CN110548426B - Coating process of ultrafiltration membrane - Google Patents
Coating process of ultrafiltration membrane Download PDFInfo
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- CN110548426B CN110548426B CN201910802395.XA CN201910802395A CN110548426B CN 110548426 B CN110548426 B CN 110548426B CN 201910802395 A CN201910802395 A CN 201910802395A CN 110548426 B CN110548426 B CN 110548426B
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- ultrafiltration membrane
- coating
- deionized water
- modified chitosan
- maleic anhydride
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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
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0093—Chemical modification
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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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- 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
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/82—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a coating process of an ultrafiltration membrane, which comprises the steps of preparing modified chitosan, performing precoating modification on the ultrafiltration membrane by using an aqueous solution of the modified chitosan, placing the precoated modified ultrafiltration membrane in a surfactant for grafting modification, activating and grafting by using ultraviolet irradiation, and washing and drying to obtain the ultrafiltration membrane.
Description
Technical Field
The invention relates to the technical field of sewage treatment equipment, in particular to a coating process of an ultrafiltration membrane.
Background
The filtration of the ultrafiltration membrane is far away from the mechanical screening of the fused particles passing through the membrane surface, the traditional ultrafiltration membrane can only filter and screen macromolecular particles from a few nanometers to dozens of nanometers, and heavy metal ions cannot be effectively screened.
At present, functional groups with a heavy metal ion adsorption function are grafted on the surface of an ultrafiltration membrane which is common and has a heavy metal ion filtration function, the preparation method is relatively complex, the prepared ultrafiltration membrane with the heavy metal ion adsorption function has more limitations on other functions, the preparation cost is high, and the commercial application value is low.
Disclosure of Invention
In view of the above, the invention provides a coating process of an ultrafiltration membrane, which is simple in method and lower in cost.
The technical scheme of the invention is realized as follows: the invention provides a coating process of an ultrafiltration membrane, which comprises the following steps:
step one, adding modified chitosan into deionized water, and enabling the deionized water containing the modified chitosan to pass through an ultrafiltration membrane to obtain a precoated ultrafiltration membrane;
step two, placing the precoated ultrafiltration membrane into a surfactant for soaking for 1-2min, and keeping ultraviolet illumination for 5-10min under the soaking condition to obtain a pretreated ultrafiltration membrane;
and step three, placing the pretreated ultrafiltration membrane in a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
On the basis of the technical scheme, preferably, the preparation method of the modified chitosan comprises the following steps: heating maleic anhydride to a molten state, adding chitosan into the molten maleic anhydride, keeping the temperature, stirring, reacting for 5-10min, and cooling to normal temperature to obtain the modified chitosan.
On the basis of the above technical scheme, preferably, the ratio of maleic anhydride: the mass ratio of the chitosan is (2-5): 1.
on the basis of the technical scheme, the temperature for heating the maleic anhydride is preferably 60-65 ℃.
More preferably, in the first step, the pressure of the deionized water containing the modified chitosan is 0.2-0.4MPa when the deionized water is passed through the ultrafiltration membrane.
On the basis of the above technical solution, preferably, in the step one, the deionized water: the mass ratio of the modified chitosan is (20-40): 1.
on the basis of the technical scheme, preferably, the surfactant is one of monolauryl phosphate, potassium lauryl alcohol ether phosphate and coconut monoethanolamide.
Based on the above technical solution, preferably, in the second step, the irradiation intensity of the ultraviolet light is 500-1000W/m 2.
On the basis of the technical scheme, preferably, the ultrafiltration membrane is a polysulfone ultrafiltration membrane or a polyethersulfone ultrafiltration membrane.
Based on the technical scheme, preferably, 25-50ml of modified chitosan solution is required for each square centimeter of ultrafiltration membrane.
