CN111229060A - Method for preparing hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by taking high-silicon high-calcium industrial solid waste as raw material - Google Patents
Method for preparing hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by taking high-silicon high-calcium industrial solid waste as raw material Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 79
- 239000012528 membrane Substances 0.000 title claims abstract description 68
- 229910052882 wollastonite Inorganic materials 0.000 title claims abstract description 32
- 239000010456 wollastonite Substances 0.000 title claims abstract description 32
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 29
- 239000002910 solid waste Substances 0.000 title claims abstract description 27
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 26
- 239000002994 raw material Substances 0.000 title claims abstract description 24
- 238000010345 tape casting Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011575 calcium Substances 0.000 title claims abstract description 9
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 9
- 239000010703 silicon Substances 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000498 ball milling Methods 0.000 claims abstract description 21
- 239000004695 Polyether sulfone Substances 0.000 claims abstract description 13
- 229920006393 polyether sulfone Polymers 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 8
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 8
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000292 calcium oxide Substances 0.000 claims abstract description 7
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 7
- 230000003213 activating effect Effects 0.000 claims abstract description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 3
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- 238000009849 vacuum degassing Methods 0.000 claims abstract description 3
- 238000001035 drying Methods 0.000 claims description 22
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 11
- 239000002243 precursor Substances 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000003607 modifier Substances 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 4
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229920001843 polymethylhydrosiloxane Polymers 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
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- 239000012266 salt solution Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 238000001238 wet grinding Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 10
- 239000008367 deionised water Substances 0.000 abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 abstract description 6
- 230000004907 flux Effects 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000004821 distillation Methods 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 18
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- 241000282414 Homo sapiens Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 239000011324 bead Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
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- 230000004083 survival effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/024—Oxides
- B01D71/027—Silicium oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D67/0002—Organic membrane manufacture
- B01D67/0004—Organic membrane manufacture by agglomeration of particles
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/22—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in calcium oxide, e.g. wollastonite
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
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Abstract
A method for preparing hydrophobic porous wollastonite ceramic membrane for desalination by tape casting using high-silicon high-calcium industrial solid waste as raw material belongs to the technical field of desalination, and uses high-silicon high-calcium solid waste as raw materialThe hydrophobic porous wollastonite ceramic membrane is prepared by tape casting at low cost and is used for membrane distillation desalination. Firstly, washing solid waste to be neutral by using deionized water, and then activating; mixing activated high-silicon high-calcium solid waste with activated calcium oxide and silicon dioxide, adding CaO: SiO 22: the solid waste is 13.6%: 35%: 51.4 percent (mass fraction), and preparing wollastonite raw material. Mixing and ball-milling wollastonite raw materials with polyether sulfone (PESf) serving as a binder, polyvinylpyrrolidone (PVP) serving as a dispersant and N-methyl pyrrolidone (NMP) serving as an organic solvent, carrying out vacuum degassing, carrying out tape casting and phase transformation to obtain a ceramic membrane blank, then calcining, and finally modifying by using a hydrophobic agent to obtain the wollastonite porous ceramic membrane with uniformly distributed pore structures, good hydrophobicity, desalination rate and desalination flux.
Description
Technical Field
The invention relates to a method for preparing a hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by taking high-silicon high-calcium industrial solid waste as a raw material, belonging to the technical field of desalination.
Background
It is well known that water is the origin of life, is the basic substance on which human beings rely for survival and life, and is also an irreplaceable natural resource on the earth. All economic production and life can not be boiled, and water is essential no matter how the society develops, especially fresh water. 65% of the world's water resources are concentrated in ten countries, and the global water supply is now unevenly distributed and scarce, resulting in a severe shortage of water resources in 88 developing countries with over 50% of the world's population. There are also 26 countries (about 2.3 billion population) with a shortage of water resources.
