CN114425244A - Preparation method and application of modified super-hydrophobic membrane based on polytetrafluoroethylene - Google Patents
Preparation method and application of modified super-hydrophobic membrane based on polytetrafluoroethylene Download PDFInfo
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- CN114425244A CN114425244A CN202210056902.1A CN202210056902A CN114425244A CN 114425244 A CN114425244 A CN 114425244A CN 202210056902 A CN202210056902 A CN 202210056902A CN 114425244 A CN114425244 A CN 114425244A
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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
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
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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
- B01D67/0002—Organic membrane manufacture
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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
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/38—Hydrophobic membranes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a preparation method of a modified super-hydrophobic membrane based on polytetrafluoroethylene, which belongs to the technical field of membrane surface modification.
Description
Technical Field
The invention relates to the technical field of membrane surface modification, in particular to a preparation method and application of a modified super-hydrophobic membrane based on polytetrafluoroethylene.
Background
The membrane distillation is a membrane separation process which takes a hydrophobic membrane material as a separation medium and takes the pressure difference of steam as a driving force. Different from reverse osmosis desalination, the membrane distillation process has phase change and high energy consumption. Therefore, the method is generally applied to the field that reverse osmosis cannot be applied and the treatment capacity is relatively small, and has potential application prospects in the directions of industrial sewage zero discharge, deep concentration of strong brine, movable small-sized purified water preparation and the like.
Taking coal chemical industry as an example, sewage containing various organic matters and a large amount of salt needs to be subjected to complex pretreatment including flocculation, oxidation, precipitation, membrane filtration and concentration (such as ultra-microfiltration and reverse osmosis), the salt content of the formed strong brine reaches 50000-. Compared with the existing concentration technology (such as natural evaporation, mechanical compression evaporation and multi-effect evaporation), the membrane distillation equipment has the advantages of relatively low cost, low operation pressure and temperature, mild operation condition and high water quality of produced water. If solar energy, waste heat and the like can be used as heat sources for distillation treatment, the distillation treatment device has strong competitive advantages. Membrane distillation can also be used as a core component of mobile water treatment equipment to provide a clean water source for many fresh water-deficient areas. However, in the membrane distillation process, when a complex water system is treated, the pollution, the scale formation and the wetting of the hydrophobic membrane material can cause the distillation process to be unstable, so that the hydrophobic stability and the pollution resistance of the membrane material are very important for the stable operation of the membrane distillation in the membrane distillation process.
Due to certain price advantage, the modified PVDF (polyvinylidene fluoride) membrane is mostly used as a hydrophobic membrane in the prior art, although the pollution resistance and the salt tolerance of the modified PVDF membrane are better than those of a PVDF original membrane, the hydrophobic stability and the durability of the modified PVDF membrane are required to be enhanced, and the flux is reduced, so that the efficiency of distilled water production is reduced.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method and application of a modified super-hydrophobic membrane based on polytetrafluoroethylene.
The purpose of the invention is realized by adopting the following technical scheme:
a preparation method of a modified super-hydrophobic membrane based on polytetrafluoroethylene comprises the following steps:
s1, pre-wetting a hydrophobic polytetrafluoroethylene filter membrane with ethanol, immersing the hydrophobic polytetrafluoroethylene filter membrane into a hot mixed aqueous solution of sodium hydroxide and dodecyl dimethyl benzyl ammonium chloride, and washing the hydrophobic polytetrafluoroethylene filter membrane with deionized water after heat preservation and immersion are finished to obtain a first modified filter membrane;
s2, immersing the first modified filter membrane into an ethanol solution of gamma-aminopropyl triethoxysilane to obtain a second modified filter membrane;
s3, immersing the second modified filter membrane into an acidic buffer solution in which silicon dioxide particles are dispersed to obtain a third modified filter membrane;
s4, immersing the third modified filter membrane into an ethanol solution of (1H,1H,2H,2H-) perfluorodecyl triethoxysilane, and drying after immersion to obtain the modified super-hydrophobic membrane.
In some preferred embodiments, the hydrophobic polytetrafluoroethylene filter has a pore size of 0.1 μm.
In some preferred embodiments, the temperature of the soaking in the heat preservation of step S1 is 60 ℃, and the soaking time is 3 h.
