CN111547761A - Method for preparing zinc oxide by microwave assisted sol-gel hydrothermal method - Google Patents
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 102
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- 230000008569 process Effects 0.000 claims abstract description 5
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- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
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- 239000011701 zinc Substances 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 4
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000011592 zinc chloride Substances 0.000 claims description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical group [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Inorganic materials [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 241000894006 Bacteria Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
Abstract
The invention belongs to the technical field of zinc oxide preparation, and particularly discloses a method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method, which comprises the following steps: dissolving soluble zinc salt in water to form a solution A, adding an acidic buffer solvent into the solution A, stirring to completely dissolve the solution A, and adjusting the pH value of the solution A to 8-9 to obtain a solution B; putting the solution B into a microwave chemical reactor, and stirring to perform microwave reaction; then adding a template agent to generate gel; and transferring the gel into a hydrothermal kettle, carrying out hydrothermal reaction, removing impurities from the precipitate, and drying to obtain the zinc oxide. The method combines the advantages of a hydrothermal method and a sol-gel method, firstly promotes the formation of sol-gel by microwave, and then adds a template agent in the hydrothermal reaction process, thereby generating the nano zinc oxide with a multilayer structure. The method has simple steps and easily controlled reaction conditions, and can be applied to industrial large-scale production.
Description
Technical Field
The invention relates to the technical field of zinc oxide preparation, in particular to a method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method.
Background
The zinc oxide can be applied to fields such as semiconductor devices, catalysts, sensors, electric components and the like. Originally, zinc oxide was widely used as a common chemical additive in the manufacture of plastics, silicate products, synthetic rubber, lubricating oil, paint coatings, ointments, adhesives, foods, batteries, flame retardants, and the like. The zinc oxide has large energy band gap and exciton constraint energy, high transparency and excellent normal temperature luminous performance, and is applied to products such as liquid crystal displays, thin film transistors, light emitting diodes and the like in the semiconductor field. At present, the nano zinc oxide has more purposes, can kill bacteria under sunlight, particularly under ultraviolet irradiation, shields materials by ultraviolet light, can be spun to prepare the ultraviolet-resistant optical fiber, and has the functions of antibiosis, disinfection and deodorization. Besides the function of shielding ultraviolet light, the ultraviolet light shielding material can also be applied to household electrical appliances, kitchen supplies, medical and sanitary wares, synthetic fibers, daily necessities, toys, electronic communication, fluorescent materials, photocatalytic materials and the like.
The current methods for preparing the nano zinc oxide include a solid phase method, a gas phase method, a liquid phase method, a microemulsion method, a hydrothermal method and a solvothermal method. The principle of preparing the nano zinc oxide by the liquid phase method is that zinc salt solution is subjected to a series of chemical reactions including oxidation-reduction reaction, precipitation reaction and the like to finally obtain a zinc oxide nano structure; the liquid phase method includes a sol-gel method, a micro-emulsion method, a hydrothermal method and a solvothermal method. The sol-gel method is that gel compound is used as precursor, the raw materials are mixed evenly in liquid phase, hydrolysis and condensation chemical reaction are carried out, a stable transparent sol system is formed in solution, the sol is slowly polymerized among aged colloidal particles to form gel with a three-dimensional network structure, the gel network is filled with solvent losing fluidity to form gel, and then the material with a nano structure is obtained through drying and sintering. The hydrothermal method is to heat an aqueous solution reaction system in an autoclave to generate a high-temperature high-pressure environment, accelerate an ion reaction and a hydrolysis reaction, prepare an oxide in an aqueous solution or steam, and finally obtain oxide nanoparticles through separation and heat treatment. The solvothermal method is to change the solvent water in the hydrothermal method into other solvents so as to further change the temperature and pressure of the reaction and further obtain nano products with different shapes.
However, the above method has the following problems: 1) when the sol-gel method is adopted to synthesize the zinc oxide, the product yield is low, and the obtained zinc oxide has larger granularity and is easy to agglomerate. 2) The hydrothermal method (solvothermal method) is adopted to synthesize the zinc oxide, the synthesis time is long, and the production efficiency is low.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for preparing zinc oxide by microwave assisted sol-gel hydrothermal method, which combines sol-gel method and hydrothermal method (solvothermal method) to shorten the synthesis time and obtain ZnO with higher yield and uniform morphology.
