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Method for preparing hollow UO2 nanosphere through liquid crystal radiation

A nanosphere and hollow technology, which is applied in the field of preparation of uranium oxide nanomaterials, can solve the problems of difficulty in adjusting the cavity size, irregular shape of nanospheres, poor rigidity of bubble templates, etc., and achieves the effect of regular shape.

Inactive Publication Date: 2016-12-14
PEKING UNIV
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Problems solved by technology

This method is simple and does not introduce impurities, but due to the poor rigidity of the bubble template, the shape of the obtained nanospheres is irregular, and the size of the cavity is difficult to control

Method used

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  • Method for preparing hollow UO2 nanosphere through liquid crystal radiation
  • Method for preparing hollow UO2 nanosphere through liquid crystal radiation
  • Method for preparing hollow UO2 nanosphere through liquid crystal radiation

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Embodiment Construction

[0032] 1. Experimental method

[0033] 1. Experimental reagents

[0034] UO 2 (NO 3 ) 2 ·6H 2 O, GR, Chemapol, Prague Czechoslovakia. NH 4 HCO 3 、Na 2 CO 3 , ammonium formate (HCOONH 4 ) were analytically pure and used directly. The experimental water was ultrapure water.

[0035] 2. Synthesis of Ammonium Uranyl Tricarbonate

[0036] According to the reference [31] , the UO 2 (NO 3 ) 2 ·6H 2 O was heat-treated in a muffle furnace at 350 °C for 3 hours to obtain yellow uranium trioxide powder. In a water bath at 60°C, a certain amount of saturated NH 4 HCO 3 The solution was slowly added dropwise to the 3 In a round-bottomed flask, stir until the yellow solid is completely dissolved, filter while hot, and transfer the filtrate into a beaker to cool and stand for crystallization. The crystals were collected by suction filtration and washed with 3wt% NH 4 HCO 3 Washed and dried in vacuo to obtain uranyl carbonate amide (AUC). The elemental analysis results...

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Abstract

The invention discloses a method for preparing hollow UO2 nanospheres through liquid crystal radiation. According to the method, hollow UO2 nanospheres of which the diameter is 10-100 nm and the wall thickness is 5-45 nm can be prepared by using a hexagonal phase liquid crystal system consisting of a gamma radiation Triton X-100 / AUC solution; the hollow UO2 nanospheres consist of UO2 nanoparticles of which the particle size is 1-10 nm; the product can stably exist at 300 DEG C. The sizes of cavities and the wall thickness of the hollow UO2 nanospheres can be effectively regulated by regulating the dosage rate and the concentration of Triton X-100.

Description

technical field [0001] The invention relates to the preparation of uranium oxide nanomaterials, in particular to hollow UO 2 Preparation methods of nanospheres. Background technique [0002] Uranium oxides, such as UO 2 , U 3 o 8 , UO 3 , is an important nuclear fuel, but also a class of effective catalysts. e.g. U 3 o 8 Can be used to degrade chlorine-containing organic small molecule compounds [1] ; UO 2 can catalyze the oxidation of ethanol [2] ; UO 3 Can catalyze the production of furan from acetaldehyde [3] . In the past ten years, studies have shown that nanoscale uranium oxide has a very low sintering temperature [4] and high catalytic activity [5 , 6] . Therefore, the synthesis of uranium oxide nanomaterials with specific size and morphology has attracted extensive attention. Currently, like quasi-spherical UO 2 nanoparticles [6-9] , U 3 o 8 nanoflower [5] , U 3 o 8 Nano stave [6,10] , mesoporous U 3 o 8 particles [11] , U 3 o 8 nanotub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/025B82Y30/00
CPCC01G43/025C01P2004/03C01P2004/04C01P2004/34C01P2004/64
Inventor 陈庆德沈兴海王永明
Owner PEKING UNIV
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