CN110917895A - Direct drinking water treatment membrane containing graphene microchip and preparation method thereof - Google Patents
Direct drinking water treatment membrane containing graphene microchip and preparation method thereof Download PDFInfo
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- CN110917895A CN110917895A CN201911393568.3A CN201911393568A CN110917895A CN 110917895 A CN110917895 A CN 110917895A CN 201911393568 A CN201911393568 A CN 201911393568A CN 110917895 A CN110917895 A CN 110917895A
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- 239000012528 membrane Substances 0.000 title claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 45
- 239000003651 drinking water Substances 0.000 title claims abstract description 27
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title description 3
- 239000004952 Polyamide Substances 0.000 claims abstract description 87
- 229920002647 polyamide Polymers 0.000 claims abstract description 87
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 26
- 230000002209 hydrophobic effect Effects 0.000 claims description 32
- 239000011148 porous material Substances 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- -1 graphite alkene Chemical class 0.000 claims description 12
- 239000002064 nanoplatelet Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000005909 Kieselgur Substances 0.000 claims description 4
- 210000002615 epidermis Anatomy 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 132
- 239000002344 surface layer Substances 0.000 abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000004907 flux Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract description 3
- 239000000017 hydrogel Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0093—Chemical modification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/105—Support pretreatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/12—Adsorbents being present on the surface of the membranes or in the pores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/38—Hydrophobic membranes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon And Carbon Compounds (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of water treatment, in particular to a direct drinking water treatment membrane containing graphene micro-sheets, which comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer; according to the invention, the diatomite particles are added in the polyamide support body layer, so that the specific surface area of the polyamide support body layer is improved, the physical and chemical stability, acid resistance and adsorbability of the direct drinking water treatment membrane are further improved, the porosity is high, the integral quality of the direct drinking water treatment membrane is improved, the structural design of the hydrophilic layer is adopted, the hydrophilicity of the water treatment membrane is further improved, the membrane flux is improved, the hydrophobicity is improved, the structural design of the graphene micro-sheet layer is adopted, and the integral performance of the water treatment membrane is improved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a direct drinking water treatment membrane containing graphene nanoplatelets.
Background
As a pressure-driven membrane technology, ultrafiltration and reverse osmosis are widely applied to deep purification of drinking water, and membranes used in water treatment can be divided into solid membranes and liquid membranes according to structural parts, wherein the solid membranes are membranes prepared by taking solid substances as separation media, and the liquid membranes are membranes formed by taking liquid substances as separation media. The solid films are further classified into symmetrical films and asymmetrical films, and they are different in whether or not the respective portions of the films have the same characteristics. The liquid membrane may be present in two forms, one being in the form of a liquid membrane present in a solid porous support layer and the other being in the form of an emulsion. The aromatic polyamide reverse osmosis membrane has excellent physical and chemical stability, strong alkali resistance, grease resistance organic solvent resistance, high temperature resistance and aging resistance, but is easy to be polluted in the using process, has low cleaning efficiency and needs to improve the water flux.
Disclosure of Invention
The purpose of the invention is: overcomes the defects in the prior art, and provides a direct drinking water treatment membrane containing graphene nanoplatelets, which is not easy to be polluted, long in service life and high in water flux in the using process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a straight drink water treatment membrane that contains graphite alkene microchip, straight drink water treatment membrane includes polyamide supporter layer and top layer, polyamide supporter in situ has added a plurality of diatomaceous earth particles, the top layer includes upper epidermis and lower top layer, the upper epidermis is hydrophilic layer, hydrophilic layer is polyethylene glycol base aquogel coating, the top layer is the hydrophobic layer down, the hydrophobic layer is porous crystalline polypropylene coating, be provided with graphite alkene microchip layer between polyamide supporter layer and the hydrophobic layer.
Further, the graphene micro-sheet layer is connected with the polyamide support layer through a polyamide adhesive.
Further, the diatomaceous earth particles have an average experienced size of 26-28 μm.
Further, the addition amount of the diatomite particles of the polyamide support layer is 4-5%.
Further, the thickness of the graphene micro-sheet layer is 50-200 μm.
Further, the thickness of the polyamide support layer is 600-800 μm, the pore size of the polyamide support layer is 120-480 μm, and the pore area is 45-50% of the membrane area.
Furthermore, modified isomeric alcohol polyoxyethylene ether is added into the polyamide support layer for modification in the film forming process.
Further, the thickness of the hydrophilic layer is 100-200 μm.
Further, the thickness of the hydrophobic layer is 80-120 μm.
