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Preparation method and application of rare earth metal hydroxide or vanadate nano material

A technology of rare earth metal salts and rare earth metals, applied in the fields of rare earth metal compounds, chemical instruments and methods, vanadium compounds, etc., can solve the problems of phase regulation and structure control difficulties, and achieve stable product quality, simple process, and controllable structure strong effect

Inactive Publication Date: 2010-01-13
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some difficulties in the phase control and structure control of rare earth compound nanomaterials by the existing synthesis methods; in particular, there are few literature reports on the internal relationship between rare earth hydroxides and vanadate materials in the efficient design and synthesis, and through Ionic liquids as structure-directing agents to control the composition and morphology of rare earth compounds

Method used

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  • Preparation method and application of rare earth metal hydroxide or vanadate nano material
  • Preparation method and application of rare earth metal hydroxide or vanadate nano material
  • Preparation method and application of rare earth metal hydroxide or vanadate nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1: Preparation and structural characterization of lanthanum hydroxide nanoparticles

[0039] At room temperature, the La(NO 3 ) 3 Mix it with NaOH uniformly according to the molar ratio of 1:30, put it in a polytetrafluoroethylene or stainless steel liner hydrothermal reaction kettle, add deionized water to make La(NO 3 ) 3The concentration is 0.0001M, then add a mixture of ionic liquid 1-butyl-3-methylimidazole bromide and absolute ethanol with a volume ratio of 1:90, and stir for 10 to 30 minutes; ℃ for 1 to 2 hours, after the reaction is completed, cool to room temperature, wash with deionized water and absolute ethanol for 3 to 4 times to neutrality, and vacuum dry at 80 ℃ for 6 hours to obtain a white powder. The XRD spectrum of the sample prepared under the conditions of Example 1 is as follows: figure 1 Show: product is the lanthanum hydroxide pure phase of hexagonal phase; SEM scanning electron microscope ( figure 2 ) shows that the product is a na...

Embodiment 2

[0041] Example 2: Preparation and structural characterization of lanthanum hydroxide nanorods

[0042] At room temperature, the LaCl 3 Mix evenly with NaOH at a molar ratio of 1:30, place in a polytetrafluoroethylene or stainless steel liner hydrothermal reactor, add deionized water to make LaCl 3 The concentration is 0.0015M, then add the mixed solution of ionic liquid 1-hexadecyl-3-methylimidazole bromide and absolute ethanol with a volume ratio of 1:10, and stir for 10 to 30 minutes; in a closed reaction kettle React at 170°C for 4-6 hours, cool to room temperature after the reaction is complete, wash the product with deionized water and absolute ethanol for 3-4 times to neutrality, and vacuum-dry at 80°C for 6 hours to obtain dry white powder. The product is identified as lanthanum hydroxide by X-ray powder diffraction, corresponding to the standard card (JCPDS card 36-1481), belonging to the hexagonal crystal system, and the space group is P63 / m; SEM scanning electron mi...

Embodiment 3

[0044] Example 3: Preparation and structural characterization of lanthanum hydroxide nanowires

[0045] At room temperature, the La 2 (SO 4 ) 3 Mix with NaOH uniformly according to the molar ratio of 1:30, place it in a polytetrafluoroethylene or stainless steel liner hydrothermal reaction kettle, add deionized water to make La 2 (SO 4 ) 3 The concentration is 0.002M, then add a mixture of ionic liquid 1-ethyl-3 imidazolium acetate and absolute ethanol with a volume ratio of 1:10, and stir for 10 to 30 minutes; React for 7 to 8 hours. After the reaction is completed, cool to room temperature, wash with deionized water and absolute ethanol for 3 to 4 times until neutral, and vacuum dry at 80° C. for 6 hours to obtain a white powder. In order to compare the positive effect of ionic liquids in hydrothermal synthesis, samples were prepared without adding ionic liquid 1-ethyl-3-methyl imidazolium acetate and other experimental conditions were the same. After comparing the X-r...

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Abstract

The invention provides a controllable preparation method and an application of rare earth metal hydroxide or vanadate nano material by using an ionic liquid assisted hydrothermal method. The preparation method comprises the following steps of taking rare earth metal salt, metavanadate and sodium hydroxide as raw materials, mixing evenly, adding deionized water to form precipitate, adding mixed solution of imidazolium ionic liquid and anhydrous ethyl alcohol, stirring for 10-30 min, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction for 1-8h under the temperature of 100-220 DEG C and obtaining rare earth metal hydroxide nano particles, nano rods or nano-wire materials. If the reaction time is prolonged to 16-148h, rare earth vanadate one-dimensional nano-wire and two-dimensional nanoflake materials can be prepared. The method provided by the invention can effectively adjust and control phases and features of rare earth metal hydroxide and vanadate nano materials, and has the advantages of mild reaction conditions, simple technique, low cost, high yield and the like, thus being hopeful to be widely applied in the fields such as luminescent devices, electrocatalytic components, permanent magnets, biological and medical industry and the like.

Description

【Technical field】: [0001] The invention belongs to the technical field of preparation of nanomaterials, in particular to a method and application for the controllable preparation of rare earth metal hydroxide or vanadate nanomaterials by ionic liquid-assisted hydrothermal method, and the rare earth metals can be selectively prepared by adjusting the experimental parameters of the reaction Zero-dimensional / one-dimensional / two-dimensional nanomaterials of hydroxide or vanadate. 【Background technique】: [0002] In rare earth metal hydroxides and vanadates, due to the unpaired structure of the inner 4f orbitals of rare earth atoms, they have the characteristics of high atomic magnetic moments and extremely rich electronic energy levels; the materials can be used as luminescent materials, electrocatalysts, permanent Magnetic materials, biomedical materials, and has potential application value. [0003] In order to give full play to the structural properties of such materials, th...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01G31/00C09K11/78C09K11/82
Inventor 郑文君孙嬿
Owner NANKAI UNIV
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