CN105582816A - Preparation method of forward osmosis membrane modified with oxidized graphene - Google Patents
Preparation method of forward osmosis membrane modified with oxidized graphene Download PDFInfo
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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
- B01D71/08—Polysaccharides
- B01D71/12—Cellulose derivatives
- B01D71/14—Esters of organic acids
- B01D71/16—Cellulose acetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/002—Forward osmosis or direct osmosis
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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
- B01D69/10—Supported membranes; Membrane supports
Abstract
The invention provides a preparation method of a forward osmosis membrane modified with oxidized graphene. The preparation method comprises the following steps: 1, firstly, conducting ultrasonic dispersion on the oxidized graphene in high-polarity organic solvent, so that homogeneous dispersion liquid is obtained; 2, adding organic solvent of raw materials of a produced membrane to the dispersion liquid; 3, sequentially adding additives and the produced membrane to the dispersion liquid obtained in step 2, and stirring the mixture till the mixture is dissolved completely, so that casting membrane liquid is obtained; 4, conducting sufficient defoaming on the casting membrane liquid in a vacuum drying box, then pouring the casting membrane liquid on a glass plate where a support layer is laid, and conducting membrane scraping; 5, after membrane pouring is ended and the casting membrane liquid is volatilized in air, putting the casting membrane liquid in a coagulation bath; 6, separating a membrane piece with the glass plate, and putting the membrane piece into pure water for immersion; 7, conducting natural drying on the membrane which is sufficiently immersed as mentioned above, so that the forward osmosis membrane is obtained. The modified forward osmosis membrane prepared through the preparation method is good in hydrophilicity and water flux and great in antipollution capability, cleaning expense of the membrane is lowered, the service life of the membrane is greatly prolonged, and mechanical properties are improved a lot.
Description
Technical field
That the present invention relates to is the preparation method of diffusion barrier in life, is specifically related to a kind of preparation method who adopts graphene oxide modification forward osmosis membrane.
Background technology
Forward osmosis membrane isolation technics is a kind of emerging technology, and this technology is utilized natural phenomenon of osmosis, alleviates the not pressure of water and the energy, is described as water purification and the desalting technology of forefront, tool potentiality in the world. Just permeating and referring to that water is from flowing to compared with the process of hyperosmosis one side by permselectivity membrane compared with Hyposmolality solution one side. Forward osmosis membrane isolation technics, just using the permeable pressure head of forward osmosis membrane both sides solution as driving force, makes water spontaneously to see through permselectivity membrane from low concentration one side and arrives high concentration-side. Positive infiltration technology has been applied in the processes such as desalinization, high-salt wastewater processing, energy generating. In water treatment field, just permeating and thering is as follows advantage significantly: (1) is different from traditional pressure drive membrane (micro-filtration, ultrafiltration, nanofiltration, counter-infiltration), forward osmosis membrane Separation of Water molecule can separate without additional hydraulic pressure from material liquid, there is lower film pollution tendencies, research shows that forward osmosis membrane rinses through simple, can recover higher water flux; (2) positive process of osmosis has higher interception capacity, and research shows most of salt ion in seawater, and phosphate, organic micro-pollutants in sewage can be by forward osmosis membrane effectively catchings; Adopt identical semipermeable membrane, just permeating interception capacity under the method for operation higher than counter-infiltration; (3) forward osmosis membrane can utilize the permeable pressure head of solution as the driving force of water processed, and this is that the cheap liquid (as seawater, reverse osmosis concentrated water etc.) that utilizes some to have hyperosmosis carries out water treatment new approach is provided. At present positive infiltration technology is studied much discussion in fields such as desalinization, wastewater treatment and reuse, material are concentrated, shows tempting prospect.
The key of positive permeability and separation technology is efficient forward osmosis membrane, but the membrane material getting up as a kind of newly-developed, forward osmosis membrane synthetic technology is also immature. The feature of positive infiltration technology requires forward osmosis membrane should have hydrophily, can reduce water like this and penetrate the resistance of separation membrane, also wish that forward osmosis membrane has good mechanical strength, can make the film separating layer of preparation thinner simultaneously, filtration resistance is low, but cracky not in use. Therefore, make forward osmosis membrane there is good hydrophily and mechanical strength is the target of pursuing in forward osmosis membrane modification.
