CN111530504A - Photocatalytic sewage treatment membrane and preparation method thereof - Google Patents
Photocatalytic sewage treatment membrane and preparation method thereof Download PDFInfo
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- CN111530504A CN111530504A CN202010392170.4A CN202010392170A CN111530504A CN 111530504 A CN111530504 A CN 111530504A CN 202010392170 A CN202010392170 A CN 202010392170A CN 111530504 A CN111530504 A CN 111530504A
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- 239000012528 membrane Substances 0.000 title claims abstract description 77
- 239000010865 sewage Substances 0.000 title claims abstract description 42
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000008367 deionised water Substances 0.000 claims abstract description 51
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 51
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000005266 casting Methods 0.000 claims abstract description 39
- 239000002033 PVDF binder Substances 0.000 claims abstract description 27
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 27
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims abstract description 26
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000002791 soaking Methods 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 238000007790 scraping Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 72
- 239000000243 solution Substances 0.000 claims description 67
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 36
- 239000004408 titanium dioxide Substances 0.000 claims description 36
- 239000011259 mixed solution Substances 0.000 claims description 30
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 29
- 229910017604 nitric acid Inorganic materials 0.000 claims description 29
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 claims description 28
- 238000004140 cleaning Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 abstract description 28
- 238000002156 mixing Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000614 phase inversion technique Methods 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B01J35/39—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
-
- B01J35/30—
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention relates to the field of sewage treatment, and particularly discloses a photocatalytic sewage treatment membrane and a preparation method thereof. Mixing 30-40 parts by mass of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts by mass of N, N-dimethylformamide, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane. The photocatalytic sewage treatment membrane prepared by the invention has the advantages of good treatment effect, simple process, low energy consumption, less investment, small occupied area, high automation degree, no secondary pollution and the like.
Description
Technical Field
The invention relates to the field of sewage treatment, and particularly discloses a photocatalytic sewage treatment membrane and a preparation method thereof.
Background
The photocatalysis sewage treatment method has the advantages of high catalytic activity, good stability, low price, no harm to human bodies and the like, and is widely applied to the fields of recycling of various process wastewater and municipal sewage, seawater desalination and the like. However, most of research is limited to a photocatalyst dispersion suspension system, and the system has the problem that the catalyst is difficult to separate and recover, so that the catalyst is easy to poison and agglomerate, secondary pollution of water is caused, and the large-scale application of a photocatalytic process in water treatment is seriously hindered.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a photocatalytic sewage treatment membrane and a preparation method thereof.
A photocatalytic sewage treatment membrane comprises, by mass, 40-50 parts of absolute ethyl alcohol, 10-15 parts of deionized water, 30-50 parts of tetraethyl titanate, 5-8 parts of concentrated nitric acid, 30-40 parts of a polyvinylidene fluoride solution and 100 parts of N, N-dimethylformamide.
In order to achieve the purpose, the preparation method of the photocatalytic sewage treatment membrane adopts the following steps:
firstly, adding 40-50 parts by mass of absolute ethyl alcohol and 10-15 parts by mass of deionized water into a high-pressure reaction kettle, then adding 30-50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5-8 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
mixing 30-40 parts by mass of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts by mass of N, N-dimethylformamide, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Compared with the prior art, the photocatalytic sewage treatment membrane prepared by the invention has the advantages of good treatment effect, simple process, low energy consumption, less investment, small occupied area, high degree of automation, no secondary pollution and the like; the photocatalytic film prepared by adopting a phase inversion method is a composite film, and has longer service life than a film with a single component; the photocatalysis sewage treatment membrane has wide application in the fields of recycling of various process wastewater and municipal sewage, seawater desalination and the like.
Detailed Description
In order to facilitate the understanding of those skilled in the art, the present invention will be further described with reference to the following examples, which are not intended to limit the scope of the present invention.
