CN115159606A - Method for treating organic sewage by utilizing solar energy photo-thermal catalysis - Google Patents
Method for treating organic sewage by utilizing solar energy photo-thermal catalysis Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000002131 composite material Substances 0.000 claims abstract description 41
- 238000001704 evaporation Methods 0.000 claims abstract description 29
- 230000008020 evaporation Effects 0.000 claims abstract description 29
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 28
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 28
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 16
- 230000015556 catabolic process Effects 0.000 claims abstract description 14
- 238000006731 degradation reaction Methods 0.000 claims abstract description 14
- 230000003197 catalytic effect Effects 0.000 claims abstract description 13
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- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 5
- 239000012774 insulation material Substances 0.000 claims abstract description 3
- 239000012621 metal-organic framework Substances 0.000 claims description 45
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical group [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 claims description 36
- 229940043267 rhodamine b Drugs 0.000 claims description 36
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- 239000000758 substrate Substances 0.000 claims description 24
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
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- 238000002360 preparation method Methods 0.000 claims description 9
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- 239000013291 MIL-100 Substances 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
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- 239000000463 material Substances 0.000 description 10
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 9
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- 238000001291 vacuum drying Methods 0.000 description 7
- 239000004246 zinc acetate Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 6
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- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- GPNNOCMCNFXRAO-UHFFFAOYSA-N 2-aminoterephthalic acid Chemical compound NC1=CC(C(O)=O)=CC=C1C(O)=O GPNNOCMCNFXRAO-UHFFFAOYSA-N 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 2
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- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 description 2
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- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 2
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Images
Classifications
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Catalysts (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a method for treating organic sewage by utilizing solar photothermal catalysis, which comprises the steps of placing an MOF derived metal oxide/C composite material with double functions of hydrothermal evaporation and catalytic degradation of organic pollutants on the surface of a polystyrene foam heat insulation material wrapped by hydrophilic non-woven fabric to construct a solar water evaporator capable of floating on a water surface, wherein under the irradiation of sunlight, the surface of the MOF derived metal oxide/C composite material generates heat to promote water evaporation, and meanwhile, the organic pollutants are conveyed to the MOF derived metal oxide/C composite material along with water to carry out photothermal catalytic degradation, so that the degradation of the organic pollutants in the organic sewage and the acquisition of clean water are realized. The MOF-derived metal oxide/C composite material provided by the invention realizes effective treatment of organic pollutants and reduction of secondary pollution in the process of obtaining clean water by photo-thermal water evaporation, and can be used for treating multi-component complex organic sewage.
Description
Technical Field
The invention relates to the field of solar organic sewage treatment, in particular to a method for treating organic sewage by utilizing solar photothermal catalysis.
Background
With the development of urbanization and industrialization, the discharge of industrial sewage, agricultural sewage and domestic sewage in large quantities and the problem of water pollution caused by various organic pollutants, heavy metals and the like are becoming more serious.
Enhancing the development and utilization of water resources and effective water treatment are inevitable choices for solving water resource problems. However, the traditional seawater desalination and sewage treatment technologies, such as reverse osmosis, electrodialysis, heat pump desalination, multi-effect distillation, etc., still have the problems of complex equipment, high cost, high energy consumption, secondary pollution, etc.
The solar energy is used as a source of all things, is inexhaustible, and is a green clean energy with wide application prospect.
In recent years, solar-driven interface photo-thermal water evaporation technology has become an important research branch for seawater desalination and sewage treatment due to its sustainability, environmental friendliness, low cost and the like.
The solar energy driven interfacial water evaporation technology absorbs solar energy through a photo-thermal material and converts the solar energy into heat energy, the heat energy is concentrated on the water surface, a surface water layer is heated, and the water evaporation rate is improved.
Although the current photo-thermal material has a high water evaporation rate, most of the photo-thermal materials only have single water evaporation performance.
