CN114604963B - Functional biological carrier, preparation method and application thereof - Google Patents
Functional biological carrier, preparation method and application thereof Download PDFInfo
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- CN114604963B CN114604963B CN202210277556.XA CN202210277556A CN114604963B CN 114604963 B CN114604963 B CN 114604963B CN 202210277556 A CN202210277556 A CN 202210277556A CN 114604963 B CN114604963 B CN 114604963B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/106—Carbonaceous materials
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/108—Immobilising gels, polymers or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a functional biological carrier, a preparation method and application thereof. The functional biological carrier comprises: a polyethylene biological carrier; a load layer compounded on the surface of the polyethylene biological carrier; the composition of the support layer includes polyglycidyl methacrylate and a carbon material. According to the invention, the polyglycidyl methacrylate is grafted onto the surface of the polyethylene biological carrier through an irradiation method, and then the polyglycidyl methacrylate grafted onto the surface of the polyethylene biological carrier is combined with a carbon material through a chemical combination method to prepare the functional biological carrier. Compared with the traditional polyethylene biological carrier, the carrier has higher specific surface area and surface potential, has good biological affinity and conductivity, and enhances the electron transfer effect among microorganism species while promoting the adhesion growth of a biological film. The carrier can be used as a suspension filler of a moving bed biomembrane reactor, and improves the biological treatment efficiency and the system stability of wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a functional biological carrier, a preparation method and application thereof.
Background
The activated sludge method is the most common biological wastewater treatment process, but the activated sludge exists in the form of flocs, so that the sludge flocs are easy to run off along with effluent in practical application, and a large amount of microorganisms are lost. Biological carriers such as filler or filter materials are filled in novel reactors such as moving bed membrane bioreactors (MBBR) and deep bed filters, microorganisms can be enriched on the surfaces of the novel reactors, the microorganisms are prevented from losing along with water outlet, and further the biological treatment effect is enhanced.
The common MBBR filler is made of high polymer materials and has the advantages of large specific surface area, long service life and the like. Although the biological film attached to the MBBR filler can enhance the biological treatment efficiency and reduce the microbial loss, most of the surfaces of the high polymer materials lack reactive groups, the biocompatibility is poor, and the biological film attached to the filler is easy to fall off due to collision or water flow impact. In addition, researches show that the inter-species electron transfer phenomenon exists among part of microorganisms, and the performances of anaerobic methane production and denitrification can be improved by adding materials with conductive functions such as biochar and the like into a reactor. However, the existing MBBR filler has no remarkable interaction between microorganisms attached to the filler due to the insulation property of the polymer material used by the filler itself, and has no promotion effect on the inter-species electron transfer between microorganisms. Therefore, there is room for further improvement in the biological wastewater treatment efficiency.
In recent years, the preparation of a conductive functional carrier by combining conductive functional materials such as biochar and MBBR filler in the modes of heating, melting, bonding, extrusion blending and the like is studied to achieve the purposes of promoting biological adhesion and enhancing electron transfer among microorganism species. However, these preparation methods still have some disadvantages, on one hand, due to the physical action between the material and the filler, the conductive material is easy to fall off in long-term operation of the partially conductive functional carrier; on the other hand, the extrusion blending mode consumes more conductive functional materials, and the economic cost is high. Thus, there is currently a lack of a stable running and economically friendly electrically conductive functional carrier.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide a functional biological carrier, a preparation method and application thereof, wherein the functional biological carrier provided by the invention can be used as a suspension filler of a moving bed biological membrane reactor, so that the biological treatment efficiency of wastewater is improved.
The present invention provides a functional biological carrier comprising:
a polyethylene biological carrier;
and a load layer compounded on the surface of the polyethylene biological carrier;
the components of the supporting layer comprise polyglycidyl methacrylate and a carbon material.
Preferably, the carbon material includes at least one of biochar and graphite.