72% of the earth's surface is covered with water, but there are few pure fresh water resources that can be directly used for productive life. The total water quantity of the earth is 1.386 hundred million tons, the reserves are considerable, but nearly 96.5 percent of the total water quantity is seawater and brackish water, fresh water only accounts for 2.5 percent of the total water quantity of the earth, the 2.5 percent of the fresh water cannot be applied to human beings, because 68.7 percent of the fresh water is frozen in glaciers at two poles, the rest 31.3 percent of the fresh water is underground fresh water and surface water (rivers, lakes and the like), and the underground fresh water cannot be exploited and utilized, the water which can be directly utilized by the human beings only accounts for 0.3 percent of the total water quantity. The water resource problem has become a problem that all mankind must face together. Desalination of sea water and reuse of waste water have been the two most effective methods to solve the major challenge of shortage of fresh water resources. Especially for the countries with water shortage, such as the middle east and the north africa, seawater desalination is the most feasible method for guaranteeing fresh water supply. At present, the seawater desalination technology in the world is mainly matured in the United states, the middle east, Japan and other areas, and the seawater desalination technology has a long history and mature technology, and the scale of seawater desalination is also in the front of the world.
The development of desalination technology, and the supply of water to the ocean is a common consensus in all countries in the world today. Sea water desalination mainly comprises a heat treatment method and a membrane treatment method. The former has multi-stage flash evaporation, multi-effect distillation, etc. and has the advantages of high yield and mature technology, but has high energy consumption. Therefore, the membrane treatment method has been receiving attention widely. But how to prepare the high-efficiency and stable membrane material becomes the key. Compared with other membrane materials, the ceramic membrane has the advantages of good chemical stability, good mechanical strength, strong antimicrobial capability, good thermal stability, narrow pore size distribution, high separation efficiency, controllable microstructure, easy cleaning and regeneration, long service life, environmental friendliness and the like, so that the ceramic membrane with high flux and stable property is prepared by taking industrial waste as a raw material at low cost.
Disclosure of Invention
The invention aims to provide a method for preparing a hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by using high-silicon high-calcium industrial solid waste as a raw material for desalination and then desalting seawater, which not only solves the environmental problem caused by accumulation of the industrial solid waste, but also greatly reduces the preparation cost of the ceramic membrane, and simultaneously, the prepared ceramic membrane has better desalination effect.
The invention is carried out according to the following steps:
a method for preparing hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by taking high-silicon high-calcium industrial solid waste as a raw material is characterized by comprising the following steps:
(1) activating the washed solid waste at 540 ℃ for one hour, and activating calcium oxide and silicon dioxide at 900 ℃ for one hour;
(2) mixing the activated solid waste with activated calcium oxide and silicon dioxide to obtain solid waste: CaO: SiO 2275.68%: 13.42%: 10.90 percent (mass fraction) of wollastonite raw material A is prepared;
(3) wet grinding, drying, crushing and sieving the raw material A obtained in the step (2) to obtain a raw material B;
(4) carrying out ball milling on a binder polyether sulfone (PESf), a dispersant polyvinylpyrrolidone (PVP) and an organic solvent N-methyl pyrrolidone (NMP) to obtain a uniform organic solution C;
(5) mixing the organic solution C obtained in the step (4) with the raw material B, performing ball milling to obtain uniformly mixed ceramic slurry, and performing vacuum degassing treatment to obtain ceramic slurry D;
(6) carrying out tape casting on the ceramic slurry D obtained in the step (5) on a tape casting machine to obtain a ceramic membrane precursor E;
(7) quickly putting the ceramic membrane precursor E obtained in the step (6) into water for phase conversion for 24 hours, and then putting the ceramic membrane precursor E in an air atmosphere for drying for 48 hours to obtain a ceramic membrane blank body X;
(8) calcining the ceramic membrane blank X obtained in the step (7) at 1050 ℃ for 5 hours to obtain a ceramic plate Y;
(9) soaking the ceramic wafer Y obtained in the step (8) in a hydrophobic modifier, and treating for 1h at 600 ℃ under the protection of nitrogen to obtain a hydrophobic ceramic membrane Z;
(10) and (4) drying the hydrophobic ceramic membrane Z obtained in the step (9) and then carrying out a desalting experiment.
2. In the step 1), the solid waste is washed by water to remove other oxide impurities, the washing frequency is 10 times, and finally the obtained industrial waste residue is dried, wherein the drying temperature is 120 ℃, and the drying time is 3-5 h.
3. In step 1), the activation is carried out in a muffle furnace.
4. In the step 3), the ball mill is a planetary ball mill, and runs in a single direction for 4 hours.
5. In the step 3), the drying temperature is 100 ℃, the drying time is 24 hours, and the sieve is a standard sieve with 300 meshes.
