CN115228461A - Ag modified In 2 O 3 Material, preparation method and application thereof - Google Patents

Ag modified In 2 O 3 Material, preparation method and application thereof Download PDF

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CN115228461A
CN115228461A CN202210891169.5A CN202210891169A CN115228461A CN 115228461 A CN115228461 A CN 115228461A CN 202210891169 A CN202210891169 A CN 202210891169A CN 115228461 A CN115228461 A CN 115228461A
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mil
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陈枫
李树奎
包烜墉
路国婧
蒋保江
郑芒
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Shenzhen Zhongke Hydrogen Technology Co ltd
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Shenzhen Zhongke Hydrogen Technology Co ltd
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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
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
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    • 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
    • B01J23/08—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of gallium, indium or thallium
    • 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
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39—Photocatalytic properties
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    • 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
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    • B01J37/086—Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
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    • 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
    • B01J37/30—Ion-exchange
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    • C01B32/40—Carbon monoxide
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    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
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    • C07C1/02—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon

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Abstract

The invention relates to the technical field of photocatalytic materials, in particular to Ag modified In 2 O 3 A material and a preparation method and application thereof. The preparation method comprises the steps of carrying out the reaction of indium salt and organic ligand under the condition of solvothermal reactionForming a precursor MIL-68 (In); then the MIL-68 (In) is converted into In by adopting a high-temperature calcination mode 2 O 3 (ii) a Then the In is treated by a cation exchange method 2 O 3 Synthesizing to obtain Ag modified In 2 O 3 A material. The synthesis method is simple and convenient, is convenient to operate and is beneficial to further realizing industrialization. At the same time, precursor MIL-68 (In) is used as template In 2 O 3 The prepared Ag can be modified with In 2 O 3 The material follows MIL-68 (In) rod-shaped structure, thereby being beneficial to CO 2 The material has high catalytic activity and circulation stability, and can reach good CO at normal temperature and normal pressure 2 Reducing effect, and no pollution is generated in the process of using water as a proton source.