Preferably, the biochar is prepared according to the following method:
a) Soaking wood chips in hydrochloric acid solution, washing with distilled water, drying and pulverizing;
b) And pyrolyzing the crushed wood chips in a nitrogen atmosphere to obtain the biochar.
The invention also provides a preparation method of the functional biological carrier, which comprises the following steps:
a) Uniformly mixing a dichloromethane solution containing glycidyl methacrylate with a polyethylene biological carrier, removing oxygen in the system and sealing;
b) Placing the sealed system in a radiation field for irradiation;
c) Mixing the irradiated polyethylene biological carrier with a dichloromethane solution containing a carbon material, reacting, and curing to obtain the functional biological carrier.
Preferably, the mass ratio of the glycidyl methacrylate to the polyethylene biological carrier is 2-3: 0.5 to 1.5;
the mass concentration of the methylene dichloride solution containing the glycidyl methacrylate is 20-25%;
oxygen in the system was removed by introducing nitrogen into the system.
Preferably, the radiation field is 7.4X10 14 Bq 60 A Co gamma-ray radiation source;
the irradiation dose rate is 10-50 Gy/min, and the absorption dose is 10-500 KGy;
after the irradiation, the method further comprises: washed with dichloromethane.
Preferably, the mass ratio of the carbon material to the polyethylene biological carrier in the step A) is 0.04-4: 2 to 5.
Preferably, in step C), the reaction temperature is room temperature and the reaction time is 0.5 to 4 hours.
Preferably, the curing temperature is 60-70 ℃;
the curing mode is water bath curing, and the curing is carried out in a sealed environment.
The invention also provides application of the functional biological carrier in wastewater treatment;
the functional biological carrier is the functional biological carrier described above or the functional biological carrier prepared by the preparation method described above.
The present invention provides a functional biological carrier comprising: a polyethylene biological carrier; and a load layer compounded on the surface of the polyethylene biological carrier; the components of the supporting layer comprise polyglycidyl methacrylate and a carbon material. According to the invention, the polyglycidyl methacrylate is grafted onto the surface of the polyethylene biological carrier through an irradiation method, and then the polyglycidyl methacrylate grafted onto the surface of the polyethylene biological carrier is combined with a carbon material through a chemical combination method, so that the functional biological carrier is prepared. Compared with the traditional polyethylene biological carrier, the functional biological carrier has higher specific surface area and surface potential, has good biological affinity and conductivity, and can enhance the electron transfer effect among microorganism species while promoting the adhesion growth of a biological film. The carrier can be used as a suspension filler of a Moving Bed Biofilm Reactor (MBBR), so that the biological treatment efficiency and the system stability of the wastewater are improved, and the economic cost is reduced.
Drawings
Fig. 1 is a schematic structural view of a functional biological carrier according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention provides a functional biological carrier comprising:
a polyethylene biological carrier;
and a load layer compounded on the surface of the polyethylene biological carrier;
the components of the supporting layer comprise polyglycidyl methacrylate and a carbon material.
Fig. 1 is a schematic structural view of a functional biological carrier according to an embodiment of the present invention. Wherein 1 is a polyethylene biological carrier, 2 is polyglycidyl methacrylate and 3 is a carbon material.
The functional biological carrier provided by the invention comprises a polyethylene biological carrier 1. In certain embodiments of the invention, the polyethylene biovector is MBBR filler, with a gauge of K1, K2, or K3. In certain embodiments, the polyethylene biovector gauge is K1. The type and the source of the polyethylene biological carrier are not particularly limited, and the polyethylene biological carrier can be commonly sold in the market, and particularly can be produced by Henan Norbang environmental protection technology Co.
The functional biological carrier provided by the invention further comprises a load layer compounded on the surface of the polyethylene biological carrier. The components of the supporting layer comprise polyglycidyl methacrylate 2 and a carbon material 3.
In certain embodiments of the invention, the thickness of the loading layer is 0.05 to 0.5mm. In certain embodiments, the thickness of the loading layer is 0.05 to 0.3mm.