In some preferred embodiments, the mass ratio of the sodium hydroxide to the dodecyl dimethyl benzyl ammonium chloride in the mixed aqueous solution of step S1 is 5:1, and the total concentration is 6 mg/mL.
In some preferred embodiments, the volume ratio of γ -aminopropyltriethoxysilane to ethanol in step S2 is 1: 100.
In some preferred embodiments, the acidic buffer solution in step S3 is an acetate buffer solution with pH 4, and the silica particles are dispersed in an amount of 0.05 wt.%.
In some preferred embodiments, the volume ratio of (1H,1H,2H,2H-) perfluorodecyltriethoxysilane to ethanol in step S4 is 1: 100.
The second purpose of the invention is to provide a modified super-hydrophobic membrane based on polytetrafluoroethylene, and the modified super-hydrophobic membrane is prepared by the preparation method.
The invention also aims to provide application of the modified super-hydrophobic membrane, in particular to application in membrane distillation.
The invention has the beneficial effects that:
aiming at the problem that the stability and the flux caused by the modification of a basement membrane are difficult to be considered in the prior art, the invention provides a modified super-hydrophobic membrane based on polytetrafluoroethylene, the modification improves the hydrophobicity of a PTFE membrane, and simultaneously the flux is not reduced or even improved, in particular, the invention takes a hydrophobic polytetrafluoroethylene filter membrane as a substrate, the hydrophobic polytetrafluoroethylene filter membrane is treated by NaOH-DDBAC mixed solution, then surface amino is introduced by a silane coupling agent, then silicon dioxide to be negatively charged is introduced by dipping under the acidic condition by utilizing the electrostatic action, and finally the hydrophobic polytetrafluoroethylene filter membrane is treated by fluorosilane and dried to obtain the modified PTFE membrane, the modified PTFE membrane is subjected to membrane distillation circulation tests of three different salinity, still keeps better salt resistance without being wetted, and the anti-pollution property and the salt resistance of the modified PTFE membrane are better improved compared with those of the PTFE membrane, and the modified PTFE membrane has good tolerance to salt solutions with different concentrations, the membrane flux is greatly improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a graph of the interaction force of a water droplet with a PTFF film;
FIG. 2 shows a water droplet and F-SiO2Graph of @ PTFE membrane interaction force;
FIG. 3 is a diagram of water in a PTFF film and F-SiO2Comparative contact angle plot on @ PTFE membrane;
FIG. 4 is a diagram of water in a PTFF film and F-SiO2Rolling contrast plot on @ PTFE membrane;
FIG. 5 is a schematic structural view of a membrane distillation apparatus according to an experimental example;
FIG. 6 shows a PTFE film and F-SiO2@ PTFE membrane flux was plotted as a function of time for 1.5 wt.%, 3.5 wt.%, 5.5 wt.% NaCl solution flux on the hot water side, respectively.
Detailed Description
The invention is further described with reference to the following examples.
The embodiment of the invention relates to a modified super-hydrophobic membrane, and the preparation method comprises the following steps:
(1) completely pre-wetting a dried hydrophobic PTFE membrane by using ethanol, then soaking the dried hydrophobic PTFE membrane into a mixed solution of NaOH and DDBAC (dodecyl dimethyl benzyl ammonium chloride), putting the dried hydrophobic PTFE membrane and the mixed solution into an oven, soaking the dried hydrophobic PTFE membrane and the DDBAC (dodecyl dimethyl benzyl ammonium chloride) for 3 hours at the temperature of 60 ℃, filtering and washing the membrane by using deionized water to obtain an alkaline-treated PTFE membrane;
the concentrations of NaOH and DDBAC in the mixed solution are respectively 5mg/mL and 1 mg/mL;
(2) soaking the PTFE membrane obtained in the step (1) in an APTES (gamma-aminopropyltriethoxysilane) -ethanol solution of 1% (v/v) for 1h to introduce terminal amine groups and positive charges on the surface of the membrane;
