CN101992061B - Filter medium for removing perfluorooctane sulfonate from water and preparation method thereof - Google Patents
Filter medium for removing perfluorooctane sulfonate from water and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a filter medium for removing perfluorooctane sulfonate from water and a preparation method thereof. The preparation method comprises the following steps of: a. mixing raw materials comprising ultrahigh molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and a foaming agent, wherein the weight ratio of the ultrahigh molecular weight polyethylene to the active carbon to the sepiolite powder to the attapulgite powder to the zeolite powder to the foaming agent is 200-400:100-200:100-200:100-200:50-150:10-150; and b. pressing, sintering and cooling the mixture obtained in the step a in a die. The invention also discloses a filter medium prepared by using the preparation method. Compared with the prior art, the invention has the advantages that perfluorooctane sulfonate in water can be removed by using the disclosed technical scheme, and the removal rate is higher than 95%, therefore, the purpose of improving water quality is achieved; in addition, the preparation method is simple, and the raw materials used for preparing the filter medium have wide sources and low cost.
Description
Technical field
The present invention relates to a kind of filter medium that is used for removing the water perfluorooctane sulfonate 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.'s current research was found in 2009; In a lot of household goods; For example in cosmetics, the pest repellants such as curtain, carpet, packaging for foodstuff, shampoo, contain a kind of chemical substance of perfluorooctane sulfonate, can cause the women to be difficult to pregnancy; The content of perfluorooctane sulfonate exceeds 16 times of normal contents in some women's blood, and infertile probability exceeds 134% than other people.This is the research that the whole world links together both first.
The English name of perfluorooctane sulfonate is perfluorooctane sulphonate, is called for short PFOS, the fluorinated surfactant.
From calendar year 2001 one, find perfluorooctane sulfonate widely in the water environment, because perfluorooctane sulfonate is used for chemical products such as cotton products, industrial lubricants, paint, cosmetics, agricultural chemical insecticide, pharmaceuticals and fire foam, application surface is very extensive.Hundreds of perfluorooctane sulfonate products comprise that in the environment neutralization the final metabolite in the human organism still is a perfluorooctane sulfonate.Because of its special perfluor chemistry design feature, be difficult to degraded, the half-life in human body is about the time in 4 years half, accumulates in vivo easily, has because of its fat metabolism and mitochondria energy metabolism impairment, disturbs antioxidant system etc.Perfluorooctane sulfonate is a kind of environmental hormone, persistence environmental contaminants, extensively has the pollution problem of perfluorooctane sulfonate in China's water environment.
At present, also there is not a kind of method that can efficiently remove the perfluorooctane sulfonate in the drinking-water.
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 water perfluorooctane sulfonate, and this filter medium cost is low, and when being used for removing the water perfluorooctane sulfonate, 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 the water perfluorooctane sulfonate comprises the steps:
The raw material that a) will comprise ultra-high molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent mixes, and the weight ratio of said ultra-high molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent is 200～400: 100～200: 100～200: 100～200: 50～150: 10～150;
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, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent is: 290～300: 140～150: 150～160: 120～140: 110～120: 110～120.The inventor finds, the weight ratio of said ultra-high molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent is in this scope the time, and the filter medium of preparation is significantly improved to the clearance of perfluorooctane sulfonate.
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, utilizes ultra-high molecular weight polyethylene to pass through compacting in addition, and the filter medium that sintering obtains forms micropore easily, can play the effect of perfluorooctane sulfonate 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.
