CN111729670A - Preparation method of alpha-type bismuth trioxide magnetic nano photocatalyst - Google Patents
Preparation method of alpha-type bismuth trioxide magnetic nano photocatalyst Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 54
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- ZREIPSZUJIFJNP-UHFFFAOYSA-K bismuth subsalicylate Chemical compound C1=CC=C2O[Bi](O)OC(=O)C2=C1 ZREIPSZUJIFJNP-UHFFFAOYSA-K 0.000 claims abstract description 11
- 229960000782 bismuth subsalicylate Drugs 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 25
- 238000001035 drying Methods 0.000 claims description 10
- 239000007795 chemical reaction product Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 2
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- 230000001699 photocatalysis Effects 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000007146 photocatalysis Methods 0.000 abstract description 3
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 abstract 3
- 239000002904 solvent Substances 0.000 abstract 2
- 238000004729 solvothermal method Methods 0.000 abstract 2
- 235000019445 benzyl alcohol Nutrition 0.000 abstract 1
- 229910052797 bismuth Inorganic materials 0.000 abstract 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000004627 transmission electron microscopy Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910000416 bismuth oxide Inorganic materials 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000011858 nanopowder Substances 0.000 description 2
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- 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 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 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 1
- 229940012189 methyl orange Drugs 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [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 description 1
- 229940043267 rhodamine b Drugs 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B01J35/33—
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/843—Arsenic, antimony or bismuth
- B01J23/8437—Bismuth
-
- B01J35/39—
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- B01J35/40—
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- B01J35/50—
-
- B01J35/613—
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2305/08—Nanoparticles or nanotubes
-
- 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
-
- 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 relates to a preparation method of α type bismuth trioxide magnetic nano photocatalyst, which uses Co (NO)3)2·6H2O、Nd(NO3)2·6H2O and FeCl3·6H2O is taken as a raw material, benzyl alcohol is taken as a solvent, and Co is synthesized by a solvothermal method0.5Nd0.5Fe2O4Magnetic matrix, bismuth subsalicylate as bismuth source, ethylene glycol as solvent, and magnetic powderCoating Ni by solvothermal method0.6Zn0.4Fe2O4Compared with the prior art, the preparation method has simple process and simple and convenient operation, has high degradation rate and high utilization rate of a light source when the pollutants are degraded by photocatalysis, and is convenient to recycle.
Description
Technical Field
The invention relates to a preparation method of a photocatalyst material, in particular to a preparation method of an alpha-type bismuth trioxide magnetic nano photocatalyst.
Background
The nano bismuth oxide is relatively friendly to the environment, stable in chemical property, strong in absorption capacity to visible light and good in photocatalytic activity, and thus becomes a research hotspot of photocatalysts in recent years. In the photocatalytic degradation process of the nano bismuth trioxide photocatalyst, the contact area between the photocatalyst and a reaction substrate is increased, and the nano bismuth trioxide photocatalyst usually exists in a suspension or fixed form. In suspension state Bi2O3The nano powder has large specific surface area, good illuminated effect and high photocatalytic efficiency, but the catalyst particles are too fine, so the nano powder is easy to emulsify and difficult to separate and recycle in the reaction process of a stirred suspension system. Various immobilization methods have been tried by technologists at home and abroad, such as the use of Bi2O3The catalyst particles are supported on a carrier, or Bi is2O3The catalysts are formed as thin films, but the problem with them is that the catalyst contact surface area is relatively small and the photocatalytic efficiency is significantly lower than in a suspended system. The application of bismuth oxide in sewage treatment is seriously hindered.
Disclosure of Invention
The invention aims to solve the defects of the nano bismuth trioxide photocatalyst in the background technology and provides a preparation method of an alpha-type bismuth trioxide magnetic nano photocatalyst. When the bismuth trioxide photocatalyst prepared by the method is used for photocatalytic degradation of pollutants, the degradation rate and the utilization rate of a light source are high, and the bismuth trioxide photocatalyst is convenient to recycle.