Compared with the prior art, the coating process of the ultrafiltration membrane has the following beneficial effects:
(1) the ultrafiltration membrane coating process modifies the ultrafiltration membrane, membrane pores and the surface of the ultrafiltration membrane are pre-coated by the modified chitosan, so that the adsorption performance of heavy metal ions is enhanced, meanwhile, the surface of the ultrafiltration membrane is modified again by adopting the surface modifier, so that the hydrophilic performance of the ultrafiltration membrane is enhanced, the water flux and the anti-pollution capacity are improved, the grafting strength of the pre-coating modification is enhanced, and the grafting is more stable by ultraviolet irradiation under the grafting and soaking conditions;
(2) the ultrafiltration membrane treated by the ultrafiltration membrane coating process disclosed by the invention reserves the strength of a conventional ultrafiltration membrane substrate, has higher water flux and heavy metal ion absorption performance, and has a good application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Weighing 100g of maleic anhydride, heating to 60 ℃, enabling the maleic anhydride to enter a molten state, adding 50g of chitosan into the molten maleic anhydride, keeping the temperature, stirring for 5min, and cooling to normal temperature to obtain modified chitosan;
adding 25g modified chitosan into 500ml deionized water, stirring for dissolving to obtain modified chitosan solution, and allowing the chitosan solution to permeate 20cm under 0.2Mpa2Obtaining a precoated ultrafiltration membrane by using a polysulfone ultrafiltration membrane;
placing the precoated ultrafiltration membrane in monolauryl phosphate, soaking for 1min, and placing at 500W/m2Irradiating for 5min under ultraviolet light to obtain a pretreated ultrafiltration membrane;
and (3) placing the pretreated ultrafiltration membrane into a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
Example 2
Weighing 100g of maleic anhydride, heating to 65 ℃, enabling the maleic anhydride to enter a molten state, adding 20g of chitosan into the molten maleic anhydride, keeping the temperature, stirring for 10min, and cooling to normal temperature to obtain modified chitosan;
adding 25g modified chitosan into 1000ml deionized water, stirring to dissolve to obtain modified chitosan solution, and pressurizing at 0.4MpaPassing chitosan solution through 20cm2Polyether sulfone ultrafiltration membrane to obtain precoated ultrafiltration membrane;
placing the precoated ultrafiltration membrane in potassium monododecyl phosphate, soaking for 2min, and placing at 1000W/m2Irradiating for 10min under ultraviolet light to obtain a pretreated ultrafiltration membrane;
and (3) placing the pretreated ultrafiltration membrane into a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
Example 3
Weighing 100g of maleic anhydride, heating to 62 ℃, enabling the maleic anhydride to enter a molten state, adding 33g of chitosan into the molten maleic anhydride, keeping the temperature, stirring for 7min, and cooling to normal temperature to obtain modified chitosan;
adding 20g modified chitosan into 600ml deionized water, stirring for dissolving to obtain modified chitosan solution, and allowing the chitosan solution to permeate 20cm under 0.3Mpa2Obtaining a precoated ultrafiltration membrane by using a polysulfone ultrafiltration membrane;
placing the precoated ultrafiltration membrane in potassium lauryl ether phosphate, soaking for 1.5min, and placing at 600W/m2Irradiating for 7min under ultraviolet light to obtain a pretreated ultrafiltration membrane;
and (3) placing the pretreated ultrafiltration membrane into a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
Example 4
Weighing 100g of maleic anhydride, heating to 64 ℃, enabling the maleic anhydride to enter a molten state, adding 25g of chitosan into the molten maleic anhydride, keeping the temperature, stirring for 8min, and cooling to normal temperature to obtain modified chitosan;
adding 23g modified chitosan into 800ml deionized water, stirring for dissolving to obtain modified chitosan solution, and allowing the chitosan solution to permeate 20cm under 0.4Mpa2Polyether sulfone ultrafiltration membrane to obtain precoated ultrafiltration membrane;
placing the precoated ultrafiltration membrane in coconut oil acid monoethanolamide, soaking for 2min, and placing at 800W/m2Ultraviolet light irradiation ofInjecting for 9min to obtain a pretreated ultrafiltration membrane;
and (3) placing the pretreated ultrafiltration membrane into a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
The ultrafiltration membranes modified by the coatings prepared in the examples 1 to 4 and a certain commercially available polysulfone ultrafiltration membrane as a comparative example were used for filtering the potassium permanganate solution, respectively calculating the concentration of manganese ions in the solution before and after the filtration, and calculating the removal rate of the manganese ions, and the specific results were as follows:
the data show that the ultrafiltration membrane treated by the coating process has better interception performance on heavy metal ions than a common ultrafiltration membrane, can remove granular impurities in sewage, can adsorb a part of heavy metal ions, and has better decontamination effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A coating process of an ultrafiltration membrane is characterized by comprising the following steps:
step one, adding modified chitosan into deionized water, and enabling the deionized water containing the modified chitosan to pass through an ultrafiltration membrane to obtain a precoated ultrafiltration membrane, wherein the preparation method of the modified chitosan comprises the following steps: heating maleic anhydride to a molten state, heating the temperature of the maleic anhydride to 60-65 ℃, adding chitosan into the molten maleic anhydride, keeping the temperature, stirring and reacting for 5-10min, and cooling to normal temperature to obtain modified chitosan, wherein the mass ratio of the maleic anhydride: the mass ratio of the chitosan is (2-5): 1;
step two, placing the precoated ultrafiltration membrane into a surfactant for soaking for 1-2min, and keeping ultraviolet illumination for 5-10min under the soaking condition to obtain a pretreated ultrafiltration membrane;
and step three, placing the pretreated ultrafiltration membrane in a deionized water tank, performing back washing and forward washing on the ultrafiltration membrane by using deionized water, and drying to obtain the ultrafiltration membrane with the surface coating after washing.