The technical scheme adopted by the invention has the beneficial effects that:
according to the invention, the diatomite particles are added in the polyamide support body layer, so that the specific surface area of the polyamide support body layer is improved, the physical and chemical stability, acid resistance and adsorbability of the direct drinking water treatment membrane are further improved, the porosity is high, the integral quality of the direct drinking water treatment membrane is improved, the structural design of the hydrophilic layer is adopted, the hydrophilicity of the water treatment membrane is further improved, the membrane flux is improved, the hydrophobicity is improved, the structural design of the graphene micro-sheet layer is adopted, and the integral performance of the water treatment membrane is improved.
Detailed Description
The following examples are intended to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to limit the scope of the present invention. Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
A direct drinking water treatment membrane containing graphene nanoplatelets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, and the graphene nanoplatelets are arranged between the polyamide support body layer and the hydrophobic layer. The overall performance of the water treatment membrane is improved.
As a preferred embodiment, the graphene micro-sheets and the polyamide support layer in this embodiment are connected by a polyamide adhesive, and with this structure, the connection strength between the graphene micro-sheets and the polyamide support layer is higher.
As a preferable embodiment, the average passing size of the diatomite particles in this embodiment is 26 to 28 μm, preferably 28 μm, and the main component of the diatomite is amorphous silica, which has high chemical stability, acid resistance and strong adsorption capacity, large specific surface area and many small pore structures, and the porosity is 80 to 90%.
As a preferred embodiment, the amount of the diatomite particles added to the polyamide support layer in this embodiment is 4-5%, preferably 4.5%, and other such as 4.1%, 4.2%, 4.3%, 4.4%, 4.6%, 4.7%, 4.8%, 4.9%, 5% are within the scope of the present invention.
As a preferred embodiment, the thickness of the graphene micro-sheet layer in this embodiment is 50 to 200 μm, preferably 100 μm, and others such as 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 110 μm, 120 μm, 130 μm, 140 μm, 160 μm, 170 μm.
As a preferred embodiment, the thickness of the polyamide support layer in this embodiment is 600-800 μm, the pore size of the polyamide support layer is 120-480 μm, the pore area is 45-50% of the membrane area, the thickness of the polyamide support is preferably 700 μm, the pore size of the polyamide support layer is 360 μm, the pore area is 48% of the membrane area, the thickness and the pore area of the support are related to the defect rate of the support, and the thickness and the pore area of the support are controlled within this range in this embodiment, thereby improving the membrane flux and also improving the membrane quality.
As a preferred embodiment, in the polyamide support layer in this embodiment, modified iso-alcohol polyoxyethylene ether is added to modify the polyamide support layer during the film forming process, and modified iso-alcohol polyoxyethylene ether is used for modification treatment, so that the diffusion rate and the reaction rate of the polyamide monomer can be increased, thereby increasing the membrane flux.
As a preferred embodiment, the thickness of the hydrophilic layer in this embodiment is 100-200 μm, preferably 150 μm, and other thicknesses such as 110 μm, 120 μm, 130 μm, 140 μm, 160 μm, 170 μm, 180 μm, 190 μm are also applicable.
As a preferred embodiment, the thickness of the hydrophobic layer in this embodiment is 80-120 μm, preferably 100 μm, and other thicknesses such as 80 μm, 90 μm, and 110 μm are also applicable.
Example 1
A direct drinking water treatment membrane containing graphene micro-sheets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, a graphene micro-sheet layer is arranged between the polyamide support body layer and the hydrophobic layer, the graphene micro-sheet layer and the polyamide support body layer are connected through a polyamide adhesive, the average diameter of the diatomite particles is 26, the addition amount of the diatomite particles in the polyamide support body layer is 4%, the thickness of the graphene micro-sheet layer is 50 microns, the thickness of the polyamide support body layer is 600 microns, the pore size of the polyamide support body layer is 120 microns, the pore area of the polyamide support body layer is 45% of the membrane area, and modified isomeric alcohol polyoxyethylene ether is added in the membrane forming process, the hydrophilic layer has a thickness of 100 μm and the hydrophobic layer has a thickness of 80 μm.
Example 2
A direct drinking water treatment membrane containing graphene micro-sheets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, the graphene micro-sheets are arranged between the polyamide support body layer and the hydrophobic layer, the graphene micro-sheets are connected with the polyamide support body layer through a polyamide adhesive, the average diameter of the diatomite particles is 27 mu m, the addition amount of the diatomite particles in the polyamide support body layer is 4.5%, the thickness of the graphene micro-sheets is 100 mu m, the thickness of the polyamide support body layer is 700 mu m, the pore size of the polyamide support body layer is 160 mu m, and the pore area of the polyamide support body layer is 46% of, the polyamide support layer is modified by adding modified isomeric alcohol polyoxyethylene ether in the film forming process, the thickness of the hydrophilic layer is 150 micrometers, and the thickness of the hydrophobic layer is 90 micrometers.
