CN111558384A - 2D/2D heterojunction piezoelectric-photocatalyst and preparation method thereof - Google Patents
2D/2D heterojunction piezoelectric-photocatalyst and preparation method thereof Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910003378 NaNbO3 Inorganic materials 0.000 claims abstract description 31
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 21
- 239000002135 nanosheet Substances 0.000 claims abstract description 21
- 229910052961 molybdenite Inorganic materials 0.000 claims abstract description 20
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- MUPJWXCPTRQOKY-UHFFFAOYSA-N sodium;niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Na+].[Nb+5] MUPJWXCPTRQOKY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 14
- 230000002195 synergetic effect Effects 0.000 claims abstract description 9
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 6
- 239000002052 molecular layer Substances 0.000 claims abstract description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 27
- 239000000243 solution Substances 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 15
- 239000004809 Teflon Substances 0.000 claims description 14
- 229920006362 Teflon® Polymers 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 9
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 9
- 235000006408 oxalic acid Nutrition 0.000 claims description 9
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 9
- 239000011684 sodium molybdate Substances 0.000 claims description 9
- 235000015393 sodium molybdate Nutrition 0.000 claims description 9
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 230000005684 electric field Effects 0.000 abstract description 5
- 230000001699 photocatalysis Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002114 nanocomposite Substances 0.000 abstract 1
- 238000005067 remediation Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 description 19
- 230000015556 catabolic process Effects 0.000 description 18
- 230000003197 catalytic effect Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 5
- 230000010287 polarization Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- B01J35/39—
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- 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
- B01J27/047—Sulfides with chromium, molybdenum, tungsten or polonium
- B01J27/051—Molybdenum
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention discloses a 2D/2D heterojunction piezoelectric-photocatalyst and a preparation method thereof, wherein the photocatalyst is prepared from piezoelectric NaNbO3Nanosheet and MoS2Nano-layer composition, and adopts simple two-step hydrothermal synthesis of NaNbO3/MoS2Heterojunction piezo-photocatalysts. 2D/2D nano NaNbO3/MoS2The heterojunction can collect fine vibration energy in the environment through the piezoelectric effect to induce the surface to generate electron hole pairs, so that the decomposition of organic pollutants is driven; in addition, due to the synergistic effect of the formation of the heterojunction and the built-in electric field caused by mechanical vibration, the charges are effectively separated, the photocatalytic activity is effectively enhanced, and therefore the synchronous collection and utilization of the mechanical vibration energy and the visible light are realized. Such asThe design of the 2D piezoelectric material-based nano composite material breaks through the limitation of using a single piezoelectric material as a catalyst, realizes the high-efficiency coupling utilization of mechanical vibration and visible light, provides a new approach for environmental remediation and renewable energy production, and is simple in preparation method and suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of catalytic materials, in particular to a 2D/2D heterojunction photocatalyst and a preparation method thereof.
Background
Due to the growing world population and the rapid development of industry, the need for environmental protection is increasing. Water-soluble organic dye contaminants are highly stable and are particularly difficult to handle, leading to serious health and environmental problems. In order to solve this serious problem, there is an urgent need to develop an environmentally friendly, convenient, and inexpensive technology for degrading organic pollutants. In recent years, polarization using piezoelectric nanomaterials is considered to be an effective method for improving photocatalytic degradation efficiency. The separation of the photogenerated electrons and the holes can be effectively promoted by the introduction of the built-in electric field. In addition, the polarization of the piezoelectric material caused by the stress induced by mechanical vibration, i.e., the piezoelectric effect, can be used as a driving force for the catalytic degradation of organic pollutants in dark environments. For example, Hong, et al demonstrated in piezoelectric BaTiO3In the presence of crystallites, an aqueous solution of lime 7(AO7) can be degraded by ultrasonic vibration. (a new mechanical for azo dye dissolution in aqueous solution of microwave in journal of physical Chemistry C,2012,116(24): 13045-. Compared with the existing electrocatalysis technology, the piezoelectric catalyst has the advantages of utilizing the mechanical vibration which is ubiquitous in the environment and reducing the dependence on electric power conditions.