The invention realizes the purpose through the following technical scheme:
a preparation method of an alpha-type bismuth trioxide magnetic nano photocatalyst comprises the following steps:
(1) preparation of Co0.5Nd0.5Fe2O4Magnetic matrix: according to the formula Co0.5Nd0.5Fe2O4Weighing Co (NO) at a certain ratio3)2·6H2O、Nd(NO3)2·6H2O and FeCl3·6H2O, adding the O into benzyl alcohol, uniformly dispersing by ultrasonic, transferring the obtained mixture to a hydrothermal reaction kettle for hydrothermal reaction to obtain a hydrothermal reaction product, cooling, centrifugally separating the hydrothermal reaction product, sequentially cleaning the obtained solid by deionized water and absolute ethyl alcohol, and finally drying to obtain black powder, namely Co0.5Nd0.5Fe2O4A magnetic substrate;
(2) preparing a magnetic nano photocatalyst: at room temperature, adding bismuth subsalicylate (C)7H5BiO4) Adding the mixture into ethylene glycol, adding Co prepared in the step (1) after ultrasonic dissolution0.5Nd0.5Fe2O4And (3) uniformly dispersing the magnetic matrix by ultrasonic, transferring the mixed solution into a hydrothermal reaction kettle for hydrothermal reaction, cooling, centrifugally separating a hydrothermal reaction product, sequentially cleaning the obtained solid by deionized water and absolute ethyl alcohol, and finally drying to obtain the α type bismuth trioxide magnetic nano photocatalyst.
Further, in the step (1), the temperature of the hydrothermal reaction is 200-230 ℃, and the time is 30-40 h.
Further, in the step (1), the drying temperature is 100-120 ℃.
Further, in the step (2), the ethylene glycol may be replaced with glycerin.
Further, in the step (2), Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to the bismuth subsalicylate is 0.5 (1-4).
Further, in the step (2), the temperature of the hydrothermal reaction is 170-190 ℃ and the time is 10-15 h.
Further, in the step (2), the drying temperature is 100-120 ℃.
The α type bismuth trioxide magnetic nano photocatalyst prepared by the invention is α type bismuth trioxide coated Co0.5Nd0.5Fe2O4The magnetic photocatalyst is α crystal bismuth oxide with tetragonal system, particle diameter of 20-30nm, and specific surface area of 50-90m2G, wherein the coating thickness of the α type bismuth trioxide is 9-18nm, the coercive force is 250.2Oe, and the saturation magnetization reaches 90.2emu g-1The remanent magnetization is 30.0emu g-1。
The invention has the beneficial effects that the invention is a preparation method of α type bismuth trioxide magnetic nano photocatalyst, compared with the prior art, the invention uses Co0.5Nd0.5Fe2O4As magnetic matrix, bismuth subsalicylate (C) is added7H5BiO4) The preparation method has simple process and simple and convenient operation, has high degradation rate and high utilization rate of a light source when the pollutants are degraded by photocatalysis, and is convenient to recycle.
Detailed Description
The technical scheme of the invention is further explained by combining the specific embodiment as follows:
example 1
A preparation method of an alpha-type bismuth trioxide magnetic nano photocatalyst comprises the following steps:
(1) preparation of Co0.5Nd0.5Fe2O4Magnetic matrix: according to the formula Co0.5Nd0.5Fe2O4In the (Co: Nd: Fe ═ 1:1:4) ratio, 0.01molCo (NO) was weighed3)2·6H2O、0.01molNd(NO3)2·6H2O and 0.04mol FeCl3·6H2O, adding into 80ml of benzyl alcoholAfter the uniform ultrasonic dispersion, transferring the obtained mixture into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 210 ℃ for 36h to obtain a hydrothermal reaction product, cooling, carrying out centrifugal separation on the hydrothermal reaction product, sequentially washing the obtained solid with deionized water and absolute ethyl alcohol, and finally drying at 100 ℃ to obtain black powder, namely Co0.5Nd0.5Fe2O4A magnetic substrate;
(2) preparing a magnetic nano photocatalyst:
at room temperature, adding bismuth subsalicylate (C)7H5BiO4) Adding the mixture into ethylene glycol, adding Co prepared in the step (1) after ultrasonic dissolution0.5Nd0.5Fe2O4Magnetic matrix, Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to bismuth subsalicylate is 0.5:1 (namely Fe: Bi is 1:1), the mixture is transferred to a hydrothermal reaction kettle after uniform ultrasonic dispersion, hydrothermal reaction is carried out for 12 hours at 180 ℃, the hydrothermal reaction product is centrifugally separated after cooling, the obtained solid is sequentially washed by deionized water and absolute ethyl alcohol, and finally drying is carried out at 100 ℃ to obtain the α type bismuth trioxide magnetic nano photocatalyst.
