CN108786487A - A kind of preparation and its application of functional form ultrafiltration membrane - Google Patents
A kind of preparation and its application of functional form ultrafiltration membrane Download PDFInfo
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- CN108786487A CN108786487A CN201810733795.5A CN201810733795A CN108786487A CN 108786487 A CN108786487 A CN 108786487A CN 201810733795 A CN201810733795 A CN 201810733795A CN 108786487 A CN108786487 A CN 108786487A
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- 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
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- 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
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- 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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/02—Hydrophilization
-
- 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
Abstract
The present invention provides the new function type ultrafiltration membrane that a kind of existing strainability has degradation function again, and the preparation of the ultrafiltration membrane need to prepare a kind of nano-complex modifying agent TiO with hydrophilic degradation function first2‑Fe3O4, which is blended with casting solution and carries out tablet film, then will be immersed with chaffy glass plate to reach phase separation in coagulating bath, to which the functional form ultrafiltration membrane with filterability and degradability be made.The ultrafiltration membrane that the method preparation time of the present invention is short, simple for process and prepared has a significant effect to the reduction of coking waste water COD, and therefore, the present invention will have good application prospect in terms of the processing of high concentrated organic wastewater.
Description
Technical field
The invention belongs to technical field of membrane separation, and in particular to a kind of nano-complex modification with hydrophilic degradation function
Agent TiO2-Fe3O4Preparation method and use it for the modified of poly (ether-sulfone) ultrafiltration membrane and prepare and modified ultrafiltration membrane is in coke
Change the application in wastewater treatment process.
Background technology
At the same time industry high speed development in China's will certainly cause a large amount of generations and discharge of industrial wastewater, especially greatly
The waste water for measuring reluctant hazardous contaminant, threat and the mankind to environment it is very harmful, at current China's waste water
Reason technology is not comparatively overripened, and existing further treatment technique there is a problem of different degrees of.Such as handle industrial wastewater
Cost it is higher, high energy consumption easy tos produce secondary pollution problems, thus explore technology for clarifying demand it is very urgent.Mesh
Preceding membrane separation technique is developed rapidly for wastewater treatment because its is at low cost, easy to operate, and wherein poly (ether sulfone) film has resistance to
Many excellent performances such as aging, chemicals-resistant, high temperature resistant.But so that its application is generated numerous difficulties because of the strong-hydrophobicity of PES,
For this purpose, we introduce Superhydrophilic, antibacterial inorganic material nano-TiO2It is modified for it, increases its hydrophily.Meanwhile Hen Duogong
Often contain the organic pollutions such as phenols, aldehydes in industry waste water.Advanced oxidation degradation is main as a kind of novel water technology
It is to generate the high hydroxyl radical free radical of activity to want principle, and the oxidation operation in waste water is degraded, desired to achieve the effect that, because
This is also acknowledged as one of the water technology of most foreground and potentiality.Good effect can be played to the processing of this Fenton method
Fruit, therefore have developed a kind of by Fe3O4It is supported on TiO2On nano composite modifying agent, can both increase the hydrophilic of PES films
Property, and the functional form ultrafiltration membrane of the COD of industrial wastewater can be reduced.
Invention content
The purpose of the present invention is in view of the drawbacks of the prior art, provide a kind of nano-complex with hydrophilic degradation function
Modifying agent TiO2-Fe3O4Preparation method and use it for the modified of poly (ether-sulfone) ultrafiltration membrane and prepare.The method of the present invention not only makes
Ultrafiltration membrane realizes hydrophily, but also ultrafiltration membrane is realized to the ability of organic matter in treatment of Coking Wastewater, makes COD rejections
It dramatically increases, maintains higher water flux.Modified ultrafiltration membrane prepared by the present invention has notable in Ultrafiltration experiment
Stability, widened the application range of Ultra filtration membrane technology.
To achieve the above object, technical scheme is as follows.
The first aspect of the invention discloses a kind of nano-complex modifying agent TiO with hydrophilic degradation function2-
Fe3O4Preparation method, include the following steps,
Step 1 weighs suitable TiO2In the conical flask equipped with 100ml deionized waters, with ultrasonic wave separating apparatus ultrasonic disperse
1 h adds suitable dilute hydrochloric acid, and pours into three-neck flask together, with 30 min of nitrogen flooding oxygen, and is heated to 80 DEG C.
Step 2, then with n (Fe2+)：n(Fe3+)=1:2 ratio weighs suitable green vitriol and anhydrous trichlorine
Change iron, is dissolved in 20 ml deionized waters, and be slowly added into the three-neck flask described in step 1, persistently stirs 1 h.