Example 3
A direct drinking water treatment membrane containing graphene micro-sheets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, the graphene micro-sheets are arranged between the polyamide support body layer and the hydrophobic layer, the graphene micro-sheets are connected with the polyamide support body layer through a polyamide adhesive, the average diameter of the diatomite particles is 28 micrometers, the addition amount of the diatomite particles in the polyamide support body layer is 4.5%, the thickness of the graphene micro-sheets is 100 micrometers, the thickness of the polyamide support body is preferably 700 micrometers, the pore diameter of the polyamide support body layer is 360 micrometers, and the pore area of the polyamide support body layer is 48% of the membrane area, the polyamide support layer is modified by adding modified isomeric alcohol polyoxyethylene ether in the film forming process, the thickness of the hydrophilic layer is 150 micrometers, and the thickness of the hydrophobic layer is 100 micrometers.
Example 4
A direct drinking water treatment membrane containing graphene micro-sheets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, the graphene micro-sheets are arranged between the polyamide support body layer and the hydrophobic layer, the graphene micro-sheets are connected with the polyamide support body layer through a polyamide adhesive, the average diameter of the diatomite particles is 28 micrometers, the addition amount of the diatomite particles in the polyamide support body layer is 4.6%, the thickness of the graphene micro-sheets is 60 micrometers, the thickness of the polyamide support body layer is 650 micrometers, the pore diameter of the polyamide support body layer is 180 micrometers, and the pore area of the polyamide support body layer is 48% of the membrane area, the polyamide support layer is modified by adding modified isomeric alcohol polyoxyethylene ether in the film forming process, the thickness of the hydrophilic layer is 160 mu m, and the thickness of the hydrophobic layer is 90 mu m.
Example 5
A direct drinking water treatment membrane containing graphene micro-sheets comprises a polyamide support body layer and a surface layer, wherein a plurality of diatomite particles are added in the polyamide support body layer, the surface layer comprises an upper surface layer and a lower surface layer, the upper surface layer is a hydrophilic layer, the hydrophilic layer is a polyethylene glycol-based hydrogel coating, the lower surface layer is a hydrophobic layer, the hydrophobic layer is a porous crystalline polypropylene coating, the graphene micro-sheets are arranged between the polyamide support body layer and the hydrophobic layer, the graphene micro-sheets are connected with the polyamide support body layer through a polyamide adhesive, the average diameter of the diatomite particles is 28 micrometers, the addition amount of the diatomite particles in the polyamide support body layer is 5%, the thickness of the graphene micro-sheets is 200 micrometers, the thickness of the polyamide support body layer is 800 micrometers, the pore diameter of the polyamide support body layer is 480 micrometers, and the pore area of the polyamide support body layer is 50% of the membrane area, the polyamide support layer is modified by adding modified isomeric alcohol polyoxyethylene ether in the film forming process, the thickness of the hydrophilic layer is 200 mu m, and the thickness of the hydrophobic layer is 120 mu m.
The preparation method of the direct drinking water treatment membrane containing the graphene microchip is the prior art, and is not repeated in the application.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides a straight drinking water treatment membrane that contains graphite alkene microchip which characterized in that: direct drinking water treatment membrane includes polyamide supporter layer and top layer, polyamide supporter in situ has added a plurality of diatomaceous earth granule, the top layer includes upper epidermis and lower top layer, the upper epidermis is hydrophilic layer, hydrophilic layer is polyethylene glycol base aquogel coating, the top layer is the hydrophobic layer down, the hydrophobic layer is porous crystalline polypropylene coating, be provided with graphite alkene microchip layer between polyamide supporter layer and the hydrophobic layer.
2. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the graphene micro-sheet layer is connected with the polyamide support layer through a polyamide adhesive.
3. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the diatomaceous earth particles have an average experienced size of 26-28 μm.
4. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the addition amount of the diatomite particles of the polyamide support layer is 4-5%.
5. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the thickness of the graphene micro-sheet layer is 50-200 mu m.
6. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the thickness of the polyamide support layer is 600-800 mu m, the pore size of the polyamide support layer is 120-480 mu m, and the pore area is 45-50% of the membrane area.
7. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the polyamide support layer is modified by adding modified isomeric alcohol polyoxyethylene ether in the film forming process.
8. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the thickness of the hydrophilic layer is 100-200 μm.
9. A direct drinking water treatment membrane containing graphene nanoplatelets as claimed in claim 1, wherein: the thickness of the hydrophobic layer is 80-120 μm.
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Denomination of invention: A Direct Drinking Water Treatment Membrane Containing Graphene Microsheets and Its Preparation Method Granted publication date: 20220125 Pledgee: China Construction Bank Corporation Nanjing Jianye sub branch Pledgor: NANJING GONGCHENG ENERGY SAVING NEW MATERIAL RESEARCH INSTITUTE Co.,Ltd. Registration number: Y2024980014239 |