CN114715971A - Preparation method and application of solar-driven interface sewage treatment device - Google Patents
Preparation method and application of solar-driven interface sewage treatment device Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 27
- 238000011282 treatment Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000243 solution Substances 0.000 claims abstract description 37
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 32
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 32
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 16
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 13
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 11
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 10
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229960001149 dopamine hydrochloride Drugs 0.000 claims abstract description 8
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007598 dipping method Methods 0.000 claims abstract description 6
- 238000000746 purification Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 229920001690 polydopamine Polymers 0.000 claims description 51
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 37
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 36
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000004065 wastewater treatment Methods 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 150000007974 melamines Polymers 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000002957 persistent organic pollutant Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000012855 volatile organic compound Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000031700 light absorption Effects 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229960003638 dopamine Drugs 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000580 poly(melamine) Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000011269 treatment regimen Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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- 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
-
- 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
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
- B01J31/069—Hybrid organic-inorganic polymers, e.g. silica derivatized with organic groups
-
- 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
-
- B01J35/39—
-
- 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
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2101/10—Inorganic 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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a preparation method of a solar-driven interface sewage processor and application of the solar-driven interface sewage processor in solar-driven water purification, wherein the method comprises the following steps: adding trihydroxymethyl aminomethane, dopamine hydrochloride, copper sulfate and hydrogen peroxide into water, stirring, and dissolving completely; dipping the melamine foam into the mixed solution, standing, taking out a product, and then washing and drying; and (4) immersing the dried product in a silver nitrate solution, taking out the product and immediately placing the product in a sodium chloride solution, and repeating the operation. And (3) placing the treated product under an ultraviolet lamp for irradiation, taking out the product, and washing and drying to obtain the solar-driven interface sewage treatment device. The device effectively removes various inorganic salts and organic pollutants (volatility and nonvolatility) in the water body, and realizes the interface water cleaning driven by solar energy.
Description
Technical Field
The invention relates to the fields of environmental engineering, material synthesis and device design, in particular to a preparation method of a solar-driven interface sewage treatment device and application thereof in solar-driven water purification.
Background
The solar energy driven interface water treatment technology can realize the high-efficiency absorption of solar energy, convert the solar energy into heat energy, is locally positioned at a water-gas interface, efficiently utilizes the heat energy and realizes liquid-gas-liquid conversion. The technology is driven by solar energy, has low consumption, cleanness and no pollution, and is considered to be a water treatment strategy with important prospect. Currently, the technology is still in the research and development stage, and there are still a series of obstacles to its practical application, especially in the face of water sources containing volatile pollutants.
The problem stems from the fact that during the liquid-gas-liquid conversion process of this technology, Volatile Organic Compounds (VOCs) present in the water source can evaporate along with the water and be collected with the water in the condensate. Meanwhile, the heat energy localized at the water-air interface can further promote the evaporation of VOCs and the enrichment in condensed water. Therefore, how to design a solar-driven interface type water evaporation system can remove VOCs and other pollutants on the premise of ensuring high evaporation rate, and has important significance for development and practical application of solar-driven interface water purification technology.
Disclosure of Invention
The invention provides a preparation method of a solar-driven interface sewage treatment device and application thereof in solar-driven water purification. Experiments prove that the portable device has good purification effect on sewage and seawater.
A preparation method of a solar-driven interface sewage treatment device comprises the following steps:
1) adding trihydroxymethyl aminomethane, dopamine hydrochloride, copper sulfate and hydrogen peroxide into water, stirring, and fully dissolving to obtain a mixed solution;
2) dipping Melamine Foam (MF) into the mixed solution obtained in the step 1), and standing for 3-9 h to realize the growth of Polydopamine (PDA) on the surface of the polydopamine. Taking out the product, washing, and drying in an oven at 60-100 ℃ to obtain polydopamine modified melamine foam (PDA/MF);
3) and (3) dipping the dried product in a silver nitrate solution for 1-4 min, taking out, immediately placing in a sodium chloride solution for 1-4 min, repeating the operation for 10-30 times, and depositing silver chloride (AgCl) on the foam obtained in the step 2) to obtain silver chloride/polydopamine/melamine foam (AgCl/PDA/MF).
4) And (3) irradiating the product treated in the step 3) for 1-4 hours under an ultraviolet lamp, and reducing part of silver chloride into silver (Ag). And taking out the product, washing and drying to obtain the poly dopamine/melamine foam (Ag/AgCl/PDA/MF) modified by silver/silver chloride, which is used as a solar-driven interface sewage treatment device.
