Magnetic composite hydroxyapatite nanoparticles as well as preparation method and application thereof

Abstract

The invention discloses magnetic composite hydroxyapatite nanoparticles. The magnetic composite hydroxyapatite nanoparticles are composed of Fe3O4 nanoparticles and hydroxyapatite nanoparticles, wherein the molar ratio of the Fe3O4 to the hydroxyapatite is (1-10): 1; the magnetic composite hydroxyapatite nanoparticles are spherical aggregate or agglomerate in which the Fe3O4 nanoparticles and the hydroxyapatite nanoparticles are distributed evenly and alternately. The preparation method of the magnetic composite hydroxyapatite nanoparticles is simple; the nanoparticles are capable of efficiently removing heavy metal ions in sewage, and in the later treatment period, quick magnetic separation can be realized; the nanoparticles have the adsorbing capacity of 440mg/g to lead ions, the adsorbing capacity of 238mg/g to cadmium ions, the adsorbing capacity of 139mg/g to zinc ions and the adsorbing capacity of 135mg/g to copper ions in the sewage; the magnetic composite hydroxyapatite nanoparticles have a rapid magnetic response characteristic, and are capable of realizing rapid solid-liquid separation with an external magnetic field, and the separation process is high in separation efficiency, and simple and efficient to operate; and besides, the nanoparticles are not residual in water and do not cause secondary pollution to the water and the environment.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a magnetic composite hydroxyapatite nanoparticle and a preparation method and application thereof. Background technique [0002] The development of modern economy and the needs of industrial production have stimulated the large-scale development of a large number of high-energy-consuming and high-pollution enterprises such as battery manufacturing, metal smelting, and mining. The discharged wastewater flows into rivers and rivers, penetrates into the groundwater, and seriously damages the ecological environment. Therefore, solving the problem of heavy metal pollution and protecting the ecological environment for human existence has become an urgent problem to be solved by countries all over the world. [0003] Hydroxyapatite is a common substance in industrial sewage treatment, and it is used for the removal of heavy metals in sewage. Natural hydroxyapatite is chea...

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Problems solved by technology

There are few reports on the combination of magnetic nanomaterials and hydroxyapatite. For example, CN 103541005A discloses a method for preparing magnetic hydroxyapatite whisker balls. Iron oxide ferromagnetic fluid is used as raw material, urea is used as pH regulator, and magnetic hydroxyapatite whisker balls are prepared under water bath conditions, which can be used in targeted drug carriers, bioengineering materials and other fields. However, the method used in the experimental process Nano-ferric oxide needs to be modified by double layers, which increases the complexity of the method to a certain extent, and the surface modifier added for modifying ferric oxide is generally difficult to remove, which also increases to a certain extent. production complexity

H.Yang, S.Masse, H.Zhang, C.Hélary, L.Li, T.Coradin, Surface reactivity of hydroxyapatite nanocoatings deposited on iron oxide magnetic spheres toward toxic metals, J.Colloid Inter.Sci.417(2014) 1-8. Reported Fe 3 O 4 Hydroxyapatite Composite microspheres are used for the removal of lead ions. During the synthesis of such composite particles, aspartic acid treatment is required for surface modification, and the synthesis process is complicated.

Liao, D.; Zheng, W.; Li, X.; Yang, Q.; Yue, X.; Guo, L.; Zeng, G. Removal of lead(II) from aqueous solutions using carbonate hydroxyapatite extracted from eggshell waste. J.Hazard.Mater.2010,177(1-3),126-130. Reported by Li Dengxiao using discarded egg shells to synthesize magnetic calcium hydroxyphosphate composites for the removal of lead ions, but the dispersion of this material is poor Limited removal of lead ions

CN102500333A proposes to prepare a kind of magnetic cationic surfactant modified chitosan / hydroxyapatite / zeolite composite with natural zeolite, hydroxyapatite, ferric oxide, chitosan and cationic surfactant as basic materials, It can be used as an adsorbent for magnetic organic-inorganic composite materials, and this adsorbent can be used to remove organic pollutants such as humic acid and Congo red and heavy metal pollutants such as copper ions in water. The pH value is required, and the pH value of the sewage needs to be adjusted to neutral (6.0-7.0) before treatment. The operability is poor, and the adsorption performance is not high (the adsorption capacity of humic acid and Congo red is 80mg / kg, copper The ion adsorption capacity is 27mg / kg), which limits its application in sewage treatment to a certain extent

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