CN-122006654-A - Preparation method of magnetic hydroxyapatite material and application of material

Abstract

The invention discloses a preparation method of a magnetic hydroxyapatite material and application of the material in the technical field of environmental treatment materials, which adopts a hydrothermal method with simple operation, and adopts a method of dissolving calcium nitrate tetrahydrate in deionized water at normal temperature to serve as a calcium source, dissolving diammonium hydrogen phosphate in water to serve as a phosphorus source, mixing and stirring the two solutions, adding ferroferric oxide nano particles, regulating pH by ammonia water, stirring for reaction, heating for a period of time in an oven, cooling to room temperature, washing and freeze-drying precipitate, and obtaining the magnetic hydroxyapatite material. The magnetic hydroxyapatite can be used for adsorbing microplastic in water. The material has the advantages of large adsorption capacity, high removal efficiency and easy recovery.

Inventors

• ZHU PEIZHI
• ZHANG JIAJIA
• TANG JINGYI
• LIU ZHICHENG

Assignees

• 扬州大学

Dates

Publication Date

20260512

Application Date

20260215

Claims (7)

1. 1. The preparation method of the magnetic hydroxyapatite material is characterized by comprising the following steps of: S1, preparing a calcium source solution and a phosphorus source solution, namely dissolving calcium nitrate tetrahydrate into water to prepare a calcium source solution with the calcium ion concentration of 1.5-2.0mol/L, and dissolving diammonium phosphate into water to prepare a phosphorus source solution with the phosphorus ion concentration of 0.3-0.8 mol/L; S2, mixing and reacting, namely mixing and stirring a calcium source solution and a phosphorus source solution according to the volume ratio of 1:2, adding ferroferric oxide nano particles, regulating the pH value to 7-10 by using ammonia water, and stirring for 10+/-5 min, wherein the adding amount of ferroferric oxide in the mixed solution is 9-10g/L; S3, hydrothermal synthesis and post-treatment, namely transferring the mixed solution into a reaction kettle, heating the mixed solution in an oven for 24+/-6 hours, cooling, and washing and freeze-drying the precipitate to obtain the magnetic hydroxyapatite powder.
2. 2. The method for preparing a magnetic hydroxyapatite material according to claim 1, wherein in step S2, stirring is performed for 10min, and in step S3, heating is performed in an oven for 24 hours.
3. 3. The method of preparing a magnetic hydroxyapatite according to claim 1 wherein in step S3, the precipitate is washed 3 times with ethanol and water, respectively.
4. 4. The method of preparing a magnetic hydroxyapatite according to claim 1 wherein in step S3, the lyophilization is performed in a refrigerator at-45 ℃ for 24 hours.
5. 5. The method of claim 1, wherein the magnetic hydroxyapatite is used for adsorbing microplastic in water.
6. 6. The method according to claim 5, wherein the magnetic hydroxyapatite is added to a water body containing microplastic during adsorption, and is subjected to magnetic separation after shaking for 1-3 hours.
7. 7. The method of claim 6, wherein the micro plastic comprises particles of polystyrene, polyethylene or polyvinyl chloride, and the particle size is 1-100 μm.

Description

Preparation method of magnetic hydroxyapatite material and application of material Technical Field The invention relates to the technical field of environmental treatment materials, in particular to a preparation method of a magnetic hydroxyapatite material and application of the magnetic hydroxyapatite material in water body micro-plastic adsorption. Background In recent years, microplastic has become a global environmental pollution problem due to its smile in size, wide distribution, difficulty in explanation, and the like. Microplastic is continuously accumulated in nature mainly through mechanical degradation, photodegradation, chemical degradation and other modes, and the main sources of the microplastic include degradation of plastic products, textile wear, personal care products, wastewater discharge and the like. The micro plastic has strong adsorption capacity, can carry heavy metals, persistent organic pollutants, antibiotics and other pollutants, and causes double pollution to water environment and organisms. These contaminants are easily enriched into the human body through the food chain, possibly causing endocrine disruption, cytotoxicity and even genotoxicity problems. At present, the problems of removing the microplastic mainly comprise filtration, coagulation, photocatalysis, bioremediation, adsorption and the like. Among them, the adsorption technology has received extensive attention in terms of its advantages of simple operation, low cost, high efficiency, etc. Many adsorbent materials including biochar, metal-based materials, chitosan, natural minerals and the like have been developed at present, but there are still a few technical bottlenecks that the preparation process of the adsorbent is complex, the adsorption amount is small, the adsorption amount is not easy to separate and the like. The Chinese patent database discloses preparation and application of a functionalized magnetic material for enhancing adsorption of micro plastics in water, the publication number of the functionalized magnetic material is CN116139840A, the publication date is 20230523, and the method adopts polyethylene glycol to modify the surface of magnetic ferroferric oxide to form a hydroxylated magnetic ferric oxide nano material, and the functionalized magnetic material has the characteristics of large specific surface area and more adsorption active sites, and simultaneously has magnetism and is convenient to recycle. The invention uses surface hydroxylation ferroferric oxide as an adsorbent for removing polyethylene microplastic in water, and the result shows that the hydroxylation adsorption material can effectively remove polyethylene microplastic in water in a short time, compared with nano ferric oxide without surface modification, the adsorption rate of polyethylene is improved by 54 percent, and the invention verifies that the surface functionalization can improve the adsorption rate of the ferroferric oxide to polyethylene, and has wide application prospect in the aspect of treating the pollution of the water microplastic. However, the adsorption effect on the microplastic is single, which only shows that the adsorption effect on one microplastic of polyethylene is achieved, and certain requirements on the pH of the adsorption environment are met. The Chinese patent database also discloses a preparation method and application of the water micro-nano plastic adsorbent, wherein the publication number is CN116747841A, the publication date is 2023, 9 and 15, cationic groups are introduced to the surface of the core-shell type magnetic nano particles, and long-chain alkyl is connected to enhance agglomeration with electronegative nano micro-plastics and realize magnetic separation, but the preparation process is complex, the cost is high, organic reagents such as halogenated alkane and the like are needed, and analysis or recovery is realized in part under the severe condition of strong acidity. The Chinese patent database also discloses a biomass modified polyurethane foam, a preparation method thereof and application thereof in micro-nano plastic adsorption, wherein the publication number is CN119735785A, the publication date is 2025, 4 and 1, lignin and/or tannic acid are dissolved and mixed with polyurethane foam prepolymer, stirred and foamed, and the obtained mixture is washed and dried after being molded and cured to obtain the biomass modified polyurethane foam, and the prepared biomass modified polyurethane foam has a strong adsorption effect on nano plastic with the diameter of about 70-80 nm and has a strong regeneration capacity after being repeatedly utilized by a certain desorption method. However, the preparation process depends on DMF solvent, the preparation process is not environment-friendly, and polyurethane foam is easy to age and crack in water, so that the risk of secondary microplastic release exists. A method (Processthecontionuousmagneticremovalofmicroplasticspresentinaqueousmat