CN111379074A - Preparation method of cellulose nanofiber composite membrane for treating printing and dyeing wastewater - Google Patents
Preparation method of cellulose nanofiber composite membrane for treating printing and dyeing wastewater Download PDFInfo
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- CN111379074A CN111379074A CN201811618865.9A CN201811618865A CN111379074A CN 111379074 A CN111379074 A CN 111379074A CN 201811618865 A CN201811618865 A CN 201811618865A CN 111379074 A CN111379074 A CN 111379074A
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- dyeing wastewater
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
-
- 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
- B01D67/0002—Organic membrane manufacture
-
- 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
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
- B01D71/10—Cellulose; Modified cellulose
-
- 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
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
Abstract
The invention discloses a preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater, which comprises the following steps: selecting a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, and selectively oxidizing the fiber slurry to obtain an aqueous dispersion of cellulose nanofibers; dissolving the film-forming polymer powder, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum to prepare electrostatic spinning solution, and forming a polymer nanofiber membrane layer on a non-woven fabric substrate by using the electrostatic spinning solution to prepare an electrostatic spinning polymer nanofiber membrane; coating a layer of aqueous dispersion on the surface of a polymer nanofiber membrane layer of the electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane; the multilayer structure composite membrane is placed in an oven, and the method is low in cost, easy to operate and capable of being popularized and applied.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater.
Background
China is the first big country of the textile printing and dyeing industry, the textile printing and dyeing industry is an industrial waste water discharge consumer, and according to incomplete statistics, the printing and dyeing waste water discharge amount of China is about 300-400 million tons per day. At present, the treatment of the printing and dyeing wastewater in China generally adopts conventional secondary treatment, namely primary physicochemical treatment and secondary biochemical treatment. However, due to the specific water quality characteristics of the printing and dyeing wastewater and the continuous improvement of related standards, the effluent quality of the conventional secondary treatment cannot meet the high-standard discharge and reuse requirements. The effluent of the conventional secondary treatment contains part of iron colloid and divalent metal ions besides high content of micromolecule organic matter, so that the main aim of the advanced treatment of the printing and dyeing wastewater is to remove the salt content and the micromolecule organic matter which is difficult to degrade in the water.
The membrane separation technology refers to a technology for realizing selective separation of a mixture of molecules with different particle sizes through a semipermeable membrane. The semipermeable membrane is also called a separation membrane or a filter membrane, and the membrane wall is filled with small holes and can be divided into a microfiltration Membrane (MF), an ultrafiltration membrane (UF), a nanofiltration membrane (NF), a reverse osmosis membrane (RO) and the like according to the pore size. The membrane separation technology can not only reduce the mass concentration and chromaticity of organic substances in water, but also remove inorganic salts. However, most membrane materials have poor hydrophilic performance, which causes the defects of easy pollution and blockage, and people often modify the membrane materials by some physical or chemical methods.
Recently, some scholars have tried to adopt Al2O3、SiO2、TiO2Inorganic nano particles and organic substances are used for modifying membrane materials, and composite membranes with high performance are prepared, but the manufacturing cost of the membranes is too high, and the preparation of the membranes is highThe process is too complex and is not suitable for large-scale popularization and application. Cellulose is the most abundant and biodegradable regenerated natural high polymer in the world, and cellulose nano-fiber is micro-scale cellulose fiber separated from natural cellulose and has the characteristics of reproducibility, low density, low cost, biodegradability, high strength, high elastic modulus and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the cellulose nanofiber composite membrane for treating the printing and dyeing wastewater is low in cost, easy to operate and capable of being popularized and applied, and solves the problems that the existing printing and dyeing wastewater treatment method adopting a traditional treatment method is high in cost and easy to cause pollution and blockage.
In order to solve the technical problems, the technical scheme of the invention is as follows: a preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 20-80 ℃ for 1-12 hours to prepare an electrostatic spinning solution, and forming a polymer nanofiber membrane layer on a non-woven fabric substrate by using a PET or PP non-woven fabric as the substrate of electrostatic spinning to prepare an electrostatic spinning polymer nanofiber membrane with the thickness of 10-100 mu m;
3) coating a cellulose nanofiber aqueous dispersion with the thickness of 0.2-1.5 mm on the surface of a polymer nanofiber membrane layer of an electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying for 5-70 minutes at 50-150 ℃ to obtain a cellulose nanofiber composite membrane finished product.
Preferably, in the step 2), the thickness of the electrospun polymer nanofiber membrane is 50-100 μm.
As a preferable scheme, the film-forming polymer in step 2) is one of polyethersulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride.
