CN-121972168-A - Fe-Sr double hydroxide, preparation method thereof and application thereof in photocatalytic degradation of organic pollutants

Abstract

The invention belongs to the technical field of environmental pollution control and advanced oxidation, and particularly relates to Fe-Sr double hydroxide, a preparation method thereof and application thereof in photocatalytic degradation of organic pollutants. And dissolving a strontium source and an iron source in deionized water, regulating the pH value to be alkaline, performing hydrothermal reaction, cooling, centrifuging, washing and drying to obtain the Fe-Sr double hydroxide. Fe and Sr elements in the prepared material form a stable composite structure, and the material has good dispersibility and synergistic catalytic performance. Under the irradiation of visible light or ultraviolet light, the catalyst is used as a photo Fenton reaction catalyst to act with hydrogen peroxide in a synergistic way, and the methylene blue in the water body is efficiently catalyzed and degraded. Exhibits excellent photo-Fenton catalytic activity and degradation efficiency. The preparation method has the advantages of simple process, mild condition, easily obtained raw materials, good photoresponsive property, catalytic stability and reusability, and high practical application potential of degrading pollutants under near-neutral conditions.

Inventors

• LI WENJIE
• CHE YANDONG

Assignees

• 辽宁大学

Dates

Publication Date

20260505

Application Date

20260408

Claims (8)

1. 1. The preparation method of the Fe-Sr double hydroxide is characterized by comprising the following steps: Completely dissolving a strontium source and an iron source in deionized water, adding a NaOH solution, regulating the pH value to be alkaline to form a suspension, transferring the suspension into a hydrothermal reaction kettle, sealing, performing hydrothermal reaction, naturally cooling, centrifuging, washing until filtrate is neutral, and drying to obtain the Fe-Sr double hydroxide.
2. 2. The method for producing a Fe-Sr double hydroxide according to claim 1, wherein the strontium source and the iron source are strontium chloride and ferric trichloride, respectively.
3. 3. The method for preparing Fe-Sr double hydroxide according to claim 2, wherein the molar ratio of strontium chloride, ferric trichloride and NaOH is 1:2:8.
4. 4. The method for producing a Fe-Sr double hydroxide according to claim 1, characterized in that the hydrothermal reaction temperature is 120℃and the reaction time is 12 hours.
5. 5. The Fe-Sr double hydroxide produced by the production method as claimed in any one of claims 1 to 4.
6. 6. Use of the Fe-Sr double hydroxide according to claim 5 for degradation of organic dye contaminants by the photo-Fenton reaction.
7. 7. The use according to claim 6, wherein the organic dye contaminant is methylene blue.
8. 8. The use according to claim 7, characterized in that the method comprises adding Fe-Sr double hydroxide into methylene blue solution, adding hydrogen peroxide, and carrying out photo-Fenton degradation reaction under the condition of simulating sunlight illumination to catalyze and degrade methylene blue.

Description

Fe-Sr double hydroxide, preparation method thereof and application thereof in photocatalytic degradation of organic pollutants Technical Field The invention belongs to the technical field of environmental pollution control and advanced oxidation, and particularly relates to Fe-Sr double hydroxide, a preparation method thereof and application thereof in photocatalytic degradation of organic pollutants. Background With the rapid development of industries such as printing and dyeing, spinning, papermaking, chemical industry and the like, a large amount of industrial wastewater containing organic dyes is discharged into natural water bodies. Among them, methylene Blue (MB), which is a typical cationic dye, has the characteristics of stable chemical structure, poor biodegradability, phototoxicity, potential carcinogenicity, etc., and if discharged directly without effective treatment, it will pose serious threat to aquatic ecosystems and human health. Although the traditional advanced oxidation technology (such as classical Fenton reaction) can produce hydroxyl free radical (OH) with strong oxidability through a Fe 2+/H2O2 system to realize the degradation of organic pollutants, the problems of narrow pH application range (usually strong acidity is needed), easy loss of iron ions, difficult recovery of catalyst, low H 2O2 utilization rate and the like exist. In recent years, the photo Fenton technology promotes the rapid cyclic regeneration of Fe 3+/Fe2+ by introducing illumination conditions and accelerates the decomposition of H 2O2 to generate more active oxygen species, thereby remarkably improving the degradation efficiency and widening the pH application range. Heterogeneous photo-Fenton catalysts based on iron-based materials are receiving extensive attention because of their advantages of good stability, reusability, etc. However, a single iron-based material often has the disadvantages of narrow photoresponse range, high carrier recombination rate, and the like. Therefore, the novel iron-based composite catalytic material is developed, and the light absorption capacity, the photogenerated carrier separation efficiency and the Fenton activity are improved by introducing other metal elements to form a synergistic effect, so that the novel iron-based composite catalytic material has important research value and application prospect. Disclosure of Invention Aiming at the problems of complex preparation process, to-be-improved catalytic efficiency, limited pH application range and the like of a photo-Fenton catalyst in the prior art, the invention provides a preparation method of Fe-Sr double hydroxide and application thereof in degradation of organic dye pollutants such as Methylene Blue (MB) by photo-Fenton reaction. The prepared Fe-Sr double hydroxide has good light response performance and catalytic stability, can efficiently activate hydrogen peroxide under near neutral condition, and realizes rapid degradation of organic dye. In order to achieve the aim of the invention, the invention adopts the following technical scheme that the preparation method of the Fe-Sr double hydroxide comprises the following steps: Completely dissolving a strontium source and an iron source in deionized water, adding a NaOH solution, regulating the pH value to be alkaline to form a suspension, transferring the suspension into a hydrothermal reaction kettle, sealing, performing hydrothermal reaction, naturally cooling, centrifuging, washing until filtrate is neutral, and drying to obtain the Fe-Sr double hydroxide. In the preparation method of the Fe-Sr double hydroxide, the strontium source and the iron source are respectively strontium chloride and ferric trichloride. In the preparation method of the Fe-Sr double hydroxide, the molar ratio of strontium chloride to ferric trichloride to NaOH is 1:2:8. In the preparation method of the Fe-Sr double hydroxide, the hydrothermal reaction temperature is 120 ℃, and the reaction time is 12 hours. The Fe-Sr double hydroxide is prepared by the preparation method. The Fe-Sr double hydroxide is applied to degradation of organic dye pollutants by photo-Fenton reaction. For the above application, the organic dye contaminant is methylene blue. Under the illumination condition, the Fe-Sr double hydroxide is added into an aqueous solution containing Methylene Blue (MB) or other organic dyes, and a proper amount of hydrogen peroxide is added to start the photo-Fenton reaction. The high-efficiency and rapid degradation of organic dye pollutants is realized by the light-promoted Fe3+/Fe2+ circulation and the activation of H 2O2 by the active site on the surface of the material to generate a large amount of hydroxyl free radicals. Compared with the prior art, the invention has the following beneficial effects: 1. the preparation process is simple, the condition is mild, the coprecipitation and the low-temperature hydrothermal method are combined for one-step synthesis, the raw materials are chea