In order to achieve the above objects and other related objects, the present invention provides a method for preparing zinc oxide by microwave assisted sol-gel hydrothermal method, comprising the steps of:
(1) dissolving soluble zinc salt in water to form a solution A, adding an acidic buffer solvent into the solution A, stirring to completely dissolve the solution A, and adjusting the pH value of the solution A to 8-9 to obtain a solution B;
(2) putting the solution B into a microwave chemical reactor, and stirring to perform microwave reaction;
(3) then adding a template agent to generate gel;
(4) and transferring the gel into a hydrothermal kettle, carrying out hydrothermal reaction, removing impurities from the precipitate, and drying to obtain the zinc oxide.
Furthermore, the mol ratio of the soluble zinc salt to the template agent is (2-15) to 1.
Further, the method can be used for preparing a novel materialIn the step (1), the soluble zinc salt is selected from ZnCl2、Zn(NO3)2·6H2O、Zn(CH3COO)2、Zn3(C6H5O7)2·2H2And O is one of the groups.
Further, in the step (1), the amount of the acidic buffer solvent added is 0.5 to 2 g.
Further, in the step (1), the acidic buffer solvent is one selected from citric acid, oxalic acid or stearic acid.
Further, in the step (1), the reagent for adjusting the pH of the solution a is at least one selected from the group consisting of ammonia, sodium hydroxide, and potassium hydroxide.
Further, in the step (2), the microwave power is 40-80 w.
Further, in the step (2), the microwave reaction time is 4-10min, preferably 5-8min, and more preferably 6 min.
Further, in the step (3), the template is selected from one of Cetyl Trimethyl Ammonium Bromide (CTAB), pyrrolidine, ethylenediamine and n-butylamine.
Further, in the step (4), the temperature of the hydrothermal reaction is 100-.
Further, in the step (4), the hydrothermal reaction time is 2-8h, preferably 3-6h, and more preferably 5 h.
Further, in the step (4), the impurity removal and drying steps of the precipitate are as follows: washing the precipitate with ethanol and deionized water, removing impurities, and drying at 50-80 deg.C for 2-8h to obtain zinc oxide.
The invention also provides zinc oxide prepared by the method.
As mentioned above, the method for preparing zinc oxide by microwave assisted sol-gel hydrothermal method of the invention has the following beneficial effects:
the invention firstly promotes the formation of sol-gel by microwave, and adds a template agent in the hydrothermal reaction process to form a multilayer microstructure under specific conditions. The experimental process combines the advantages of hydrothermal and sol-gel processes, so that the synthesis time is shortened, and the nano zinc oxide with a multilayer structure and uniform appearance is generated, so that the nano zinc oxide can become a nano zinc oxide material with better piezoelectric activity.
The method has the advantages of simple steps, easily controlled reaction conditions, short synthesis time and high zinc oxide yield, and can be applied to the industrial large-scale production of zinc oxide.
Drawings
FIG. 1 shows physical diagrams of ZnO as the product obtained in examples 1 to 7 of the present invention.
Figure 2 shows the X-ray diffraction (XRD) pattern of the product of example 1 of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The acidic buffer solvents in the following examples all adopt citric acid, and can also adopt oxalic acid or stearic acid; the template agent adopts Cetyl Trimethyl Ammonium Bromide (CTAB), and also can adopt pyrrolidine, ethylenediamine or n-butylamine; the reagent for adjusting the pH value of the solution A adopts concentrated ammonia water, and sodium hydroxide or potassium hydroxide can also be adopted.
The specific implementation process is as follows:
example 1
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.01mol of ZnCl is weighed by a precision balance2(1.363g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 6min under the microwave power of 40 w.
(5) Subsequently, 0.005mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 5h at 120 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample I.
Example 2
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.02mol of ZnCl is weighed by a precision balance2(2.726g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 1g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 6min under the microwave power of 60 w.
(5) Subsequently, 0.01mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 5h at 120 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample II.
Example 3
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.015mol of ZnCl is weighed by a precision balance2(2.0445g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 6min at the microwave power of 80 w.
(5) Subsequently, 0.01mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 5h at the temperature of 150 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample III.
Example 4
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.03mol of ZnCl is weighed by a precision balance2(4.089g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 4min under the microwave power of 60 w.
(5) Subsequently, 0.005mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 8h at the temperature of 100 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample IV.
