CN115025787B - Preparation method and application of CdS nanoparticle-doped coated ZnO nanoflower powder - Google Patents
Preparation method and application of CdS nanoparticle-doped coated ZnO nanoflower powder Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 44
- 239000002057 nanoflower Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000008367 deionised water Substances 0.000 claims abstract description 25
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 25
- 239000002105 nanoparticle Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 20
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004312 hexamethylene tetramine Substances 0.000 claims abstract description 9
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims abstract description 9
- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000002243 precursor Substances 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- LHQLJMJLROMYRN-UHFFFAOYSA-L cadmium acetate Chemical compound [Cd+2].CC([O-])=O.CC([O-])=O LHQLJMJLROMYRN-UHFFFAOYSA-L 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000013033 photocatalytic degradation reaction Methods 0.000 claims description 7
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 5
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 5
- 229910001437 manganese ion Inorganic materials 0.000 claims description 4
- 239000002957 persistent organic pollutant Substances 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 20
- 239000011941 photocatalyst Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 239000002096 quantum dot Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000007146 photocatalysis Methods 0.000 description 6
- 229910052724 xenon Inorganic materials 0.000 description 6
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 6
- 238000002835 absorbance Methods 0.000 description 5
- 238000002336 sorption--desorption measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000593 degrading effect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229940071125 manganese acetate Drugs 0.000 description 2
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 231100001234 toxic pollutant Toxicity 0.000 description 1
Classifications
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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
-
- B01J35/39—
-
- B01J35/40—
-
- 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
-
- 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 provides a preparation method and application of CdS nanoparticle-doped coated ZnO nanoflower powder, and relates to the technical field of photocatalytic material preparation. The preparation method and application of the CdS nanoparticle-doped coated ZnO nanoflower powder comprise the following steps: s1, dissolving zinc nitrate hexahydrate in deionized water and uniformly stirring to obtain a colorless transparent solution A; and then, dissolving hexamethylenetetramine in deionized water, adding the deionized water into the solution A after stirring uniformly, and dropwise adding sodium hydroxide solution into the solution A until white floccules appear in the turbid solution. The preparation method and the application of the ZnO nanoflower powder coated by the doped CdS nanoparticles greatly improve the absorption rate of ZnO to visible light, and the quantum dot modification greatly improves the specific surface area of ZnO, so that excellent photocatalytic activity is obtained, and the ZnO nanoflower powder is an excellent photocatalyst.
Description
Technical Field
The invention relates to the technical field of preparation of photocatalytic materials, in particular to a preparation method and application of CdS nanoparticle-coated ZnO nanoflower powder.
Background
The photocatalysis technology is a novel water treatment technology with great prospect, can utilize sunlight to degrade most of organic pollutants in water, and has the characteristics of low cost, environmental friendliness, no secondary pollution and the like.
Since the discovery of the photocatalysis technology for over 40 years, through research and continuous efforts of a plurality of domestic and foreign scholars, the photocatalysis technology has greatly progressed, has been greatly developed in a plurality of fields, and can degrade organic and toxic pollutants in the aspect of environmental treatment to reduce NO into NO 2 The method comprises the steps of carrying out a first treatment on the surface of the In terms of clean energy, the hydrogen can decompose water to produce clean energy hydrogen, and reduce carbon dioxide into hydrocarbon such as methane and ethanol.
Compared with other treatment methods, the semiconductor photocatalytic degradation technology has various advantages:
1. the conditions required by the photocatalytic reaction are mild, and the operation is simple;
2. the semiconductor photocatalyst has low cost, is nontoxic and can be recycled;
3. hydroxyl free radicals generated in the photocatalysis process have strong oxidability and nonselectivity, so that a plurality of organic pollutants can be degraded, thoroughly decomposed and mineralized, and no secondary pollution is caused;
4. the photocatalyst used in this technique can be excited by sunlight, which is an inexhaustible energy source, as we know, to trigger a series of photocatalytic redox reactions.
