CN109126802B - Two-dimensional porous Co3O4Preparation method of-ZnO composite nanosheet - Google Patents
Two-dimensional porous Co3O4Preparation method of-ZnO composite nanosheet Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 239000002135 nanosheet Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 12
- 239000002064 nanoplatelet Substances 0.000 claims abstract description 10
- 238000007598 dipping method Methods 0.000 claims abstract description 8
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 244000284380 Hibiscus rosa sinensis Species 0.000 claims description 20
- 235000000664 Rosa chinensis Nutrition 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 241000196324 Embryophyta Species 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 14
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000012266 salt solution Substances 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical group [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 5
- 238000003760 magnetic stirring Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 4
- 150000001868 cobalt Chemical class 0.000 claims description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 150000003751 zinc Chemical class 0.000 claims description 4
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 3
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 3
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 3
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 3
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 3
- 229940044175 cobalt sulfate Drugs 0.000 claims description 3
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 244000144730 Amygdalus persica Species 0.000 claims description 2
- 240000001548 Camellia japonica Species 0.000 claims description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 2
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 2
- 235000018597 common camellia Nutrition 0.000 claims description 2
- 239000004246 zinc acetate Substances 0.000 claims description 2
- 238000005470 impregnation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000002055 nanoplate Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 230000001699 photocatalysis Effects 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 2
- 229960000907 methylthioninium chloride Drugs 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000010718 Oxidation Activity Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/80—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with zinc, cadmium or mercury
-
- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
Abstract
The invention discloses two-dimensional porous Co3O4-a method of preparing ZnO composite nanoplates, the method comprising: (1) collecting plant petals, and pretreating the plant petals to form a petal template; (2) dipping the template; (3) taking out the impregnated template, cleaning, soaking, drying, calcining in a muffle furnace and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets. The invention relates to two-dimensional porous Co3O4The preparation method of the-ZnO composite nanosheet is simple, the raw materials are wide in source, low in cost and green and pollution-free, the prepared material has a unique two-dimensional porous structure and high catalytic activity and thermal stability, and when the material is applied to purification treatment of organic dye wastewater, the organic dye wastewater can be effectively catalytically degraded.
Description
Technical Field
The invention relates to a preparation method of a two-dimensional porous composite nanosheet, in particular to a two-dimensional porous Co nanosheet3O4A preparation method of-ZnO composite nanosheets, belonging to the technical field of semiconductor photocatalysis.
Background
With the continuous advance of industrialization, the environmental problem caused by organic pollution is increasingly serious, and the semiconductor photocatalysis technology is taken as a pollution-free and sustainable green technology, and is more and more valued by people because the semiconductor photocatalysis technology can solve the increasingly serious environmental pollution problem by utilizing solar energy. The traditional photocatalyst is limited in application due to the defects of wide forbidden band width, easy recombination of photon-generated carriers and the like. In recent years, semiconductor composite materials have higher photocatalytic activity due to large visible light absorption range, high separation rate of photon-generated carriers, high oxidation activity and high charge mobility, and gradually become a research hotspot in the field of novel photocatalyst development in recent years.
Research shows that the photocatalytic activity of the catalyst is related to the properties of the material, and the photocatalytic efficiency of the catalyst is influenced by the difference of the morphology, the size and the structure of the catalyst. Therefore, in recent years, people try to adopt various methods to prepare advanced materials with various shapes so as to obtain higher specific surface area and construct more carrier catalytic centers, thereby improving the photocatalytic performance.
In recent years, due to the discovery and research of graphene, two-dimensional nano-thin layer materials with the thickness in the nanometer scale and the transverse scale in the submicron to micron scale attract a lot of attention. Two-dimensional materials have quite different properties compared to their three-dimensional structures, and are expected to be applied to various fields such as electronics, separation, catalysis, and sensors. But the traditional method using surfactant as medium is difficult to control and synthesize two-dimensional nano thin layer material in two-dimensional space.
Unlike artificial manufacturing, nature creates a large number of biological tissues at all levels with layered porous structures, which opens up new opportunities for synthesizing novel materials. In fact, the biological template method has embodied its advantages in synthesizing various materials with different morphological structures. The biological tissues are used as templates, can be regenerated and used, are easy to clean, are very environment-friendly, and have excellent effect in the fields of photoelectric conversion, catalysts and the like. This inspired us to use the plant petal as the template, and utilize the natural lamellar structure in the cell tissue structure to synthesize two-dimensional porous Co3O4-ZnO composite nanosheets, and the material is applied to catalytic treatment of organic dye wastewater.
Disclosure of Invention
The technical problem to be solved is as follows: the invention aims to provide two-dimensional porous Co with low cost, mild reaction conditions and simple process3O4A preparation method of-ZnO composite nanosheets.
In order to achieve the above purpose, the invention provides two-dimensional porous Co3O4The preparation method of the-ZnO composite nanosheet is simple and flexible in process and low in cost. The method comprises the steps of taking plant petals as a template, introducing a metal salt solution into a petal cell tissue structure by a dipping and permeating method, copying the microscopic appearance of the petals, and synthesizing a two-dimensional porous Co3O4-ZnO compositeNanosheets.
