Preparation method of bar-shaped lanthanum hydroxide nanocrystal

Abstract

The invention provides a preparation method of a bar-shaped lanthanum hydroxide nanocrystal. The method comprises the following steps of: adding nona-lanthanum sulfate and ethylenediamine tetraacetic acid into deionized water respectively to obtain a solution B; adjusting the pH of the solution B to 8.0-12.0 with an ammonia water solution to obtain a precursor solution C; pouring the precursor solution C into a four-neck round-bottom flask, putting the four-neck round-bottom flask into a microwave-ultraviolet ray-ultrasonic wave three-in-one synthesis reaction instrument, selecting a microwave heating-ultraviolet irradiation combined reaction in a temperature-time mode, and naturally cooling to the room temperature after the reaction; and centrifugally collecting a product, washing repeatedly with deionized water and absolute ethyl alcohol respectively, and drying to obtain a final product, i.e., bar-shaped lanthanum hydroxide nanocrystal. A simple microwave-ultraviolet ray synthesis method preparation process is adopted, so that the method has the advantages of short reaction time period, low energy consumption, low cost, convenience in operating, one-time completion of a reaction in a liquid phase, and no need of subsequent treatment. La(OH3) particles prepared with the method have bar-shaped structures, are small in size, have high dispersity, and can be applied in the catalysis field and the optics field.

Description

technical field [0001] The invention relates to a preparation method of lanthanum hydroxide, in particular to a preparation method of rod-shaped lanthanum hydroxide nanocrystals. Background technique [0002] Lanthanum Hydroxide La(OH) 3 With excellent optical, electrical, and magnetic properties, it has been widely used as catalysts, adsorbents, fluorescent agents, time-resolved fluorescence (TRF) biolabels, and up-conversion luminescent materials. Nanostructured materials exhibit many properties superior to their bulk counterparts due to quantum size effects. Nanostructured lanthanum hydroxide has a relatively large specific surface area, which can fully contact with the reaction materials and greatly improve its catalytic activity. [0003] At present, the methods for preparing lanthanum hydroxide mainly include solvothermal method [Hou B, Xu Y, Wu D, et al.Synthesis and characterization of ultralong lanthanum hydroxide[J].J Mater Sci,2007(42):1397-1400.] , it is easy ...

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Problems solved by technology

[0003] At present, the methods for preparing lanthanum hydroxide mainly include solvothermal method [Hou B, Xu Y, Wu D, et al.Synthesis and characterization of ultralong lanthanum hydroxide[J].J Mater Sci,2007(42):1397-1400.] , it is easy to obtain pure phase nanomaterials, but the dispersion of the product is not good; the traditional hydrothermal method [Ma X, Zhang H, Ji Y, et al.Synthesis of ultrafine lanthanum hydroxidenanorods by a simple hydrothermal process[J].Mater Lett, 2004(58): 1180-1182.] needs to be carried out in the reactor at high temperature and high pressure, requiring strict experimental conditions and relatively long reaction time; precipitation method [Zhou Yang, Chen Shuguang, etc. Simple precipitation method to prepare lanthanum hydroxide nano Rod and its structural characterization[J].Journal of Changsha University of Science and Technology.2009.6(4):8589] The specific surface area of ​​the prepared sample is small, and the product uniformity is not good

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