Mesoporous rare earth phosphate and preparation method thereof

Abstract

The invention discloses a mesoporous rare earth phosphate and a preparation method thereof, belonging to the field of porous nano-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 / strong phosphoric acid / concentrated nitric acid in the silicon dioxide pore channel, removing the nitric acid solvent through direct volatilization, thus precipitating the phosphate in the pore channel; further leading the rare earth phosphate 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. The mesoporous rare earth phosphate has the characteristics of high degree of order, adjustable pore diameter and mesoporous structure, large specific surface area, pore diameter, 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. The prepared mesoporous rare earth phosphate can be used for the embedding treatment of radioactive wastes.

Description

technical field [0001] The invention relates to a mesoporous rare earth phosphate and a preparation method thereof, belonging to the field of porous nanomaterials. 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 optical, electrical, 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, then the The prepared mesoporous rare earth materials will have the excellent properties of mesoporous (such as shape selectivity, adsorption, etc.) Functional materials such as drug delivery, porous photoluminescent devices, magnetic adsorption and separation materials have opened up new development paths. [0003] Si...

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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

At present, the research on the synthesis of mesoporous rare earth oxide materials by hard template method mainly focuses on the synthesis and structure characterization of mesoporous rare earth cerium oxide nanomaterials, but there is no report on the synthesis of other mesoporous rare earth compounds such as mesoporous rare earth phosphate

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