Description

Ag modified In 2 O 3 Material, preparation method and application thereof
Technical Field
The invention relates to the technical field of photocatalytic materials, in particular to Ag modified In 2 O 3 A material, a preparation method and application thereof.
Background
With the industrial revolution, the large consumption of fossil energy has resulted in carbon dioxide (chemical formula CO) 2 ) The concentration of (2) is increasing, accelerating global warming and greenhouse effect. To solve these problems, there is an urgent need to develop CO with sustainable development and low cost 2 And (4) transformation technology. Semiconductor photocatalytic CO 2 Reduction technique called artificial photosynthesis, which can reduce global CO 2 While accumulating, provide high value-added hydrocarbons. CO conversion by semiconductor photocatalysis 2 The synthesis of chemicals with high added value also provides an effective way for slowing down global warming and greenhouse effect.
Indium oxide (In) 2 O 3 ) As a typical N-type semiconductor, the material has the characteristics of good conductivity, excellent oxidation-reduction performance and the like, and is widely applied to photocatalysis of CO 2 Reduction and the like. However, for photocatalytic CO 2 The reduction reaction process has poor reactivity and poor cycle stability,and the reaction disadvantages of high temperature and high pressure are not solved yet.
Disclosure of Invention
To solve the above technical problems, the present invention is directed to solving the problem of photocatalytic CO 2 The reduction reaction process has the disadvantages of poor reactivity and circulation stability, and high temperature and high pressure. The invention provides Ag modified In 2 O 3 A material and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect of the invention, ag modifies In 2 O 3 A method for preparing a material, the method comprising synthesizing a precursor MIL-68 (In) by an indium salt and an organic ligand under solvothermal reaction conditions; then the MIL-68 (In) is converted into In by adopting a high-temperature calcination mode 2 O 3 (ii) a Then making said In pass through cation exchange method 2 O 3 Synthesizing to obtain Ag modified In 2 O 3 A material.
Further, the method specifically comprises the following steps: (1) Weighing 1-15 parts of indium salt, dissolving in 10-60 parts of organic solvent, and stirring for 10-60 min; adding 1-15 parts of organic ligand, and continuously stirring for 1-4h to obtain a mixed solution; transferring the mixed solution into a hydrothermal kettle, setting the temperature to be 100-180 ℃, reacting for 1-7 h, and centrifuging and collecting to obtain a precursor MIL-68 (In); (2) Weighing 1-15 parts of MIL-68 (In), placing In a muffle furnace, calcining at 100-600 ℃ for 1-6 h to obtain In 2 O 3 (ii) a (3) Weighing 1-15 parts of silver salt, dissolving in 10-50 parts of solution, and performing ultrasonic treatment for 5-30 min; then adding 1 to 15 parts of the In 2 O 3 Mixing and stirring for 1-6 h, and centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
Further, in the step (1), the addition amount of the indium salt is 1 to 13 parts; the adding amount of the organic solvent is 10 to 45 portions; the adding amount of the organic ligand is 1 to 10 parts.
Further, in the step (1), the indium salt is one or more of indium nitrate, indium chloride, indium antimonide and indium selenide; the organic solvent is one or more of ethanol, methanol, isopropanol, N-dimethyl amide or acetone; the organic ligand is one or more of nitroterephthalic acid, tetrafluoroterephthalic acid, terephthalic acid or diaminoterephthalic acid.
Further, in the step (2), the MIL-68 (In) is added In an amount of 5 to 13 parts.
Further, in the step (3), the silver salt is silver nitrate, silver chloride, silver acetate or silver powder, and the solution is an ethanol solution, a methanol solution, an aqueous solution, an acetone solution, an ethylene glycol solution or an isopropanol solution.
Further, the adding amount of the silver salt is 1 to 12 parts, and the using amount of the solution is 10 to 45 parts; the ultrasonic treatment time is 10-30 min.
Further, in the step (3), the In 2 O 3 The adding amount of (1) is 5-13 parts, and the mixing and stirring time is 2-6 h.
In a second aspect of the invention, ag modified In is provided 2 O 3 Materials, e.g. Ag modified In as described above 2 O 3 Ag modified In prepared by material preparation method 2 O 3 A material.
In a third aspect of the invention, there is provided Ag-modified In as described above 2 O 3 Material in photocatalysis of CO 2 Application in reduction reaction.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
