Mesoporous rare earth phosphate fluophor and preparation method thereof

Abstract

The invention discloses a mesoporous rare earth phosphate fluophor and a preparation method thereof, belonging to the field of multifunctional rare earth luminescent material. The method, which takes mesoporous silicon dioxide with an ordered pore channel structure as a hard template agent, comprises the steps of adding homogeneous solution of soluble rare-earth salts / rare earth fluophor material / strong phosphoric acid / concentrated nitric acid in the silicon dioxide pore channel, removing the nitric acid solvent through direct volatilization, thus precipitating the phosphate fluophor in the pore channel; further leading the rare earth phosphate fluophor to be cured in the mesoporous pore channel through high-temperature roasting treatment, removing the silicon dioxide hard template agent, thus obtaining the mesoporous rare earth phosphate fluophor. The mesoporous rare earth phosphate fluophor material has the characteristics of high degree of order, adjustable pore diameter and mesoporous structure, large specific surface area, pore diameter and pore volume and the like, with the specific surface area being 100-500m / g, the pore diameter being 3-8nm, and the pore volume being 0.15-1.5cm / g; and can be used as a novel absorbing and embedding material of medicaments.

Description

technical field [0001] The invention relates to a mesoporous rare earth phosphate phosphor and a preparation method thereof, belonging to the field of multifunctional rare earth luminescent materials. Background technique [0002] Mesoporous materials (with a pore size of 2-50 nm) are widely used in the fields of catalysts, adsorption and separation because of their regular and orderly pores, large specific surface area and pore volume. Rare earth elements have very important applications in the fields of optics, electricity, and magnetic devices due to their unique 4f electron sublayer structure. If we combine the two to synthesize mesoporous rare earth nanomaterials such as mesoporous rare earth phosphate, etc., then The prepared mesoporous rare earth materials will have the excellent properties of mesoporous (such as shape selectivity, adsorption, etc.) New functional materials such as drug delivery, porous photoluminescent devices, magnetic adsorption and separation mat...

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Problems solved by technology

[0005] It is worth noting that most of the reported rare earth mesoporous functional materials are prepared by grafting rare earth-containing organic small molecules on the surface of mesoporous silica molecular sieves, or by co-doping and post-synthesis. The internal pores of molecular sieves are often covered by these small organic molecules, resulting in reduced mesopore diameter and pore volume, which is not conducive to the entry of active molecules; at the same time, the toxicity of small organic molecules also limits the application of these rare earth materials in the field of biology

[0006] At present, there are relatively few reports on the synthesis of pure rare earth mesoporous compound materials, although this pure rare earth compound is likely to become a multifunctional material with controllable light, electricity and magnetism in the future: Mitsunori Yada [Y.Mitsunori, K.Hirohumi, I.Akira et al, Angew.Chem.Int.Ed.1999, 38, 3506.] used the anionic surfactant sodium dodecyl sulfate as a template and homogeneous precipitation to synthesize layered rare earth mesoporous oxides materials and characterized their magnetic properties, but the thermal stability of this layered rare earth mesoporous oxide is poor

Michael A.Morris [M.L.Daniel, M.R.Kevin, M.A.Morris J.Mater.Chem., 2002, 12, 1207.] improved their research method, using neutral templates to synthesize mesoporous rare earth oxides, at 450 ° C The structure of the sample can be maintained after lower calcination, but the order of the sample is poor

Domestic professor Wang Tongwen [T.Wang, L.Dai, Cloid and surfaces A: physicalchemical and Engineering, Aspects, 2002, 209, 65] used anionic surfactants to synthesize mesoporous rare earth yttrium oxide, but the stability of the mesoporous structure poor

[0007] The reason why there are few reports on the synthesis of mesoporous rare earth compounds is mainly related to the fact that mesoporous rare earth compounds are difficult to synthesize by directly using surfactants as templates. Because rare earth compounds are usually difficult to dissolve in water, the solubility product constant is very small ( Ksp~10-23 order of magnitude), its rare earth precursor has been separated out from the solution in the form of precipitation before the organic-inorganic synergy with the surfactant; in addition, in the process of roasting to remove the surfactant, due to The crystallization behavior of rare earth compounds also causes the collapse of mesoporous channels

Therefore, it is difficult to synthesize rare earth compound nanoporous materials with ordered structure and good thermal stability by using soft templates.

There is no report on the preparation of rare earth phosphate phosphors into porous materials

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