Example 1
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 40 parts of absolute ethyl alcohol and 10 parts of deionized water into a high-pressure reaction kettle according to the mass parts, then adding 30 parts of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
mixing 30 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 2
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 50 parts by mass of absolute ethyl alcohol and 15 parts by mass of deionized water into a high-pressure reaction kettle, then adding 50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
mixing 30 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 3
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 42 parts of absolute ethyl alcohol and 15 parts of deionized water into a high-pressure reaction kettle according to the mass parts, then adding 50 parts of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
mixing 30 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 4
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 50 parts by mass of absolute ethyl alcohol and 15 parts by mass of deionized water into a high-pressure reaction kettle, then adding 50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, taking 8 parts by mass of concentrated nitric acid, slowly adding the concentrated nitric acid into the mixed solution, reacting the mixed solution in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixed solution to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
mixing 30 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 5
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 50 parts by mass of absolute ethyl alcohol and 10 parts by mass of deionized water into a high-pressure reaction kettle, then adding 30-50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, taking 8 parts by mass of concentrated nitric acid, slowly adding the concentrated nitric acid into the mixed solution, reacting the mixed solution in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixed solution to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 33 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 6
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 45 parts of absolute ethyl alcohol and 10 parts of deionized water into a high-pressure reaction kettle according to the mass parts, then adding 30 parts of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 6 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 40 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 7
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 50 parts by mass of absolute ethyl alcohol and 15 parts by mass of deionized water into a high-pressure reaction kettle, then adding 30-50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 38 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 8
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 44 parts by mass of absolute ethyl alcohol and 14 parts by mass of deionized water into a high-pressure reaction kettle, then adding 30-50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 38 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 9
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 49 parts by mass of absolute ethyl alcohol and 11 parts by mass of deionized water into a high-pressure reaction kettle, then adding 30-50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, slowly adding 5 parts by mass of concentrated nitric acid into the mixed solution, reacting the mixture in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixture to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 40 parts of polyvinylidene fluoride solution and nano titanium dioxide in 100 parts of N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
Example 10
A preparation method of a photocatalytic sewage treatment membrane comprises the following steps:
firstly, adding 50 parts by mass of absolute ethyl alcohol and 15 parts by mass of deionized water into a high-pressure reaction kettle, then adding 50 parts by mass of tetraethyl titanate into the reaction kettle, and stirring for 1 hour to prepare a mixed solution;
step two, taking 8 parts by mass of concentrated nitric acid, slowly adding the concentrated nitric acid into the mixed solution, reacting the mixed solution in a reaction kettle at 180 ℃ for 24 hours, and cooling the mixed solution to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing a nano titanium dioxide solution with the mass fraction of 15% by using deionized water for the prepared titanium dioxide particles;
step five, mixing 40 parts of polyvinylidene fluoride solution and nano titanium dioxide in N, N-dimethylformamide according to the mass parts, and stirring for 2 hours at the temperature of 60-65 ℃ until the mixture is dissolved to prepare a casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
Wherein the relative molecular mass of the polyvinylidene fluoride is 441.
Wherein, the absolute ethyl alcohol and the concentrated nitric acid are analytically pure.
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 (5)
1. A photocatalytic sewage treatment membrane is characterized by comprising, by mass, 40-50 parts of absolute ethyl alcohol, 10-15 parts of deionized water, 30-50 parts of tetraethyl titanate, 5-8 parts of concentrated nitric acid, 30-40 parts of a polyvinylidene fluoride solution and 100 parts of N, N-dimethylformamide.
2. The preparation method of the photocatalytic sewage treatment membrane according to claim 1, wherein a polyvinylidene fluoride solution and a nano titanium dioxide solution are mixed in N, N-dimethylformamide and stirred for 2 hours at a temperature of 60-65 ℃ until dissolved to prepare a membrane casting solution; then, a glass rod is used for scraping the defoamed membrane casting solution on a glass plate to form a membrane with a certain thickness by taking a copper net as a carrier; and (3) soaking the copper mesh coated with the membrane casting solution into deionized water at 50 ℃, taking out after 24 hours of soaking, and naturally airing to obtain the photocatalytic sewage treatment membrane.
3. The method of claim 2, wherein the polyvinylidene fluoride has a relative molecular mass of 441.
4. The preparation method of the photocatalytic sewage treatment membrane as claimed in claim 2, wherein the preparation step of the nano titanium dioxide solution comprises the following steps:
firstly, adding absolute ethyl alcohol and deionized water into a high-pressure reaction kettle, then adding tetraethyl titanate into the reaction kettle, and stirring for 1h to prepare a mixed solution;
step two, slowly adding concentrated nitric acid into the mixed solution, reacting for 24 hours at 180 ℃ in a reaction kettle, and cooling to room temperature to obtain titanium dioxide particles;
step three, collecting the prepared titanium dioxide particles, cleaning with deionized water and absolute ethyl alcohol, and drying at 60 ℃;
step four, preparing the prepared titanium dioxide particles into a nano titanium dioxide solution with the mass fraction of 15% by using deionized water.
5. The method for preparing a photocatalytic sewage treatment membrane as recited in claim 4, wherein the absolute ethanol and the concentrated nitric acid are analytically pure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169604A (en) * | 2020-09-16 | 2021-01-05 | 王平 | Sewage treatment membrane material and preparation method thereof |
| CN113003815A (en) * | 2021-03-19 | 2021-06-22 | 山东建筑大学 | Continuous photocatalytic ultrafiltration cup, preparation method of fiber ball and preparation method of ultrafiltration membrane |
| CN115178110A (en) * | 2022-07-13 | 2022-10-14 | 浙江理工大学 | Sewage treatment membrane with efficient dynamic adsorption and photo-Fenton regeneration characteristics as well as preparation method and application thereof |
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| CN113003815B (en) * | 2021-03-19 | 2022-05-17 | 山东建筑大学 | Continuous photocatalytic ultrafiltration cup, preparation method of fiber ball and preparation method of ultrafiltration membrane |
| CN115178110A (en) * | 2022-07-13 | 2022-10-14 | 浙江理工大学 | Sewage treatment membrane with efficient dynamic adsorption and photo-Fenton regeneration characteristics as well as preparation method and application thereof |
| CN115178110B (en) * | 2022-07-13 | 2024-01-30 | 浙江理工大学 | Sewage treatment membrane with efficient dynamic adsorption and photo-Fenton regeneration characteristics, and preparation method and application thereof |
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Application publication date: 20200814 |