the invention provides Ag modified In 2 O 3 The preparation method comprises the steps of synthesizing MIL-68 (In) by selecting indium salt and an organic ligand under the condition of solvothermal reaction through a template method; then In is synthesized by adopting a high-temperature calcination mode 2 O 3 Then carrying out cation exchange reaction In silver nitrate aqueous solution to finally obtain Ag modified In 2 O 3 . The synthesis method is simple and convenient, is convenient to operate and is beneficial to further realizing industrialization. At the same time, precursor MIL-68 (In) is used as template In 2 O 3 The prepared Ag can be modified with In 2 O 3 The material follows MIL-68 (In) rod-shaped structure, thereby being beneficial to CO 2 The material has higher catalytic activity and cycle stability, and can reach better CO at normal temperature and normal pressure 2 Reducing effect, and no pollution is generated in the process of using water as proton source.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, and the drawings are not to scale.
FIG. 1 shows In derived from the precursor MIL-68 (In) In example 1 2 O 3 Scanning electron microscope images of (a);
FIG. 2 shows Ag modified In obtained In example 1 2 O 3 A scanning electron microscope image of the material;
FIG. 3 shows Ag modified In obtained In example 1 2 O 3 XRD pattern of the material;
FIG. 4 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic reduction of carbon dioxide in 5h 4 A time relationship graph of (a);
FIG. 5 shows Ag modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 6 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic reduction of carbon dioxide in 5h 4 A time relationship graph of (a);
FIG. 7 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 8 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 9 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 10 shows Ag-modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 11 shows Ag modified In obtained In example 1 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 12 shows Ag-modified In obtained In example 1 2 O 3 The material can generate CO and CH by photocatalytic carbon dioxide reduction in 5 cycles 4 A time relationship graph of (a);
FIG. 13 shows In obtained In comparative example 2 O 3 A scanning electron microscope image of the material;
FIG. 14 shows In obtained In comparative example 2 O 3 XRD pattern of the material;
FIG. 15 shows bulk In of comparative example 2 O 3 CO and CH generated by material photocatalytic carbon dioxide reduction in 5h 4 A time relationship graph of (a);
FIG. 16 shows bulk In of comparative example 2 O 3 The material can be used for photocatalytic carbon dioxide reduction to generate CO and CH within 5 cycles 4 Time-related graph of (2).
Detailed Description
As is known in the art, photocatalytic CO is currently available 2 The reduction still faces the problem of harsh reaction conditions of high temperature and high pressure. In order to solve the problems, the invention develops a method for preparing Ag modified In by using MOF as a template 2 O 3 . The absorption of light by the semiconductor generates electron-hole pairs. Reacting CO at normal pressure and temperature 2 Can be converted into carbon monoxide and methane to more quickly and effectively carry out photocatalysis on CO 2 And (4) carrying out reduction reaction.
The invention provides Ag modified In 2 O 3 A method for preparing a material, the method comprising synthesizing a precursor MIL-68 (In) by an indium salt and an organic ligand under solvothermal reaction conditions; then the MIL-68 (In) is converted into In by adopting a high-temperature calcination mode 2 O 3 (ii) a Then making said In pass through cation exchange method 2 O 3 Synthesizing to obtain Ag modified In 2 O 3 A material.
The method specifically comprises the following steps: (1) Weighing 1-15 parts of indium salt, dissolving in 10-60 parts of organic solvent, and stirring for 10-60 min; adding 1-15 parts of organic ligand, and continuously stirring for 1-4h to obtain a mixed solution; transferring the mixed solution into a hydrothermal kettle, setting the temperature to be 100-180 ℃, reacting for 1-7 h, and centrifuging and collecting to obtain a precursor MIL-68 (In); (2) Weighing 1-15 parts of MIL-68 (In), placing In a muffle furnace, calcining at 100-600 ℃ for 1-6 h to obtain In 2 O 3 (ii) a (3) Weighing 1-15 parts of silver salt, dissolving in 10-50 parts of solution, and performing ultrasonic treatment for 5-30 min; then adding 1 to 15 parts of the In 2 O 3 Mixing and stirring for 1-6 h, and centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
Preferably, in the step (1), the indium salt is stirred in the organic solvent for 10min to 50min; adding the organic ligand and stirring for 1-3.5 h; the temperature of the solvothermal reaction is 100-170 ℃; the reaction time is 2h-7h.
