CN117160493A - CdSe/KTaO 3 Preparation method and application of composite photocatalyst - Google Patents
CdSe/KTaO 3 Preparation method and application of composite photocatalyst Download PDFInfo
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- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 59
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000001257 hydrogen Substances 0.000 claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 16
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 16
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 14
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 43
- 239000000725 suspension Substances 0.000 claims description 10
- 239000007795 chemical reaction product Substances 0.000 claims description 8
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- 239000000047 product Substances 0.000 claims description 8
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- 238000000227 grinding Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
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- 238000004140 cleaning Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
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- 239000012456 homogeneous solution Substances 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 16
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- 239000000463 material Substances 0.000 abstract description 6
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000006303 photolysis reaction Methods 0.000 description 3
- 230000015843 photosynthesis, light reaction Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 230000004298 light response Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
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- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention discloses a CdSe/KTaO 3 A preparation method and application of a composite photocatalyst relate to the technical field of photocatalytic materials. The preparation method comprises the following steps: firstly, preparing KTaO by adopting a hydrothermal method 3 Then Se powder and Na 2 SO 3 Dissolving in deionized water, and adding KTaO 3 Performing ultrasonic treatment, and adding CdCl after the treatment 2 The solution is treated by ultrasonic treatment and stirring, and the CdSe/KTaO is finally obtained after the reaction is finished 3 A composite photocatalyst. The invention prepares CdSe/KTaO 3 Heterojunction photocatalysisThe material greatly improves the photocatalytic hydrogen production activity and solves the problem of KTaO in the prior art 3 The photocatalyst has the advantages of low hydrogen production efficiency, simple preparation process, easily controlled experimental conditions, low cost, safety and reliability.
Description
Technical Field
The invention relates to the technical field of photocatalytic materials, in particular to a CdSe/KTaO 3 A preparation method and application of a composite photocatalyst.
Background
With the continuous development of the age, the continuous increase of petrochemical fuel consumption brings serious pollution to the environment, and more importantly, the petrochemical fuel belongs to non-renewable energy sources and is not inexhaustible. Under the dual pressures of environmental pollution and energy crisis, researchers are working to find new renewable and environmentally friendly energy sources, such as hydrogen energy sources; however, the industrial hydrogen production mainly depends on coal and natural gas reforming, but the coal and the natural gas are non-renewable energy sources, so that the consumption of the non-renewable energy sources is aggravated and the environmental pollution is brought in the current industrial hydrogen production process. Solar energy is used as inexhaustible renewable energy, and can be converted into clean and efficient hydrogen energy through a photocatalysis process, so that the solar energy is an ideal way for solving the problems.
KTaO 3 Is a typical perovskite oxide, has the advantages of proper energy band position, excellent chemical stability, low price, no toxicity and the like, and has great application potential in the field of photocatalytic hydrogen production. But KTaO 3 The band gap width (about 3.6 eV) of the solar energy collector is larger, the solar energy collector can only absorb ultraviolet light, and the solar energy collector accounts for about 4% of sunlight, so that the solar energy utilization rate is lower; in addition, a single KTaO 3 Quantum efficiency is also low. These defects limit KTaO 3 The method is applied to the aspect of hydrogen production by sunlight. Research has found that KTaO 3 Can be compounded with a narrow-band gap photocatalyst to improve KTaO 3 The photoresponse range and quantum efficiency of the photocatalytic material.
CdSe is a narrow bandgap semiconductor (-2.0 eV) with excellent visible light response capability among many nanomaterials. However, the light of pure CdSe catalystThe electron-hole pair recombination rate is high, and the photocatalytic hydrogen production performance is not ideal. But due to its energy band structure and KTaO 3 After the two semiconductors are coupled together, the photo-generated carriers can be transported and separated between the two semiconductors with different band gaps, and the recombination rate of photo-generated electron hole pairs is reduced. Thus, KTaO 3 The heterojunction formed by the compound with CdSe can effectively avoid respective defects, the required energy is lower, the light absorption range can be enlarged, and the photocatalytic hydrogen production effect is improved. Thus, the present invention provides a CdSe/KTaO 3 A preparation method and application of a composite photocatalyst.