2. The process of coating an ultrafiltration membrane of claim 1, wherein in step one, the deionized water containing the modified chitosan is passed through the ultrafiltration membrane at a pressure of 0.2 to 0.4 Mpa.
3. The process for coating an ultrafiltration membrane according to claim 1, wherein in step one, the deionized water: the mass ratio of the modified chitosan is (20-40): 1.
4. the process for coating an ultrafiltration membrane according to claim 1, wherein said surfactant is one of monolauryl phosphate, potassium laureth phosphate and coconut monoethanolamide.
5. The process for coating the ultrafiltration membrane according to claim 1, wherein in the second step, the irradiation intensity of the ultraviolet light is 500-1000W/m2。
6. The process for coating an ultrafiltration membrane according to claim 1, wherein said ultrafiltration membrane is a polysulfone ultrafiltration membrane or a polyethersulfone ultrafiltration membrane.
7. The process for coating an ultrafiltration membrane of claim 1, wherein 25 to 50ml of the modified chitosan solution is required per square centimeter of the ultrafiltration membrane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910802395.XA CN110548426B (en) | 2019-08-28 | 2019-08-28 | Coating process of ultrafiltration membrane |
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| CN201910802395.XA CN110548426B (en) | 2019-08-28 | 2019-08-28 | Coating process of ultrafiltration membrane |
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| CN110548426B true CN110548426B (en) | 2022-04-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101536709A (en) * | 2009-03-17 | 2009-09-23 | 贵州大学 | Chitosan composite coating preservative and preparation method thereof |
| CN101804307A (en) * | 2010-04-29 | 2010-08-18 | 江苏朗生生命科技有限公司 | Anti-coagulation composite ultrafiltration membrane and preparation method thereof |
| CN201669064U (en) * | 2010-04-29 | 2010-12-15 | 江苏朗生生命科技有限公司 | Anti-coagulation composite ultrafiltration membrane |
| CN102688696A (en) * | 2012-05-25 | 2012-09-26 | 西安理工大学 | Method for preparing modified supported liquid membrane |
| CN104667768A (en) * | 2013-11-29 | 2015-06-03 | 贵阳时代沃顿科技有限公司 | Preparation method for novel anti-pollution polysulfone flat plate ultrafiltration membrane |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201211309D0 (en) * | 2012-06-26 | 2012-08-08 | Fujifilm Mfg Europe Bv | Process for preparing membranes |
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- 2019-08-28 CN CN201910802395.XA patent/CN110548426B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101536709A (en) * | 2009-03-17 | 2009-09-23 | 贵州大学 | Chitosan composite coating preservative and preparation method thereof |
| CN101804307A (en) * | 2010-04-29 | 2010-08-18 | 江苏朗生生命科技有限公司 | Anti-coagulation composite ultrafiltration membrane and preparation method thereof |
| CN201669064U (en) * | 2010-04-29 | 2010-12-15 | 江苏朗生生命科技有限公司 | Anti-coagulation composite ultrafiltration membrane |
| CN102688696A (en) * | 2012-05-25 | 2012-09-26 | 西安理工大学 | Method for preparing modified supported liquid membrane |
| CN104667768A (en) * | 2013-11-29 | 2015-06-03 | 贵阳时代沃顿科技有限公司 | Preparation method for novel anti-pollution polysulfone flat plate ultrafiltration membrane |
Non-Patent Citations (1)
| Title |
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| 表面活性剂对超滤膜表面改性的研究;陆晓峰 等;《膜科学与技术》;19970831;第17卷(第4期);第36-41页 * |
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