One of the most important problems hindering the industrial application of photocatalysts is the low photocatalytic efficiency caused by the annihilation of the photo-generated electron-hole pairs, and researchers have adopted many strategies: strategies such as doping, building heterojunctions, co-catalyst loading, and designing nanostructures overcome this limitation. However, the photocatalytic activity of the currently developed catalyst is still far from satisfactory, and therefore, it is still absolutely necessary to find an effective way for improving the catalytic performance by inhibiting the recombination of photo-generated electron-hole pairs and collecting the environmental fine vibration energy for catalysisWhat is needed is that. The built-in electric field (ion displacement of piezoelectric material caused by intrinsic or strain) in the piezoelectric material is used for spatially separating photo-generated electron-hole pairs generated by visible light, thereby improving the catalytic activity (synthetic catalytic activity of BiFeO)3/TiO2core-shell nanocompositesfor degradation of organic dye molecule through piezophototronic effect.Nanoenergy,2019,56:74-81)。
The invention designs and prepares NaNbO3Nanosheet and MoS2Novel NaNbO composed of nanosheets3/MoS2Heterostructure piezo-photocatalysts. In one aspect, NaNbO3A built-in electric field generated by spontaneous polarization of the nanosheets provides a driving force for effectively separating electron hole pairs; on the other hand, the molybdenum disulfide nanosheet can be used as a cocatalyst to improve the pressure-photocatalytic activity due to the high conductivity and abundant active edge sites. From this, the novel nano NaNbO3/MoS2The heterojunction can realize high-efficiency degradation of organic pollutants (the reaction rate constant is higher than k 10-50 × 10)-3min-1)。
Disclosure of Invention
The invention aims to solve the problems that: the 2D/2D heterojunction voltage-photocatalyst and the preparation method thereof are provided, the piezoelectric effect enhances the photocatalytic effect, and the efficient degradation of organic pollutants is realized.
The technical scheme provided by the invention for solving the problems is as follows: A2D/2D heterojunction piezoelectric-photocatalyst comprises NaNbO3Nanosheet and MoS2A nanolayer.
A method for preparing a 2D/2D heterojunction-photocatalyst comprises the following steps,
1) weighing a predetermined amount of Nb2O5Dispersing sodium dodecyl benzene sulfonate in mineralizer, stirring, transferring the solution to Teflon stainless steel high pressure kettle, hydrothermal reaction at specific temperature, cooling, washing and drying to obtain NaNbO3Nanosheets;
2) dissolving quantitative sodium molybdate and thiourea in oxalic acid solution, stirring, and adding a certain amount of NaNbO3Nano-sheet powder, transferring the above-mentioned solution into teflon stainless steel high-pressure kettle, then making reaction at specific temperature, cooling, cleaning and drying so as to obtain the NaNbO3/MoS2Press-photocatalyst.
Preferably, Nb in step 1) is2O5And sodium dodecylbenzenesulfonate 0.5g and 0.02g, respectively, and mineralizer KOH and NaOH in K+:Na+The volume of the mineralizer is 80ml of the mixed solution composed of the proportion of 2:1 and the concentration of 0.5 mol/L-2 mol/L.
Preferably, the stirring time in the step 1) is 0.5h to 1.5h, and the volume of the autoclave is 100 ml.
Preferably, the hydrothermal reaction temperature in the step 1) is 180-220 ℃, and the reaction time is 6-24 h.
Preferably, the cleaning solution in the step 1) is deionized water, and the drying temperature is 60-90 ℃.
Preferably, the mass of the sodium molybdate and the thiourea in the step 2) is 0.065g and 0.13g respectively, and the concentration of the oxalic acid solution is 0.075 mol/L.
Preferably, the NaNbO added in the step 2)3The mass of (b) is 10%, 25%, 40% of the total mass.
Preferably, the 2D/2D heterojunction voltage-photocatalyst can efficiently decompose organic pollutants under the synergistic drive of ultrasonic waves and visible light, and the concentration of the catalyst is 0.05-0.5 mg/L.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts a two-step hydrothermal method to prepare NaNbO3/MoS2The preparation method of the heterojunction piezoelectric-photocatalyst is simple and is suitable for industrial production.
(2) The invention overcomes the limitation of low catalytic efficiency of a single piezoelectric material, the obtained heterojunction has obvious catalytic activity on the degradation of organic pollutants, and the optimal degradation reaction rate constant k reaches 39.27 × 10-3min-1About 2 times the single voltage and the photocatalysis.
(3) The NaNbO prepared by the invention3/MoS2The heterojunction can be significantly enhancedThe built-in electric field promotes efficient separation of electrons and holes.
In conclusion, the NaNbO prepared by the invention3/MoS2The heterojunction voltage-photocatalyst breaks through the limitation of single vibration and photocatalyst, realizes the high-efficiency utilization of fine vibration and light energy, provides a new way for the synergistic catalytic degradation of organic pollutants by utilizing the piezoelectric-optical effect, has wide application prospect, is simple in preparation method, and is suitable for industrial production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 shows NaNbO3，NaNbO3/MoS2-25％，MoS2XRD pattern of (a).