In certain embodiments of the invention, the carbon material comprises at least one of biochar and graphite. In certain embodiments, the carbon material comprises biochar and graphite in a mass ratio of 0.5 to 1:0.5 to 1. In certain embodiments, the mass ratio of biochar to graphite is 1:1. in certain embodiments of the invention, the graphite has a particle size of 200 to 500 mesh, preferably 325 mesh.
In certain embodiments of the invention, the biochar is prepared according to the following method:
a) Soaking wood chips in hydrochloric acid solution, washing with distilled water, drying and pulverizing;
b) And pyrolyzing the crushed wood chips in a nitrogen atmosphere to obtain the biochar.
In step a):
in certain embodiments of the invention, the hydrochloric acid solution has a mass concentration of 10% to 15%, preferably 10%.
In certain embodiments of the invention, the wood chips have a particle size of 1 to 10mm.
In certain embodiments of the invention, the soaking time is 0.5 to 2 hours. In certain embodiments, the soaking time is 0.5h.
In certain embodiments of the invention, the drying temperature is 60-80 ℃, preferably 60 ℃.
In certain embodiments of the invention, the crushed wood chips have a particle size of 40 to 200 mesh. The comminution is carried out in a universal comminution mill.
In step b):
in certain embodiments of the invention, the pyrolysis is at a temperature of 400 to 600 ℃; the pyrolysis time is 2 to 4 hours, preferably 3 hours. In certain embodiments, the temperature of the pyrolysis is 400 ℃, 500 ℃ or 600 ℃, preferably 400 ℃.
The pyrolysis is carried out in an alumina crucible of a tube furnace.
The invention also provides a preparation method of the functional biological carrier, which comprises the following steps:
a) Uniformly mixing a dichloromethane solution containing glycidyl methacrylate with a polyethylene biological carrier, removing oxygen in the system and sealing;
b) Placing the sealed system in a radiation field for irradiation;
c) Mixing the irradiated polyethylene biological carrier with a dichloromethane solution containing a carbon material, reacting, and curing to obtain the functional biological carrier.
In the preparation method of the functional biological carrier, the adopted raw material components are the same as the above, and are not described in detail herein.
The invention firstly mixes methylene dichloride solution containing Glycidyl Methacrylate (GMA) with polyethylene biological carrier uniformly, removes oxygen in the system and seals.
In certain embodiments of the invention, the mass ratio of the glycidyl methacrylate to the polyethylene biovector is 2-3: 0.5 to 1.5, preferably 2.5:1.
in certain embodiments of the invention, the concentration of the glycidyl methacrylate-containing methylene chloride solution is 20% to 25% by mass, preferably 25%.
In certain embodiments of the invention, the mixing is performed in an irradiation bottle.
In certain embodiments of the invention, the oxygen in the system is removed by bubbling nitrogen through the system. Specifically, the method comprises the following steps: and introducing nitrogen into the irradiation bottle to remove oxygen in the irradiation bottle. The nitrogen may be introduced for a period of 5 to 10 minutes, and in some embodiments, for a period of 5 minutes.
After removing oxygen from the irradiation bottle, sealing was performed.
The sealed system is then placed in a radiation field for irradiation. Specifically, the sealed irradiation bottle is placed in a radiation field for irradiation.
In certain embodiments of the present invention, the radiation field employs 7.4X10 14 Bq 60 A Co gamma-ray radiation source;
the irradiation dose rate is 10-50 Gy/min, and the absorption dose is 10-500 KGy.
In certain embodiments of the invention, the dose rate of irradiation is 20Gy/min and the absorbed dose is 30KGy.
Through irradiation, glycidyl methacrylate is grafted onto a polyethylene biological carrier, and meanwhile, the glycidyl methacrylate is reacted to obtain the polyglycidyl methacrylate.
In certain embodiments of the present invention, after the irradiating, further comprising: washed with dichloromethane. To remove unreacted monomer and homopolymer.
