CN109126829B - Preparation method of CdS-MoS2 composite powder with three-dimensional heterostructure - Google Patents
Preparation method of CdS-MoS2 composite powder with three-dimensional heterostructure Download PDFInfo
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- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
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Images
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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
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- B01J35/39—
-
- B01J35/612—
-
- B01J35/633—
-
- B01J35/647—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- 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
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
Three-dimensional heterostructure CdS-MoS2A preparation method of composite powder relates to the technical field of preparation of composite materials suitable for new energy and environmental sewage remediation. Adding ammonium molybdate, thiourea and glycine or L-aspartic acid into ionized water for mixing and dissolving, placing the mixture into a constant-temperature air-blast oven for reaction after ultrasonic treatment, and obtaining black MoS after post-treatment after reaction2Powder; adding molybdenum disulfide, cadmium acetate and thiourea into ionized water for mixing and dissolving, performing ultrasonic treatment, putting the mixture into a constant-temperature blast oven for reaction, and performing post-treatment after the reaction to obtain yellow brown or black CdS-MoS2And (3) powder. The method successfully obtains the shape-controllable three-dimensional heterostructure CdS-MoS by a two-step hydrothermal method2And (3) composite powder. The results of series of experiments show that CdS-MoS with different morphologies can be obtained by changing the amount of loaded CdS2The composite powder has the characteristics of narrow particle size distribution, uniform shape distribution, controllable particle size and the like.
Description
Technical Field
The invention relates to the technical field of preparation of composite materials suitable for new energy and environmental sewage remediation, in particular to CdS-MoS with a three-dimensional heterostructure2Method for preparing composite powder。
Background
It was found that for MoS2The carrier of the load type catalyst mainly plays the roles of modifying and strengthening a matrix. The catalyst has specific appearance and appearance, and the adsorbability, catalytic activity and the like of the catalyst are improved. At present, in various synthesized composite photocatalysts, if a carrier is gamma-Al2O3It will react with MoS2The interaction between the catalyst and the catalyst limits the hydrodesulfurization activity of the catalyst; when in TiO state2And ZrO2When the catalyst is used as a carrier material, the specific surface area of the catalyst is reduced and the catalyst is easily decomposed by heat; mesoporous molecular sieves and activated carbon supported catalysts have limited materials available for catalytic degradation due to their specific structure. In summary, the general support material pairs MoS2The catalytic performance of (2) has a certain enhancement effect, but also brings some disadvantages. Therefore, other more ideal carriers need to be found to further promote MoS2Performance of the supported catalyst.
The CdS semiconductor has a narrow forbidden band width, can be excited under the irradiation of visible light to generate photo-generated electron-hole pairs, can perform oxidation-reduction reaction on organic pollutants, and can perform catalytic degradation. Researches find that the nano CdS material has quantum size effect, so that the forbidden band width is wider, and the redox capability of photo-generated electrons and holes is enhanced; the specific surface area is increased, and more organic pollutants can be adsorbed; meanwhile, the recombination probability of the photoproduction electron-hole pair is reduced, and the catalytic capability of the photoproduction electron-hole pair is enhanced. However, if the nano CdS directly acts on the organic matters in the photocatalytic degradation water, partial CdS particles are easy to form residues in the water and are difficult to be thoroughly separated from the water, so that secondary pollution is caused.
The method adopts molybdenum disulfide with a micro-nano structure as a carrier to synthesize CdS/MoS by a hydrothermal method2The powder photocatalyst is compounded, and the performance of degrading rhodamine B through photocatalysis is researched. The obtained series of three-dimensional heterostructure CdS-MoS2The composite powder has excellent adsorption and catalytic performance and is expected to be used in the field of sewage treatment.