Disclosure of Invention
The invention aims to provide a CdSe/KTaO 3 Preparation method and application of composite photocatalyst, and CdSe nano particles are uniformly coated on KTaO 3 CdSe/KTaO is prepared on the surface of the nanometer cube 3 Composite photocatalyst for widening KTaO 3 The light absorption range of the catalyst promotes the separation and migration of photo-generated electron hole pairs, and has obviously enhanced activity of photo-catalytically decomposing water to produce hydrogen.
To achieve the above object, the present invention provides a CdSe/KTaO 3 Preparation method of composite photocatalyst, uniformly loading CdSe nano particles on KTaO 3 The nano cubic block surface comprises the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s3, KTaO is taken 3 Adding Na into the nano cubic block 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then CdCl is added 2 Slowly dripping the solution into the mixed solution, continuing ultrasonic treatment and stirring treatment, finally cleaning and collecting the reaction product, and vacuum drying and grinding to obtain CdSe/KTaO 3 A composite photocatalyst.
Preferably, the step S1 prepares KTaO by a hydrothermal method 3 The specific steps of the nano cube are as follows:
s1-1, 25mL of KOH aqueous solution having a concentration of 15mol/L was prepared, and then 2.5mmolTa was added 2 O 5 Dispersing in KOH solution, magnetically stirring for 1 hour to obtain suspension;
s1-2, transferring the suspension prepared in the S1-1 into a polytetrafluoroethylene lining reaction kettle for reaction, collecting a product after the reaction is finished into a forced air drying box for drying to obtain KTaO 3 Nano cubes.
Preferably, in the step S1-2, the reaction temperature in the reaction kettle is 150 ℃ and the reaction time is 5 hours; the temperature in the forced air drying oven was 70℃and dried for 12 hours.
Preferably, in the step S2, na is prepared 2 SeSO 3 The specific operation of the solution is as follows: se powder and Na 2 SO 3 Adding the powder into deionized water, and then reacting in an oil bath to obtain Na 2 SeSO 3 Solution of Se powder and Na 2 SO 3 The ratio of the amounts of the substances of the powder was 1:6.
Preferably, in the step S2, cdCl is prepared 2 The specific operation of the solution is as follows: cdCl is reacted with 2 Adding the powder into deionized water, stirring to dissolve completely to obtain CdCl 2 Homogeneous solution of Se powder and CdCl 2 The ratio of the amounts of the substances of the powder was 15:11.
Preferably, in the step S3, KTaO 3 The mass of the nano cube is 0.047-0.421 g.
Preferably, in the step S3, the reaction product is centrifugally washed by deionized water and absolute ethyl alcohol, vacuum dried for 12 hours at 60 ℃, and ground to obtain CdSe/KTaO 3 A composite photocatalyst.
CdSe/KTaO prepared by the preparation method 3 Composite photocatalyst, the CdSe/KTaO 3 CdSe and KTaO in composite photocatalyst 3 The mass ratio of (2) is one of 5:5, 7:3 or 9:1.
CdSe/KTaO prepared by the preparation method 3 The application of the composite photocatalyst in hydrogen production.
Compared with the prior art, the invention has the following beneficial effects:
(1) Uniformly wrapping CdSe nano particles on KTaO 3 Nanometer scaleThe surface of the cube block widens KTa O 3 Promotes the separation and migration of photo-generated electron-hole pairs, and the prepared CdSe/KTaO 3 The composite photocatalyst has a higher CdSe and KTaO than those of CdSe and KTaO 3 Is a photocatalytic activity of (a);
(2) The preparation method is simple, the experimental conditions are easy to control, the cost is low, and the safety and the reliability are realized;
(3) The prepared CdSe/KTaO 3 The composite photocatalyst has good application prospect and industrialization prospect in the field of photolysis of water to produce hydrogen.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is pure KTaO 3 Photocatalyst, pure CdSe photocatalyst and CdSe/KTaO with different proportions prepared by the invention 3 An X-ray diffraction pattern (XRD) pattern of the composite photocatalyst;
FIG. 2 is pure KTaO 3 Photocatalyst, pure CdSe photocatalyst and CdSe/KTaO prepared by the method 3 Scanning electron microscope topography of the composite photocatalyst; wherein (a) is pure KTaO 3 Photocatalyst, (b) pure CdSe photocatalyst, (c) CdSe/KTaO 3 A composite photocatalyst;
FIG. 3 is pure KTaO 3 Photocatalyst, pure CdSe photocatalyst and CdSe/KTaO with different proportions prepared by the invention 3 A comparative graph of the hydrogen production activity by the photolysis water of the composite photocatalyst; wherein, (a) is a hydrogen production amount comparison chart; (b) is a hydrogen production rate comparison chart.