FIG. 2 is a graph showing the ultraviolet absorption spectrum and the degradation effect of example 5.
FIG. 3 is NaNbO3/MoS225% degradation effect catalyzed by light (a), piezo-electricity (b) and piezo-light in combination (c), respectively.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1:
1) weigh 0.5g of Nb2O5And 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH in K+:Na+To a mineralizer solution (0.5mol/L) having a ratio of 2:1, stirred for 1h, transferred to a teflon stainless steel autoclave (100ml), and then heated at 200 ℃ for 10 h. Cooling, washing the white precipitate with deionized water, and drying at 80 deg.C to obtain NaNbO3Nanosheets.
2) 0.065g of sodium molybdate and 0.130g of thiourea were weighed into 20mL of oxalic acid solution (0.075mol/L) and stirred magnetically for 0.5h10% by mass of NaNbO3The nanosheet powder was added to the above solution, stirred for 1h, then transferred to a 100ml teflon autoclave and heated at 200 ℃ for 24 h. Cooling to room temperature, washing with deionized water for several times, and drying at 60 ℃ for 12h to obtain the NaNbO3/MoS2A piezoelectric catalyst.
3) The concentration of the catalyst is 0.05mg/L, so that the piezoelectric-photocatalytic synergistic degradation of organic pollutants is realized, and the efficient degradation is realized (the reaction rate constant k is 10 × 10)-3min-1)。
Example 2:
1) weigh 0.5g of Nb2O5And 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH in K+:Na+To a mineralizer solution (0.5mol/L) having a ratio of 2:1, stirred for 1h, transferred to a teflon stainless steel autoclave (100ml), and then heated at 200 ℃ for 10 h. Cooling, washing the white precipitate with deionized water, and drying at 80 deg.C to obtain NaNbO3Nanosheets.
2) 0.065g of sodium molybdate and 0.130g of thiourea were weighed into 20mL of oxalic acid solution (0.075mol/L), and the solution was magnetically stirred for 1h to obtain 10% by mass of NaNbO3The nanosheet powder was added to the above solution, stirred for 1h, then transferred to a 100ml teflon autoclave and heated at 200 ℃ for 24 h. Cooling to room temperature, washing with deionized water for several times, and drying at 60 ℃ for 12h to obtain the NaNbO3/MoS2A piezoelectric catalyst.
3) The concentration of the catalyst is 0.1mg/L, so that the piezoelectric-photocatalytic synergetic degradation of organic pollutants is realized, and the efficient degradation is realized (the reaction rate constant k is 20.20 × 10)-3min-1)。
Example 3:
1) weigh 0.5g of Nb2O5And 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH in K+:Na+To a mineralizer solution (0.5mol/L) having a composition of 2:1, stirred for 1h, transferred to a teflon stainless steel autoclave (100ml), and then heated at 210 ℃ for 6 h. After cooling, the white precipitate was washed with deionized water, and then at 80 ℃Drying to obtain NaNbO3Nanosheets.
2) 0.065g of sodium molybdate and 0.130g of thiourea were weighed and dissolved in 20mL of oxalic acid solution (0.075mol/L), magnetically stirred for 1h, NaNbO3 nanosheet powder with a total mass of 40% was added to the solution, stirred for 1h, then transferred to a 100mL Teflon autoclave, and heated at 200 ℃ for 24 h. Cooling to room temperature, washing with deionized water for several times, and drying at 60 ℃ for 12h to obtain the NaNbO3/MoS2A piezoelectric catalyst.
3) The concentration of the catalyst is 0.1mg/L, so that the piezoelectric-photocatalytic synergetic degradation of organic pollutants is realized, and the high-efficiency degradation is realized (the reaction rate constant k is 23.45 × 10)-3min-1)。
Example 4:
1) weigh 0.5g of Nb2O5And 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH in K+:Na+To a mineralizer solution (0.5mol/L) having a composition of 2:1, stirred for 1h, transferred to a teflon stainless steel autoclave (100ml), and then heated at 210 ℃ for 6 h. Cooling, washing the white precipitate with deionized water, and drying at 80 deg.C to obtain NaNbO3Nanosheets.