In the patent document of CN102580562A, disclose in the patent document that discloses " preparation method of the compound forward osmosis membrane of a kind of Graphene/polypyrrole " and CN104548968A in the patent document of " a kind of preparation method of polyvinylidene fluoride composite cellulose acetate forward osmosis membrane ", CN103301758A and disclose " compound forward osmosis membrane of a kind of Kevlar nanofiber and preparation method thereof and application ", the above-mentioned method of preparing forward osmosis membrane all belongs to interfacial polymerization, and interior concentration polarization is large, flux is unstable, intensity is low. The present invention is different from interfacial polymerization, adopts phase inversion.
Summary of the invention
The object of the present invention is to provide a kind of hydrophily and mechanical strength that can improve forward osmosis membrane, thereby improve the preparation method of the graphene oxide modification forward osmosis membrane of the serviceability of the forward osmosis membrane of preparation.
The object of the present invention is achieved like this:
(1) first by GO in strong polar organic solvent, under ultrasound condition, disperse 10～100 minutes, make uniform dispersion;
(2) organic solvent of masking raw material is joined in described dispersion liquid, stir and form the finely dispersed dispersion liquid of GO;
(3) additive, masking are joined successively in the dispersion liquid that step (2) obtains, at the temperature of 40 DEG C～90 DEG C, continuous stirring 6 hours is above to dissolving completely, makes the homodisperse casting solution of graphene oxide;
(4) described casting solution fully after deaeration, is poured on the glass plate that is covered with supporting layer in vacuum drying chamber, carries out knifing with knifing machine;
(5) water film after casting solution in air, volatilize after 5～100 seconds, put into coagulating bath, coagulation bath temperature is 10 DEG C～60 DEG C;
(6) diaphragm is separated with glass plate, diaphragm is put in pure water and soaked more than 6 hours;
(7) after natural drying the film of above-mentioned abundant immersion, obtain forward osmosis membrane.
The present invention can also comprise:
1, described strong polar organic solvent is dimethylacetylamide (DMAC) or dimethyl formamide (DMF).
2, the organic solvent of described masking raw material is acetone, Isosorbide-5-Nitrae-dioxane or the mixture of the two.
3, described masking raw material is Triafol T (CTA), cellulose acetate (CA) or the mixture of the two; Described additive is lactic acid, methyl alcohol or the mixture of the two.
4, described supporting layer is nonwoven or polyester screen.
5, solidification liquid adopts the aqueous solution of the organic solvent of ultra-pure water, 10%～30% alcoholic solution or 10%～30%.
The present invention can have following combination:
1, dull and stereotyped Triafol T (CTA) forward osmosis membrane of a kind of graphene oxide, masking raw material is that the organic solvent of Triafol T, masking raw material is acetone and 1,4-dioxane, additive are lactic acid and methyl alcohol, polar organic solvent is dimethylacetylamide by force, and the percetage by weight of each component is as follows:
2, dull and stereotyped cellulose acetate (CA) forward osmosis membrane of a kind of graphene oxide, masking raw material is that the organic solvent of cellulose acetate, masking raw material is that acetone, additive are lactic acid and methyl alcohol, polar organic solvent is dimethylacetylamide by force, and the percetage by weight of each component is as follows:
3, the dull and stereotyped cellulose acetate of a kind of graphene oxide (CA)+Triafol T (CTA) forward osmosis membrane, masking raw material is that the organic solvent of Triafol T and cellulose acetate, masking raw material is acetone and 1,4-dioxane, additive are lactic acid and methyl alcohol, polar organic solvent is dimethylacetylamide by force, and the percetage by weight of each component is as follows:
Main operational factor in film-forming process is as follows:
Forward osmosis membrane separation process all adopts active layer towards drawing liquid (PRO) pattern. In film test process, draw the glucose that liquid is 2M, the sodium chloride that material liquid is 0.2M.