As a preferable scheme, in the process of preparing the electrostatic spinning solution, the film-forming polymer solution is defoamed in vacuum at 50-80 ℃ for 3-12 hours.
Preferably, the thickness of the aqueous dispersion of cellulose nanofibers in the coating film is 1 to 1.5 mm.
As a preferable scheme, the drying condition of the multilayer structure composite membrane is that the multilayer structure composite membrane is dried for 5-50 minutes at 80-150 ℃.
As a preferable scheme, the drying condition of the multilayer structure composite membrane is drying at 100 ℃ for 40 minutes.
As a preferable scheme, the organic solvent in step 2) may be one or more selected from triethanolamine, dimethylacetamide, dimethylsulfoxide, and an alkaline aqueous solution.
After the technical scheme is adopted, the invention has the effects that: the preparation method of the cellulose nanofiber composite membrane for treating printing and dyeing wastewater is low in cost and easy to operate, and the cellulose nanofiber has the characteristics of reproducibility, low density, low cost, biodegradability, high strength, high elastic modulus and the like, so that the cellulose nanofiber composite membrane can be popularized and applied, and the cellulose nanofiber also has strong hydrophilicity, and the surface of the hydrophilic membrane and water molecules can form an ordered hydrogen bond structure, so that the adsorption behavior and the adsorption quantity of hydrophobic pollutants on the surface of the membrane are reduced, the pollutants on the surface of the membrane can be removed by a physical cleaning method, membrane damage caused by chemical cleaning is avoided, and the good sewage treatment performance of the composite membrane is still maintained after the composite membrane is used for a long time.
Detailed Description
The present invention is described in further detail below with reference to specific examples.
Cellulose is one of the film materials widely used at present, and has the advantages of low cost, high selectivity, simple film preparation process, good film forming property and the like, cellulose nano-fiber also has strong hydrophilicity, and the surface of the hydrophilic film and water molecules can form an ordered hydrogen bond structure, so that the adsorption behavior and the adsorption quantity of hydrophobic pollutants on the surface of the film are reduced, the pollutants on the surface of the film can be removed by a physical cleaning method, and the damage of the film caused by chemical cleaning is avoided, thereby having important significance for the functional application of degradable natural environment-friendly materials and cellulose materials of the open products.
Example 1
A preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 20 ℃ for 12 hours to prepare an electrostatic spinning solution, taking a PET (polyethylene terephthalate) or PP (polypropylene) non-woven fabric as an electrostatic spinning matrix, and forming a polymer nanofiber membrane layer on the non-woven fabric matrix by using the electrostatic spinning solution to prepare an electrostatic spinning polymer nanofiber membrane with the thickness of 10 mu m, wherein the film-forming polymer is one of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride;
3) coating a cellulose nanofiber aqueous dispersion with the thickness of 0.2mm on the surface of a polymer nanofiber membrane layer of the electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying at 150 ℃ for 5 minutes to obtain a finished product of the cellulose nanofiber composite membrane.
Example 2
A preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 80 ℃ for 1 hour to prepare an electrostatic spinning solution, taking a PET or PP non-woven fabric as an electrostatic spinning matrix, and forming a polymer nanofiber membrane layer on the non-woven fabric matrix by using the electrostatic spinning solution to prepare the electrostatic spinning polymer nanofiber membrane with the thickness of 100 mu m, wherein the film-forming polymer is one or more of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride, and the organic solvent can be one or more of triethanolamine, dimethylacetamide, dimethyl sulfoxide and an alkaline aqueous solution;
3) coating a cellulose nanofiber aqueous dispersion solution with the thickness of 1.5mm on the surface of a polymer nanofiber membrane layer of the electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying at 50 ℃ for 70 minutes to obtain a finished product of the cellulose nanofiber composite membrane.
Example 3
A preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 50 ℃ for 3 hours to prepare an electrostatic spinning solution, taking a PET or PP non-woven fabric as an electrostatic spinning matrix, forming a polymer nanofiber membrane layer on the non-woven fabric matrix by using the electrostatic spinning solution to prepare the electrostatic spinning polymer nanofiber membrane with the thickness of 50 mu m, wherein the film-forming polymer is one of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride, and the organic solvent can be one or more of triethanolamine, dimethylacetamide, dimethyl sulfoxide and an alkaline aqueous solution.
3) Coating a cellulose nanofiber aqueous dispersion with the thickness of 1mm on the surface of a polymer nanofiber membrane layer of an electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying for 50 minutes at 100 ℃ to obtain a cellulose nanofiber composite membrane finished product.