The technical scheme is as follows: two-dimensional porous Co3O4The preparation method of the-ZnO composite nanosheet is characterized by comprising the following steps.
(1) And (4) preparing a template.
Collecting plant petals, washing off visible stains on the surfaces of the plant petals, soaking the plant petals in an ethanol-water mixed solution, regulating the pH value to 3 by using hydrochloric acid with the mass fraction of 5%, soaking for 4 hours, taking out the plant petals, washing the plant petals to be neutral by using deionized water, and then placing the plant petals in a super-clean workbench for natural airing to form a petal template.
(2) And (5) dipping the template.
(2-1) dispersing 1-4 g of the petal templates obtained in the step (1) in 200-400 mL of a nonpolar organic solvent to form a mixed solution A.
(2-2) dissolving cobalt salt and zinc salt in water to prepare a mixture with a molar ratio of 1: 1, denoted as solution B; and the total concentration of the metal salt solution in the aqueous solution is 0.01-1 mol/L.
(2-3) taking 2-20 mL of the solution B, dropwise adding the solution B into the mixed solution A under magnetic stirring, and continuously stirring and dipping for 6-48 h.
(3) Preparation of two-dimensional porous Co3O4-ZnO composite nanoplatelets.
Taking out the template dipped in the step (2-3), washing with deionized water for several times, drying at 60 ℃, calcining in a muffle furnace at 500 ℃ for 1-3 h, and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets.
The nonpolar organic solvent in the step (2-1) is n-pentane, n-hexane, n-heptane or cyclohexane.
The cobalt salt in the step (2-2) is cobalt chloride, cobalt sulfate or cobalt nitrate; the zinc salt is zinc chloride, zinc nitrate, zinc acetate or zinc sulfate.
The petals are any one of Chinese rose petals, camellia petals and peach flower petals, and are not limited to the types of the petals.
The invention has the beneficial effects that: the invention relates to two-dimensional porous Co3O4Preparation method of-ZnO composite nanosheetThe method is simple, does not need complex equipment, has low cost, has wide sources of petal templates, is reproducible, is easy to remove, has no pollution to the environment, and has good experimental repeatability. The material has a unique two-dimensional porous structure, good biocompatibility, high catalytic activity and high stability, and can effectively catalyze and degrade organic dye wastewater when being applied to the purification treatment of the organic dye wastewater.
Drawings
FIG. 1 is a two-dimensional porous Co prepared in example 13O4-back scanning electron microscope photograph of ZnO composite nanosheet.
FIG. 2 is a two-dimensional porous Co prepared in example 13O4And (4) a back scanning electron microscope local magnification picture of the ZnO composite nanosheet.
FIG. 3 is a two-dimensional porous Co prepared in example 23O4-front scanning electron microscope photograph of ZnO composite nanosheet.
FIG. 4 is a two-dimensional porous Co prepared in example 33O4A catalytic effect curve diagram of the ZnO composite nanosheet.
Detailed Description
In order to make the technical solution of the present invention more clear, the present invention is further described in detail with reference to the following embodiments.
Example 1.
(1) And (4) preparing a template.
Collecting Chinese rose petals, washing off visible stains on the surfaces of the Chinese rose petals, soaking the Chinese rose petals in an ethanol-water mixed solution, regulating the pH value to 3 by using hydrochloric acid with the mass fraction of 5%, soaking for 4h, taking out the Chinese rose petals, washing the Chinese rose petals to be neutral by using deionized water, and then placing the Chinese rose petals in a super-clean workbench for naturally airing to form a petal template.
(2) And (5) dipping the template.
A mixture A was prepared by dispersing 4g of the petal template in 400mL of n-heptane. Dissolving cobalt nitrate and zinc nitrate in water to prepare a mixture with a molar ratio of 1: 1, denoted as solution B; and the total concentration of the metal salt solution in the aqueous solution is 0.5 mol/L. 14mL of solution B was added dropwise to the mixture A under magnetic stirring, and the mixture was immersed for 12h with constant stirring.
(3) Preparation of two-dimensional porous Co3O4-ZnO composite nanoplatelets.
Taking out the impregnated template, washing with deionized water for several times, drying at 60 ℃, calcining in a muffle furnace at 500 ℃ for 2h, and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets.
FIG. 1 shows a two-dimensional porous Co prepared in example 1 of the present invention3O4-back scanning electron microscope photograph of ZnO composite nanosheet. As shown in fig. 1: the sample in fig. 1 retained the micron scale-like structure on the back of the petals.
FIG. 2 is a two-dimensional porous Co prepared in example 1 of the present invention3O4And (4) a back scanning electron microscope local magnification picture of the ZnO composite nanosheet. As shown in fig. 2: the fold shape of the petal template is almost completely preserved.
Example 2.
(1) And (4) preparing a template.
Collecting Chinese rose petals, washing off visible stains on the surfaces of the Chinese rose petals, soaking the Chinese rose petals in an ethanol-water mixed solution, regulating the pH value to 3 by using hydrochloric acid with the mass fraction of 5%, soaking for 4h, taking out the Chinese rose petals, washing the Chinese rose petals to be neutral by using deionized water, and then placing the Chinese rose petals in a super-clean workbench for naturally airing to form a petal template.