He et al (Chemical Engineering Journal 423 (2021) 130268) pyrolyzes a metal-organic framework material Ni-MOF to prepare a urchin-shaped porous carbon material SUC, and coats the surface of wood to form a composite evaporator, which exhibits excellent interfacial photothermal seawater evaporation performance. Under different carbonization temperatures, the SUC of the Ni-MOF derived carbon material has different appearances, and as the carbonization temperature is increased from 500 ℃ to 800 ℃, the secondary structure of the sea urchin is gradually changed into carbon nano-tubes from micron rods, and the top ends of the carbon tubes are wrapped with metal nano-particles. SUC-700, which is composed entirely of carbon tubes, exhibits a rich pore structure (mainly at micropores 0.9nm, mesopores 3.2nm and 9.3 nm) and a high specific surface area (235.2 m) 2 g -1 ) And is favorable for light absorption and water transmission.
Publication No. CN 112980399 A patent specification discloses a super-hydrophilic copper-based MOF photo-thermal fabric and a preparation method and application thereof, belonging to the technical field of photo-thermal material preparation. The preparation method comprises the steps of carrying out plasma etching treatment and deposition treatment by taking a polymer fabric film as a substrate to prepare a copper-coated polymer fabric film; subjecting the resulting copper-coated polymer fabric film to Cu (OH) 2 And (3) carrying out nanowire growth treatment and then carrying out hydrothermal treatment to prepare the super-hydrophilic copper-based MOF photo-thermal material. The super-hydrophilic copper-based MOF photo-thermal material has excellent super-hydrophilicity and ultrahigh evaporation efficiency due to the unique metal organic porous carbon skeleton structure, and provides a brand-new photo-thermal conversion material for a solar-driven interface seawater desalination technology. The preparation method is simple in preparation process, can realize large-scale production, and can be well applied to the field of preparation and application of the portable solar evaporator.
In the actual treatment of wastewater, such as wastewater discharged from printing, textile, paper and leather industries, the components are complex and often contain a large amount of organic pollutants. Most photothermal materials have limited ability to treat organic contaminants.
Therefore, there is a strong need to develop a new photothermal material and/or structure that can treat complex pollutants while photo-thermal water evaporation is performed.
Disclosure of Invention
The invention aims to solve the technical problem of establishing catalytic degradation performance on the basis of photo-thermal water evaporation performance and improving the efficiency of solar organic sewage treatment.
The invention provides a method for treating organic sewage by utilizing solar photothermal catalysis, which comprises the steps of growing an MOF precursor on a porous substrate, and preparing an MOF derivative metal oxide/C composite material through in-situ high-temperature carbonization. The MOF derived metal oxide/C composite material has excellent light absorption performance and hydrophilicity due to the unique hierarchical pore structure, has efficient photo-thermal evaporation and catalytic degradation performance due to the metal oxide/C composite structure formed by MOF carbonization, and can simultaneously realize photo-thermal water evaporation and catalytic degradation of organic pollutants. The MOF derivative metal oxide/C composite material is simple in preparation process, can be recycled for multiple times, and can be well applied to the field of solar organic sewage treatment.
A method for treating organic sewage by utilizing solar photothermal catalysis comprises the steps of placing an MOF derived metal oxide/C composite material with double functions of hydrothermal evaporation and catalytic degradation of organic pollutants on the surface of a polystyrene foam heat insulation material wrapped by hydrophilic non-woven fabric to construct a solar water evaporator capable of floating on a water surface, wherein under the irradiation of sunlight, the surface of the MOF derived metal oxide/C composite material generates heat to promote water evaporation, and meanwhile, the organic pollutants are conveyed to the MOF derived metal oxide/C composite material along with water to be subjected to photothermal catalytic degradation, so that the degradation of the organic pollutants in the organic sewage and the acquisition of clean water are realized;
the metal in the MOF derived metal oxide/C composite material is at least one of Co, ti, zn, fe and Cu;
the preparation method of the MOF derived metal oxide/C composite material comprises the following steps:
(1) Soaking the porous substrate in an MOF precursor mixed solution for MOF growth reaction, and drying after the reaction is finished to obtain an MOF/porous substrate;
(2) Carbonizing the MOF/porous substrate obtained in the step (1) at a high temperature of 300-1000 ℃ to obtain the MOF derivative metal oxide/C composite material.
Preferably, in the step (1), the porous substrate is carbon cloth, foamed nickel, foamed aluminum, foamed copper or stainless steel net.