Disclosure of Invention
The invention aims to solve the technical problem of providing the three-dimensional heterostructure CdS-MoS which has simple process and low cost and is suitable for industrial scale production2A preparation method of composite powder.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: three-dimensional heterostructure CdS-MoS2The preparation method of the composite powder comprises the following steps:
1)、MoS2preparation of powder
According to the mass ratio of 1: 1.5-6.5: 0.65-5.7, weighing ammonium molybdate, thiourea and glycine or L-aspartic acid in a beaker, adding ionized water for mixing and dissolving, placing the mixture into an ultrasonic cleaner for ultrasonic treatment, and transferring the mixed solution into a reaction kettle with a polytetrafluoroethylene lining; putting the reaction kettle cover into a constant-temperature blast oven for reaction, and performing post-treatment after the reaction to obtain black MoS2Powder;
2)、CdS-MoS2preparation of composite powder
According to the mass ratio of 6: 1-9: weighing molybdenum disulfide, cadmium acetate and thiourea in a beaker by 0-3, adding deionized water for mixing and dispersing, placing the beaker into an ultrasonic cleaner for ultrasonic treatment, pouring the mixed solution into a polytetrafluoroethylene lined reaction kettle, placing the reaction kettle covered in a constant-temperature blast oven for reaction, and performing post-treatment after the reaction to obtain tawny or black CdS-MoS2And (3) powder.
Three-dimensional heterostructure CdS-MoS as subject of the invention2The preferable technical scheme of the preparation method of the composite powder comprises the steps of 1) carrying out hydrothermal reaction at the temperature of 160-180 ℃ for 10-36 hours, 2) carrying out hydrothermal reaction at the temperature of 140-160 ℃ for 8-36 hours, and carrying out ultrasonic treatment in an ultrasonic cleaner for 0.5-2 hours in the steps 1) and 2). And the post-treatment is to perform solid-liquid separation on the reaction product, then alternately wash the reaction product by using absolute ethyl alcohol and deionized water respectively, and then dry the reaction product in a constant-temperature drying oven, wherein the drying temperature in the constant-temperature drying oven is 40-80 ℃, and the drying time is 6-18 h.
The method successfully obtains the shape-controllable three-dimensional heterostructure CdS-MoS by a two-step hydrothermal method2Composite powderAnd (3) a body. The results of series of experiments show that CdS-MoS with different morphologies can be obtained by changing the amount of loaded CdS2The composite powder has the characteristics of narrow particle size distribution, uniform shape distribution, controllable particle size and the like.
Compared with the prior art, the invention also has the following advantages:
1) the invention realizes the two-step hydrothermal method to obtain the shape-controllable three-dimensional heterostructure CdS-MoS2The composite powder provides a new way for synthesizing the molybdenum disulfide-based composite nano material.
2) The invention has simple process, easy construction of the whole preparation system, simple and convenient operation, easy control of conditions, low cost, easy control of product composition, uniform product distribution, difficult agglomeration and suitability for large-scale industrial production.
3) The invention adopts the conventional soluble ammonium molybdate and the soluble cadmium salt as reactants, does not add other auxiliary substances in the preparation process, produces few by-products and has less environmental pollution, thus being an environment-friendly synthesis process.
4) The product prepared by the method has good adsorption performance and catalytic activity, and can be used for environmental pollution remediation, new energy (photolysis of water to produce hydrogen) and the like.
Drawings
The following three-dimensional heterostructure CdS-MoS of the invention is combined with the embodiment and the attached drawings2The preparation method of the composite powder is further described in detail.
FIGS. 1a-b are CdS-MoS prepared in example 12A field emission scanning electron microscope (FE-SEM) image of the composite powder (the images a and b correspond to low-magnification image and high-magnification image respectively); FIG. 1c is the three-dimensional heterostructure CdS-MoS prepared in example 12Elemental analysis (EDS) of the composite powder; FIG. 1d is the three-dimensional heterostructure CdS-MoS prepared in example 12XRD pattern of the composite powder.
FIG. 2a is the three-dimensional heterostructure CdS-MoS prepared in example 12XPS graph of composite powder; FIG. 2b is the three-dimensional heterostructure CdS-MoS prepared in example 12BET diagram of the composite powder; FIG. 2c is the three-dimensional heterostructure CdS-MoS prepared in example 12Composite powder asAnd (3) in the presence of a catalyst, a degradation diagram of rhodamine B under visible light.