And after the cleaning is finished, mixing the cleaned polyethylene biological carrier with a dichloromethane solution containing a carbon material, reacting, and solidifying to obtain the functional biological carrier.
In certain embodiments of the invention, the mass ratio of the carbon material to the polyethylene biovector in step a) is between 0.04 and 4:2 to 5, preferably 0.4:3.
in certain embodiments of the invention, the concentration of the methylene chloride solution containing the carbon material is 1 to 100g/L. In certain embodiments, the concentration of the methylene chloride solution containing the carbon material is 10g/L.
In certain embodiments of the invention, the mixing is uniform.
In certain embodiments of the invention, the reaction is at room temperature for a period of 0.5 to 4 hours. In certain embodiments, the reaction time is 2h.
In certain embodiments of the invention, the curing temperature is 60 to 70 ℃. In certain embodiments, the temperature of the curing is 65 ℃.
In certain embodiments of the invention, the curing is performed in a water bath, and the curing is performed in a sealed environment.
In certain embodiments of the present invention, the above-mentioned methylene chloride has a purity of 99.5%.
The invention also provides an application of the functional biological carrier in wastewater treatment;
the functional biological carrier is the functional biological carrier described above or the functional biological carrier prepared by the preparation method described above.
Specifically, the invention provides application of the functional biological carrier as suspended filler for wastewater treatment, such as: the application of the functional biological carrier as the suspension filler of the moving bed biomembrane reactor.
The source of the raw materials used in the present invention is not particularly limited, and may be generally commercially available.
The beneficial effects are that:
the functional biological carrier provided by the invention has the advantages that all substances are combined under chemical action, the combination is firm, the functional carbon material is not easy to fall off, and the functional biological carrier can be used for a long time.
The functional biological carrier provided by the invention is only combined with a layer of functional carbon material on the surface, so that the adding cost of the conductive functional material is reduced, and the functional biological carrier is economical and friendly.
The functional biological carrier provided by the invention can enhance the electron transfer among the seeds of microorganisms while providing microorganism adhesion, and further improve the biological treatment efficiency of wastewater.
In order to further illustrate the present invention, the following examples are provided to describe in detail a functional biological carrier, a preparation method and an application thereof, but are not to be construed as limiting the scope of the present invention.
The raw materials used in the following examples are all commercially available.
Example 1
Preparation of biochar:
1) Soaking wood chips with the particle size of 1-10 mm in hydrochloric acid solution with the mass concentration of 10% for 0.5h, washing with distilled water, drying at 60 ℃, crushing the dried wood chips by a universal crusher, wherein the particle size of the crushed wood chips is 40-200 meshes;
2) Placing the crushed wood chips into an alumina crucible, placing the alumina crucible into a tube furnace, and pyrolyzing the wood chips at 400 ℃ for 3 hours under nitrogen atmosphere to obtain the biochar.
Preparation of functional biological carrier:
1) Uniformly mixing a polyethylene biological carrier with the specification of K1 and a methylene dichloride solution containing glycidyl methacrylate with the mass concentration of 25% in an irradiation bottle, introducing nitrogen into the irradiation bottle for 5min to remove oxygen in the irradiation bottle, and sealing;
the mass ratio of the glycidyl methacrylate to the polyethylene biological carrier is 2.5:1, a step of;
2) Placing the sealed irradiation bottle in a radiation field for irradiation;
the radiation field is 7.4X10 14 Bq 60 A Co gamma-ray radiation source; the irradiation dose rate is 20Gy/min, and the absorption dose is 30KGy;
after the irradiation is finished, taking out the polyethylene biological carrier, and cleaning with dichloromethane to remove unreacted monomers and homopolymers;
3) After the cleaning is finished, uniformly mixing the cleaned polyethylene biological carrier with a dichloromethane solution containing a carbon material, wherein the concentration of the dichloromethane solution is 10g/L, reacting for 2 hours at room temperature, sealing the system, and solidifying in a water bath at 65 ℃ to obtain a functional biological carrier;
the carbon material is the biochar prepared above;
the mass ratio of the carbon material to the polyethylene biological carrier in the step 1) is 0.4:3.
the resulting functional biological vector comprises:
a polyethylene biological carrier;
and a load layer compounded on the surface of the polyethylene biological carrier; the thickness of the load layer is 0.05-0.3 mm;
the components of the supporting layer comprise polyglycidyl methacrylate and a carbon material.