6. In the step 4), PESf, NMP and PVP are respectively 7g, 56g and 2.24g
7. In the step 4), the ball mill is a planetary ball mill, and runs in a single direction for 2 hours.
8. In step 5), raw material B: the proportions of PESf are 9: 1.
9. in the step 5), the ball mill is a planetary ball mill, and runs in a single direction for 24 hours.
10. In the step 6), the casting parameters are that the height of a scraper is 2mm, and the running speed of the scraper is 6 mm/S.
11. In step 8), the calcination is carried out in a muffle furnace.
12. In the step 9), the hydrophobic modifier is prepared by dissolving 1.5mL of polymethylhydrosiloxane in 15mL of n-heptane to form a mixed solution, adding 0.5mL of ethyl orthosilicate and 0.1mL of dibutyltin dilaurate, and uniformly stirring at room temperature.
13. In the step 10), the salt solution for the seawater desalination experiment is a sodium chloride solution with the mass fraction of 3.5%.
Drawings
FIG. 1 XRD spectra of ceramic membranes
FIG. 2. feed B: the PESf ratio is 9: 1; 8:1 aperture profile
FIG. 3 is a water contact angle diagram of a ceramic film before and after hydrophobic modification
FIG. 4 is a diagram showing the desalination flux and desalination rate of a preferred ceramic membrane
Detailed Description
Example 1
Washing the solid waste to be neutral by deionized water, and drying for 3 hours at 120 ℃ for later use. 110g of solid waste after being washed and dried is taken in a muffle furnace, and is subjected to heat preservation and activation for one hour at the temperature of 540 ℃. Respectively taking 50g of activated solid waste, 8.865g of CaO and 7.205g of SiO2And absolute ethyl alcohol are added into the ball milling tank together, and the mass ratio of the absolute ethyl alcohol to the ball milling beads is as follows: wollastonite raw materials: the absolute ethyl alcohol is 300: 60: and 12, weighing the materials according to the same mass, adding the materials into another symmetrical ball milling tank, and carrying out ball milling for 5 hours. And transferring the slurry obtained after ball milling into a beaker, drying for 24h at 100 ℃, crushing the dried sample, and sieving by a standard sieve of 300 meshes for later use. Weighing NMP56g, PESf 7g and PVP2.24g, and putting the components into a ball milling tank for ball milling for 2h to obtain a uniformly mixed organic solution. Weighing 56g of sieved wollastonite raw material, placing the sieved powder into the uniformly mixed organic solution, and performing ball milling and mixing for 24 hours to obtain uniformly mixed wollastonite ceramic membrane slurry. Will be provided withAnd after removing air, the obtained ceramic membrane slurry is put into a tape casting system for tape casting to obtain the wollastonite ceramic membrane precursor. The height of the casting blade is 2mm, and the running speed of the blade is 6 mm/S. And quickly placing the wollastonite ceramic membrane precursor subjected to tape casting into deionized water for phase conversion for 24 hours, and drying for 48 hours to obtain a wollastonite ceramic membrane green body. And (3) putting the obtained wollastonite ceramic membrane blank into a muffle furnace, preserving heat for 3h at 600 ℃, calcining for 5h at 1050 ℃, cooling to 200 ℃, and stopping preserving heat and cooling to room temperature. And taking out the ceramic membrane after calcination, alternately washing the ceramic membrane with deionized water and ethanol for five times, and drying the ceramic membrane for 24 hours at 100 ℃ for later use. And dissolving 1.5mL of polymethylhydrosiloxane in 15mL of n-heptane to form a mixed solution, adding 0.5mL of tetraethoxysilane and 0.1mL of dibutyltin dilaurate, and uniformly stirring at room temperature to prepare the modifier. And adding the dried porous wollastonite ceramic membrane into a modifier, ultrasonically oscillating for 3min, and then placing the ceramic membrane into a tubular resistance furnace to be treated for 1h at 600 ℃ under the protection of nitrogen to obtain the hydrophobic porous wollastonite ceramic membrane. Taking out, washing with ethanol, drying in a drying oven at 100 deg.C for 24 hr, and performing pore diameter analysis test. The prepared hydrophobic ceramic membrane has a good pore structure and a good hydrophobic effect when the contact angle of the hydrophobic ceramic membrane to water is 155 degrees.