In the step 1), the concentration of the trihydroxymethyl aminomethane in the mixed solution is (30-80) multiplied by 10-3mol/L, the concentration of the dopamine hydrochloride is (5-11) multiplied by 10-3mol/L, the concentration of copper sulfate is (0.5-5) multiplied by 10-3mol/L and the concentration of hydrogen peroxide is (30-80) multiplied by 10-3mol/L. Most preferably, the concentration of tris (hydroxymethyl) aminomethane in the mixed solution is 50 × 10-3mol/L, the concentration of dopamine hydrochloride is 8 multiplied by 10-3mol/L, the concentration of copper sulfate is 2 multiplied by 10-3mol/L and a hydrogen peroxide concentration of 50X 10-3mol/L。
The stirring time is 0.5-2 h, and the preferable time is 1 h.
In the step 2), the volume of the melamine foam is 2 multiplied by 2cm3。
And standing for 5-7 h, and preferably standing for 6 h.
Washing was by deionized water.
The drying conditions are as follows: and (3) drying in an oven at 70-90 ℃, and further preferably drying in an oven at 80 ℃.
And in the step 3), dipping the dried product in a silver nitrate solution for 1.5-2.5 min, taking out, immediately placing in a sodium chloride solution for 1.5-2.5 min, and repeating the operation for 15-25 times. Most preferably, the dried product is immersed in a silver nitrate solution for 2min, taken out and immediately placed in a sodium chloride solution for 2min, and the above operation is repeated 20 times.
In the step 3), the concentration of the silver nitrate solution is (0.5-2.0) multiplied by 10-3mol/L, the concentration of the sodium chloride solution is (0.5-2.0) multiplied by 10-3mol/L。
In the step 3), the volume ratio of the silver nitrate solution to the sodium chloride solution is 1: 0.5-1.5, and the most preferable ratio is 1: 1.
In the step 4), the product treated in the step 3) is placed under an ultraviolet lamp for irradiation for 1.5-3 h, and most preferably, the product treated in the step 3) is placed under the ultraviolet lamp for irradiation for 2 h.
The washing adopts deionized water for washing.
The drying conditions are as follows: and (3) drying in an oven at 70-90 ℃, and further preferably drying in an oven at 80 ℃.
Most preferably, the preparation method of the solar driven interface sewage processor comprises the following steps:
1) the trihydroxymethyl aminomethane, dopamine hydrochloride, copper sulfate and hydrogen peroxide are added into 20mL deionized water in sequence, stirred for 1h and fully dissolved.
2) The volume of the solution is 2X 2cm3The melamine foam of (2) was immersed in the above solution and allowed to stand for 6 hours. The product was removed, washed with deionized water and dried in an oven at 80 ℃.
3) And soaking the dried product in silver nitrate solution for 2min, taking out, immediately placing in sodium chloride solution for 2min, and repeating the above operation for 20 times.
4) And (3) placing the treated product under an ultraviolet lamp for irradiating for 2 hours, taking out the product, washing the product by deionized water, and drying the product in an oven at 80 ℃. To obtain Ag/AgCl/PDA/MF.
In the step 1), the concentration of the tris (hydroxymethyl) aminomethane in the mixed solution is 50X 10-3mol/L, the concentration of the hydrochloric acid dopamine is 8 multiplied by 10-3mol/L, the concentration of copper sulfate is 2 multiplied by 10-3mol/L and a hydrogen peroxide concentration of 50X 10-3mol/L。
In the step 3), the concentration of the silver nitrate solution is 1.5 multiplied by 10-3mol/L, concentration of sodium chloride solution is 1.5X 10-3mol/L。
In the step 3), the volume ratio of the silver nitrate solution to the sodium chloride solution is 1: 1.
Compared with the prior art, the invention has the following outstanding characteristics and beneficial effects:
(1) according to the invention, the interface sewage treatment device Ag/AgCl/PDA/MF with a core-shell structure is prepared by sequentially modifying a Polydopamine (PDA) coating and Ag/AgCl nanoparticles on the surface of a purchased commercial melamine foam framework.
(2) The selected PDA coating and Ag/AgCl nano-particles have excellent light absorption performance, have higher light absorption performance in ultraviolet-visible-near infrared bands, have strong light-heat conversion capacity and achieve the solar energy-water vapor conversion rate of 87.8 percent.
(3) The selected Ag/AgCl nanoparticles have excellent photoactivity. Under the light excitation, it has good removal and degradation effect to pollutants such as VOCs, can effectively restrain the enrichment of pollutants such as VOCs in the condensate water.
Drawings
FIG. 1 shows X-ray diffraction spectra and Fourier infrared spectra of Ag/AgCl/PDA/MF, PDA/MF and MF. The X-ray diffraction spectra of Ag/AgCl/PDA/MF, PDA/MF and MF are shown in the diagram (A), and the Fourier infrared spectrum of the PDA particles is shown in the diagram (B).
