Method of greenly preparing rare-earth potassium orthophosphate nano/micro crystal

Abstract

The invention belongs to the field of micro / nano material preparation technology and hydrothermal synthesis technology, and specifically relates to a green method for preparing rare earth orthophosphate nano / micro crystals. The specific steps are: use phosphorus pentoxide or phosphoric acid and rare earth metal oxides as precursors, use deionized water or absolute ethanol as solvent, place them in a container, and the molar ratio of phosphorus pentoxide or phosphoric acid and rare earth metal oxides 1 to 200, the amount of solvent added is 50-80% of the volume of the container; put the container containing the mixture in a temperature-controlled furnace, and increase the temperature at a rate of 8.5-11.5°C / min, according to the requirements of different characteristics of the product to be obtained, In the range of 100°C-250°C, keep at a certain temperature and heat at a constant temperature for 1-48 hours, take out the container, and naturally cool to room temperature; wash and centrifuge to obtain the desired product. The invention realizes that in a specific hydrothermal reaction system, the insoluble rare earth oxides and phosphorus pentoxide or phosphoric acid in the normal state are directly used as precursors, and through changes in temperature and time, the proportion of reactants and additives Addition can control the morphology and crystal form of the product.

Description

technical field [0001] The invention belongs to the field of micro / nano material preparation technology and hydrothermal synthesis technology, and specifically relates to a method for preparing rare earth orthophosphate nano / micro crystals. Background technique [0002] Rare earth elements are favored in phosphors because of their unique 4f-layer electronic structure and the excellent performance of excitation light in line spectrum or narrow band spectrum. At the same time, rare earth phosphates have broad application prospects in medicine, nuclear industry, electricity, laser, magnetism, and other fields. With the development of nanotechnology, the demand for nanoscale rare earth orthophosphate will increase. The preparation method of the rare earth orthophosphate of reported nanoscale mainly comprises solid-phase method and solution method: solid-phase method is usually with excessive phosphorus pentoxide or phosphoric acid, ammonium dihydrogen phosphate is phosphorus so...

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Problems solved by technology

[0003] Although the above-mentioned methods provide some approaches for synthesizing rare earth phosphate nanomaterials, there are still deficiencies, such as solid-phase reactions usually requiring high temperature, excessive phosphorus and complicated procedures to obtain nanoscale phosphates, although the solution method does not require high The reaction temperature, but the inevitable by-products, the adjustment of the acidity of the solution will result in higher production costs and complex processes, which is not conducive to environmental protection and rational use of resources

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