The obtained functional biological carrier is added into a heterotrophic denitrification moving bed biological film reactor, the volume of the functional biological carrier accounts for 40% of the volume of the moving bed biological film reactor, COD of the reactor inlet water is 300mg/L, nitrate is 50mg/L, the hydraulic retention time in the reactor is 8 hours, and the nitrate removal rate of the reactor is measured, wherein the result is shown in table 1.
Example 2
The procedure of example 1 was followed except that the pyrolysis temperature in example 1 was changed to 500℃and the remaining steps were performed as in example 1 to obtain a functional biological carrier. The nitrate removal rate of the reactor was measured according to the test method of example 1, and the results are shown in table 1.
Example 3
The procedure of example 1 was followed except that the pyrolysis temperature in example 1 was changed to 600℃and the remaining steps were performed as in example 1 to obtain a functional biological carrier. The nitrate removal rate of the reactor was measured according to the test method of example 1, and the results are shown in table 1.
Example 4
The procedure of example 1 was followed except that the carbon material of example 1 was changed to graphite, and the remaining steps were performed as in example 1 to obtain a functional biological carrier. The nitrate removal rate of the reactor was measured according to the test method of example 1, and the results are shown in table 1.
Example 5
The carbon material in the embodiment 1 is changed into biochar and graphite, and the mass ratio of the biochar to the graphite is 1:1, the remaining steps were carried out as in example 1 to obtain a functional biological carrier. The nitrate removal rate of the reactor was measured according to the test method of example 1, and the results are shown in table 1.
Comparative example 1
Preparation of functional biological carrier:
1) Uniformly mixing a polyethylene biological carrier with the specification of K1 and a methylene dichloride solution containing glycidyl methacrylate with the mass concentration of 25% in an irradiation bottle, introducing nitrogen into the irradiation bottle for 5min to remove oxygen in the irradiation bottle, and sealing;
the mass ratio of the glycidyl methacrylate to the polyethylene biological carrier is 2.5:1, a step of;
2) Placing the sealed irradiation bottle in a radiation field for irradiation;
the radiation field is 7.4X10 14 Bq 60 A Co gamma-ray radiation source; the irradiation dose rate is 20Gy/min, and the absorption dose is 30KGy;
after the irradiation is finished, taking out the polyethylene biological carrier, and cleaning with dichloromethane to remove unreacted monomers and homopolymers;
3) Sealing the cleaned polyethylene biological carrier after cleaning, and solidifying in water bath at 65 ℃ to obtain a functional biological carrier;
the obtained functional biological carrier is added into a heterotrophic denitrification moving bed biological film reactor, the volume of the functional biological carrier accounts for 40% of the volume of the moving bed biological film reactor, COD of the reactor inlet water is 300mg/L, nitrate is 50mg/L, the hydraulic retention time in the reactor is 8 hours, and the nitrate removal rate of the reactor is measured, wherein the result is shown in table 1.