(3) immersing the positively charged PTFE film obtained in (2) in SiO dispersed particles2Soaking the particles in acetate buffer solution (pH 4) for 2.5h to obtain SiO2@ PTFE film;
the content of acetic acid in the buffer solution is 0.0375mL/L, SiO2The content of the particles is 0.5 g/L;
(4) SiO prepared in the step (3)2@ PTFE membrane is immersed in 1% (v/v) of (1H,1H,2H,2H-) perfluorodecyl triethoxysilane-ethanol solution for 10min, and is taken out and dried in vacuum at 120 ℃ for 20min to prepare the modified super-hydrophobic membrane (marked as F-SiO)2@PTFE)。
Examples of the experiments
1. Using unmodified PTEF film as comparison, measuring water drop, PTEF film and F-SiO2@ PTFE membrane interaction force, see FIGS. 1-2;
2. using unmodified PTEF membrane as comparison, and measuring water in PTEF membrane and F-SiO2The contact angle and the rolling property of the @ PTFE film are determined according to attached figures 3-4;
3. taking unmodified PTEF membrane as comparison, continuously testing in a membrane distillation device, and determining PTFE membrane and F-SiO with the structural schematic diagram of the membrane distillation device referring to figure 52The flux of the @ PTFE film was varied for NaCl solutions of different concentrations on the hot water side (pure water on the cold water side), and the results of the measurement were shown in FIG. 6.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A preparation method of a modified super-hydrophobic membrane based on polytetrafluoroethylene is characterized by comprising the following steps:
s1, pre-wetting a hydrophobic polytetrafluoroethylene filter membrane with ethanol, immersing the hydrophobic polytetrafluoroethylene filter membrane into a hot mixed aqueous solution of sodium hydroxide and dodecyl dimethyl benzyl ammonium chloride, and washing the hydrophobic polytetrafluoroethylene filter membrane with deionized water after heat preservation and immersion are finished to obtain a first modified filter membrane;
s2, immersing the first modified filter membrane into an ethanol solution of gamma-aminopropyl triethoxysilane to obtain a second modified filter membrane;
s3, immersing the second modified filter membrane into an acidic buffer solution in which silicon dioxide particles are dispersed to obtain a third modified filter membrane;
s4, immersing the third modified filter membrane into an ethanol solution of (1H,1H,2H,2H-) perfluorodecyl triethoxysilane, and drying after immersion to obtain the modified super-hydrophobic membrane.
2. The method for preparing a modified superhydrophobic polytetrafluoroethylene-based membrane according to claim 1, wherein the pore size of said hydrophobic polytetrafluoroethylene filter membrane is 0.1 μm.
3. The method for preparing a modified superhydrophobic film based on polytetrafluoroethylene according to claim 1, wherein the soaking temperature in the heat preservation soaking step S1 is 60 ℃, and the soaking time is 3 hours.
4. The method for preparing a polytetrafluoroethylene-based modified superhydrophobic film according to claim 1, wherein the mass ratio of sodium hydroxide to dodecyldimethylbenzylammonium chloride in the mixed aqueous solution of step S1 is 5:1, and the total concentration is 6 mg/mL.
5. The method for preparing a modified superhydrophobic film based on polytetrafluoroethylene according to claim 1, wherein a volume ratio of gamma-aminopropyltriethoxysilane to ethanol in step S2 is 1: 100.
6. The method for preparing a polytetrafluoroethylene-based modified superhydrophobic film according to claim 1, wherein the acidic buffer solution in step S3 is an acetate buffer solution with pH 4, and the dispersion amount of silica particles is 0.05 wt.%.
7. The method of claim 1, wherein the volume ratio of (1H,1H,2H,2H-) perfluorodecyltriethoxysilane to ethanol in step S4 is 1: 100.
8. Modified superhydrophobic polytetrafluoroethylene-based membrane prepared according to the preparation process defined in any one of claims 1-7.