Step 3 accurately measures 1 ml concentrated ammonia liquors and is diluted to 10 ml with deionized water, is added dropwise with constant pressure funnel
In three-neck flask described in step 2,2 h are persistently stirred.
Step 4, the product that step 3 is obtained carry out Magneto separate, wash the product after separation repeatedly with deionized water extremely
Solution is in neutrality, and is filtered and is placed on dry 24 h in 60 DEG C of drying box, it is cooling after grinding to get to nano-TiO2-Fe3O4It is multiple
Close object.
The second aspect of the invention discloses a kind of system of the new function ultrafiltration membrane with filterability and degradation capability
Preparation Method includes the following steps,
Step 1, by modifying agent TiO prepared in casting solution raw material and claim 12-Fe3O4It is blended, and heats and stir
Dissolving is mixed, the casting solution containing modifying agent is obtained.
The casting solution containing modifying agent that step 1 obtains is poured on the glass plate of 15 × 25cm, then uses by step 2
Glass bar carries out the striking of ultrafiltration membrane；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s, be immersed in later
In 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is set to carry out gel inversion of phases, in glass pane surface
Film forming is precipitated.
Step 3, the ultrafiltration membrane that step 2 is obtained impregnates two days in deionized water, and changes a water per 6h, to remove
Remaining solvent on striping.
Step 4 at room temperature by the obtained film of step 3 carries out Ultrafiltration experiment under pressure, then carries out
The detection of COD.
It is preferred that the nano-TiO2For Detitanium-ore-type；
It is preferred that the high molecular polymer in the casting solution is polyether sulfone（PES）;
It is preferred that the pore-foaming agent in the casting solution is polyvinylpyrrolidone（PVP）, polyethylene glycol（PEG）, inorganic salts
（NaCl,AlCl3）Or above-mentioned arbitrary two kinds of combination；
It is preferred that the solvent in the casting solution is DMAC N,N' dimethyl acetamide（DMAc）, n,N-Dimethylformamide（DMF）.
A kind of preparation method of functional form ultrafiltration membrane with filterability and degradation capability of the present invention, use are molten
Agent-non-solvent phase switch technology is prepared, and remains on film after solvent the Ultrafiltration experiment for carrying out coking wastewater by removing, into
The H that a certain amount of volume fraction is 5% is first added before row Ultrafiltration experiment in coking wastewater2O2, and be uniformly mixed, then carry out
Fenton method combination membrane filtrations carry out the filtration experiment of coking wastewater, and the present invention achieves significant technology in this experiment
Progress can have good application prospect in high concentrated organic wastewater processing.
Description of the drawings
Fig. 1 is the variation diagram of flux and COD rejections that the present invention carries out Treatment of Coking Effluent.
Fig. 2 is Ultrafiltration experiment installation drawing
Specific implementation mode
With reference to specific embodiment and attached drawing, the present invention will be further described.
Prepared film is to use coking wastewater as test solution under room temperature and 0.1MPa, and it is useless to determine coking respectively
Water flux and COD rejections.
Embodiment 1
Weigh the TiO of 0.2wt%2-Fe3O4Modifying agent and 75 g DMAC N,N' dimethyl acetamides mixed in conical flask be placed in it is super
The polyether sulfone and 7g polyvinylpyrrolidones and uniform of 18g is added in 1 h of ultrasonic disperse in sound wave separating apparatus after it is uniformly dispersed
Mixing is then placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be placed in 60 DEG C
Standing and defoaming 4h in vacuum tank, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of embodiment 1.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by embodiment 1 under room temperature and 0.1MPa, coking wastewater flux is 143.86L/m2H is right
Coking wastewater COD rejections are 57.86%.
Comparative example 1
The polyether sulfone of 18g and being added in the DMAC N,N' dimethyl acetamide solvent of 75g for 7g polyvinylpyrrolidones are uniformly mixed
It closes, is placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be subsequently placed in 60 DEG C of vacuum
Standing and defoaming 4h in case, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of comparative example 1.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by comparative example 1 under room temperature and 0.1MPa, coking wastewater flux is 76.38L/m2H, focusing
It is 41.22% to change waste water COD rejection.