Graphene oxide (GO) is a kind of by cellular two dimensional surface film of being of monolayer carbon atomic building, and its chemical composition is to be mainly made up of containing oxygen group carbon atom and polarity. GO has the two-dimension plane structure similar with Graphene, different is that GO is because oxidation has been introduced a large amount of polarity oxygen-containing functional groups on the surface of carbon skeleton, as-O-,-COOH ,-(Fig. 1 are the graphene oxide infrared spectrogram that laboratory makes) such as OH, the complexity .GO layer that the existence of these oxygen-containing functional groups has increased GO structure is connected by a large amount of hydrogen bonds with interlayer, in two-dimension plane structure, to be connected compared with strong covalent bond, this structure makes it have extremely strong hydrophily. The network structure feature of simultaneous oxidation Graphene two dimension makes it in the time adding in composite, can form multiple combination with polymer molecule, thereby composite is had to humidification, in addition, due to the larger specific area of graphene oxide, the contact area of he and polymer body is very large, so can significantly improve the mechanical performance of polymer. Therefore, graphene oxide is had to feasibility for hydrophily and the mechanical strength of improving forward osmosis membrane. And, because graphene oxide has very unique two-dimensional network structure, and a large amount of hydrophilic radical, be expected to produce satisfied modified effect with few dosage that adds. But so far, there is not yet employing phase inversion, the formula of graphene oxide modification forward osmosis membrane and the report of synthesis technologic parameter. This is main innovation content of the present invention.
Meanwhile, by graphene oxide effectively and be dispersed in forward osmosis membrane, be how the key technology of preparing graphene oxide modification forward osmosis membrane. Graphene oxide surface can be very large, is easy to occur agglomeration, if disperse the uneven latent stress centrostigma that tends to become material in polymeric matrix, thereby affects the serviceability of this material. For nano material, its dispersiveness in film is better, and the mechanical performance to film and the enhancing of compressive property are more obvious. What it disperseed in polymeric matrix is good and bad, and the compatibility of casting solution is had a great impact, and compatibility has directly determined that this blend whether can film forming, and whether performance after film forming meets the demands. Exploring the method that graphene oxide is dispersed in forward osmosis membrane casting solution is another main innovation content of the present invention.
In traditional Triafol T (CTA) or cellulose acetate forward osmosis membrane building-up process, often adopting acetone and Isosorbide-5-Nitrae dioxane mixed solvent is organic solvent. but graphene oxide is can not fine uniform dispersion in organic solvent at acetone and Isosorbide-5-Nitrae dioxane mixed solvent, can form obvious aggregate, even if stir in routine, ultrasonic etc. dispersion under technological means, aggregate still can exist. but inventor herein finds GO and can be effectively dispersed in strong polar organic solvent (as N-N, dimethylacetylamide (DMAC) or N-N, dimethyl formamide (DMF)) in, therefore, the dispersion GO method that the present invention adopts is: first GO is dispersed in strong polar organic solvent, form the homodisperse dispersion liquid of GO, again by the organic solvent of preparing forward osmosis membrane (as above-mentioned acetone or 1, 4 dioxane or the mixed liquor of the two) be dispersed in GO dispersion liquid, form strong polar organic solvent/acetone/1 of GO/, the blend solution of 4 dioxane, improve by this method the compatibility of GO in casting solution, solve the problem of GO bad dispersibility in forward osmosis membrane.
To sum up, the present invention adopts immersion precipitation phase inversion to prepare modification enhanced oxygen functionalized graphene forward osmosis membrane, first, using polar solvent DMAC or DMF as the dispersant of GO, makes in dispersed this solvent of GO, forms the homodisperse dispersion liquid film of GO; And then, add successively the organic solvent of preparing for forward osmosis membrane (as acetone or Isosorbide-5-Nitrae dioxane or the mixed solvent of the two) and masking raw material to GO dispersion liquid, make the homodisperse casting solution of GO; Then, explore parameters of preparation and optimum formula, prepare good GO modification forward osmosis membrane, improve hydrophily and the mechanical strength of forward osmosis membrane. Thereby improve the serviceability of the forward osmosis membrane of preparation.
Advantage of the present invention is mainly reflected in:
1) graphene oxide can be evenly dispersed in casting solution, is easy to film forming, and synthetic membrane material hydrophilicity and mechanical performance are better to improve. Figure 2 shows that the dispersiveness of graphene oxide in different solvents, can significantly observe graphene oxide dispersed in mixed solvent DMAC, Isosorbide-5-Nitrae-dioxane and acetone.
2) method that accelerating oxidation Graphene disperses is easy to realize, and is convenient to large-scale industrial production.
3) in the preparation method of described GO modification flat sheet membrane material, can change the aperture of film by the parameter such as composition, temperature and setting time of controlling coagulating bath in the content of addition, additive of content, GO of dispersant DMAC and film forming procedure, and then obtain the forward osmosis membrane of different porosities and different rejection. Fig. 3 is at one timing of DMAC content, the casting solution of different graphene oxide content.