Detailed Description
The following detailed description of the embodiments of the invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a CdSe/KTaO 3 Preparation method of composite photocatalyst, uniformly loading CdSe nano particles on KTaO 3 The nano cubic block surface comprises the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s3, KTaO is taken 3 Adding Na into the nano cubic block 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then CdCl is added 2 Slowly dripping the solution into the mixed solution, continuing ultrasonic treatment and stirring treatment, finally cleaning and collecting the reaction product, and vacuum drying and grinding to obtain CdSe/KTaO 3 A composite photocatalyst.
Example 1
CdSe/KTaO 3 The preparation method of the composite photocatalyst comprises the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s1-1, 25mL of KOH aqueous solution having a concentration of 15mol/L was prepared, and then 2.5mmolTa was added 2 O 5 Dispersing in KOH solution, magnetically stirring for 1 hour to obtain suspension;
s1-1, transferring the suspension prepared in the S1-1 into a polytetrafluoroethylene lining reaction kettle for reaction, wherein the reaction temperature is 160 ℃, and the reaction time is 5 hours; collecting the product after the reaction is finished, and drying the product in a forced air drying oven at 70 ℃ for 12 hours to obtain KTaO 3 Nano cubes.
S2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s2-1, 3mmolSe powder and 18mmolNa powder 2 SO 3 The powder was added to 60ml of deionized water and then reacted in an oil bath at 100℃to give Na 2 SeSO 3 A solution;
s2-2, 2.2mmolCdCl 2 Adding the powder into 40ml deionized water, stirring to dissolve completely to obtain CdCl 2 The solution was homogenized.
S3, 0.047g KTaO 3 Adding Na prepared by the above method into nanometer cube 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then the CdCl is treated 2 Solution is slowDropping the solution into the mixed solution to continue ultrasonic treatment for 30 min, stirring for 90min, washing and collecting the reaction product with deionized water and absolute ethyl alcohol, drying in vacuum at 60 deg.C for 12 hr, and grinding to obtain 90% CdSe/KTaO 3 A composite photocatalyst.
Example 2
CdSe/KTaO 3 The preparation method of the composite photocatalyst comprises the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s1-1, 25mL of KOH aqueous solution having a concentration of 15mol/L was prepared, and then 2.5mmolTa was added 2 O 5 Dispersing in KOH solution, magnetically stirring for 1 hour to obtain suspension;
s1-1, transferring the suspension prepared in the S1-1 into a polytetrafluoroethylene lining reaction kettle for reaction, wherein the reaction temperature is 160 ℃, and the reaction time is 5 hours; collecting the product after the reaction is finished, and drying the product in a forced air drying oven at 70 ℃ for 12 hours to obtain KTaO 3 Nano cubes.
S2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s2-1, 3mmolSe powder and 18mmolNa powder 2 SO 3 The powder was added to 60ml of deionized water and then reacted in an oil bath at 100℃to give Na 2 SeSO 3 A solution;
s2-2, 2.2mmolCdCl 2 Adding the powder into 40ml deionized water, stirring to dissolve completely to obtain CdCl 2 The solution was homogenized.
S3, 0.180g KTaO 3 Adding Na prepared by the above method into nanometer cube 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then the CdCl is treated 2 Slowly dripping the solution into the mixed solution, continuing to carry out ultrasonic treatment for 30 min, stirring for 90min, finally washing and collecting the reaction product by using deionized water and absolute ethyl alcohol, drying in vacuum at 60 ℃ for 12 hours, and grinding to obtain 70% CdSe/KTaO 3 A composite photocatalyst.
Example 3
CdSe/KTaO 3 The preparation method of the composite photocatalyst comprises the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s1-1, 25mL of KOH aqueous solution having a concentration of 15mol/L was prepared, and then 2.5mmolTa was added 2 O 5 Dispersing in KOH solution, magnetically stirring for 1 hour to obtain suspension;
s1-1, transferring the suspension prepared in the S1-1 into a polytetrafluoroethylene lining reaction kettle for reaction, wherein the reaction temperature is 160 ℃, and the reaction time is 5 hours; collecting the product after the reaction is finished, and drying the product in a forced air drying oven at 70 ℃ for 12 hours to obtain KTaO 3 Nano cubes.
