CN-120504344-B - Cobalt ferrite and preparation method and application thereof

Abstract

The invention provides cobalt ferrite and a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method comprises the steps of (1) mixing cobalt salt, ferric salt and water to obtain a mixed solution, and (2) mixing the mixed solution obtained in the step (1) with alkali liquor to perform a hydrothermal reaction to obtain cobalt ferrite, wherein the temperature of the hydrothermal reaction is 155-165 ℃. According to the invention, cobalt ferrite and ferric salt are used as raw materials, the cobalt ferrite is prepared through hydrothermal reaction, the temperature of the hydrothermal reaction is controlled, so that the obtained cobalt ferrite also contains ferroferric oxide, and the cobalt ferrite and the ferroferric oxide interact with each other, so that the prepared cobalt ferrite has a faster removal rate when being used for removing pollutants in a water body, and the degradation of the pollutants can be completed in a shorter time. The results of the examples show that when the cobalt ferrite prepared by the method is used for removing bisphenol A in water, the removal rate of the cobalt ferrite reaches approximately 100% after 5 min.

Inventors

• JI HAODONG
• LIU MINGYI

Assignees

• 北京大学深圳研究生院

Dates

Publication Date

20260505

Application Date

20250519

Claims (1)

1. 1. The application of cobalt ferrite in removing bisphenol A in water body is characterized in that water body to be treated is mixed with cobalt ferrite and oxidant for degradation to obtain purified water, the mass ratio of the cobalt ferrite to the water body to be treated is 0.3 g/1L, the concentration of the oxidant is 0.2mmol/L after the water body to be treated is mixed with the cobalt ferrite and the oxidant, the cobalt ferrite contains ferroferric oxide, the concentration of bisphenol A in the water body to be treated is 10mg/L, the pH value of the water body to be treated is 6.32, and the oxidant is peroxymonosulfate; The preparation method of the cobalt ferrite comprises the following steps: (1) Mixing cobalt salt, ferric salt and water to obtain a mixed solution; (2) Mixing the mixed solution obtained in the step (1) with alkali liquor, and performing hydrothermal reaction to obtain cobalt ferrite; the cobalt salt in the step (1) is Co (NO 3 ) 2 ·6H 2 O), the mass ratio of cobalt ions in the cobalt salt and iron ions in the iron salt in the step (1) is 1:2, the mass ratio of the cobalt salt and the water in the step (1) is 1.455g:60mL, the pH value of the mixed solution in the step (2) after being mixed with alkali liquor is 12, the hydrothermal reaction temperature in the step (2) is 160 ℃, and the hydrothermal reaction time is 12h.

Description

Cobalt ferrite and preparation method and application thereof Technical Field The invention belongs to the technical field of water treatment, and particularly relates to cobalt ferrite and a preparation method and application thereof. Background With the development of the pharmaceutical and washing industries, the production and use of medicines and personal care products (PPCPs) is rapidly increasing, so that the PPCPs remain in water bodies, and the residual PPCPs have potential adverse effects on human and animal health, so that the PPCPs in the water bodies are necessary to be removed. The methods for removing PPCPs from the water body currently applied mainly comprise a biological method, a physical method and a chemical method. The traditional biological treatment process has limited PPCPs removal effect, long treatment time, easy occurrence of deterioration conditions such as color change and smell change of wastewater, and the like, and is usually required to be combined with other methods to be applied to the removal of PPCPs in various wastewater. Physical treatment of PPCPs does not alter the chemical structure of the contaminants, and there is still a risk of migration and transformation after removal. Advanced oxidation techniques in chemical processes are considered a promising way to degrade contaminants, which require suitable external conditions to activate the oxidizing agent. Although the prior art has a method for removing pollutants in water by using a cobalt ferrite activated oxidant, the removal rate and the removal time of the cobalt ferrite in the prior art are slower when the cobalt ferrite is used for removing the pollutants in water. Disclosure of Invention The invention aims to provide cobalt ferrite and a preparation method and application thereof. The cobalt ferrite prepared by the preparation method provided by the invention has the advantages of high removal rate and short removal time when being used for removing pollutants in water. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a preparation method of cobalt ferrite, which comprises the following steps: (1) Mixing cobalt salt, ferric salt and water to obtain a mixed solution; (2) And (3) mixing the mixed solution obtained in the step (1) with alkali liquor, and performing a hydrothermal reaction to obtain cobalt ferrite, wherein the temperature of the hydrothermal reaction is 155-165 ℃. Preferably, the ratio of the mass of cobalt ions in the cobalt salt to the mass of iron ions in the iron salt in the step (1) is 1 (1.9-2.1). Preferably, in the step (1), the mass ratio of the cobalt salt to the water is (1.4-1.5) g/60 mL. Preferably, the pH value of the mixed solution obtained in the step (2) after the mixed solution is mixed with alkali liquor is 11-12. Preferably, the hydrothermal reaction time in the step (2) is 11-13 hours. The invention also provides cobalt ferrite prepared by the preparation method. The invention also provides application of the cobalt ferrite in removing medicines or personal care products in water. Preferably, the water body to be treated is mixed with cobalt ferrite and an oxidant for degradation to obtain purified water. Preferably, the ratio of the mass of the cobalt ferrite to the volume of the water body to be treated is (0.1-0.5) g to 1L. Preferably, after the water body to be treated is mixed with cobalt ferrite and an oxidant, the concentration of the oxidant is 0.1-0.3 mmol/L. The invention provides a preparation method of cobalt ferrite, which comprises the following steps of (1) mixing cobalt salt, ferric salt and water to obtain a mixed solution, and (2) mixing the mixed solution obtained in the step (1) with alkali liquor to perform a hydrothermal reaction to obtain the cobalt ferrite, wherein the temperature of the hydrothermal reaction is 155-165 ℃. According to the invention, cobalt ferrite and ferric salt are used as raw materials, the cobalt ferrite is prepared through hydrothermal reaction, the temperature of the hydrothermal reaction is controlled, so that the obtained cobalt ferrite also contains ferroferric oxide, and the cobalt ferrite and the ferroferric oxide interact with each other, so that the prepared cobalt ferrite has a faster removal rate when being used for removing pollutants in a water body, and the degradation of the pollutants can be completed in a shorter time. The results of the examples show that when the cobalt ferrite prepared by the method is used for removing bisphenol A in water, the removal rate of the cobalt ferrite reaches approximately 100% after 5 min. Drawings FIG. 1 is a mechanism diagram of degrading PPCPs in a water body by adopting cobalt ferrite; FIG. 2 is an SEM image of the cobalt ferrite prepared in example 1 at 500nm scale; FIG. 3 is an SEM image of the cobalt ferrite prepared in example 1 at a1 μm scale; FIG. 4 is an XRD pattern of cobalt ferrite prepared i