CN107626319B - Preparation method of flower-like lanthanum ferrite photocatalyst - Google Patents
Preparation method of flower-like lanthanum ferrite photocatalyst Download PDFInfo
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- CN107626319B CN107626319B CN201710930461.2A CN201710930461A CN107626319B CN 107626319 B CN107626319 B CN 107626319B CN 201710930461 A CN201710930461 A CN 201710930461A CN 107626319 B CN107626319 B CN 107626319B
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Abstract
The invention discloses a preparation method of a flower-shaped lanthanum ferrite photocatalyst, belonging to the technical field of preparation of novel photocatalytic materials. The technical scheme provided by the invention has the key points that: lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1, the solution is transferred into a hydrothermal reaction kettle to react for 8-12h at the temperature of 160-180 ℃, and then the solution is washed, dried and ground, and then the solution is heated to the temperature of 700-900 ℃ at the heating rate of 1-3 ℃/min under the nitrogen atmosphere to be calcined for 2-4h, so that the lanthanum ferrite photocatalyst which is assembled by the lanthanum ferrite with a layered structure, has a flower-shaped structure and has the particle size of 5-10 mu m is prepared. The preparation process of the invention has the advantages of simple and easily obtained raw materials participating in the reaction and simple and convenient operation.
Description
Technical Field
The invention belongs to the technical field of preparation of novel photocatalytic materials, and particularly relates to a preparation method of a flower-shaped lanthanum ferrite photocatalyst.
Background
With the development of industrialization process, the problem of environmental pollution is becoming more serious, and environmental protection and sustainable development become major problems facing human beings. The photocatalysis technology is to promote the oxidation-reduction reaction of pollutants on the surface of a catalyst by utilizing the irradiation of light sources such as sunlight and the like, and finally degrade the pollutants into environment-friendly micromolecular inorganic substances.
Lanthanum ferrite is a nontoxic and stable ABO3The perovskite semiconductor material (Eg =1.86-2.36 eV) has excellent physical and chemical properties, has certain application potential in the aspects of catalysis, gas sensitivity, electrochemistry, magnetic materials and the like, has the advantages of visible light absorption, easy magnetic separation and the like as a photocatalytic material, and is also paid attention to by people.
The performance of semiconductor photocatalytic materials is affected by many factors, of which morphology is an important influencing factor. The shapes of the materials are different, and the specific surface areas, the active surfaces and the like of the materials are different, so that the photocatalysis performances of the materials are different. At present, the main shapes of lanthanum ferrite reported in the literature are granular, and also the shapes of spherical, lamellar and yolk shell structures and the like are reported in some literatures.
Disclosure of Invention
The invention solves the technical problem of providing a preparation method of a flower-shaped lanthanum ferrite photocatalyst, which has cheap and easily obtained raw materials and is simple and convenient to operate.
The invention adopts the following technical scheme for solving the technical problems, and the preparation method of the flower-shaped lanthanum ferrite photocatalyst is characterized by comprising the following specific steps of: lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1, the solution is transferred into a hydrothermal reaction kettle to react for 8-12h at the temperature of 160-180 ℃, and then the solution is washed, dried and ground, and then the solution is heated to the temperature of 700-900 ℃ at the heating rate of 1-3 ℃/min under the nitrogen atmosphere to be calcined for 2-4h, so that the lanthanum ferrite photocatalyst which is assembled by the lanthanum ferrite with a layered structure, has a flower-shaped structure and has the particle size of 5-10 mu m is prepared.
The flower-shaped lanthanum ferrite prepared by the invention is a flower-shaped structure assembled by the lanthanum ferrite with a layered structure along a certain direction, and the particle size of the flower-shaped lanthanum ferrite is 5-10 mu m. The BET test structure shows that the prepared lanthanum ferrite belongs to a mesoporous structure, and the structure is favorable for full contact of pollutants and a catalyst in a photocatalytic degradation process on one hand, and can effectively prevent agglomeration among particles on the other hand, so that the photocatalytic performance of the lanthanum ferrite is remarkably improved. The preparation process of the invention has the advantages of simple and easily obtained raw materials participating in the reaction and simple and convenient operation.