Table 1 nitrate removal rates of the reactors of examples 1 to 5 and comparative example 1
As can be seen from table 1, the functional biovectors of examples 1 to 5 significantly improved the nitrate removal rate in the moving bed biofilm reactor compared to comparative example 1, wherein the nitrate removal rates in examples 1 and 5 exceeded 95%.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A functional biological carrier comprising:
a polyethylene biological carrier;
and a load layer compounded on the surface of the polyethylene biological carrier;
the components of the supporting layer comprise polyglycidyl methacrylate and a carbon material;
the polyethylene biological carrier is MBBR filler;
the carbon material is at least one of biochar and graphite;
the biochar is prepared according to the following method:
a) Soaking wood chips in hydrochloric acid solution, washing with distilled water, drying and pulverizing;
b) Pyrolyzing the crushed wood dust in a nitrogen atmosphere to obtain biochar;
the functional biological carrier is prepared by the following preparation method:
a) Uniformly mixing a dichloromethane solution containing glycidyl methacrylate with a polyethylene biological carrier, removing oxygen in the system and sealing;
b) Placing the sealed system in a radiation field for irradiation;
c) Mixing the irradiated polyethylene biological carrier with a dichloromethane solution containing a carbon material, reacting, and curing to obtain a functional biological carrier;
the reaction temperature is room temperature and the reaction time is 0.5-4 hours;
the curing mode is water bath curing, and the curing is performed in a sealed environment;
the curing temperature is 60-70 ℃.
2. A method of preparing the functional biological carrier of claim 1, comprising the steps of:
a) Uniformly mixing a dichloromethane solution containing glycidyl methacrylate with a polyethylene biological carrier, removing oxygen in the system and sealing;
b) Placing the sealed system in a radiation field for irradiation;
c) Mixing the irradiated polyethylene biological carrier with a dichloromethane solution containing a carbon material, reacting, and curing to obtain a functional biological carrier; the reaction temperature is room temperature and the reaction time is 0.5-4 hours;
the curing mode is water bath curing, and the curing is performed in a sealed environment;
the curing temperature is 60-70 ℃.
3. The preparation method of claim 2, wherein the mass ratio of the glycidyl methacrylate to the polyethylene biological carrier is 2-3: 0.5 to 1.5;
the mass concentration of the methylene dichloride solution containing the glycidyl methacrylate is 20% -25%;
oxygen in the system was removed by introducing nitrogen into the system.
4. The method of claim 2, wherein the radiation field is 7.4x10 14 Bq 60 A Co gamma-ray radiation source;
the irradiation dose rate is 10-50 Gy/min, and the absorption dose is 10-500 KGy;
after the irradiation, the method further comprises: washed with dichloromethane.
5. The preparation method of claim 2, wherein the mass ratio of the carbon material to the polyethylene bio-carrier in the step a) is 0.04-4: 2-5.
6. An application of a functional biological carrier in wastewater treatment;
the functional biological carrier is the functional biological carrier according to claim 1 or the functional biological carrier prepared by the preparation method according to any one of claims 2-5.
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| JP6834526B2 (en) * | 2017-01-24 | 2021-02-24 | 東ソー株式会社 | Carrier and wastewater treatment method using it |
| CN106867607A (en) * | 2017-03-28 | 2017-06-20 | 常州大学 | A kind of preparation method of modified composite biological packing |
| JP2017189774A (en) * | 2017-06-29 | 2017-10-19 | 住友金属鉱山株式会社 | Anion exchange resin and method of recovering platinum group elements |
| CN107262064A (en) * | 2017-07-26 | 2017-10-20 | 浙江大学 | A kind of preparation method of daiamid grafted graphene oxide cladded type biological micromolecule adsorbent |
| EP3604638B1 (en) * | 2018-07-30 | 2020-07-08 | Polytex Sportbeläge Produktions-GmbH | Artificial turf fiber with a core-cladding structure comprising an aged polymer |
| CN112897705B (en) * | 2021-01-13 | 2022-06-17 | 北京大学 | Preparation method and application of multilayer graphene oxide modified microbial carrier |
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| JP2014148738A (en) * | 2013-02-01 | 2014-08-21 | Kankyo Joka Kenkyusho:Kk | Method of separating and recovering rare earth elements and acid from solution containing rare earth elements |
| CN104587981A (en) * | 2015-01-15 | 2015-05-06 | 东华大学 | Nanofiber membrane with heavy metal adsorbing function and preparation method of nanofiber membrane |
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