4) graphene oxide dosage is low, under 0.15% the ratio that adds, just can play the good effect that improves membrane permeability and mechanical strength. Fig. 4 is the modification cellulose acetate forward osmosis membrane that the content of pure CTA film and graphene oxide is 0.15%.
5) fabric such as nonwoven or polyester screen is as supporting layer, and this class supporting layer mechanical performance is strong, and membrane porosity is higher.
6) film-forming process simple, under normal pressure, carry out, process is simple, be easy to realize..
7) graphene oxide add improved forward osmosis membrane surface hydrophily be difficult for absorption sewage in hydrophobic component as organic matter and microorganism, in use antifouling property is strong to make membrane material, even contaminated rear by simple physical cleaning or other modes flux of recovered part fast.
8) graphene oxide add the microstructure that there is no obviously to change cellulose acetate, retained original properties of materials. Fig. 5 is surface and the section structure of pure CTA forward osmosis membrane and graphene oxide modification forward osmosis membrane, has supporting layer and active layer to form.
Brief description of the drawings
Fig. 1 is graphene oxide infrared spectrogram.
Fig. 2 is the dispersiveness of graphene oxide in different solvents, is respectively from left to right: acetone; Isosorbide-5-Nitrae-dioxane; Acetone and Isosorbide-5-Nitrae-dioxane; DMAC; DMAC, acetone and Isosorbide-5-Nitrae-dioxane.
Fig. 3 is different content graphene oxide casting solution, is respectively from left to right: 0.02%GO; 0.05%GO; 0.10%GO; 0.15%GO; (e) 0.20%GO.
Fig. 4 is pure CTA forward osmosis membrane and graphene oxide forward osmosis membrane, (a) pure CTA forward osmosis membrane; (b) graphene oxide forward osmosis membrane.
Fig. 5 (a)-Fig. 5 (b) is the ESEM picture that pure CTA is just permeating flat sheet membrane surface and section; Fig. 5 (c)-Fig. 5 (d) is the ESEM picture that graphene oxide is just permeating flat sheet membrane surface and section; The graphene oxide forward osmosis membrane section picture of Fig. 5 (e) for amplifying.
Fig. 6 is laboratory scale forward osmosis membrane isolation technics flow chart, and wherein 1 is that material liquid, 2 is that peristaltic pump, 3 is that positive permeable membrane unit, 4 is online quality monitoring device for drawing liquid, 5.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1.
By 0.1% graphene oxide in 35% DMAC dispersed 1 hour, then by 35% 1,4-dioxane and 13% acetone, additive 3.8% methyl alcohol, 3.1% lactic acid once joins in dispersion liquid, finally adds 10% high molecular polymer Triafol T (CTA). In the water bath with thermostatic control of 50 DEG C, be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 50 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 70% with the manual knifing machine knifing of phase inversion, supporting layer be 150 order polyester screen, by scrape film in air, volatilize after 30s, put in 20 DEG C of deionized water coagulating baths, solidify 4h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide.
The feature of this flat sheet membrane is: adopt device as shown in Figure 6 to test, record pure water flux large and stable; Contact angle mean value is 48 degree, adds a small amount of GO can obviously strengthen the hydrophily on film surface; Film surfacing is even and intensity good, and porosity is large and rejection is high.
Embodiment 2
By 0.1% graphene oxide in 32% DMAC dispersed 1 hour, then by 32% 1,4-dioxane and 12.4% acetone, additive 6% methyl alcohol, 4.5% lactic acid once joins in dispersion liquid, finally adds 13% high molecular polymer cellulose acetate (CA). In the water bath with thermostatic control of 60 DEG C, be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 60 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 70% with the manual knifing machine knifing of phase inversion, supporting layer be 150 order polyester screen, by scrape film in air, volatilize after 30s, put in 20 DEG C of deionized water coagulating baths, solidify 4h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide.
The feature of this flat sheet membrane is: each component prescription is all that optimal proportion adds, not only good hydrophilic property of obtained flat sheet membrane, and contact angle mean value is that 51 degree, water flux are large, the stifled ability of anti-soil is strong.
Embodiment 3
By 0.1% graphene oxide in 32% DMAC dispersed 1 hour, then by 32% 1,4-dioxane and 12.4% acetone, additive 6% methyl alcohol, 4.5% lactic acid once joins in dispersion liquid, finally add the high molecular polymer cellulose acetate (CA) of 6.5% high molecular polymer Triafol T (CTA) and 6.5% in the water bath with thermostatic control of 60 DEG C, to be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 60 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 70% with the manual knifing machine knifing of phase inversion, supporting layer be 250 order polyester screen, by scrape film in air, volatilize after 30s, put in 20 DEG C of deionized water coagulating baths, solidify 4h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide.