Example 2
The solid waste was washed 10 times with distilled water to neutrality and dried at 120 ℃ for 4 h. Taking 110g of solid waste which is washed and dried by water, putting the solid waste into a muffle furnace, heating to 540 ℃, activating for one hour, and respectively taking 50g of activated solid waste, 8.865g of CaO, and 7.205g of SiO2And absolute ethyl alcohol are added into the ball milling tank together, and the mass ratio of the absolute ethyl alcohol to the ball milling beads is as follows: wollastonite raw materials: the absolute ethyl alcohol is 300: 60: and 12, weighing the materials according to the same mass, adding the materials into another symmetrical ball milling tank, and carrying out ball milling for 5 hours. And transferring the slurry obtained after ball milling into a beaker, drying for 24h at 100 ℃, crushing the dried sample, and sieving by a standard sieve of 300 meshes for later use. NMP56g, PESf 7g and PVP2.24g are weighed and put into a ball milling tank for ball milling for 2 hours to obtain an organic solution which is uniformly mixed. Weighing 56g of sieved wollastonite raw material, placing the sieved powder into the uniformly mixed organic solution, and performing ball milling and mixing for 24 hours to obtain uniformly mixed wollastonite ceramic membrane slurry. Removing voids from the obtained ceramic membrane slurryAnd then placing the mixture into a tape casting system for tape casting to obtain the wollastonite ceramic membrane precursor. The height of the casting blade is 2mm, and the running speed of the blade is 6 mm/S. And quickly placing the wollastonite ceramic membrane precursor subjected to tape casting into deionized water for phase conversion for 24 hours, and drying for 48 hours to obtain a wollastonite ceramic membrane green body. And (3) putting the obtained wollastonite ceramic membrane blank into a muffle furnace, preserving heat for 3h at 600 ℃, calcining for 5h at 1050 ℃, cooling to 200 ℃, and stopping preserving heat and cooling to room temperature. And taking out the ceramic membrane after calcination, alternately washing the ceramic membrane with deionized water and ethanol for five times, and drying the ceramic membrane for 24 hours at 100 ℃ for later use. And dissolving 1.5mL of polymethylhydrosiloxane in 15mL of n-heptane to form a mixed solution, adding 0.5mL of tetraethoxysilane and 0.1mL of dibutyltin dilaurate, and uniformly stirring at room temperature to prepare the modifier. And adding the dried porous wollastonite ceramic membrane into a modifier, ultrasonically oscillating for 3min, and then placing the ceramic membrane into a tubular resistance furnace to be treated for 1h at 600 ℃ under the protection of nitrogen to obtain the hydrophobic porous wollastonite ceramic membrane. Taking out, washing with ethanol, drying in a drying oven at 100 deg.C for 24 hr, and performing pore diameter analysis test. The prepared hydrophobic ceramic membrane has good pore structure, a contact angle to water of 155 degrees, a desalination rate of 99.99 percent and a flux of 20.26Kg/m2h。
FIG. 1 shows the XRD analysis pattern of the ceramic film obtained by tape casting and solid-phase sintering, and it can be seen from FIG. 1 that the ceramic film prepared is wollastonite ceramic film. FIG. 2 is a graph showing the pore size distribution of a ceramic membrane prepared by mixing ceramic powder and PESF at a ratio of 9:1 and 8:1, and it can be seen that the two component ceramic membranes have good pore size distribution, the average pore size of the ceramic membrane at the ratio of 9:1 is 0.4718 μm, and the average pore size of the ceramic membrane at the ratio of 8:1 is 0.7584 μm. FIG. 3 is a schematic diagram of a ceramic membrane after being modified by a hydrophobic agent, wherein the water contact angle reaches 155 degrees after hydrophobic modification, and the ceramic membrane has a good hydrophobic effect. FIG. 4 shows the results of desalination experiments at different temperatures for ceramic membranes with a 9:1 ratio of ceramic powder to PESF, and it can be seen that the desalination flux increases with increasing temperature and the desalination rate remains stable at 99.99%.