Preferably, in the step (2), the calcination temperature is 200 ℃ to 600 ℃; the calcination time is 1h-5h.
More specifically, the embodiment is a method for preparing CO for photocatalysis by a template method 2 Reduced Ag modified In 2 O 3 The preparation method of the material comprises the following steps:
(1) Weighing 0.1-1.0g of indium salt, dissolving in 10-30ml of organic solvent, and stirring for 10-25min; then adding 0.1-0.5g of organic ligand, and continuously stirring for 1-2.5h to obtain a mixed solution; transferring the mixed solution into a hydrothermal kettle, setting the temperature to be 100-150 ℃, reacting for 2-4.5h, and performing centrifugal collection to obtain a precursor MIL-68 (In);
(2) 0.1-0.5g of MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 1-4h at the temperature of 300-550 ℃ to obtain In 2 O 3 ；
(3) Weighing 0.01-0.1g of silver salt, dissolving in 15-30ml of solution, and performing ultrasonic treatment for 10-20min; then 0.1-0.5g of In is added 2 O 3 In (b) is 2 O 3 Mixing and stirring for 2-4.5h, and centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
The present invention will be described in detail with reference to the following embodiments.
Example 1
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium chloride is weighed and dissolved in 10ml of ethanol, stirred for 10min, after dissolution, 0.2g of diamino terephthalic acid is added, and stirring is continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the precursor MIL-68 (In) is obtained after centrifugal collection.
Then 0.1g of the synthesized MIL-68 (In) was weighed out and calcined In a muffle furnace at 400 ℃ for 2h. To obtain dried In as pale yellow powder 2 O 3 In a scanning electron microscope as shown in FIG. 1, the precursor has a rod-like structure.
Finally, 0.02g of silver nitrate is weighed and dissolved in 20ml of water solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 2h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
Ag modified In obtained In this example 2 O 3 A scanning electron microscope image of the material is shown in fig. 2; the XRD pattern is shown in FIG. 3.
In modified with rod-shaped Ag obtained In this example 2 O 3 Material, photocatalytic CO 2 FIG. 4 shows the reduction performance with time, and FIG. 4 shows that In is modified by rod-like Ag 2 O 3 The material is irradiated by xenon lamp for 4h, the generation amount of carbon monoxide (CO) is 14.4 μm/g/h, and methane (CH) 4 ) The amount of the produced (B) was 30.2. Mu.m/g/h.
Example 2
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate is weighed and dissolved in 10ml of ethanol, the mixture is stirred for 10min, 0.2g of terephthalic acid is added after the indium nitrate is dissolved, and the stirring is continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the precursor MIL-68 (In) is obtained after centrifugal collection.
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2h at 400 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver nitrate is weighed and dissolved in 20ml of water solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 2h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with rod-shaped Ag obtained In this example 2 O 3 Material, photocatalytic CO 2 FIG. 5 shows the reduction performance with time, and FIG. 5 shows that In is modified by rod-like Ag 2 O 3 The generation amount of CO is 14.5 mu m/g/h and CH is 4h under the irradiation of a xenon lamp 4 The amount of production of (b) was 30.3. Mu.m/g/h.
Example 3
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2 hours at the temperature of 400 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver nitrate is weighed and dissolved in 20ml of water solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 2h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with Ag In rod form obtained In this example 2 O 3 Material, photocatalytic CO 2 FIG. 6 shows the reduction performance with time, from which it can be seen that In is modified with rod-like Ag 2 O 3 The generation amount of CO is 14.8 mu m/g/h and CH is 4h under the irradiation of a xenon lamp 4 The amount of production of (b) was 30.5. Mu.m/g/h.
Example 4
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2 hours at 500 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver nitrate is weighed and dissolved in 20ml of water solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 2h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with rod-shaped Ag obtained In this example 2 O 3 Photo-catalytic CO 2 FIG. 7 is a graph showing the reduction performance with time, from which it can be seen that In is modified with rod-like Ag 2 O 3 The generation amount of CO is 14.9 mu m/g/h and CH is 4h under the irradiation of a xenon lamp 4 The amount of production of (b) was 30.6. Mu.m/g/h.