The prepared magnetic photocatalyst was tested by Transmission Electron Microscopy (TEM), and it was found that the particle size of the nano photocatalyst prepared in this example was 23nm and the coating thickness of the alpha bismuth trioxide was 9 nm.
The prepared magnetic photocatalyst is tested by a physical adsorption instrument, and the specific surface area of the nano photocatalyst prepared in the embodiment is found to be 50m2·g。
The magnetic property of the nano photocatalyst prepared in this example was measured by a Vibrating Sample Magnetometer (VSM), and the results were: the coercive force is 250.2Oe, and the saturation magnetization reaches 90.2 emu.g-1The remanent magnetization is 30.0emu g-1。
Example 2
In the step (2), Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to bismuth subsalicylate was 0.5:2 (i.e., Fe: Bi ═ 1:2), and the rest was the same as in example 1, to prepare α type bismuth trioxide magnetic nanophotocatalyst.
The prepared magnetic photocatalyst was tested by Transmission Electron Microscopy (TEM), and it was found that the particle size of the nano photocatalyst prepared in this example was 26nm and the coating thickness of the alpha bismuth trioxide was 11 nm.
The prepared magnetic photocatalyst is tested by a physical adsorption instrument, and the specific surface area of the nano photocatalyst prepared in the embodiment is 60m2·g。
The magnetic property of the nano photocatalyst prepared in this example was measured by a Vibrating Sample Magnetometer (VSM), and the results were: the coercive force is 250.5Oe, and the saturation magnetization reaches 90.2 emu.g-1The remanent magnetization is 30.0emu g-1。
Example 3
In the step (2), Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to bismuth subsalicylate was 0.5:3 (i.e., Fe: Bi ═ 1:3), and the rest was the same as in example 1, to prepare α type bismuth trioxide magnetic nanophotocatalyst.
The prepared magnetic photocatalyst was tested by a Transmission Electron Microscope (TEM), and it was found that the particle size of the nano photocatalyst prepared in this example was 24nm and the coating thickness of the alpha-type bismuth trioxide was 14 nm.
The prepared magnetic photocatalyst is tested by a physical adsorption instrument, and the specific surface area of the nano photocatalyst prepared in the embodiment is 90m2·g。
The magnetic property of the nano photocatalyst prepared in this example was measured by a Vibrating Sample Magnetometer (VSM), and the results were: the coercive force is 248.5Oe, and the saturation magnetization reaches 93.2 emu.g-1The remanent magnetization is 30.0emu g-1。
Example 4
In the step (2), Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to bismuth subsalicylate was 0.5:4 (i.e., Fe: Bi ═ 1:4), and the rest was the same as in example 1, to prepare α type bismuth trioxide magnetic nanophotocatalyst.
The prepared magnetic photocatalyst was tested by Transmission Electron Microscopy (TEM), and it was found that the nano photocatalyst prepared in this example had a particle size of 30nm and a coating thickness of 18nm for alpha bismuth trioxide.