Embodiment 2
Weigh the TiO of 0.4wt%2-Fe3O4Modifying agent and 75 g DMAC N,N' dimethyl acetamides mixed in conical flask be placed in it is super
The polyether sulfone and 7g polyvinylpyrrolidones and uniform of 18g is added in 1 h of ultrasonic disperse in sound wave separating apparatus after it is uniformly dispersed
Mixing is then placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be placed in 60 DEG C
Standing and defoaming 4h in vacuum tank, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of embodiment 2.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by embodiment 2 under room temperature and 0.1MPa, coking wastewater flux is 93.15L/m2H, focusing
It is 71.49% to change waste water COD rejection.
Embodiment 3
Weigh the TiO of 0.6wt%2-Fe3O4Modifying agent and 75 g DMAC N,N' dimethyl acetamides mixed in conical flask be placed in it is super
The polyether sulfone and 7g polyvinylpyrrolidones and uniform of 18g is added in 1 h of ultrasonic disperse in sound wave separating apparatus after it is uniformly dispersed
Mixing is then placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be placed in 60 DEG C
Standing and defoaming 4h in vacuum tank, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of embodiment 3.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by embodiment 3 under room temperature and 0.1MPa, coking wastewater flux is 106.73L/m2H is right
Coking wastewater COD rejections are 81.22%.
Embodiment 4
Weigh the TiO of 0.8wt%2-Fe3O4Modifying agent and 75 g DMAC N,N' dimethyl acetamides mixed in conical flask be placed in it is super
The polyether sulfone and 7g polyvinylpyrrolidones and uniform of 18g is added in 1 h of ultrasonic disperse in sound wave separating apparatus after it is uniformly dispersed
Mixing is then placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be placed in 60 DEG C
Standing and defoaming 4h in vacuum tank, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of embodiment 4.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by embodiment 4 under room temperature and 0.1MPa, coking wastewater flux is 115.49L/m2H is right
Coking wastewater COD rejections are 90.47%.
Embodiment 5
Weigh the TiO of 1.0wt%2-Fe3O4Modifying agent and 75 g DMAC N,N' dimethyl acetamides mixed in conical flask be placed in it is super
The polyether sulfone and 7g polyvinylpyrrolidones and uniform of 18g is added in 1 h of ultrasonic disperse in sound wave separating apparatus after it is uniformly dispersed
Mixing is then placed in water-bath with 75 DEG C of heated at constant temperature and magnetic agitation 12h, so that it is fully dissolved, be placed in 60 DEG C
Standing and defoaming 4h in vacuum tank, to remove the remaining bubble inside solution to get to casting solution.
Casting solution, is poured on the glass plate of 15 × 25cm by the preparation that ultrafiltration membrane is carried out using the method for tablet film first
On, the striking of ultrafiltration membrane is then carried out with glass bar；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s,
It is immersed in later in 30 DEG C of coagulating bath, the high molecular polymer in the casting solution on glass plate is made to carry out gel inversion of phases,
Film forming is precipitated in glass pane surface.
Then ultrafiltration membrane is taken out and is impregnated two days in deionized water, and a water is changed per 6h, remained on striping with removing
Solvent, ultrafiltration membrane after being cleaned is to get to the ultrafiltration membrane of embodiment 5.
By the ultrafiltration membrane after above-mentioned cleaning at room temperature with the coke to being pre-mixed hydrogen peroxide under the pressure of 0.1MPa
Change waste water and carries out Ultrafiltration experiment.
For ultrafiltration membrane prepared by embodiment 5 under room temperature and 0.1MPa, coking wastewater flux is 109.83L/m2H is right
Coking wastewater COD rejections are 88.31%.
Addition different content TiO prepared by above example 1, embodiment 2, embodiment 3, embodiment 4, embodiment 52-
Fe3O4The ultrafiltration membrane of modifying agent is compared with the ultrafiltration membrane for not adding modifying agent in comparative example 1, as seen from Figure 1, with TiO2-
Fe3O4Coking waste water COD rejection is being continuously improved in the increase of modifying agent additive amount, ultrafiltration membrane, when additive amount is 0.8wt%
It is that the rejection of COD is optimal, and water flux is also relatively stable, can be obtained by overall merit, TiO in the present invention2-
Fe3O4When the best additive amount of modifying agent is 0.8wt%, the comprehensive performance of film is best.
Claims (8)
1. a kind of nano-complex modifying agent TiO with hydrophilic degradation function2-Fe3O4Preparation method, which is characterized in that packet
Include following steps,
Step 1 weighs suitable TiO2In the conical flask equipped with 100ml deionized waters, about 1 h of ultrasonic disperse is carried out, then add
Enter suitable dilute hydrochloric acid, and pour into three-neck flask, with 30 min of nitrogen flooding oxygen, and is heated to 80 DEG C.