Example 5
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2 hours at 500 ℃ to obtain In 2 O 3 。
Finally, measure 002g of silver chloride was dissolved in 20ml of the aqueous solution and sonicated for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 4h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with Ag In rod form obtained In this example 2 O 3 Photo-catalytic CO 2 FIG. 8 shows the reduction performance with time, from which In modified by rod-like Ag 2 O 3 The generation amount of CO is 4h under the irradiation of a xenon lamp, the generation amount is 13.8 mu m/g/h, and the CH content is 4 The amount of the produced (B) was 28.6. Mu.m/g/h.
Example 6
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2h at 500 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver chloride is weighed and dissolved in 20ml of methanol solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 4h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with rod-shaped Ag obtained In this example 2 O 3 Photo-catalytic CO 2 FIG. 9 is a graph showing the reduction performance with time, from which it can be seen that In is modified with rod-like Ag 2 O 3 The CO generation amount is 13.4 mu m/g/h under the irradiation of a xenon lamp, and the CH is 4 The amount of production of (b) was 29.2. Mu.m/g/h.
Example 7
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2 hours at 500 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver powder is weighed and dissolved in 20ml of water solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 4h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with rod-shaped Ag obtained In this example 2 O 3 Photo-catalytic CO 2 FIG. 10 is a graph showing the reduction performance with time, from which it can be seen that In is modified with rod-like Ag 2 O 3 The CO generation amount is 13.4 mu m/g/h under the irradiation of a xenon lamp, and the CH is 4 The amount of production of (b) was 29.7. Mu.m/g/h.
Example 8
This example provides an In modified with Ag 2 O 3 The preparation method of the material comprises the following steps:
0.3g of indium nitrate was weighed and dissolved in 10ml of N, N-dimethylformamide, and stirred for 10min, after dissolution, 0.2g of terephthalic acid was added, and stirring was continued for 1.5h. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample is collected by centrifugation and dried at 60 ℃ to obtain a precursor MIL-68 (In).
0.1g of synthesized MIL-68 (In) is weighed and placed In a muffle furnace to be calcined for 2h at 500 ℃ to obtain In 2 O 3 。
Finally, 0.02g of silver nitrate is weighed and dissolved in 20ml of methanol solution, and ultrasonic treatment is carried out for 10min. Then 0.1g of In was added 2 O 3 Stirring the mixture for 4h, and finally centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
In modified with rod-shaped Ag obtained In this example 2 O 3 Photo-catalytic CO 2 The reduction performance versus time diagram is shown in FIG. 11, from whichTo show that the rod-shaped Ag modifies In 2 O 3 The CO generation amount is 15.4 mu m/g/h under the irradiation of a xenon lamp, and the CH content is 4 The amount of production of (b) was 31.2. Mu.m/g/h. And as shown in fig. 12, maintains better stability over 5 cycles.
Comparative example
Comparative example provides a bulk In 2 O 3 The preparation method of the material comprises the following steps:
weighing 0.3g of indium nitrate, dissolving the indium nitrate in 40ml of water solution, stirring the solution for 10min, adding 0.60g of urea after the indium nitrate is dissolved, and continuously stirring the solution for 30min. And transferring the mixed solution into a hydrothermal kettle, setting the temperature at 120 ℃, and reacting for 3h. Then, the sample was collected by centrifugation and dried at 60 ℃. 0.1g of the synthesized sample is weighed and placed In a muffle furnace to be calcined for 2 hours at 500 ℃ to obtain block In 2 O 3 A material.
Bulk In obtained In this example 2 O 3 A scanning electron microscope image of the material is shown in fig. 13; the XRD pattern is shown in fig. 14.
Bulk In obtained In this example 2 O 3 Materials, photocatalytic CO 2 The reduction performance is plotted against time In FIG. 15, from which it can be seen that bulk In 2 O 3 The material is irradiated under a xenon lamp for 4h, the generation amount of CO is 7.7 mu m/g/h, and CH 4 The amount of the produced (B) was 8.5. Mu.m/g/h. And as shown in fig. 16, poor stability was maintained for 5 cycles.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and the scope of the present disclosure should be defined only by the appended claims.