S2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s2-1, 3mmolSe powder and 18mmolNa powder 2 SO 3 The powder was added to 60ml of deionized water and then reacted in an oil bath at 100℃to give Na 2 SeSO 3 A solution;
s2-2, 2.2mmolCdCl 2 Adding the powder into 40ml deionized water, stirring to dissolve completely to obtain CdCl 2 The solution was homogenized.
S3, 0.421g KTaO 3 Adding Na prepared by the above method into nanometer cube 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then the CdCl is treated 2 Slowly dripping the solution into the mixed solution, continuing to carry out ultrasonic treatment for 30 min, stirring for 90min, finally washing and collecting the reaction product by using deionized water and absolute ethyl alcohol, drying in vacuum at 60 ℃ for 12 hours, and grinding to obtain 50% CdSe/KTaO 3 A composite photocatalyst.
As shown in fig. 1, the X-ray diffraction pattern (XRD) patterns of different photocatalysts are shown, and XRD is used to characterize the phase structure of the material. As can be seen from FIG. 1, KTaO 3 All diffraction peaks of (3) can be completely attributed to the cubic phase KTaO 3 (JCPDSno: 38-1470). The XRD spectra of pure CdSe quantum dots confirm that CdSe is cubic phase, and three diffraction peaks at 25.4 °, 42.1 ° and 49.7 ° correspond to (111), (220) and (311) planes (JCPSDSNo. 19-0191) of cubic phase CdSe, respectively. In CdSe/KTaO 3 In the composite photocatalyst, cdSe and KTaO are detected 3 And with increasing CdSe content, the intensity of CdSe diffraction peak is gradually increased, while KTaO 3 The diffraction peak intensity of (2) gradually decreases. Based on these results, cdSe/KTaO was successfully produced 3 A composite photocatalyst.
As shown in FIG. 2, the morphology of the scanning electron microscope of the different photocatalysts is shown in FIG. 2a, and the pure KTaO is shown 3 Irregular nanocubes with smooth surfaces are presented, their size distribution varies from 200nm to 400 nm. FIG. 2b is a morphology of pure CdSe, a CdSe material consisting of particles with a diameter of about 200nm, with a tendency to agglomerate. As shown in FIG. 2c, when KTaO 3 After being compounded with CdSe nano particles, KTaO 3 The smooth surface of the nano-cube is uniformly covered with CdSe particles. These results demonstrate that CdSe particles and KTa O 3 The nano cubes are well combined, so that the separation of photo-generated carriers is facilitated, and the photocatalytic hydrogen production activity is improved.
The composite photocatalyst prepared in examples 1 to 3 was subjected to a verification test.
In the presence of simulated sunlight, H is generated by photocatalytic water decomposition 2 Reaction, study KTaO 3 CdSe and CdSe/KTaO with different proportions 3 Photocatalytic activity of the composite material. The photocatalytic hydrogen production reaction is performed in a photocatalytic water splitting system. 30mg of the photocatalyst was suspended in 100ml of water containing 80. Mu.l of chloroplatinic acid. At 0.35MNA 2 S and 0.25MNA 2 SO 3 As hole scavengers. The reaction temperature was maintained at about 6℃by means of a circulating water cooling system. Adopt 300W xenon lamp as simulation solar light source, H 2 The yield of (2) was determined by gas chromatography. As shown in FIG. 3 (a), the original KTaO 3 No hydrogen production activity, a small amount of hydrogen was detected from the original CdSe sample. As shown in FIG. 3 (b), cdSe/KTaO is compared with pure catalyst 3 The composite material shows significantly enhanced photocatalytic hydrogen production performance, wherein CdSe/KTaO containing 70wt% CdSe nanoparticles 3 The highest hydrogen production rate of the composite material is 15.48 mmol.g-1.h-1, which is about original CdSe and KTaO 3 3.3 times and 17 times of (a).