Therefore, the photocatalysis technology is a low-energy-consumption and effective strategy in the multi-aspect exploration of pollution control by using the photochemical method at present and even in the future, and can effectively solve serious problems such as environmental pollution, energy shortage and the like.
The ZnO serving as the most widely studied photocatalytic material has been proved to have good photocatalytic performance, is a typical direct band gap n-type semiconductor of II-VI groups, has a band gap of 3.37eV (298K), has an exciton binding energy of up to 60meV, and has high exciton binding energy so that high electron mobility is not easy to perform exciton recombination, so that the ZnO has a huge application prospect in the field of photoelectric application, but has a large band gap which can only be excited by ultraviolet light, so that the utilization of sunlight is greatly limited, and the requirement of developing novel photocatalytic materials capable of being excited by visible light can not be met, and meanwhile, has high efficiency, stability and low price to solve the problem of organic pollution.
Disclosure of Invention
In order to solve the defects in the background art, the invention aims to provide a preparation method and application of ZnO nanoflower powder coated by doped CdS nanoparticles, so as to solve the problem that ZnO cannot meet the requirement of developing novel photocatalytic materials capable of being excited by visible light and simultaneously solving the problem of organic pollution.
The aim of the invention can be achieved by the following technical scheme:
the preparation method of the CdS nanoparticle-doped coated ZnO nanoflower powder comprises the following steps:
s1, dissolving zinc nitrate hexahydrate in deionized water and uniformly stirring to obtain a colorless transparent solution A; dissolving hexamethylenetetramine in deionized water, stirring uniformly, adding the solution into the solution A, and dropwise adding sodium hydroxide solution into the solution A until white floccules appear in the turbid solution to obtain solution B; stirring the solution B, transferring the solution B to a hydrothermal reaction kettle, heating and preserving heat for 6-72h, and waiting for the hydrothermal reaction kettle to cool to room temperature to obtain a white precipitate product;
s2, washing and centrifuging the white precipitate obtained in the step S1 by deionized water and ethanol, and drying to obtain ZnO nanoflower precursor powder;
s3, dispersing the ZnO nanoflower precursor powder obtained in the step S2 into a three-bevel-mouth flask, continuously stirring, adding a sodium sulfide solution into the three-bevel-mouth flask, preparing 100ml of cadmium acetate solution at the same time, and adding the solution into the reaction system to react for 0.5-6 hours to obtain ZnO nanoflower coated with CdS nanoparticles;
s4, adding manganese ions into the cadmium acetate solution prepared in the step S3 in different molar ratios for doping, and finally centrifugally separating and drying in an oven to obtain ZnO nanoflower powder coated by doped CdS nanoparticles.
Preferably, in the step S1, the obtained white precipitate is a flower-like ZnO precursor, and the flower-like ZnO precursor is synthesized with the auxiliary reactants of zinc nitrate hexahydrate, hexamethylenetetramine and sodium hydroxide in an auxiliary manner, and is generated by hydrothermal reaction at 90-140 ℃ for 6-72 h.
Preferably, in the step S2, the white precipitate is centrifuged twice by deionized water and once by ethanol, and the centrifugation is performed at 7000rpm for 5min, and then dried in an oven for 12h at a drying temperature of 50 ℃.
Preferably, in the step S1, the sodium hydroxide solution is configured to be 2M/L, the pH value of the solution B is controlled between 7 and 14, and the heat preservation time in the hydrothermal reaction kettle is between 6 and 72 hours.
Preferably, in the step S4, the manganese ion doping ratio ranges from 1% to 10%.
Preferably, in the step S4, the photocatalytic performance of the ZnO nanoflower powder coated with the doped CdS nanoparticles is evaluated, which is obtained by dispersing the ZnO nanoflower powder coated with the doped CdS nanoparticles obtained in the step S4 in a RhB solution, and performing degradation under a xenon lamp for 1-6 hours by simulating sunlight, and then sampling at intervals, and waiting for testing the absorbance.
Preferably, the RhB solution is prepared in a range of 5mg/L to 20mg/L, the xenon lamp power is 300W, and the sampling time interval is 20min to 60min.