Sepiolite can be divided into two types of hot-liquid type sepiolite and appositional pattern sepiolites according to the reason that forms, and is commonly referred to α-type sepiolite and β-type sepiolite.The hot-liquid type sepiolite ore deposit is formed by the hydrothermal solution direct crystallization or is formed through the low temperature hot liquid alteration by volcanic glass, the mineral that contain magnesium, often originates in the dolomitic limestone that is rich in magnesium, the white clouds matter Dali rock; Normal and the carbonate rock of appositional pattern sepiolite deposit, clay rock symbiosis are generated by diagenesis.Hot-liquid type sepiolite is the fibre bundle shape, MgO (magnesia) and SiO
2(silica) content is high, Al
2O
3(aluminium oxide) content is low, is rich magnesium sepiolite; The appositional pattern sepiolite is argillaceous, but observation still is fibrous under electron microscope, modified meerschaum Al
2O
3Content is high, Mg and SiO
2Content is low, is rich meerschalminite.Sepiolite has big specific area and pore volume, and passage and the space of running through total are arranged, and there are three types of activated centres in the sepiolite surface: the oxygen atom in (1) silicon-oxy tetrahedron layer, thus oxygen atom provides weak electric charge to carry out the absorption to adsorbate; (2) hydrone of position and magnesium ion coordination on the edge of, they can form hydrogen bond with adsorbate; (3) at tetrahedral outer surface; Si-O-Si bond fission and the Si-OH ion cluster that produces; Come the electric charge of compensate for residual through a proton or a polyhydroxylated molecule, these ion clusters distribute along the spacing of fiber axis with 5 dusts, and its quantity depends on the size of fiber and the scarce cave of crystal.These Si-OH ion clusters can with the interaction of molecules that is attracted on the sepiolite outer surface, can also form covalent bond with some organic reagents.These activated centres make that the absorption property of sepiolite is fabulous, comprise the organic compound that adsorbs nonpolar or low pole.Preferred use particle diameter is 18～150 microns a sepiolite powder.The sepiolite powder specific area that particle diameter is little is big, brings into play suction-operated more easily.Better through the sepiolite powder effect of activation processing, can make acid activation, for example working concentration be 0.1～20% sulfuric acid 20～100 ℃ of immersion treatment 1～15h of temperature (hour).
Sepiolite can be divided into two types of hot-liquid type sepiolite and appositional pattern sepiolites according to the reason that forms, and is commonly referred to α-type sepiolite and β-type sepiolite.The hot-liquid type sepiolite ore deposit is formed by the hydrothermal solution direct crystallization or is formed through the low temperature hot liquid alteration by volcanic glass, the mineral that contain magnesium, often originates in the dolomitic limestone that is rich in magnesium, the white clouds matter Dali rock; Normal and the carbonate rock of appositional pattern sepiolite deposit, clay rock symbiosis are generated by diagenesis.Hot-liquid type sepiolite is the fibre bundle shape, MgO (magnesia) and SiO
2(silica) content is high, Al
2O
3(aluminium oxide) content is low, is rich magnesium sepiolite; The appositional pattern sepiolite is argillaceous, but observation still is fibrous under electron microscope, modified meerschaum Al
2O
3Content is high, Mg and SiO
2Content is low, is rich meerschalminite.Sepiolite has big specific area and pore volume, and passage and the space of running through total are arranged, and there are three types of activated centres in the sepiolite surface: the oxygen atom in (1) silicon-oxy tetrahedron layer, thus oxygen atom provides weak electric charge to carry out the absorption to adsorbate; (2) hydrone of position and magnesium ion coordination on the edge of, they can form hydrogen bond with adsorbate; (3) at tetrahedral outer surface; Si-O-Si bond fission and the Si-OH ion cluster that produces; Come the electric charge of compensate for residual through a proton or a polyhydroxylated molecule, these ion clusters distribute along the spacing of fiber axis with 5 dusts, and its quantity depends on the size of fiber and the scarce cave of crystal.These Si-OH ion clusters can with the interaction of molecules that is attracted on the sepiolite outer surface, can also form covalent bond with some organic reagents.These activated centres make that the absorption property of sepiolite is fabulous, comprise the organic compound that adsorbs nonpolar or low pole.Preferred use particle diameter is 18～150 microns a sepiolite powder.The sepiolite powder specific area that particle diameter is little is big, brings into play suction-operated more easily.Better through the sepiolite powder effect of activation processing, can make acid activation, for example working concentration be 0.1～20% sulfuric acid 20～100 ℃ of immersion treatment 1～15h of temperature (hour).
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 radioactive substance 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.
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 74～250 microns.
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 perfluorooctane sulfonate in the water, and synergy is arranged, and can the perfluorooctane sulfonate 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 perfluorooctane sulfonate 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 perfluorooctane sulfonate 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 200g (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 200g, the particle diameter of said medical activated carbon is 74～250 microns;
(3) take by weighing sepiolite powder 100g, said sepiolite powder is handled through following method and obtained: the sepiolite powder 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 200g, 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 74～250 microns modified attapulgite stone flours with revolving drier;
(5) take by weighing modified zeolite powder 50g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～250 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;
(6) take by weighing food-grade carbonic hydroammonium 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 0.4MPa, 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 400g, 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 sepiolite powder 200g, said sepiolite powder is handled through following method and obtained: the sepiolite powder 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 100g, 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 modified zeolite powder 150g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～250 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;
(6) take by weighing Celogen Az 10g, 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 140g, the particle diameter of said medical activated carbon is 74～89 microns;
(3) take by weighing sepiolite powder 160g, said sepiolite powder is handled through following method and is obtained:
Sepiolite powder with 74～89 microns cleans up with deionized water, and oven dry is immersed among 0.05 the HCl 6 hours, cleans up with the alkali neutralization and with deionized water then, and oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 120g, 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 modified zeolite powder 110g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～250 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;
(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.