2) 0.065g of sodium molybdate and 0.130g of thiourea were weighed into 20mL of oxalic acid solution (0.075mol/L) and stirred magnetically for 1h to obtain 40% of NaNbO in total mass3The nanosheet powder was added to the above solution, stirred for 1.5h, then transferred to a 100ml teflon autoclave and heated at 210 ℃ for 24 h. Cooling to room temperature, washing with deionized water for several times, and drying at 60 ℃ for 10h to obtain the NaNbO3/MoS2A piezoelectric catalyst.
3) The concentration of the catalyst is 0.4mg/L, so that the piezoelectric-photocatalytic synergetic degradation of organic pollutants is realized, and the efficient degradation is realized (the reaction rate constant k is 28.22 × 10)-3min-1)。
Example 5:
1) weigh 0.5g of Nb2O5And 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH in K+:Na+Mineralizing agent solution with 2:1 ratio(0.5mol/L), stirred for 1h, transferred to a Teflon stainless steel autoclave (100ml), and then heated at 210 ℃ for 6 h. Cooling, washing the white precipitate with deionized water, and drying at 80 deg.C to obtain NaNbO3Nanosheets.
2) 0.065g of sodium molybdate and 0.130g of thiourea were weighed into 20mL of oxalic acid solution (0.075mol/L) and stirred magnetically for 1h to obtain 25% of NaNbO in total mass3The nanosheet powder was added to the above solution, stirred for 1.5h, then transferred to a 100ml teflon autoclave and heated at 210 ℃ for 24 h. Cooling to room temperature, washing with deionized water for several times, and drying at 60 ℃ for 10h to obtain the NaNbO3/MoS2A piezoelectric catalyst.
3) The concentration of the catalyst is 0.2mg/L, so that the piezoelectric-photocatalytic synergetic degradation of organic pollutants is realized, and the high-efficiency degradation is realized (the reaction rate constant k is 39.27 × 10)-3min-1)。
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (9)
1. A2D/2D heterojunction piezoelectric-photocatalyst is characterized in that: comprising NaNbO3Nanosheet and MoS2A nanolayer.
2. A preparation method of a 2D/2D heterojunction piezoelectric-photocatalyst is characterized by comprising the following steps: the method comprises the following steps of,
1) weighing a predetermined amount of Nb2O5Dispersing sodium dodecyl benzene sulfonate in mineralizer, stirring, transferring the solution to Teflon stainless steel high pressure kettle, hydrothermal reaction at specific temperature, cooling, washing and drying to obtain NaNbO3Nanosheets;
2) dissolving quantitative sodium molybdate and thiourea in oxalic acid solution, stirring, and adding a certain amount of NaNbO3Nanosheet powderTransferring the solution to a Teflon stainless steel autoclave, then reacting at a specific temperature, cooling, cleaning and drying to prepare the NaNbO3/MoS2Press-photocatalyst.
3. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: nb in the step 1)2O5And sodium dodecylbenzenesulfonate 0.5g and 0.02g, respectively, and mineralizer KOH and NaOH in K+:Na+The volume of the mineralizer is 80ml of the mixed solution composed of the proportion of 2:1 and the concentration of 0.5 mol/L-2 mol/L.
4. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: the stirring time in the step 1) is 0.5-1.5 h, and the volume of the autoclave is 100 ml.
5. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: the hydrothermal reaction temperature in the step 1) is 180-220 ℃, and the reaction time is 6-24 h.
6. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: the cleaning solution in the step 1) is deionized water, and the drying temperature is 60-90 ℃.
7. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: in the step 2), the mass of the sodium molybdate and the mass of the thiourea are respectively 0.065g and 0.13g, and the concentration of the oxalic acid solution is 0.075 mol/L.
8. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: the NaNbO added in the step 2)3The mass of (b) is 10%, 25%, 40% of the total mass.
9. The method for preparing a 2D/2D heterojunction piezo-photocatalyst as claimed in claim 2, wherein: the 2D/2D heterojunction voltage-photocatalyst can efficiently decompose organic pollutants under the synergistic drive of ultrasonic waves and visible light, and the concentration of the catalyst is 0.05-0.5 mg/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112811894A (en) * | 2021-01-28 | 2021-05-18 | 苏州金宏气体股份有限公司 | p-n-ZnO/Cu2S heterojunction piezoelectric ceramic, preparation method thereof and application of S heterojunction piezoelectric ceramic in self-powered efficient hydrogen production |
| CN112898019A (en) * | 2021-01-28 | 2021-06-04 | 苏州金宏气体股份有限公司 | p-n-KNbO3/Cu2S heterojunction piezoelectric ceramic, preparation method thereof and application of S heterojunction piezoelectric ceramic in self-powered efficient hydrogen production |
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