As a general inventive concept, the invention also provides application of the CdS nanoparticle-coated ZnO nanoflower powder obtained by the preparation method of the CdS nanoparticle-coated ZnO nanoflower powder in photocatalytic degradation of organic pollutants.
The invention has the beneficial effects that:
the preparation method of the ZnO nanoflower powder coated by the doped CdS nanoparticles provided by the invention greatly improves the absorption rate of ZnO to visible light, and the quantum dot modification greatly improves the specific surface area of ZnO, so that excellent photocatalytic activity is obtained, and the preparation method is an excellent photocatalyst, and the preparation process is relatively simple, is suitable for large-scale mass production, and has a considerable application potential.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort;
FIG. 1 is an XRD pattern of a sample prepared in comparative example;
FIG. 2 is an XRD pattern of the sample prepared in example 1;
FIG. 3 is an SEM photograph of a sample prepared according to example 1;
fig. 4 is a graph comparing photocatalytic degradation RhB performance of comparative example, example 1, example 2 and example 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Comparative example
2mmol of zinc nitrate is dissolved in 50ml of deionized water and stirred uniformly to obtain colorless transparent solution; dissolving 2mmol of hexamethylenetetramine in the solution, dropwise adding the prepared sodium hydroxide solution into the solution, transferring the solution into a reaction kettle, and preserving the temperature for 12 hours; and after the hydrothermal reaction kettle is naturally cooled, washing and centrifuging the obtained white precipitate with deionized water twice, washing and centrifuging with ethanol once, and finally drying to obtain white flower-shaped ZnO precursor powder.
Example 1
2mmol of zinc nitrate is dissolved in 50ml of deionized water and stirred uniformly to obtain colorless transparent solution; dissolving 2mmol of hexamethylenetetramine in the solution, dropwise adding the prepared sodium hydroxide solution into the solution, transferring the solution into a reaction kettle, and preserving the temperature for 12 hours; after the hydrothermal reaction kettle is naturally cooled, washing and centrifuging the obtained white precipitate with deionized water twice, washing and centrifuging with ethanol once, and finally drying to obtain white flower-shaped ZnO precursor powder;
adding 100ml of deionized water into a three-diagonal flask, heating in a hydrothermal pot, dispersing flower-shaped ZnO precursor powder into the three-diagonal flask, continuously stirring, dissolving 2mmol of sodium sulfide into the solution, adding 2mmol of cadmium acetate into 100ml of deionized water, continuously stirring, dropwise adding the solution into the three-diagonal flask after the solution is thoroughly dissolved, heating to 100 ℃ for 2 hours at room temperature, and centrifugally drying to obtain CdS nanoparticle modified ZnO nanoflower heterojunction powder (ZnO/Mn-CdS).
Example 2
2mmol of zinc nitrate is dissolved in 50ml of deionized water and stirred uniformly to obtain colorless transparent solution; dissolving 2mmol of hexamethylenetetramine in the solution, dropwise adding the prepared sodium hydroxide solution into the solution, transferring the solution into a reaction kettle, and preserving the temperature for 12 hours; after the hydrothermal reaction kettle is naturally cooled, washing and centrifuging the obtained white precipitate with deionized water twice, washing and centrifuging with ethanol once, and finally drying to obtain white flower-shaped ZnO precursor powder;
adding 100ml of deionized water into a three-diagonal flask, heating in a hydrothermal pot, dispersing flower-shaped ZnO precursor powder into the three-diagonal flask, continuously stirring, dissolving 2mmol of sodium sulfide into the solution, adding 1.99mmol of cadmium acetate and 0.01mmol of manganese acetate into 100ml of deionized water together, continuously stirring, dropwise adding into the three-diagonal flask after the solution is completely dissolved, heating to 100 ℃ at room temperature for 2 hours, stopping reaction, and centrifugally drying to obtain CdS nano particle modified ZnO nano flower heterojunction powder (ZnO/0.5% Mn-CdS).