Preferably, in the step (1), the thickness of the porous substrate is 0.1 to 10mm.
Preferably, in the step (1), the MOF precursor mixed liquor is MOF-5, MIL-100 (Fe) or NH 2 -a mixture of precursors of one or more of MIL-125 (Ti), HKUST-1, ZIF-67 (Co).
Preferably, in the step (2), the temperature increase rate of the high-temperature carbonization is 2 to 10 ℃/min.
Preferably, in the step (2), the heat preservation time for high-temperature carbonization at 300-1000 ℃ is 1-4 h.
Preferably, in the step (2), the atmosphere of the high-temperature carbonization is an inert gas, or a mixture of at least one of carbon dioxide, air and water vapor and an inert gas, the inert gas is at least one of nitrogen and argon, and the oxidation degree of the metal and C can be controlled by controlling the carbonization temperature, the carbonization time and the like. When the atmosphere of the high-temperature carbonization contains carbon dioxide, air and water vapor, the oxidation degree of the metal and C can be controlled by controlling the proportion of the carbon dioxide, the air and the water vapor.
Preferably, in the step (1), the MOF precursor mixed liquor is a mixed liquor of precursors of MOF-5 and HKUST-1, wherein the molar ratio of Zn to Cu is 1; the metal in the MOF derivative metal oxide/C composite material is copper and zinc, and the organic pollutant is rhodamine B. Researches find that the copper oxide/zinc oxide/C composite material formed by carbonizing the MOF-5 and the HKUST-1 in the proportion has a synergistic effect on photo-thermal water evaporation and rhodamine B degradation, and has a remarkable effect improvement compared with the copper oxide C composite material or the zinc oxide/C composite material formed by carbonizing the single MOF-5 or the HKUST-1.
Compared with the prior art, the invention has the main advantages that:
the MOF derived metal oxide/C composite material has a hierarchical pore structure, can be used as a water transmission channel, can reduce sunlight reflection, improves sunlight utilization rate, and has high and wide spectral absorption rate of 85-99% in a solar radiation range (300-2500 nm).
The MOF-derived metal oxide/C composite material provided by the invention realizes effective treatment of organic pollutants and reduction of secondary pollution in the process of obtaining clean water by photo-thermal water evaporation, and can be used for treating multi-component complex organic sewage.
Drawings
FIG. 1 is a photograph of the microstructure of the MOF-derived metal oxide/C composite provided in example 1.
FIG. 2 is a graph of the rate of photothermal water evaporation for the MOF-derived metal oxide/C composite provided in example 1.
FIG. 3 is a diagram of the UV-VIS absorption spectra of the rhodamine B aqueous solution and the purified water provided in example 1.
Fig. 4 is a graph of the organic wastewater removal efficiency of the MOF derived metal oxide/C composite provided in example 1.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
Example 1
The nickel foam was first cut to a thickness of 1.5mm into 5 cm diameter disks and then cleaned with deionized water and alcohol solution. The foamed nickel was placed in a beaker containing a mixed aqueous solution of cobalt nitrate hexahydrate and 2-methylimidazole (the mixed volume ratio of the cobalt nitrate hexahydrate solution (50 mM) and the 2-methylimidazole solution (0.4M) was 1), and immersed at room temperature (25 ℃) for 1 hour to perform a cobalt-based MOF growth reaction. And after the reaction is finished, vacuum drying at 60 ℃ to obtain the cobalt-based MOF precursor porous substrate.
And (3) putting the prepared cobalt-based MOF precursor porous substrate into a tube furnace, heating to 400 ℃ at a heating rate of 5 ℃/min in a nitrogen atmosphere, preserving heat for 1h, and then naturally cooling to room temperature to obtain the bifunctional MOF-derived cobalt oxide/C composite material, wherein the microstructure of the bifunctional MOF-derived cobalt oxide/C composite material is shown in figure 1, and the obtained MOF-derived composite material has a hierarchical pore structure.