Example 4
A preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 20 ℃ for 12 hours to prepare an electrostatic spinning solution, taking a PET (polyethylene terephthalate) or PP (polypropylene) non-woven fabric as an electrostatic spinning matrix, and forming a polymer nanofiber membrane layer on the non-woven fabric matrix by using the electrostatic spinning solution to prepare an electrostatic spinning polymer nanofiber membrane with the thickness of 50 mu m, wherein the film-forming polymer is one or more of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride;
3) coating a cellulose nanofiber aqueous dispersion solution with the thickness of 1.5mm on the surface of a polymer nanofiber membrane layer of the electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying for 40 minutes at 100 ℃ to obtain a cellulose nanofiber composite membrane finished product.
Wherein the organic solvent in the step 2) can be one or more of triethanolamine, dimethylacetamide, dimethyl sulfoxide and alkaline aqueous solution.
The cellulose nanofiber composite membrane for treating the printing and dyeing wastewater can be arranged in various filtering devices in the application process, realizes large-range and multi-type application, and can be popularized and applied in the field of printing and dyeing wastewater treatment.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (8)
1. A preparation method of a cellulose nanofiber composite membrane for treating printing and dyeing wastewater comprises the following steps:
1) selecting one of bamboo, wood, cotton or hemp as a cellulose, stirring the cellulose on a magnetic stirrer, dissociating the cellulose into fiber slurry, selectively oxidizing the fiber slurry, and then sequentially passing through an ultrasonic cell disruption instrument and a refining instrument to obtain an aqueous dispersion of cellulose nanofibers;
2) dissolving film-forming polymer powder in a polar organic solvent, stirring on a magnetic stirrer to obtain a film-forming polymer solution, defoaming the film-forming polymer solution in vacuum at 20-80 ℃ for 1-12 hours to prepare an electrostatic spinning solution, and forming a polymer nanofiber membrane layer on a non-woven fabric substrate by using a PET or PP non-woven fabric as the substrate of electrostatic spinning to prepare an electrostatic spinning polymer nanofiber membrane with the thickness of 10-100 mu m;
3) coating a cellulose nanofiber aqueous dispersion with the thickness of 0.2-1.5 mm on the surface of a polymer nanofiber membrane layer of an electrostatic spinning polymer nanofiber membrane to form a cellulose nanofiber membrane layer, and preparing a multilayer structure composite membrane;
4) and (3) placing the multilayer structure composite membrane in an oven, and drying for 5-70 minutes at 50-150 ℃ to obtain a cellulose nanofiber composite membrane finished product.
2. The method for preparing the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 1, wherein the method comprises the following steps: in the step 2), the thickness of the electrospun polymer nanofiber membrane is 50-100 microns.
3. The method for preparing the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 1, wherein the method comprises the following steps: the film-forming polymer in the step 2) is one of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride.
4. A method for preparing a cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in any one of claims 1 to 3, wherein: and in the process of preparing the electrostatic spinning solution, the film-forming polymer solution is defoamed in vacuum at 50-80 ℃ for 3-12 hours.
5. The preparation method of the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 4, wherein the preparation method comprises the following steps: the thickness of the aqueous dispersion of the cellulose nanofibers during film coating is 1-1.5 mm.
6. The method for preparing the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 5, wherein the method comprises the following steps: the drying condition of the multilayer structure composite membrane is drying for 5-50 minutes at 80-150 ℃.
7. The preparation method of the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 6, wherein the preparation method comprises the following steps: the drying condition of the multilayer structure composite membrane is drying for 40 minutes at 100 ℃.
8. The method for preparing the cellulose nanofiber composite membrane for treating printing and dyeing wastewater as claimed in claim 1, wherein the method comprises the following steps: the organic solvent in step 2) may be one or more selected from triethanolamine, dimethylacetamide, dimethylsulfoxide, and an alkaline aqueous solution.
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| CN201811618865.9A CN111379074A (en) | 2018-12-28 | 2018-12-28 | Preparation method of cellulose nanofiber composite membrane for treating printing and dyeing wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112226911A (en) * | 2020-09-22 | 2021-01-15 | 上海世龙科技有限公司 | Hydrophilic composite membrane and preparation method thereof |
| GB2616026A (en) * | 2022-02-24 | 2023-08-30 | Modla Ppe Ltd | Filter material |
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| US20140076797A1 (en) * | 2012-09-20 | 2014-03-20 | Korea Institute Of Science And Technology | Fiber-based filter with nanonet layer and preparation method thereof |
| CN105032202A (en) * | 2015-07-01 | 2015-11-11 | 上海洁晟环保科技有限公司 | Multilayer composite ultrafiltration membrane and preparation method thereof |
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| GB2616026A (en) * | 2022-02-24 | 2023-08-30 | Modla Ppe Ltd | Filter material |
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