the present invention is specially adapted to by the processing of the drinking-water of the estrogens medicine of trace pollution.
More than carried out detailed introduction to filter medium provided by the present invention and preparation method thereof and by the filter core that this filter medium is processed.Used specific embodiment in this specification principle of the present invention and embodiment have been set forth, for one of ordinary skill in the art, according to the thought of the present invention part that on the specific embodiment and range of application, possibly in implementation process, can change.Therefore, the content of this specification record should not be construed as limitation of the present invention.
Claims (8)
1. a preparation method of filter medium that is used for removing water estrogens medicine comprises the steps:
The raw material that a) will comprise ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, nano X-type zeolite molecular sieve powder and gas generation agent mixes, and the weight ratio of said ultra-high molecular weight polyethylene, active carbon, zeolite powder, attapulgite powder, nano X-type zeolite molecular sieve powder and gas generation agent is: 290～300: 60～70: 50～60: 50～60: 70～80: 110～120;
B) mixture of step a) gained is suppressed in mould, sintering, cooling, the pressure of said compacting is 0.4～1.0MPa, and the temperature of sintering is 230～240 ℃, and the time of sintering is 120～150 minutes, and being cooled to 40～60 ℃ promptly can the demoulding.
2. preparation method according to claim 1 is characterized in that, the weight average molecular weight of said ultra-high molecular weight polyethylene is 2,500,000～4,000,000.
3. preparation method according to claim 1 is characterized in that, said active carbon is a medical activated carbon, and its particle diameter is 74～250 microns.
4. preparation method according to claim 1 is characterized in that, the particle diameter of said zeolite powder is 74～89 microns.
5. preparation method according to claim 1 is characterized in that, the particle diameter of said attapulgite powder is 74～89 microns.
6. preparation method according to claim 5 is characterized in that, said attapulgite powder is the attapulgite powder through acid activation.
7. preparation method according to claim 1 is characterized in that, said gas generation agent is a food-grade carbonic hydroammonium.
8. the filter medium that obtains according to each described preparation method in the claim 1～7.
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| CN102430285B (en) * | 2011-09-19 | 2014-04-02 | 奇迪电器集团有限公司 | Filtration medium for removing oxirane in water, preparation method of the filtration medium, filter core prepared from the filtration medium and water purification device comprising the filtration medium or the filter core |
| CN103977774A (en) * | 2014-05-28 | 2014-08-13 | 潘峰 | Filtering medium for removing nonyl phenol in drinking water, filter element and preparation method |
| CN104549136A (en) * | 2015-01-29 | 2015-04-29 | 江苏中翔网络科技有限公司 | Filter medium for air purification, filter core, mouth-nose mask and preparation method of filter medium |
| CN104737967B (en) * | 2015-02-13 | 2017-07-21 | 沈阳大学 | The improvement SAT systems of oestrone in a kind of processing fishpond water |
| CN106395964A (en) * | 2016-08-31 | 2017-02-15 | 北京太和洁源科技发展有限公司 | Novel antibiotic and hormone treatment process of surface water |
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| CN101259104A (en) * | 2008-04-29 | 2008-09-10 | 中国科学院山西煤炭化学研究所 | Functionalization mesoporous molecular sieve used in adsorption and sustained-release alkaline drug method |
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