Claims (10)

1. Ag modified In 2 O 3 A method of preparing a material, the method comprising contacting the material with an indium salt and an organic ligand under solvothermal reaction conditionsSynthesizing a precursor MIL-68 (In); then the MIL-68 (In) is converted into In by adopting a high-temperature calcination mode 2 O 3 (ii) a Then making said In pass through cation exchange method 2 O 3 Synthesizing to obtain Ag modified In 2 O 3 A material.
2. Ag modified In 2 O 3 The preparation method of the material is characterized by comprising the following steps:
(1) Weighing 1-15 parts of indium salt, dissolving in 10-60 parts of organic solvent, and stirring for 10-60 min; adding 1-15 parts of organic ligand, and continuously stirring for 1-4h to obtain a mixed solution; transferring the mixed solution into a hydrothermal kettle, setting the temperature to be 100-180 ℃, reacting for 1-7 h, and performing centrifugal collection to obtain a precursor MIL-68 (In);
(2) Weighing 1-15 parts of MIL-68 (In), placing In a muffle furnace, calcining at 100-600 ℃ for 1-6 h to obtain In 2 O 3 ；
(3) Weighing 1-15 parts of silver salt, dissolving in 10-50 parts of solution, and performing ultrasonic treatment for 5-30 min; then adding 1 to 15 parts of the In 2 O 3 Mixing and stirring for 1-6 h, and centrifuging and collecting to obtain Ag modified In 2 O 3 A material.
3. Ag-modified In according to claim 2 2 O 3 The preparation method of the material is characterized in that in the step (1), the addition amount of the indium salt is 1-13 parts; the adding amount of the organic solvent is 10 to 45 portions; the adding amount of the organic ligand is 1 to 10 parts.
4. Ag-modified In according to claim 2 2 O 3 The preparation method of the material is characterized in that in the step (1), the indium salt is one or more of indium nitrate, indium chloride, indium antimonide and indium selenide; the organic solvent is one or more of ethanol, methanol, isopropanol, N-dimethyl amide or acetone; the organic ligand is nitroterephthalic acid, tetrafluoroterephthalic acid, terephthalic acid orOne or more of diamino terephthalic acid.
5. Ag-modified In according to claim 2 2 O 3 The preparation method of the material is characterized In that In the step (2), the MIL-68 (In) is added In an amount of 5-13 parts.
6. Ag-modified In according to claim 2 2 O 3 The method for preparing a material is characterized in that, in the step (3), the silver salt is silver nitrate, silver chloride, silver acetate or silver powder, and the solution is an ethanol solution, a methanol solution, an aqueous solution, an acetone solution, an ethylene glycol solution or an isopropanol solution.
7. Ag-modified In according to claim 6 2 O 3 The preparation method of the material is characterized in that the adding amount of the silver salt is 1 to 12 parts, and the using amount of the solution is 10 to 45 parts; the ultrasonic treatment time is 10-30 min.
8. Ag-modified In according to claim 2 2 O 3 A method for producing a material, characterized In that, in the step (3), the In 2 O 3 The adding amount of (1) is 5-13 parts, and the mixing and stirring time is 2-6 h.
9. Ag modified In 2 O 3 A material characterized In that Ag-modified In of any one of claims 1 to 8 2 O 3 Ag modified In prepared by material preparation method 2 O 3 A material.
10. The Ag-modified In of claim 9 2 O 3 Material in photocatalysis of CO 2 Application in reduction reaction.
CN202210891169.5A 2022-07-27 2022-07-27 Ag modified In 2 O 3 Material, preparation method and application thereof Pending CN115228461A (en)

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US20180355486A1 (en) * 2015-11-27 2018-12-13 Solvay Specialty Polymers Italy S.P.A. Multilayer composition and process of making
US20210322957A1 (en) * 2018-09-06 2021-10-21 Total Se Noble metal promoted supported indium oxide catalyst for the hydrogenation of co2 to methanol and process using said catalyst
CN113670990A (en) * 2021-08-27 2021-11-19 河南理工大学 Ag modified In2O3Composite material and preparation method thereof, gas sensor and application thereof

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US20140235736A1 (en) * 2011-10-24 2014-08-21 Sogang University Research Foundation Apparatus and method for reducing carbon dioxide using solar light
US20180355486A1 (en) * 2015-11-27 2018-12-13 Solvay Specialty Polymers Italy S.P.A. Multilayer composition and process of making
US20210322957A1 (en) * 2018-09-06 2021-10-21 Total Se Noble metal promoted supported indium oxide catalyst for the hydrogenation of co2 to methanol and process using said catalyst
CN113670990A (en) * 2021-08-27 2021-11-19 河南理工大学 Ag modified In2O3Composite material and preparation method thereof, gas sensor and application thereof

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