The prepared magnetic photocatalyst is tested by a physical adsorption instrument, and the specific surface area of the nano photocatalyst prepared in the embodiment is 60m2·g。
The magnetic property of the nano photocatalyst prepared in this example was measured by a Vibrating Sample Magnetometer (VSM), and the results were: the coercive force is 248.5Oe, and the saturation magnetization reaches 93.2 emu.g-1The remanent magnetization is 30.0emu g-1。
Application test:
the experimental method comprises the following steps: adding Bi2O3Respectively loaded on a conventional catalyst carrier Al2O3、SiO2SBA-15 to obtain the photocatalyst Bi2O3/Al2O3、Bi2O3/SiO2And Bi2O3SBA-15, the nano-photocatalyst and photocatalyst Bi obtained in examples 1-4 were subjected to xenon lamp (with filter to remove wavelengths below 420 nm) under visible light2O3/Al2O3、Bi2O3/SiO2And Bi2O3SBA-15 performs the degradation of typical azo dyes methyl orange, methylene blue and rhodamine-B simulated wastewater. The test conditions were 50 mg of catalyst, 20ppm of simulated wastewater and 100 ml of wastewater solution, and the commercial catalyst P25-TiO was used2The performance comparison was performed, and the results of the degradation rate test after 3 hours of illumination are shown in table 1:
TABLE 1
As can be seen from the data in Table 1, the α -type bismuth trioxide magnetic nano-photocatalyst prepared by the embodiment of the invention has excellent degradation rate when the pollutant is degraded by photocatalysis.
Claims (6)
1. A preparation method of an alpha-type bismuth trioxide magnetic nano photocatalyst is characterized by comprising the following steps:
(1) preparation of Co0.5Nd0.5Fe2O4Magnetic matrix: according to the formula Co0.5Nd0.5Fe2O4Weighing Co (NO) at a certain ratio3)2·6H2O、Nd(NO3)2·6H2O and FeCl3·6H2O, adding the O into benzyl alcohol, uniformly dispersing by ultrasonic, transferring the obtained mixture to a hydrothermal reaction kettle for hydrothermal reaction to obtain a hydrothermal reaction product, cooling, centrifugally separating the hydrothermal reaction product, sequentially cleaning the obtained solid by deionized water and absolute ethyl alcohol, and finally drying to obtain black powder, namely Co0.5Nd0.5Fe2O4A magnetic substrate;
(2) preparing a magnetic nano photocatalyst: adding bismuth subsalicylate into ethylene glycol at room temperature, adding Co prepared in the step (1) after ultrasonic dissolution0.5Nd0.5Fe2O4And (3) uniformly dispersing the magnetic matrix by ultrasonic, transferring the mixed solution into a hydrothermal reaction kettle for hydrothermal reaction, cooling, centrifugally separating a hydrothermal reaction product, sequentially cleaning the obtained solid by deionized water and absolute ethyl alcohol, and finally drying to obtain the α type bismuth trioxide magnetic nano photocatalyst.
2. The method for preparing the α -bismuth trioxide magnetic nano-photocatalyst as claimed in claim 1, wherein in the step (1), the hydrothermal reaction is carried out at a temperature of 200 ℃ and 230 ℃ for 30-40 h.
3. The method for preparing the α -bismuth trioxide magnetic nano-photocatalyst as claimed in claim 1, wherein in the step (1), the drying temperature is 100-120 ℃.
4. The preparation method of α -type bismuth trioxide magnetic nano-photocatalyst as claimed in claim 1, wherein in the step (2), Co0.5Nd0.5Fe2O4The molar ratio of the magnetic matrix to the bismuth subsalicylate is 0.5 (1-4).
5. The method for preparing the α -bismuth trioxide magnetic nano-photocatalyst as claimed in claim 1, wherein in the step (2), the temperature of the hydrothermal reaction is 170-190 ℃ and the time is 10-15 h.
6. The method for preparing the α -type bismuth trioxide magnetic nano-photocatalyst as claimed in any one of claims 1 to 5, wherein in the step (2), the drying temperature is 100-120 ℃.
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|---|---|---|---|---|
| US5190740A (en) * | 1990-06-21 | 1993-03-02 | Kawasaki Steel Corporation | Method producing composite oxides for use as starting materials for producing ferrites |
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