A cylindrical beaker with the diameter of 5 cm is filled with a rhodamine B aqueous solution (20 mg/L), non-woven fabric-wrapped polystyrene foam is placed on an electronic balance, and the MOF derivative composite material is placed on the surface of the non-woven fabric-wrapped polystyrene foam to construct a sunlight absorber capable of floating on the water surface. At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.32kg m -2 h -1 The test results are shown in FIG. 2.
And (3) carrying out an absorbance test on the original rhodamine B aqueous solution and the purified water, wherein the original rhodamine B aqueous solution has an obvious characteristic peak, and the purified water does not have the characteristic peak, which shows that the purified water does not contain rhodamine B, and the test result is shown in figure 3.
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, wherein after reacting for 4h, the rhodamine B removal rate is 90%, and the test result is shown in figure 4. The metal oxide/C composite material structure can realize excellent double functions of photo-thermal water evaporation and organic matter catalytic degradation.
Example 2
The carbon cloth was first cut into 5 cm diameter disks 1 mm thick and then cleaned with deionized water and alcohol solution. Putting the carbon cloth into a reaction kettle containing a mixed N, N-dimethylformamide solution of isopropyl titanate and amino terephthalic acid (the mixing volume ratio of the isopropyl titanate solution (25 mM) to the amino terephthalic acid solution (50 mM) is 1), and carrying out a titanium-based MOF growth reaction at a constant temperature of 160 ℃ for 16 h. And after the reaction is finished, vacuum drying at 60 ℃ to obtain the titanium-based MOF precursor porous substrate.
And (3) placing the prepared titanium-based MOF precursor porous substrate into a tube furnace, heating to 600 ℃ at a heating rate of 2 ℃/min under a mixed atmosphere of nitrogen gas/air (volume ratio of 95.
A cylindrical beaker with the diameter of 5 cm is filled with a rhodamine B aqueous solution (20 mg/L), non-woven fabric-wrapped polystyrene foam is placed on an electronic balance, and the MOF derivative composite material is placed on the surface of the non-woven fabric-wrapped polystyrene foam to construct a sunlight absorber capable of floating on the water surface. At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.28kg m -2 h -1 。
And (3) carrying out an absorbance test on the original rhodamine B aqueous solution and the purified water, wherein the original rhodamine B aqueous solution has an obvious characteristic peak, and the purified water does not have the characteristic peak, which indicates that the purified water does not contain rhodamine B.
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, wherein the rhodamine B removal rate is 88% after the reaction is carried out for 4h.
Example 3
The stainless steel mesh of 0.5 mm thickness was first cut into 5 cm diameter discs and then cleaned with deionized water and alcohol solution. The stainless steel mesh is placed into a reaction kettle containing a mixed N, N-dimethylformamide solution of zinc acetate, copper acetate and terephthalic acid (the mixed volume ratio of the zinc acetate solution (2 mM), the copper acetate solution (2 mM) and the terephthalic acid solution (1.5 mM) is 2). And after the reaction is finished, vacuum drying at 60 ℃ to obtain the zinc-based MOF/copper-based MOF precursor porous substrate.
And (3) placing the prepared zinc-based MOF/copper-based MOF precursor porous substrate into a tube furnace, heating to 600 ℃ at a heating rate of 10 ℃/min under an argon atmosphere, preserving heat for 2h, and then naturally cooling to room temperature to obtain the difunctional MOF-derived zinc oxide/copper oxide/C composite material.
A cylindrical beaker with the diameter of 5 cm is filled with a rhodamine B aqueous solution (20 mg/L), non-woven fabric-wrapped polystyrene foam is placed on an electronic balance, and the MOF derivative composite material is placed on the surface of the non-woven fabric-wrapped polystyrene foam to construct a sunlight absorber capable of floating on the water surface. At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.35kg m -2 h -1 。
And (3) carrying out an absorbance test on the original rhodamine B aqueous solution and the purified water, wherein the original rhodamine B aqueous solution has an obvious characteristic peak, and the purified water does not have the characteristic peak, which indicates that the purified water does not contain rhodamine B.
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, wherein the rhodamine B removal rate is 92% after the reaction is carried out for 4h.