Thus, the first and second substrates are bonded together,the invention provides a CdSe/KTaO 3 Preparation method and application of composite photocatalyst, wherein CdSe nano particles are uniformly coated on KTaO 3 The surface of the nano cubic block widens KTaO 3 Promotes the separation and migration of photo-generated electron-hole pairs, and the prepared CdSe/KTaO 3 The composite photocatalyst has a higher CdSe and KTaO than those of CdSe and KTaO 3 Is a photocatalytic activity of (a); the preparation method is simple, the experimental conditions are easy to control, the cost is low, and the safety and the reliability are realized; the prepared CdSe/KTaO 3 The composite photocatalyst has good application prospect and industrialization prospect in the field of photolysis of water to produce hydrogen.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (9)
1. CdSe/KTaO 3 Preparation method of composite photocatalyst, uniformly loading CdSe nano particles on KTaO 3 The nano cubic block surface is characterized by comprising the following steps:
s1, preparing KTaO by utilizing hydrothermal method 3 A nano cube;
s2, preparing Na 2 SeSO 3 Solution and CdCl 2 A solution;
s3, KTaO is taken 3 Adding Na into the nano cubic block 2 SeSO 3 Ultrasonic treatment is carried out in the solution, and then CdCl is added 2 Slowly dripping the solution into the mixed solution, continuing ultrasonic treatment and stirring treatment, finally cleaning and collecting the reaction product, and vacuum drying and grinding to obtain CdSe/KTaO 3 A composite photocatalyst.
2. A CdSe/KTaO as claimed in claim 1 3 The preparation method of the composite photocatalyst is characterized in that the step S1 preparation of KTaO by hydrothermal method 3 The specific steps of the nano cube are as follows:
s1-1, 25mL of KOH aqueous solution having a concentration of 15mol/L was prepared, and then 2.5mmolTa was added 2 O 5 Dispersing in KOH solution, magnetically stirring for 1 hour to obtain suspension;
s1-2, transferring the suspension prepared in the S1-1 into a polytetrafluoroethylene lining reaction kettle for reaction, collecting a product after the reaction is finished into a forced air drying box for drying to obtain KTaO 3 Nano cubes.
3. A CdSe/KTaO as claimed in claim 2 3 The preparation method of the composite photocatalyst is characterized by comprising the following steps: in the step S1-2, the reaction temperature in the reaction kettle is 150 ℃ and the reaction time is 5 hours; the temperature in the forced air drying oven was 70℃and dried for 12 hours.
4. A CdSe/KTaO as claimed in claim 3 3 The preparation method of the composite photocatalyst is characterized in that in the step S2, na is prepared 2 SeSO 3 The specific operation of the solution is as follows: se powder and Na 2 SO 3 Adding the powder into deionized water, and then reacting in an oil bath to obtain Na 2 SeSO 3 Solution of Se powder and Na 2 SO 3 The ratio of the amounts of the substances of the powder was 1:6.
5. A CdSe/KTaO as recited in claim 4 3 The preparation method of the composite photocatalyst is characterized by comprising the following steps: in the step S2, cdCl is prepared 2 The specific operation of the solution is as follows: cdCl is reacted with 2 Adding the powder into deionized water, stirring to dissolve completely to obtain CdCl 2 Homogeneous solution of Se powder and CdCl 2 The ratio of the amounts of the substances of the powder was 15:11.
6. A CdSe/KTaO as recited in claim 5 3 The preparation method of the composite photocatalyst is characterized by comprising the following steps: in the step S3, KTaO 3 The mass of the nano cube is 0.047-0.421g。
7. CdSe/KTaO according to claim 6 3 The preparation method of the composite photocatalyst is characterized by comprising the following steps: in the step S3, the reaction product is centrifugally washed by deionized water and absolute ethyl alcohol, is dried in vacuum for 12 hours at the temperature of 60 ℃, and is ground to obtain CdSe/KTaO 3 A composite photocatalyst.
8. CdSe/KTaO prepared by the preparation method of any of claims 1-7 3 The composite photocatalyst is characterized in that: the CdSe/KTaO 3 CdSe and KTaO in composite photocatalyst 3 The mass ratio of (2) is one of 5:5, 7:3 or 9:1.
9. CdSe/KTaO prepared by the preparation method of any of claims 1-7 3 The application of the composite photocatalyst in hydrogen production.
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| US20210130188A1 (en) * | 2019-10-31 | 2021-05-06 | The Research Foundation For The State University Of New York | Quantum material/vanadium oxide heterostructures, methods of making same, and uses thereof |
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