FIGS. 3a-b are CdS-MoS prepared in example 22A field emission scanning electron microscope (FE-SEM) image of the composite powder (the images a and b correspond to low-magnification image and high-magnification image respectively); FIG. 3c is the three-dimensional heterostructure CdS-MoS prepared in example 22XRD pattern of the composite powder; FIG. 3d is the three-dimensional heterostructure CdS-MoS prepared in example 22And when the composite powder is used as a catalyst, the rhodamine B is degraded under visible light.
FIGS. 4a-b are CdS-MoS prepared in example 32A field emission scanning electron microscope (FE-SEM) image of the composite powder (the images a and b correspond to low-magnification image and high-magnification image respectively); FIG. 4c is the three-dimensional heterostructure CdS-MoS prepared in example 32And when the composite powder is used as a catalyst, the rhodamine B is degraded under visible light.
Detailed Description
Example 1
CdS(20wt％)-MoS2Preparation of composite powder
1)、MoS2Preparation of powder
0.298g of ammonium molybdate, 0.609g of thiourea and 0.5g of glycine are weighed into a beaker, 15mL of deionized water is added for mixing and dissolving, and the mixture is placed into an ultrasonic cleaner for 30min by ultrasound. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 180 ℃, and preserving heat for 24 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. Putting the washed product into an oven, setting the temperature at 60 ℃, preserving the heat for 12 hours, and drying to obtain MoS2Black powder.
2)、CdS-MoS2Preparation of composite powder
0.270g of molybdenum disulfide and 0.111g of cadmium acetate are weighed into a beaker, 15mL of deionized water is added for mixing and dissolving, and the mixture is placed into an ultrasonic cleaner for ultrasonic treatment for 30 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 160 ℃, and preserving heat for 12 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. And (4) putting the washed product into an oven, setting the temperature to be 60 ℃, preserving the heat for 12 hours, and drying to obtain dry black powder.
FIGS. 1a-b are CdS (20 wt%) -MoS prepared in example 12The field emission scanning electron microscope (FE-SEM) images of the composite powder (corresponding to the low and high magnification images in the images a and b), respectively, show that the MoS matrix2The surface is in a lamellar shape, the thickness of the lamellar is uniform, the whole is in a nearly spherical shape, and the particle size is about 2 mu m. The small particles uniformly attached to the CdS nanoparticles have a particle size of about 0.3 μm. The CdS carrier is uniformly dispersed and grown on the MoS substrate2In addition, the expected compound effect is achieved. By performing local EDS analysis on fig. 1b, it can be seen that the composite powder contains a large amount of S and Mo elements and a small amount of Cd element as shown in fig. 1 c. FIG. 1d is the three-dimensional heterostructure CdS-MoS prepared in example 12The XRD pattern of the composite powder has diffraction peaks at diffraction angles 2 theta of 25.034 degrees, 26.539 degrees, 28.031 degrees, 36.733 degrees, 43.830 degrees, 47.950 degrees and 51.93 degrees, crystal faces of the diffraction peaks are (100), (002), (101), (102), (110), (103) and (112), and compared with JCPDS (77-2306) which is a standard card of CdS, three strong peaks can be aligned, which indicates that the composite powder contains CdS and is in a hexagonal crystal form. At 29.323 DEG 2 theta, a more pronounced diffraction peak appears, presumably belonging to MoS2。
In addition, FIG. 2a shows an XPS spectrum of the composite powder obtained in example 1. As shown in the figure, the elements corresponding to the main peaks are Mo, S and Cd, respectively. FIG. 2b shows N in the composite powder obtained in example 12Adsorption/desorption isotherm spectrum. The curve in the figure is a type IV isotherm. The specific surface area of the sample was calculated to be 5.496m according to the BET equation2Pore volume 0.018cc/g, average pore diameter 3.857 nm. FIG. 2c is a graph showing the effect of the composite powder obtained in example 1 on the photocatalytic degradation of rhodamine B by visible light, and it can be seen from the graph that the absorption peak intensity of rhodamine B is greatly reduced at 10min, and the absorption peak intensity approaches 0 at 20min, and rhodamine B is almost completely degraded.