Claims (8)
1. A method for preparing hydrophobic porous wollastonite ceramic membrane for desalination by tape casting by taking high-silicon high-calcium industrial solid waste as a raw material is characterized by comprising the following steps:
(1) activating the washed solid waste at 540 ℃ for one hour, and activating calcium oxide and silicon dioxide at 900 ℃ for one hour;
(2) mixing the activated solid waste with activated calcium oxide and silicon dioxide to obtain solid waste: CaO: SiO 2275.68%: 13.42%: 10.90 percent of wollastonite raw material A is prepared and formed;
(3) wet grinding, drying, crushing and sieving the raw material A obtained in the step (2) to obtain a raw material B;
(4) carrying out ball milling on a binder polyether sulfone (PESf), a dispersant polyvinylpyrrolidone (PVP) and an organic solvent N-methyl pyrrolidone (NMP) to obtain a uniform organic solution C; wherein, the mass ratio of PESf to NMP to PVP is 7: 56: 2.24;
(5) mixing the organic solution C obtained in the step (4) with the raw material B, performing ball milling to obtain uniformly mixed ceramic slurry, and performing vacuum degassing treatment to obtain ceramic slurry D; raw material B: the mass ratio of PESf is 9: 1;
(6) carrying out tape casting on the ceramic slurry D obtained in the step (5) on a tape casting machine to obtain a ceramic membrane precursor E;
(7) putting the ceramic membrane precursor E obtained in the step (6) into water for phase conversion for 24 hours, and then putting the ceramic membrane precursor E in an air atmosphere for drying for 48 hours to obtain a ceramic membrane blank body X;
(8) calcining the ceramic membrane blank X obtained in the step (7) at 1050 ℃ for 5 hours to obtain a ceramic plate Y;
(9) and (5) soaking the ceramic wafer Y obtained in the step (8) in a hydrophobic modifier, and treating for 1h at 600 ℃ under the protection of nitrogen to obtain a hydrophobic ceramic membrane Z.
2. The method according to claim 1, wherein in the step (1), the solid waste is washed by water for removing oxide impurities, the washing frequency is 10 times, and the obtained industrial waste residue is dried at 120 ℃ for 3-5 h.
3. The method of claim 1, wherein in step (1), the activation is performed in a muffle furnace.
4. The method according to claim 1, wherein the ball mill is a planetary ball mill operated unidirectionally for a period of 4 hours.
5. The method according to claim 1, wherein in the step (3), the drying temperature is 100 ℃, the drying time is 24 hours, and the sieve is a 300-mesh standard sieve.
6. The method according to claim 1, wherein in step 6), the casting parameter is blade height 2mm and blade running speed 6 mm/S.
7. The method of claim 1, wherein in step (9), the hydrophobic modifier is prepared by dissolving 1.5mL of polymethylhydrosiloxane in 15mL of n-heptane to form a mixed solution, adding 0.5mL of ethyl orthosilicate and 0.1mL of dibutyltin dilaurate, and stirring at room temperature.
8. The method as claimed in claim 1, wherein in the step (10), the salt solution for seawater desalination experiment is 3.5% sodium chloride solution by mass fraction.
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| CN113019134A (en) * | 2021-02-27 | 2021-06-25 | 北京工业大学 | Method for improving hydrophobic stability of porous ceramic membrane for desalination |
| CN113019158A (en) * | 2021-03-03 | 2021-06-25 | 北京工业大学 | Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination by dry pressing and molding blast furnace slag as main raw material |
| CN113336529A (en) * | 2021-07-12 | 2021-09-03 | 南京九思高科技有限公司 | Multi-channel water-in-oil type emulsion membrane and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112341153A (en) * | 2020-10-20 | 2021-02-09 | 上海航翼高新技术发展研究院有限公司 | Waste porous magnetic ceramic system based on 3D printing technology and preparation method thereof |
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| CN113019158A (en) * | 2021-03-03 | 2021-06-25 | 北京工业大学 | Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination by dry pressing and molding blast furnace slag as main raw material |
| CN113336529A (en) * | 2021-07-12 | 2021-09-03 | 南京九思高科技有限公司 | Multi-channel water-in-oil type emulsion membrane and preparation method thereof |
| CN113336529B (en) * | 2021-07-12 | 2023-01-31 | 南京九思高科技有限公司 | Multi-channel water-in-oil type emulsion membrane and preparation method thereof |
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