The feature of this flat sheet membrane is: obtained flat sheet membrane good hydrophilic property, and contact angle mean value is 45 degree, mechanical performance is strong, porosity is higher.
Embodiment 4
Similar to embodiment 1:
By 0.05% graphene oxide in 30% DMAC dispersed 1 hour, then by 38.05% 1,4-dioxane and 12% acetone, additive 3.8% methyl alcohol, 3.1% lactic acid once joins in dispersion liquid, finally adds 14% high molecular polymer Triafol T (CTA). In the water bath with thermostatic control of 60 DEG C, be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 60 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 70% with the manual knifing machine knifing of phase inversion, supporting layer be nonwoven, by scrape film in air, volatilize after 30s, put in 20 DEG C of deionized water coagulating baths, solidify 4h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide
The feature of this flat sheet membrane is: obtained flat sheet membrane good hydrophilic property, contact angle mean value is 50 degree, water flux is large, rejection is large.
Embodiment 5
Similar to embodiment 1
By 0.15% graphene oxide in 35% DMAC dispersed 1 hour, then by 35.25% 1,4-dioxane and 13% acetone, additive 3.5% methyl alcohol, 3.1% lactic acid once joins in dispersion liquid, finally adds 10% high molecular polymer Triafol T (CTA). In the water bath with thermostatic control of 50 DEG C, be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 50 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 60% with the manual knifing machine knifing of phase inversion, supporting layer be 150 order polyester screen, by scrape film in air, volatilize after 50s, put in 20 DEG C of deionized water coagulating baths, solidify 5h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide.
The feature of this flat sheet membrane: obtained flat sheet membrane water flux is large, good hydrophilic property, contact angle mean value is 49 degree, hot strength is better.
Embodiment 6
Similar to embodiment 1
By 0.2% graphene oxide in 40% DMAC dispersed 1 hour, then by 30% 1,4-dioxane and 13% acetone, additive 3.5% methyl alcohol, 3.3% lactic acid once joins in dispersion liquid, finally adds 10% high molecular polymer Triafol T (CTA). In the water bath with thermostatic control of 50 DEG C, be stirred to completely and dissolve, in the vacuum drying chamber that puts it into 50 DEG C, (vacuum is 0.08MPa) is more than standing and defoaming 12h. Afterwards temperature be in 20 DEG C, the relative humidity environment that is 50% with the manual knifing machine knifing of phase inversion, supporting layer be 200 order polyester screen, by scrape film in air, volatilize after 20s, put in 20 DEG C of deionized water coagulating baths, solidify 6h. Film is separated with glass plate, newborn diaphragm is put in pure water and fully soaked 48h, can obtain the dull and stereotyped forward osmosis membrane of support type graphene oxide.
The feature of this flat sheet membrane: obtained flat sheet membrane water flux is large, good hydrophilic property, contact angle mean value is 44 degree. Average pore size between 0.5nm～1nm, hold back that efficiency is high, mechanical strength is large.
Embodiment 7
Select the forward osmosis membrane of water flux and salt rejection the best in above-mentioned example to process a certain dyeing waste water
Dyeing waste water index as shown in Table 1
Table one: dyeing waste water index
Waste water adopts the forward osmosis membrane in example after simple pretreatment, and the liquid that draws of film separation process adopts 2M sodium chloride solution.
Treatment effect: through continuous and steady operation 24h, forward osmosis membrane flux is at 24-18LMH. The removal effect of each leading indicator is as shown in the table:
Visible, the modification forward osmosis membrane making by method of the present invention has good hydrophily and water flux, and contamination resistance is strong, and the service life of film is used, greatly extended to the cleaning charge that reduces film, and mechanical performance improves a lot.