Step 2, then with n (Fe2+)：n(Fe3+)=1:2 ratio weighs suitable green vitriol and anhydrous ferric trichloride,
It is dissolved in 20 ml deionized waters, and is slowly added into the three-neck flask described in step 1, persistently stir 1 h.
Step 3 accurately measures 1 ml concentrated ammonia liquors and is diluted to 10 ml with deionized water, step is added dropwise to constant pressure funnel
In three-neck flask described in rapid two, 2 h are persistently stirred.
Step 4, the product that step 3 is obtained carry out Magneto separate, wash the product after separation repeatedly with deionized water to solution
Be in neutrality, filter and be placed on dry 24 h in 60 DEG C of drying box, it is cooling after grinding to get to nano-TiO2-Fe3O4Compound.
2. a kind of nano-complex modifying agent TiO with hydrophilic degradation function according to claim 12-Fe3O4System
Preparation Method it is characterized in that, described in step 1 to be heated to 80 DEG C refer to being heated to after 80 DEG C in whole preparation process temperature all
Stablize at 80 DEG C.
3. a kind of nano-complex modifying agent TiO with hydrophilic degradation function according to claim 12-Fe3O4System
Preparation Method refers to the protection that nitrogen will be carried out in whole preparation process it is characterized in that, nitrogen flooding oxygen described in step 1, is prevented
Only product is oxidized to Fe2O3。
4. a kind of preparation method of the new function ultrafiltration membrane with filterability and degradation capability, which is characterized in that including as follows
Step,
Step 1, by modifying agent TiO prepared in casting solution raw material and claim 12-Fe3O4It is blended, and heats and stir
Dissolving is mixed, the casting solution containing modifying agent is obtained.
The casting solution containing modifying agent that step 1 obtains is poured on the glass plate of 15 × 25cm, then uses glass by step 2
Stick carries out the striking of ultrafiltration membrane；By the glass plate containing membrane coat in the air of room temperature prevapourising 40s, be immersed in 30 DEG C later
Coagulating bath in, so that high molecular polymer on glass plate in casting solution is carried out gel inversion of phases, glass pane surface be precipitated at
Film.
Step 3, the ultrafiltration membrane that step 2 is obtained impregnates two days in deionized water, and changes a water per 6h, to remove striping
Upper remaining solvent.
Step 4 at room temperature by the obtained film of step 3 carries out Ultrafiltration experiment under pressure, then carries out COD
Detection.
5. a kind of preparation method of new function ultrafiltration membrane with filterability and degradation capability according to claim 4,
It is characterized in that, the raw material of the casting solution described in step 1 includes being remembered with mass fraction, 18% high molecular polymer, 7%
Pore-foaming agent and 75% solvent；It is preferred that the high molecular polymer in the casting solution is polyether sulfone（PES）;It is preferred that the casting
Pore-foaming agent in film liquid is polyvinylpyrrolidone（PVP）, polyethylene glycol（PEG）, inorganic salts（NaCl,AlCl3）Or above-mentioned
The combination of two kinds of meaning；It is preferred that the solvent in the casting solution is DMAC N,N' dimethyl acetamide（DMAc）, N, N- dimethyl formyls
Amine（DMF）.
6. a kind of preparation method of new function ultrafiltration membrane with filterability and degradation capability according to claim 4,
It is characterized in that, coagulating bath described in step 2 is deionized water, alcohol, or both different proportion mixed solution.
7. a kind of preparation method of new function ultrafiltration membrane with filterability and degradation capability according to claim 4,
It is characterized in that, the detection of the COD described in step 4 is using potassium dichromate method.
8. a kind of preparation method of new function ultrafiltration membrane with filterability and degradation capability according to claim 4,
It is characterized in that, the certain pressure described in step 4 carries out Ultrafiltration experiment, deionized water is carried out under the pressure of 0.1MPa first
Then precompressed 10min changes coking wastewater into and carries out Ultrafiltration experiment under the pressure of 0.1MPa.
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| CN112023724A (en) * | 2020-08-25 | 2020-12-04 | 广州大学 | Modified polyvinylidene fluoride ultrafiltration membrane and preparation method thereof |
| CN114452818A (en) * | 2020-11-10 | 2022-05-10 | 南京理工大学 | Ultrafiltration membrane based on separation-catalysis structure and preparation method thereof |
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