Comparative example 1
The stainless steel mesh of 0.5 mm thickness was first cut into 5 cm diameter discs and then cleaned with deionized water and alcohol solution. In a reaction kettle containing a zinc acetate, copper acetate and terephthalic acid mixed N, N-dimethylformamide solution (the mixed volume ratio of the zinc acetate solution (2 mM), the copper acetate solution (2 mM) and the terephthalic acid solution (1.5 mM) is 2).
At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.30kg m -2 h -1 。
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, wherein the rhodamine B removal rate is 90% after the reaction is carried out for 4h.
Example 4
The difference from the example 3 is that the stainless steel mesh is placed into a reaction kettle containing a mixed N, N-dimethylformamide solution of zinc acetate and terephthalic acid (the mixed volume ratio of the zinc acetate solution (2 mM) to the terephthalic acid solution (1.5 mM) is 4), the temperature is kept constant at 120 ℃ for 24 hours, the zinc-based MOF growth reaction is carried out, and after the reaction is finished, vacuum drying is carried out at 60 ℃ to obtain the zinc-based MOF precursor porous substrate. The rest of the experiments and procedures were identical.
At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.26kg m -2 h -1 。
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, wherein the rhodamine B removal rate is 87% after the reaction is carried out for 4h.
Example 5
The difference from the example 3 is that the stainless steel mesh is put into a reaction kettle containing a mixed N, N-dimethylformamide solution of copper acetate and terephthalic acid (the mixed volume ratio of the copper acetate solution (2 mM) to the terephthalic acid solution (1.5 mM) is 4), the temperature is kept constant at 120 ℃ for 24h, the growth reaction of the copper-based MOF is carried out, and after the reaction is finished, the vacuum drying is carried out at 60 ℃ to obtain the copper-based MOF precursor porous substrate. The rest of the experiments and procedures were identical.
At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the rhodamine B organic sewage is 1.29kg m -2 h -1 。
And (3) carrying out an absorbance test on the rhodamine B aqueous solution every 1h, and after reacting for 4h, wherein the rhodamine B removal rate is 88%.
Example 6
The copper foam was first cut to a thickness of 2mm into 5 cm diameter discs and then cleaned with deionized water and alcohol solution. The foam copper is put into a reaction kettle containing a mixed N, N-dimethylformamide solution of ferric chloride hexahydrate and trimesic acid (the mixing volume ratio of the ferric chloride hexahydrate solution (25 mM) to the trimesic acid solution (40 mM) is 1), and the iron-based MOF growth reaction is carried out at a constant temperature of 130 ℃ for 16 h. And after the reaction is finished, vacuum drying at 60 ℃ to obtain the iron-based MOF precursor porous substrate.
And (3) putting the prepared iron-based MOF precursor porous substrate into a tube furnace, heating to 600 ℃ at a heating rate of 10 ℃/min under the mixed atmosphere of argon gas/carbon dioxide (volume ratio is 95.
A cylindrical beaker with the diameter of 5 cm is filled with methylene blue aqueous solution (20 mg/L), polystyrene foam wrapped by non-woven fabric is placed on an electronic balance, and the MOF derivative composite material is placed on the surface of the polystyrene foam wrapped by the non-woven fabric to construct a sunlight absorber capable of floating on the water surface. At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the methylene blue organic sewage is 1.30kg m -2 h -1 。
And (3) performing an absorbance test on the original methylene blue aqueous solution and the purified water, wherein the original methylene blue aqueous solution has an obvious characteristic peak, and the purified water has no characteristic peak, which indicates that the purified water does not contain methylene blue.
And (4) carrying out an absorbance test on the methylene blue aqueous solution every 1h, and after reacting for 4h, obtaining a methylene blue removal rate of 85%.
Example 7
The foamed aluminum, 4 mm thick, was first cut into 5 cm diameter disks and then the stainless steel mesh was cleaned with deionized water and alcohol solution. Placing a stainless steel net into a reaction kettle containing a mixed N, N-dimethylformamide solution (the mixed volume ratio of isopropyl titanate solution (5 mM), zinc acetate solution (2 mM) and terephthalic acid solution (3 mM)) of 2. And after the reaction is finished, vacuum drying at 60 ℃ to obtain the titanium-based MOF/zinc-based MOF precursor porous substrate.