Example 3
2mmol of zinc nitrate is dissolved in 50ml of deionized water and stirred uniformly to obtain colorless transparent solution; dissolving 2mmol of hexamethylenetetramine in the solution, dropwise adding the prepared sodium hydroxide solution into the solution, transferring the solution into a reaction kettle, and preserving the temperature for 12 hours; after the hydrothermal reaction kettle is naturally cooled, washing and centrifuging the obtained white precipitate with deionized water twice, washing and centrifuging with ethanol once, and finally drying to obtain white flower-shaped ZnO precursor powder;
adding 100ml of deionized water into a three-diagonal flask, heating in a hydrothermal pot, dispersing flower-shaped ZnO precursor powder into the three-diagonal flask, continuously stirring, dissolving 2mmol of sodium sulfide into the solution, adding 1.98mmol of cadmium acetate and 0.02mmol of manganese acetate into 100ml of deionized water together, continuously stirring, dropwise adding into the three-diagonal flask after the solution is completely dissolved, heating to 100 ℃ at room temperature for 2 hours, stopping reaction, and centrifugally drying to obtain CdS nano particle modified ZnO nano flower heterojunction powder (ZnO/1% Mn-CdS).
For the comparative example:
the ZnO photocatalyst powder in the comparative example obtained by the invention is used for degrading RhB, and the test conditions are as follows: preparing a RhB solution with the concentration of 5mg/L, taking 100ml of the RhB solution, ultrasonically dispersing a 100mg powder sample into the RhB solution, continuously stirring for 30min under a dark condition to enable the RhB solution to achieve full and complete adsorption-desorption, simulating sunlight illumination under a 300W xenon lamp for 80min, taking a sample every 20min to be tested for absorbance evaluation, and as can be seen from FIG. 4, the ZnO nanoflower obtained by the invention has photocatalysis performance.
For example 1:
the photocatalyst powder (ZnO/CdS) in example 1 obtained in the invention was used for degrading RhB under the following test conditions: preparing a RhB solution with the concentration of 5mg/L, taking 100ml of the RhB solution, ultrasonically dispersing a 100mg powder sample into the RhB solution, continuously stirring for 1h under a dark condition to enable the RhB solution to achieve full and complete adsorption-desorption, simulating sunlight illumination for 80min under a 300W xenon lamp, taking a sample every 20min to be tested for absorbance evaluation, and as can be seen from FIG. 4, the CdS nanoparticle modified ZnO nanoflower obtained by the invention has excellent photocatalytic performance.
For example 2:
the photocatalyst powder (ZnO/0.5% Mn-CdS) in example 2 obtained in the present invention was used for degrading RhB under the following test conditions: preparing a RhB solution with the concentration of 5mg/L, taking 100ml of the RhB solution, ultrasonically dispersing a 100mg powder sample into the RhB solution, continuously stirring for 30min under a dark condition to enable the RhB solution to achieve full and complete adsorption-desorption, simulating sunlight illumination for 80min under a 300W xenon lamp, taking a sample every 20min to be tested for absorbance evaluation, and as can be seen from FIG. 4, the CdS nanoparticle modified ZnO nanoflower obtained by the invention has excellent photocatalytic performance.
For example 3:
the photocatalyst powder (ZnO/1% Mn-CdS) in example 3 obtained in the present invention was used for degrading RhB under the following test conditions: preparing a RhB solution with the concentration of 5mg/L, taking 100ml of the RhB solution, ultrasonically dispersing a 100mg powder sample into the RhB solution, continuously stirring for 30min under a dark condition to enable the RhB solution to achieve full and complete adsorption-desorption, simulating sunlight illumination for 80min under a 300W xenon lamp, taking a sample every 20min to be tested for absorbance evaluation, and as can be seen from FIG. 4, the CdS nanoparticle modified ZnO nanoflower obtained by the invention has excellent photocatalytic performance.