(2) And (5) dipping the template.
A petal template (3 g) was dispersed in 400mL of cyclohexane to prepare a mixed solution A. Dissolving cobalt chloride and zinc chloride in water to prepare a mixture with a molar ratio of 1: 1, denoted as solution B; and the total concentration of the metal salt solution in the aqueous solution is 0.4 mol/L. 7mL of solution B was added dropwise to the mixture A under magnetic stirring, and the mixture was immersed for 24h with continuous stirring.
(3) Preparation of two-dimensional porous Co3O4-ZnO composite nanoplatelets.
Taking out the impregnated template, washing with deionized water for several times, drying at 60 ℃, calcining in a muffle furnace at 500 ℃ for 2h, and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets.
FIG. 3 is a two-dimensional porous Co prepared in example 2 of the present invention3O4-front scanning electron microscope photograph of ZnO composite nanosheet. As shown in fig. 3: in FIG. 3, it can be clearly seen that the front appearance of the petal template is completely preserved, and the petal template has an irregular micro-bowl structure and a diameter of about 5-8 μm.
Example 3.
(1) And (4) preparing a template.
Collecting Chinese rose petals, washing off visible stains on the surfaces of the Chinese rose petals, soaking the Chinese rose petals in an ethanol-water mixed solution, regulating the pH value to 3 by using hydrochloric acid with the mass fraction of 5%, soaking for 4h, taking out the Chinese rose petals, washing the Chinese rose petals to be neutral by using deionized water, and then placing the Chinese rose petals in a super-clean workbench for naturally airing to form a petal template.
(2) And (5) dipping the template.
A petal template (2 g) was dispersed in 200mL of n-heptane to prepare a mixed solution A. Dissolving cobalt sulfate and zinc sulfate in water to prepare a mixture with a molar ratio of 1: 1, denoted as solution B; and the total concentration of the metal salt solution in the aqueous solution is 0.2 mol/L. And (3) dropwise adding 10mL of the solution B into the mixed solution A under magnetic stirring, and continuously stirring and soaking for 6-48 h.
(3) Preparation of two-dimensional porous Co3O4-ZnO composite nanoplatelets.
Taking out the impregnated template, washing with deionized water for several times, drying at 60 ℃, calcining in a muffle furnace at 500 ℃ for 3h, and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets.
FIG. 4 is a two-dimensional porous Co prepared in example 3 of the present invention3O4A catalytic effect curve diagram of the ZnO composite nanosheet. As shown in fig. 4: after 2h, Co3O4The degradation rate of the-ZnO composite nanosheet to methylene blue solution reaches 98%, and Co without a template3O4The degradation rate of the catalyst on methylene blue solution is about 57%, and the reaction rate is improved by 41%.
Claims (4)
1. Two-dimensional porous Co3O4A preparation method of the-ZnO composite nano-sheet, which is characterized in thatThe method comprises the following steps:
(1) preparation of the template
Collecting plant petals, washing off visible stains on the surfaces of the plant petals, soaking the plant petals in an ethanol-water mixed solution, regulating the pH value to 3 by using hydrochloric acid with the mass fraction of 5%, soaking for 4 hours, taking out the plant petals, washing the plant petals to be neutral by using deionized water, and then naturally airing the plant petals in a super-clean workbench to form a petal template;
(2) impregnation template
(2-1) dispersing 1-4 g of the petal template obtained in the step (1) in 200-400 mL of a nonpolar organic solvent to form a mixed solution A;
(2-2) dissolving cobalt salt and zinc salt in water to prepare a mixture with a molar ratio of 1: 1, denoted as solution B; the total concentration of the metal salt solution in the aqueous solution is 0.01-1 mol/L;
(2-3) dropwise adding 2-20 mL of the solution B into the mixed solution A under magnetic stirring, and continuously stirring and dipping for 6-48 h;
(3) preparation of two-dimensional porous Co3O4-ZnO composite nanosheet
Taking out the template dipped in the step (2-3), washing with deionized water for several times, drying at 60 ℃, calcining in a muffle furnace at 500 ℃ for 1-3 h, and naturally cooling to obtain the two-dimensional porous Co3O4-ZnO composite nanoplatelets.
2. A two-dimensional porous Co according to claim 13O4The preparation method of the-ZnO composite nanosheet is characterized by comprising the following steps: the nonpolar organic solvent in the step (2-1) is n-pentane, n-hexane, n-heptane or cyclohexane.
3. A two-dimensional porous Co according to claim 13O4The preparation method of the-ZnO composite nanosheet is characterized by comprising the following steps: the cobalt salt in the step (2-2) is cobalt chloride, cobalt sulfate or cobalt nitrate; the zinc salt is zinc chloride, zinc nitrate, zinc acetate or zinc sulfate.
4. The method of claim 1Two-dimensional porous Co3O4The preparation method of the-ZnO composite nanosheet is characterized by comprising the following steps: the petal is any one of Chinese rose petal, camellia petal and peach flower petal.
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