FIG. 2 is a graph showing the light absorption and photo-thermal-vapor conversion properties of Ag/AgCl/PDA/MF, PDA/MF and MF. FIG. A shows UV-visible-near IR absorption spectra of Ag/AgCl/PDA/MF, and MF; the graph (B) shows the intensity at 1kW/m2The Ag/AgCl/PDA/MF physical image is irradiated by the simulated light source; the graph (C) shows the intensity at 1kW/m2The evaporation experimental diagram under the irradiation of the simulated light source; FIG. D is a graph showing the solar energy-water vapor conversion efficiency of the reactor.
FIG. 3 is a schematic diagram of a solar driven interface wastewater treatment system and performance of VOCs removal with phenol targeted contaminants. FIG. A is a schematic diagram of a solar driven interface wastewater treatment system; panel (B) shows VOCs removal performance (phenol targeted contaminants) for Ag/AgCl/PDA/MF, PDA/MF and MF.
Detailed Description
The invention is further described in detail by the following examples in conjunction with the accompanying drawings.
Example 1
A preparation method of a solar-driven interface sewage treatment device comprises the following steps:
sequentially adding the trihydroxymethyl aminomethane, dopamine hydrochloride, copper sulfate and hydrogen peroxide into 20mL of deionized water, stirring for 1h, and fully dissolving to obtain a mixed solution, wherein the concentration of the trihydroxymethyl aminomethane in the mixed solution is 50 multiplied by 10-3mol/L, the concentration of the hydrochloric acid dopamine is 8 multiplied by 10-3mol/L, the concentration of copper sulfate is 2X 10-3mol/L and a hydrogen peroxide concentration of 50X 10-3The mol/L ratio is higher than that of the total amount of the active carbon. The volume is 2X 2cm3The melamine foam of (2) was immersed in the above solution and allowed to stand for 6 hours. The product was removed, washed with deionized water and dried in an oven at 80 ℃. Soaking the dried product in silver nitrate solution for 2min, taking out, immediately placing in sodium chloride solution for 2min, and repeating the above operation for 20 times, wherein the concentration of silver nitrate solution is 1.5 × 10-3mol/L, concentration of sodium chloride solution is 1.5X 10-3mol/L, and the volume ratio of the silver nitrate solution to the sodium chloride solution is 1: 1. And (5) irradiating the obtained product for 2 hours under an ultraviolet lamp, and taking out the product. Washed with deionized water and dried in an oven at 80 ℃. To obtain Ag/AgCl/PDA/MF.
(1) Method of the invention treatment Process
Selecting phenol as a target VOCs pollutant, and preparing a phenol solution with the concentration of 5mg/L as a polluted water source; secondly, putting a certain amount of phenol solution into a quartz container to be used as a water source in the reaction; fixing the evaporator through polyethylene foam and floating on a water source; fourthly, the reactor is arranged in a water vapor collector with the light intensity of 1kW/m2Under the irradiation of the simulated light source, the reaction is carried out for 8 hours; and fifthly, after the reaction is finished, detecting the pollutant concentration of the collected condensed water.
(2) Effects obtained by this example
The X-ray diffraction spectrum and the Fourier infrared spectrum of the interface sewage treatment device are shown in figure 1. Panel (A) is an X-ray diffraction spectrum of Ag/AgCl/PDA/MF, PDA/MF and MF. It can be seen from the figure that there is no significant change in the diffraction peaks of PDA/MF and MF before and after modification of PDA. The diffraction peak at 2 θ ═ 23 ° is caused by the amorphous carbon structure. And after the Ag/AgCl particles are deposited, a new diffraction peak appears in the spectrogram of Ag/AgCl/PDA/MF. These diffraction peaks were assigned to cubic AgCl (JCPDS No.31-1238) and Ag (JCPDS No.65-2871), respectively, while others were not observed. The results confirm the successful synthesis of Ag/AgCl and the high purity of the samples. Panel (B) is a Fourier transform infrared spectrum of PDA particles. At 1591, 1491 and 1133cm-1The absorption peaks at (A) belong to the characteristic peaks of the N-H bending vibration and the C-N stretching vibration of the PDA respectively. For 2900 and 1039cm-1Respectively belonging to C-H asymmetric vibration and C-H in-plane bending vibration. The results confirm the successful preparation of PDA.
The light absorption and light-water vapor conversion performance of Ag/AgCl/PDA/MF is shown in FIG. 2. FIG. A shows UV-VISIBLE-NIR absorption spectra of Ag/AgCl/PDA/MF, PDA/MF and MF. Compared with MF, the light absorption of PDA/MF in the ultraviolet and visible light regions is obviously improved after the PDA coating is modified. After the Ag/AgCl particles are modified, the light absorption capacity of the Ag/AgCl/PDA/MF is further improved in visible and near-infrared light regions, and the Ag/AgCl/PDA/MF shows good light absorption performance in ultraviolet, visible and near-infrared light regions. The graph (B) shows the intensity at 1kW/m2Under the irradiation of a simulated light source of (1)gCl/PDA/MF physical map; the graph (C) shows the intensity at 1kW/m2The evaporation experimental diagram under the irradiation of the simulated light source; FIG. D is a diagram showing the solar energy-steam conversion efficiency of the wastewater treatment apparatus. The light intensity is 1kW/m2Under the irradiation of the simulated light source, the water evaporation rate of Ag/AgCl/PDA/MF reaches 2.04kg/m2The/h is far higher than that of PDA/MF, MF and processor-free systems. The above results confirm its excellent evaporation performance, and the solar-steam conversion efficiency reaches 87.8%.