Fig. 4 is a comparative graph of the photocatalytic degradation RhB performance of comparative example, example 1, example 2 and example 3, the X-axis is adsorption-desorption time, the Y-axis represents the photocatalytic degradation rate of RhB, and as can be seen from fig. 4, the degradation rate of the ZnO nanoflowers obtained in the comparative example of the present invention is less than 40% after 60min under the condition of simulated sunlight, and the degradation rate of the CdS nanoparticle modified ZnO nanoflowers obtained in example 1 is close to 75% after 60min under the condition of simulated sunlight, which indicates that the CdS nanoparticle modified ZnO nanoflowers prepared in the present invention has more excellent photocatalytic degradation performance.
As can be seen from comparison of the present invention in example 1, example 2 and example 3, the ZnO/1% Mn-CdS obtained in example 3 of the present invention has significantly better properties than the CdS nanoparticle-modified ZnO nanoflower (ZnO/CdS) in example 1 and the ZnO/0.5% Mn-CdS obtained in example 2.
Compared with the related art, the preparation method and application of the CdS nanoparticle-doped ZnO nanoflower powder provided by the invention have the following beneficial effects:
the preparation method of the ZnO nanoflower powder coated by the doped CdS nanoparticles provided by the invention greatly improves the absorption rate of ZnO to visible light, and the quantum dot modification greatly improves the specific surface area of ZnO, so that excellent photocatalytic activity is obtained, and the preparation method is an excellent photocatalyst, and the preparation process is relatively simple, is suitable for large-scale mass production, and has a considerable application potential.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (3)
1. The preparation method of the CdS nanoparticle-doped coated ZnO nanoflower powder is characterized by comprising the following steps of:
s1, dissolving zinc nitrate hexahydrate in deionized water and uniformly stirring to obtain a colorless transparent solution A; dissolving hexamethylenetetramine in deionized water, stirring uniformly, adding the solution into the solution A, and dropwise adding sodium hydroxide solution into the solution A until white floccules appear in the turbid solution to obtain solution B; stirring the solution B, transferring the solution B to a hydrothermal reaction kettle, heating and preserving heat for 6-72h, and waiting for the hydrothermal reaction kettle to cool to room temperature to obtain a white precipitate product;
s2, washing and centrifuging the white precipitate obtained in the step S1 by deionized water and ethanol, and drying to obtain ZnO nanoflower precursor powder;
s3, dispersing the ZnO nanoflower precursor powder obtained in the step S2 into a three-bevel-mouth flask, continuously stirring, adding a sodium sulfide solution into the three-bevel-mouth flask, preparing 100ml of cadmium acetate solution, and adding into the reaction system to react for 0.5-6h;
s4, finally centrifugally separating out and drying in a drying oven to obtain ZnO nanoflower powder coated by doped CdS nanoparticles;
in the step S1, the obtained white precipitate is a flower-shaped ZnO precursor, and the flower-shaped ZnO precursor is synthesized in an auxiliary way by taking zinc nitrate hexahydrate, hexamethylenetetramine and sodium hydroxide as auxiliary reactants, and is generated by hydrothermal reaction for 6-72h at 90-140 ℃;
in the step S1, the sodium hydroxide solution is configured to be 2mol/L, the pH value of the solution B is controlled between 7 and 14, and the heat preservation time in a hydrothermal reaction kettle is between 6 and 72 hours;
in the step S3, manganese ions are added into the prepared cadmium acetate solution in different molar ratios for doping, and the doping ratio of the manganese ions ranges from 1% to 10%.
2. The method for preparing the ZnO nanoflower powder coated with doped CdS nanoparticles according to claim 1, wherein in the step S2, the white precipitate is centrifuged twice with deionized water and once with ethanol, and the centrifugation is performed at 7000rpm for 5min, and then dried in an oven for 12h at a drying temperature of 50 ℃.
3. A use of the CdS nanoparticle-coated ZnO nanoflower powder obtained by the method for preparing the CdS nanoparticle-coated ZnO nanoflower powder of claim 1 or 2 in photocatalytic degradation of organic pollutants.
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|---|---|---|---|---|
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