9. Use of the modified superhydrophobic membrane of claim 8 in membrane distillation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891258A (en) * | 2022-05-24 | 2022-08-12 | 东北电力大学 | Preparation method of film with firm interface crosslinking layer on surface |
| CN115364700A (en) * | 2022-08-02 | 2022-11-22 | 广州大学 | Polyvinylidene fluoride-based modified super-hydrophobic membrane, and preparation method and application thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387690A (en) * | 2012-05-09 | 2013-11-13 | 中国科学院大连化学物理研究所 | Preparation method of cross-linking type composite anion-exchange membrane |
| WO2015084266A1 (en) * | 2013-12-05 | 2015-06-11 | Nanyang Technological University | A composite nanofiber membrane for membrane distillation and a method of fabrication thereof |
| CN105413488A (en) * | 2015-12-11 | 2016-03-23 | 上海交通大学 | Preparation method and application of super-hydrophobic membrane |
| CN106390764A (en) * | 2015-07-28 | 2017-02-15 | 北京工业大学 | Superhydrophobic oleophobic modification method of porous membrane |
| CN109011919A (en) * | 2018-08-21 | 2018-12-18 | 安徽工业大学 | A kind of improved silica Nano sol solution and the micropore film filtering material for high humidity clarifying smoke and preparation method thereof |
| CN109939573A (en) * | 2017-12-20 | 2019-06-28 | 扬州中福生物技术有限公司 | The hydrophobically modified method of PTFE filter membrane |
| WO2019155446A1 (en) * | 2018-02-12 | 2019-08-15 | Ypf Tecnología S.A. | Method of preparation of new super-hydrophobic membranes and membranes obtained by said method |
| CN111635258A (en) * | 2020-05-08 | 2020-09-08 | 北京林业大学 | TiO based on ceramic film2Super-hydrophobic modification method |
| CN113230911A (en) * | 2021-05-25 | 2021-08-10 | 浙江工业大学 | Preparation method of amphiphobic polytetrafluoroethylene membrane |
| CN113318617A (en) * | 2021-04-15 | 2021-08-31 | 中山大学 | Crystallization-resistant hydrophobic modified membrane and preparation method and application thereof |
| CN113457474A (en) * | 2021-06-30 | 2021-10-01 | 苏州大学 | Nanofiber membrane material, preparation method and application thereof |
-
2022
- 2022-01-18 CN CN202210056902.1A patent/CN114425244B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387690A (en) * | 2012-05-09 | 2013-11-13 | 中国科学院大连化学物理研究所 | Preparation method of cross-linking type composite anion-exchange membrane |
| WO2015084266A1 (en) * | 2013-12-05 | 2015-06-11 | Nanyang Technological University | A composite nanofiber membrane for membrane distillation and a method of fabrication thereof |
| CN106390764A (en) * | 2015-07-28 | 2017-02-15 | 北京工业大学 | Superhydrophobic oleophobic modification method of porous membrane |
| CN105413488A (en) * | 2015-12-11 | 2016-03-23 | 上海交通大学 | Preparation method and application of super-hydrophobic membrane |
| CN109939573A (en) * | 2017-12-20 | 2019-06-28 | 扬州中福生物技术有限公司 | The hydrophobically modified method of PTFE filter membrane |
| WO2019155446A1 (en) * | 2018-02-12 | 2019-08-15 | Ypf Tecnología S.A. | Method of preparation of new super-hydrophobic membranes and membranes obtained by said method |
| CN109011919A (en) * | 2018-08-21 | 2018-12-18 | 安徽工业大学 | A kind of improved silica Nano sol solution and the micropore film filtering material for high humidity clarifying smoke and preparation method thereof |
| CN111635258A (en) * | 2020-05-08 | 2020-09-08 | 北京林业大学 | TiO based on ceramic film2Super-hydrophobic modification method |
| CN113318617A (en) * | 2021-04-15 | 2021-08-31 | 中山大学 | Crystallization-resistant hydrophobic modified membrane and preparation method and application thereof |
| CN113230911A (en) * | 2021-05-25 | 2021-08-10 | 浙江工业大学 | Preparation method of amphiphobic polytetrafluoroethylene membrane |
| CN113457474A (en) * | 2021-06-30 | 2021-10-01 | 苏州大学 | Nanofiber membrane material, preparation method and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| EUN JI PARK,ET AL: "Fabrication of a superhydrophobic and oleophobic PTFE membrane_ An application to selective gas permeation", 《MATERIALS RESEARCH BULLETIN》 * |
| WEI ZHANG,ET AL: "Preparation of re-entrant and anti-fouling PVDF composite membrane with omniphobicity for membrane distillation", 《JOURNAL OF MEMBRANE SCIENCE》 * |
| 车振宁 等: "基于全氟硅烷/烷基SiO2协同效应的PTFE中空纤维膜表面超疏水改性研究", 《塑料工业》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891258A (en) * | 2022-05-24 | 2022-08-12 | 东北电力大学 | Preparation method of film with firm interface crosslinking layer on surface |
| CN115364700A (en) * | 2022-08-02 | 2022-11-22 | 广州大学 | Polyvinylidene fluoride-based modified super-hydrophobic membrane, and preparation method and application thereof |
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