Example 5
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.03mol of Zn (NO) is weighed by a precision balance3)2·6H2O (4.462g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 8min at the microwave power of 100 w.
(5) Subsequently, 0.01mol of CTAB (cetyltrimethylammonium bromide) (3.644g) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 2h at 180 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample V.
Example 6
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) first, 0.03mol of Zn (CH) is weighed by a precision balance3COO)2(2.7522g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 6min at the microwave power of 100 w.
(5) Subsequently, 0.01mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 5h at 120 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample six.
Example 7
A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method comprises the following steps:
(1) firstly, 0.03mol of Zn is weighed by a precision balance3(C6H5O7)2·2H2O (9.156g) was dissolved in 20ml of an aqueous solution to form solution A.
(2) 0.5g of citric acid was added to the solution A, and the mixture was stirred to be completely dissolved.
(3) And (3) placing the beaker filled with the solution A on a magnetic stirrer for stirring, and dropwise adding concentrated ammonia water to enable the pH value to be 8-9, so as to obtain a colorless transparent solution B.
(4) And (3) putting the solution B into a microwave chemical reactor, and carrying out magnetic stirring treatment for 10min at the microwave power of 100 w.
(5) Subsequently, 0.01mol of CTAB (cetyltrimethylammonium bromide) was added to the solution B under stirring, to give a gel.
(6) The gel was transferred to a 50ml stainless steel hot kettle lined with teflon and supplemented with deionized water to 80% by volume.
(7) Carrying out hydrothermal treatment for 5h at 120 ℃, and then naturally cooling to room temperature.
(8) And washing the white precipitate with ethanol and deionized water for several times to remove impurities, and finally drying at 50 ℃ for 5 hours to obtain a ZnO sample seven.
FIG. 1 shows physical diagrams of ZnO as the products obtained in examples 1 to 7.
The samples obtained in examples 1-7 were characterized by X-ray diffraction (XRD) and the results are shown in fig. 2. As can be seen from FIG. 2, the product obtained by the method is zinc oxide.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method for preparing zinc oxide by a microwave assisted sol-gel hydrothermal method is characterized by comprising the following steps:
(1) dissolving soluble zinc salt in water to form a solution A, adding an acidic buffer solvent into the solution A, stirring to completely dissolve the solution A, and adjusting the pH value of the solution A to 8-9 to obtain a solution B;
(2) putting the solution B into a microwave chemical reactor, and stirring to perform microwave reaction;
(3) then adding a template agent to generate gel;
(4) and transferring the gel into a hydrothermal kettle, carrying out hydrothermal reaction, removing impurities from the precipitate, and drying to obtain the zinc oxide.
2. The method of claim 1, wherein: the mol ratio of the soluble zinc salt to the template agent is (2-15) to 1.
3. The method of claim 1, wherein: in the step (1), the soluble zinc salt is selected from ZnCl2、Zn(NO3)2·6H2O、Zn(CH3COO)2、Zn3(C6H5O7)2·2H2And O is one of the compounds.
4. The method of claim 1, wherein: in the step (3), the template is selected from one of Cetyl Trimethyl Ammonium Bromide (CTAB), pyrrolidine, ethylenediamine and n-butylamine.
5. The method of claim 1, wherein: in the step (1), the adding amount of the acidic buffer solvent is 0.5-2 g;
and/or, in the step (1), the acidic buffer solvent is selected from one of citric acid, oxalic acid or stearic acid.
6. The method of claim 1, wherein: in the step (1), the reagent for adjusting the pH value of the solution A is at least one selected from ammonia water, sodium hydroxide and potassium hydroxide.
7. The method of claim 1, wherein: in the step (2), the microwave power is 40-80 w;
and/or, in the step (2), the microwave reaction time is 4-10min, preferably 5-8min, and more preferably 6 min.
8. The method of claim 1, wherein: in the step (4), the temperature of the hydrothermal reaction is 100-180 ℃, preferably 100-150 ℃, and more preferably 120 ℃;
and/or in the step (4), the hydrothermal reaction time is 2-8h, preferably 3-6h, and more preferably 5 h.
9. The method of claim 1, wherein: in the step (4), the impurity removal and drying steps of the precipitate are as follows: washing the precipitate with ethanol and deionized water, removing impurities, and drying at 50-80 deg.C for 2-8h to obtain zinc oxide.
10. Zinc oxide prepared according to the process of any one of claims 1 to 9.
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