Example 2
CdS(10wt％)-MoS2Preparation of composite powder
The procedure is as in example 1 to prepare CdS-MoS2The raw materials adopted in the composite powder are 0.240g of molybdenum disulfide, 0.056g of cadmium acetate and 0.016g of thiourea.
FIGS. 3a-b are CdS (10 wt%) -MoS prepared in example 22The base MoS is shown in the field emission scanning electron microscope (FE-SEM) images (corresponding to the low and high magnification images in the images a and b), respectively2Part of the surface is of a lamellar structure, and the part of the surface is compact, is approximately spherical as a whole, and has the particle size of about 1 mu m. About MoS2Densification of the surface occurred, probably due to direct substitution of part of the surface layer MoS by CdS2And a novel structure is formed. FIG. 3c is CdS (10 wt%) -MoS prepared in example 22The XRD pattern of the composite powder shows strong diffraction peaks at diffraction angles 2 theta of 13.973 degrees, 32.549 degrees and 35.882 degrees, and the crystal planes of the strong diffraction peaks are (002), (100) and (102), and MoS2Compared with the standard card JCPDS (75-1539), the three strong peaks can be paired up. And can derive MoS2The crystal structure of (A) is 2H type. Because the loaded CdS is less, the diffraction peak is not obvious and is not completely detected in the map. FIG. 3d is a diagram showing the effect of degrading rhodamine B by visible light catalysis of the composite powder obtained in example 2. The strongest absorption peak intensities of rhodamine B are reduced in different degrees at 20min, 40min, 60min and 80min, and the absorption peaks almost disappear when the absorption peak intensities reach 80min, so that the catalysis is more thorough.
Example 3
CdS(30wt％)-MoS2Preparation of composite powder
The procedure is as in example 1 to prepare CdS-MoS2The raw materials adopted in the composite powder are 0.210g of molybdenum disulfide, 0.166g of cadmium acetate and 0.100g of thiourea.
FIGS. 4a-b are CdS (30 wt%) -MoS prepared in example 32The MoS matrix can be seen from the field emission scanning electron microscope (FE-SEM) images (corresponding to the low and high magnification images in the images a and b), respectively, of the composite powder2Is nearly spherical, has a lamellar structure on the surface, and has different particle sizes of 1-2 μm. The CdS morphology of the carrier also has uneven growth, part of the CdS morphology is in a cluster shape, and the other part of the CdS morphology is in a rod shape. Closing deviceThe film-like substance appearing in the figure is presumed to be CdS. The matrix and the carrier grow independently and are not well compounded together. FIG. 4c is a diagram showing the effect of degrading rhodamine B by visible light catalysis of the composite powder obtained in example 3. From the graph, it is understood that the intensity of the absorption peak of rhodamine B is slightly decreased with the passage of time. At 80min, the rhodamine B still has strong absorption peak intensity, and the degradation is not thorough.
Example 4
CdS-MoS2Preparation of composite powder
1)、MoS2Preparation of powder
0.298g of ammonium molybdate, 1.2g of thiourea and 1.7g L-aspartic acid are weighed into a beaker, mixed and dissolved by adding 15mL of deionized water, and placed into an ultrasonic cleaner for 110min by ultrasound. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 180 ℃, and preserving heat for 10 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. Putting the washed product into an oven, setting the temperature at 50 ℃, preserving the heat for 6 hours, and drying to obtain MoS2Black powder.
2)、CdS-MoS2Preparation of composite powder
Weighing 0.240g of molybdenum disulfide, 0.056g of cadmium acetate and 0.016g of thiourea in a beaker, adding 15mL of deionized water for mixing and dissolving, and putting the mixture into an ultrasonic cleaner for ultrasonic treatment for 90 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 160 ℃, and preserving heat for 12 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. And (4) putting the washed product into an oven, setting the temperature at 60 ℃, preserving the heat for 18h, and drying to obtain dry black powder.