Drawings
FIG. 1 is a scanning electron micrograph of a lanthanum ferrite photocatalyst prepared in example 3;
FIG. 2 is a diagram showing the pore size distribution of the lanthanum ferrite photocatalyst prepared in example 2;
FIG. 3 is a graph showing the photocatalytic performance of the lanthanum ferrite photocatalyst prepared in example 3.
Detailed Description
The present invention is described in further detail below with reference to examples, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples, and that all the technologies realized based on the above subject matter of the present invention belong to the scope of the present invention.
Example 1
Lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1 and stirred for 30 min, then the solution is transferred into a hydrothermal reaction kettle to react for 10 h at 160 ℃, washed, dried, ground, placed into a tubular furnace, heated to 700 ℃ at the heating rate of 1 ℃/min under the nitrogen atmosphere, and calcined for 2h to prepare the flower-shaped lanthanum ferrite photocatalyst.
Example 2
Lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1 and stirred for 30 min, then the solution is transferred into a hydrothermal reaction kettle to react for 12h at 170 ℃, washed, dried, ground and then placed into a tubular furnace to be heated to 800 ℃ at the heating rate of 3 ℃/min under the nitrogen atmosphere and calcined for 3 h to prepare the flower-shaped lanthanum ferrite photocatalyst.
Example 3
Lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1 and stirred for 30 min, then the solution is transferred into a hydrothermal reaction kettle to react for 8 h at 180 ℃, washed, dried, ground and then placed into a tubular furnace to be heated to 900 ℃ at the heating rate of 2 ℃/min under the nitrogen atmosphere and calcined for 4h to prepare the flower-shaped lanthanum ferrite photocatalyst.
The foregoing embodiments illustrate the principles, principal features and advantages of the invention, and it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made therein without departing from the scope of the principles of the invention.
Claims (2)
1. A preparation method of a flower-shaped lanthanum ferrite photocatalyst is characterized by comprising the following specific steps: lanthanum nitrate and ferric nitrate are added into an ethanol solution according to the molar ratio of 1:1, the solution is transferred into a hydrothermal reaction kettle to react for 8-12h at the temperature of 160-180 ℃, and then the solution is washed, dried and ground, and then the solution is heated to the temperature of 700-900 ℃ at the heating rate of 1-3 ℃/min under the nitrogen atmosphere to be calcined for 2-4h, so that the lanthanum ferrite photocatalyst which is assembled by the lanthanum ferrite with a layered structure, has a flower-shaped structure and has the particle size of 5-10 mu m is prepared.
2. The method for preparing the flower-like lanthanum ferrite photocatalyst according to claim 1, characterized in that: the lanthanum ferrite photocatalyst has a mesoporous structure.
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| CN201710930461.2A CN107626319B (en) | 2017-10-09 | 2017-10-09 | Preparation method of flower-like lanthanum ferrite photocatalyst |
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| CN107626319B true CN107626319B (en) | 2020-02-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109399726B (en) * | 2018-11-15 | 2020-10-16 | 沈阳理工大学 | Preparation method of iron lanthanum oxide molecular sieve type purification material |
| CN109355704B (en) * | 2018-12-11 | 2020-08-21 | 西南科技大学 | Gas-sensitive LaCoO3Method for preparing epitaxial film |
| CN110252415A (en) * | 2019-07-11 | 2019-09-20 | 佛山科学技术学院 | For eliminating the preparation method of the amino functional MOFs of indoor formaldehyde |
| CN113559882B (en) * | 2021-07-07 | 2022-05-10 | 哈尔滨学院 | Preparation method of sulfur/lanthanum ferrite nanocomposite |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102190483A (en) * | 2010-03-01 | 2011-09-21 | 中国科学院生态环境研究中心 | Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof |
| CN103553140A (en) * | 2013-10-14 | 2014-02-05 | 济南大学 | Method for preparing lanthanum ferrite nanodisk |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102190483A (en) * | 2010-03-01 | 2011-09-21 | 中国科学院生态环境研究中心 | Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof |
| CN103553140A (en) * | 2013-10-14 | 2014-02-05 | 济南大学 | Method for preparing lanthanum ferrite nanodisk |
Non-Patent Citations (1)
| Title |
|---|
| Photocatalytic degradation of organic dyes under visible light irradiation by floral-like LaFeO3 nanostructures comprised of nanosheet petals;Subramaniam Thirumalairajan等;《New J. Chem.》;20140829;第38卷;第5480-5490页 * |
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