Embodiment 4
The concrete steps of present embodiment may further comprise the steps:
(1) take by weighing ultra-high molecular weight polyethylene powder 300g, 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 150g, the particle diameter of said medical activated carbon is 74～89 microns;
(3) take by weighing sepiolite powder 150g, said sepiolite powder is handled through following method and is obtained:
Sepiolite powder with 74～89 microns cleans up with deionized water, and oven dry is immersed among 0.05 the HCl 6 hours, cleans up with the alkali neutralization and with deionized water then, and oven dry promptly gets;
(4) take by weighing modified attapulgite stone flour 140g, 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 modified zeolite powder 120g, said modified zeolite powder is handled through following method and obtained: the natural zeolite with 74～250 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;
(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.
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 perfluorooctane sulfonate 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 perfluorooctane sulfonate that utilizes filter core of the present invention to remove 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 when removing perfluorooctane sulfonate, muddy thing and bacterial micro-organism are also had good effect of removing.
With respect to prior art, the invention has the advantages that the technical scheme that is proposed can remove the perfluorooctane sulfonate 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 perfluorooctane sulfonate, 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 perfluorooctane sulfonate 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 the water perfluorooctane sulfonate comprises the steps:
The raw material that a) will comprise ultra-high molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent mixes; The particle diameter of said ultra-high molecular weight polyethylene is 74～89 microns, and the weight ratio of said ultra-high molecular weight polyethylene, active carbon, sepiolite powder, attapulgite powder, zeolite powder and gas generation agent is 290～300: 140～150: 150～160: 120～140: 110～120: 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 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, said sepiolite powder is the sepiolite powder through acid activation.
5. preparation method according to claim 1 is characterized in that, said attapulgite powder is the attapulgite powder through acid activation.
6. preparation method according to claim 1 is characterized in that, the particle diameter of said zeolite powder is 74～250 microns.
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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101659477A CN101992061B (en) | 2009-08-18 | 2009-08-18 | Filter medium for removing perfluorooctane sulfonate from water and preparation method thereof |
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| CN2009101659477A CN101992061B (en) | 2009-08-18 | 2009-08-18 | Filter medium for removing perfluorooctane sulfonate from water and preparation method thereof |
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| CN102276012B (en) * | 2011-07-27 | 2012-10-31 | 北京师范大学 | Method for purifying perfluorooctane sulfonate in water by photocatalysis in simulated sunlight |
| CN103159272A (en) * | 2013-04-03 | 2013-06-19 | 河海大学 | Activated-carbon composite water treatment agent as well as preparation method and application thereof |
| EP3646946A1 (en) | 2018-10-30 | 2020-05-06 | Helmholtz-Zentrum für Umweltforschung GmbH-UFZ | Method for the removal of polyfluorinated organic compounds from water by means of an adsorbent and regeneration thereof |
| CN113044910A (en) * | 2021-03-11 | 2021-06-29 | 中国科学院南京土壤研究所 | Method for removing perfluoro or polyfluoro compounds in water body by using attapulgite |
| JP7538928B1 (en) | 2023-09-14 | 2024-08-22 | 宇部マテリアルズ株式会社 | PFAS adsorbent and method for producing the same |
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| CN101234272A (en) * | 2008-03-04 | 2008-08-06 | 周奇迪 | Filtration medium and preparation, filter element, purifier and drinking machine using the same |
| CN101310854A (en) * | 2008-02-22 | 2008-11-26 | 周奇迪 | Filter media and preparation method, filter element, purifier and drinking machine using the filter media |
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| CN101310854A (en) * | 2008-02-22 | 2008-11-26 | 周奇迪 | Filter media and preparation method, filter element, purifier and drinking machine using the filter media |
| CN101234272A (en) * | 2008-03-04 | 2008-08-06 | 周奇迪 | Filtration medium and preparation, filter element, purifier and drinking machine using the same |
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