Claims (5)
1. a preparation method for graphene oxide modification forward osmosis membrane, is characterized in that comprising the steps:
(1) first by graphene oxide in strong polar organic solvent, under ultrasound condition, disperse 10～100 minutes, make evenly pointLoose liquid;
(2) organic solvent of masking raw material is joined in described dispersion liquid, stir and form the finely dispersed dispersion of graphene oxideLiquid;
(3) additive, masking are joined successively in the dispersion liquid that step (2) obtains, at the temperature of 40 DEG C～90 DEG C continuouslyStir above dissolving extremely completely in 6 hours, make the homodisperse casting solution of graphene oxide;
(4) described casting solution after abundant deaeration, is poured on the glass plate that is covered with supporting layer in vacuum drying chamber, uses knifing machineCarry out knifing;
(5) water film after casting solution in air, volatilize after 5～100 seconds, put into coagulating bath, coagulation bath temperature is 10 DEG C～60 DEG C;
(6) diaphragm is separated with glass plate, diaphragm is put in pure water and soaked more than 6 hours;
(7) after natural drying the film of above-mentioned abundant immersion, obtain forward osmosis membrane.
2. the preparation method of graphene oxide modification forward osmosis membrane according to claim 1, is characterized in that: described strong polarityOrganic solvent is dimethylacetylamide or dimethyl formamide; The organic solvent of described masking raw material is acetone, Isosorbide-5-Nitrae-dioxaneOr the mixture of the two; Described masking raw material is Triafol T, cellulose acetate or the mixture of the two; Described additiveFor lactic acid, methyl alcohol or the mixture of the two; Described supporting layer is nonwoven or polyester screen; Solidification liquid employing ultra-pure water, 10%～The aqueous solution of 30% alcoholic solution or 10%～30% organic solvent.
3. the preparation method of graphene oxide modification forward osmosis membrane according to claim 2, is characterized in that masking raw material is threeThe organic solvent of cellulose acetate, masking raw material is that acetone and Isosorbide-5-Nitrae-dioxane, additive are that lactic acid and methyl alcohol, strong polarity haveMachine solvent is dimethylacetylamide, and the percetage by weight of each component is as follows:
4. the preparation method of graphene oxide modification forward osmosis membrane according to claim 2, is characterized in that masking raw material is vinegarThe organic solvent of acid cellulose, masking raw material is that acetone, additive are lactic acid and methyl alcohol, polar organic solvent is dimethyl second by forceAcid amides, the percetage by weight of each component is as follows:
5. the preparation method of graphene oxide modification forward osmosis membrane according to claim 2, is characterized in that masking raw material is threeThe organic solvent of cellulose acetate and cellulose acetate, masking raw material is that acetone and Isosorbide-5-Nitrae-dioxane, additive are lactic acid and firstAlcohol, strong polar organic solvent are dimethylacetylamide, and the percetage by weight of each component is as follows:
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| CN105921034A (en) * | 2016-06-21 | 2016-09-07 | 北京林业大学 | Preparation and application of graphene oxide-modified cellulose acetate forward osmosis membrane |
| CN109012181A (en) * | 2018-09-13 | 2018-12-18 | 青岛科技大学 | A kind of synthetic method and gained permeable membrane of the modified Cellulose acetate forward osmotic membrane of ZIF-8 |
| CN109110878A (en) * | 2018-09-09 | 2019-01-01 | 中国海洋大学 | A method of improving compound forward osmosis membrane water flux |
| CN109529623A (en) * | 2018-10-31 | 2019-03-29 | 中国科学院重庆绿色智能技术研究院 | A kind of high-intensity high-throughput antibacterial forward osmosis membrane of no fabric and preparation method thereof |
| CN112408377A (en) * | 2020-12-01 | 2021-02-26 | 江苏星途新材料科技有限公司 | Porous modified graphene oxide membrane and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921034A (en) * | 2016-06-21 | 2016-09-07 | 北京林业大学 | Preparation and application of graphene oxide-modified cellulose acetate forward osmosis membrane |
| CN109110878A (en) * | 2018-09-09 | 2019-01-01 | 中国海洋大学 | A method of improving compound forward osmosis membrane water flux |
| CN109110878B (en) * | 2018-09-09 | 2021-11-05 | 中国海洋大学 | Method for improving water flux of composite forward osmosis membrane |
| CN109012181A (en) * | 2018-09-13 | 2018-12-18 | 青岛科技大学 | A kind of synthetic method and gained permeable membrane of the modified Cellulose acetate forward osmotic membrane of ZIF-8 |
| CN109529623A (en) * | 2018-10-31 | 2019-03-29 | 中国科学院重庆绿色智能技术研究院 | A kind of high-intensity high-throughput antibacterial forward osmosis membrane of no fabric and preparation method thereof |
| CN112408377A (en) * | 2020-12-01 | 2021-02-26 | 江苏星途新材料科技有限公司 | Porous modified graphene oxide membrane and preparation method thereof |
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