Example 5
CdS-MoS2Preparation of composite powder
1)、MoS2Preparation of powder
0.298g of ammonium molybdate, 0.45g of thiourea and 0.95g of glycine are weighed into a beaker, 15mL of deionized water is added for mixing and dissolving, and the mixture is placed into an ultrasonic cleaner for ultrasonic treatment for 40 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 160 ℃, and preserving heat for 36 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. Putting the washed product into an oven, setting the temperature at 40 ℃, preserving the heat for 10 hours, and drying to obtain MoS2Black powder.
2)、CdS-MoS2Preparation of composite powder
Weighing 0.240g of molybdenum disulfide, 0.056g of cadmium acetate and 0.016g of thiourea in a beaker, adding 15mL of deionized water for mixing and dissolving, and putting the mixture into an ultrasonic cleaner for ultrasonic treatment for 80 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 140 ℃, and preserving heat for 36 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. And putting the washed product into an oven, setting the temperature at 50 ℃, preserving the heat for 12 hours, and drying to obtain dry black powder.
Example 6
CdS-MoS2Preparation of composite powder
1)、MoS2Preparation of powder
0.298g of ammonium molybdate, 1.85g of thiourea and 0.2g L-aspartic acid are weighed into a beaker, 15mL of deionized water is added for mixing and dissolving, and the beaker is placed into an ultrasonic cleaner for ultrasonic treatment for 60 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 170 ℃, and preserving heat for 20 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. Putting the washed product into an oven, setting the temperature at 60 ℃, preserving the heat for 8 hours, and drying to obtain MoS2Black colorAnd (3) powder.
2)、CdS-MoS2Preparation of composite powder
0.270g of molybdenum disulfide and 0.111g of cadmium acetate are weighed into a beaker, 15mL of deionized water is added for mixing and dissolving, and the mixture is placed into an ultrasonic cleaner for ultrasonic treatment for 50 min. The mixed solution was poured into a 25mL teflon reactor liner, 5mL deionized water was additionally weighed to rinse the beaker, and the rinse was poured into the reactor. And (3) putting the reaction kettle into an oven, heating to 150 ℃, and preserving heat for 8 hours. The reacted product was removed to a centrifuge tube and washed 3 times with absolute ethanol and deionized water alternately. And putting the washed product into an oven, setting the temperature at 40 ℃, preserving the heat for 15h, and drying to obtain dry black powder.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (1)
1. Three-dimensional heterostructure CdS-MoS2The preparation method of the composite powder is characterized by comprising the following steps:
1）、MoS2preparation of powder
Weighing 0.298g of ammonium molybdate, 0.609g of thiourea and 0.5g of glycine in a beaker, adding 15mL of deionized water for mixing and dissolving, and putting the beaker into an ultrasonic cleaner for ultrasonic treatment for 30 min; pouring the mixed solution into a lining of a 25mL polytetrafluoroethylene reaction kettle, measuring 5mL deionized water to wash a beaker, and pouring the washing liquid into the reaction kettle; putting the reaction kettle into an oven, heating to 180 ℃, and preserving heat for 24 hours; the product after reaction is removed into a centrifugal test tube, and is alternately cleaned by absolute ethyl alcohol and deionized water for 3 times; putting the washed product into an oven, setting the temperature at 60 ℃, preserving the heat for 12 hours, and drying to obtain MoS2Black powder;
2）、CdS-MoS2preparation of composite powder
Weighing 0.270g of molybdenum disulfide and 0.111g of cadmium acetate in a beaker, adding 15mL of deionized water for mixing and dissolving, and putting the mixture into an ultrasonic cleaner for ultrasonic treatment for 30 min; pouring the mixed solution into a lining of a 25mL polytetrafluoroethylene reaction kettle, measuring 5mL deionized water to wash a beaker, and pouring the washing liquid into the reaction kettle; putting the reaction kettle into an oven, heating to 160 ℃, and preserving heat for 12 hours; the product after reaction is removed into a centrifugal test tube, and is alternately cleaned by absolute ethyl alcohol and deionized water for 3 times; and (4) putting the washed product into an oven, setting the temperature to be 60 ℃, preserving the heat for 12 hours, and drying to obtain dry black powder.
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