A schematic of a solar driven interface wastewater processor and its removal of VOCs is shown in fig. 3. FIG. A is a schematic view of a solar driven interface sewage treatment system; panel (B) shows VOCs removal performance (phenol targeted contaminants) for Ag/AgCl/PDA/MF, PDA/MF and MF. To evaluate the VOCs removal performance of the wastewater treatment plant, the generated water vapor was collected by condensation through a trap. As can be seen, the phenol concentration in the collected water reached 4.3mg/L, which is much higher than that in the system without the treater (3.1mg/L), after the PDA/MF was used. After the Ag/AgCl particles are modified, the concentration of phenol in the collected water of the Ag/AgCl/PDA/MF system is reduced to 0.08 mg/L. The removal rate of the Ag/AgCl/PDA/MF system to phenol reaches 98.2%, which is far superior to other various systems. The result proves that the Ag/AgCl/PDA/MF sewage treatment device has good evaporation performance and VOCs removal performance.
Claims (10)
1. A preparation method of a solar-driven interface sewage processor is characterized by comprising the following steps:
1) adding trihydroxymethyl aminomethane, dopamine hydrochloride, copper sulfate and hydrogen peroxide into water, stirring, and fully dissolving to obtain a mixed solution;
2) dipping melamine foam into the mixed solution obtained in the step 1), standing for 3-9 h, taking out a product, washing, and drying in an oven at 60-100 ℃ to obtain polydopamine-modified melamine foam;
3) dipping the melamine foam modified by polydopamine in a silver nitrate solution for 1-4 min, taking out, immediately placing in a sodium chloride solution for 1-4 min, repeating the operation for 10-30 times, and depositing silver chloride on the foam obtained in the step 2) to obtain silver chloride/polydopamine/melamine foam;
4) and (4) placing the product treated in the step 3) under an ultraviolet lamp for irradiating for 1-4 hours, taking out the product, washing and drying to obtain the silver/silver chloride modified polydopamine/melamine foam which is used as a solar-driven interface sewage treatment device.
2. The method for preparing a solar-powered interface sewage treatment unit according to claim 1, wherein in the step 1), the concentration of tris (hydroxymethyl) aminomethane in the mixed solution is (30 to 80) x 10-3mol/L, the concentration of the dopamine hydrochloride is (5-11) multiplied by 10-3mol/L, the concentration of copper sulfate is (0.5-5) multiplied by 10-3mol/L and the concentration of hydrogen peroxide is (30-80) multiplied by 10-3mol/L。
3. The method for preparing the solar-driven interface sewage treatment device according to claim 1, wherein in the step 1), the stirring time is 0.5-2 h.
4. The method for preparing the solar-driven interface sewage treatment device according to claim 1, wherein in the step 2), the interface sewage treatment device is kept still for 5-7 hours.
5. The method for preparing the solar driven interface sewage processor of claim 1, wherein in the step 2), the washing is deionized water washing;
and (5) drying in an oven at 70-90 ℃.
6. The method for preparing a solar-powered interface sewage processor as claimed in claim 1, wherein in the step 3), the dried product is immersed in a silver nitrate solution for 1.5-2.5 min, taken out and immediately placed in a sodium chloride solution for 1.5-2.5 min, and the above operations are repeated 15-25 times.
7. The system of claim 1 wherein the interface is a solar powered sewage treatment plantThe preparation method is characterized in that in the step 3), the concentration of the silver nitrate solution is (0.5-2.0) multiplied by 10-3mol/L, the concentration of the sodium chloride solution is (0.5-2.0) multiplied by 10-3mol/L；
The volume ratio of the silver nitrate solution to the sodium chloride solution is 1: 0.5-1.5.
8. The preparation method of the solar-driven interface sewage treatment device according to claim 1, wherein in the step 4), the product treated in the step 3) is placed under an ultraviolet lamp for irradiation for 1.5-3 h.
9. The method for preparing the solar driven interface sewage processor as claimed in claim 1, wherein in the step 4), the washing is performed by using deionized water;
the drying conditions are as follows: and (5) drying in an oven at 70-90 ℃.
10. Use of the solar-powered interface wastewater treatment device prepared by the preparation method according to any one of claims 1 to 9 in solar-powered water purification.
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