And (2) putting the prepared titanium-based MOF/zinc-based MOF precursor porous substrate into a tube furnace, heating to 800 ℃ at a heating rate of 5 ℃/min under a mixed atmosphere of nitrogen gas/water vapor (volume ratio is 95.
A cylindrical beaker with the diameter of 5 cm is filled with a mixed aqueous solution (total concentration is 20 mg/L) of methylene blue, rhodamine B and methyl orange (mass ratio is 1. At 1.0kW/m 2 Under the simulated solar illumination, the water evaporation efficiency of the mixed organic sewage is 1.32kg m -2 h -1 。
And (3) performing an absorbance test on the original mixed aqueous solution and the purified water, wherein the original mixed aqueous solution has an obvious characteristic peak, and the purified water has no characteristic peak, which indicates that the purified water does not contain methylene blue, rhodamine B and methyl orange.
And (4) carrying out an absorbance test on the mixed aqueous solution every 1h, and after reacting for 4h, wherein the removal rate of the total concentration of the pollutants is 90%. Shows that the composite organic sewage treatment agent has excellent complex component organic sewage treatment performance.
Furthermore, it should be understood that various changes or modifications can be made by those skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention defined by the appended claims.
Claims (8)
1. A method for treating organic sewage by utilizing solar photothermal catalysis is characterized in that an MOF derivative metal oxide/C composite material with double functions of hydrothermal evaporation and catalytic degradation of organic pollutants is placed on the surface of a polystyrene foam heat insulation material wrapped by hydrophilic non-woven fabric to construct a solar water evaporator capable of floating on a water surface, under the irradiation of sunlight, the surface of the MOF derivative metal oxide/C composite material generates heat to promote water evaporation, meanwhile, the organic pollutants are conveyed to the MOF derivative metal oxide/C composite material along with water to carry out photothermal catalytic degradation, so that the degradation of the organic pollutants in the organic sewage and the acquisition of clean water are realized;
the metal in the MOF derivative metal oxide/C composite material is at least one of Co, ti, zn, fe and Cu;
the preparation method of the MOF derivative metal oxide/C composite material comprises the following steps:
(1) Soaking the porous substrate in an MOF precursor mixed solution to carry out MOF growth reaction, and drying after the reaction is finished to obtain an MOF/porous substrate;
(2) Carbonizing the MOF/porous substrate obtained in the step (1) at a high temperature of 300-1000 ℃ to obtain the MOF derivative metal oxide/C composite material.
2. The method for treating organic sewage by solar photothermal catalysis according to claim 1, wherein in step (1), the porous substrate is carbon cloth, foamed nickel, foamed aluminum, foamed copper or stainless steel mesh.
3. The method for solar photothermal catalytic treatment of organic wastewater according to claim 1, wherein in step (1), the thickness of said porous substrate is 0.1 to 10mm.
4. The method for treating organic sewage by using solar photothermal catalysis according to claim 1, wherein in step (1), the MOF precursor mixed liquor is MOF-5, MIL-100 (Fe), NH 2 -a mixture of precursors of one or more of MIL-125 (Ti), HKUST-1, ZIF-67 (Co).
5. The method for solar photothermal catalytic treatment of organic wastewater according to claim 1, wherein in step (2), the temperature rise rate of the high temperature carbonization is 2-10 ℃/min.
6. The method for treating organic sewage by solar photothermal catalysis according to claim 1, wherein in step (2), the temperature of the high-temperature carbonization at 300-1000 ℃ is maintained for 1-4 hours.
7. The method for solar photothermal catalytic treatment of organic sewage according to claim 1, wherein in step (2), the atmosphere of high temperature carbonization is inert gas, or a mixture of at least one of carbon dioxide, air and water vapor and inert gas, and the inert gas is at least one of nitrogen and argon.
8. The method for treating organic sewage by using solar photothermal catalysis according to claim 1, wherein in step (1), the MOF precursor mixed solution is a mixed solution of precursors of MOF-5 and HKUST-1, wherein the molar ratio of Zn to Cu is 1;
the metal in the MOF derivative metal oxide/C composite material is copper and zinc, and the organic pollutant is rhodamine B.
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