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A multifunctional single-phase pyrochlore structure neodymium stannate nanosphere composite oxide material

A technology of pyrochlore structure and composite oxides, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, tin oxide, luminescent materials, etc., can solve the problem of no obvious photoluminescence, no photoluminescence, limitations Application and other issues, to achieve the effect of low cost, easy control, and uniform particle distribution

Inactive Publication Date: 2016-04-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, Wang Hao, Zhang Tingting, etc. used common hydrothermal synthesis methods to synthesize Nd with a single-phase pyrochlore structure using NaOH as a mineralizer without adding any complexing agent or surfactant. 2 sn 2 o 7 , but the material does not have photoluminescent properties, which limits its application in the field of photoluminescence
Nd with single-phase pyrochlore structure synthesized by Yao Kuihong, Yu Guixia, etc. by ordinary hydrothermal method 2 sn 2 o 7 The material does not exhibit significant photoluminescence in the visible region, thus limiting its applications
However, ChunjieWang et al. synthesized a kind of Nd by hydrothermal method and adding polyethylene glycol (PEG) as a surfactant. 2 Zr 2 o 7 Composite oxide materials, but the synthesized material needs to be calcined at a high temperature of 1100°C to have a pyrochlore structure, thus wasting a lot of energy

Method used

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  • A multifunctional single-phase pyrochlore structure neodymium stannate nanosphere composite oxide material
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  • A multifunctional single-phase pyrochlore structure neodymium stannate nanosphere composite oxide material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 0.005mol of neodymium nitrate and tin tetrachloride respectively, dissolve in deionized water and stir at room temperature until completely dissolved; weigh 20g of PEG2000 and dissolve in deionized water, slowly pour into the mixed salt solution, and stir for 1h .

[0026] (2) Slowly add sodium hydroxide solution dropwise to the solution obtained in step (1) under stirring, so that the pH value of the solution is finally kept at 10 to obtain a suspension.

[0027] (3) The suspension obtained in step (2) was aged at 60° C. and stirred for 24 hours to obtain a reaction mixture.

[0028] (4) Transfer the reaction mixture obtained in step (3) to the reactor, seal it, and heat it at 200°C for 18 hours to carry out the hydrothermal reaction. After the reactor is naturally cooled to room temperature, take out the reactant, filter, and deionized water Washing with ethanol in sequence and drying to obtain neodymium stannate with pyrochlore structure.

[0029] Carry o...

Embodiment 2

[0031] (1) Weigh 0.015mol of neodymium nitrate and tin tetrachloride respectively, dissolve in deionized water and stir at room temperature until completely dissolved; weigh 40g of PEG4000 and dissolve in deionized water, slowly pour into the mixed salt solution, and stir for 6h .

[0032] (2) Slowly add sodium hydroxide solution dropwise to the solution obtained in step (1) under stirring, so that the pH value of the solution is finally kept at 8 to obtain a suspension.

[0033] (3) The suspension obtained in step (2) was aged at 80° C. and stirred for 12 hours to obtain a reaction mixture.

[0034] (4) Transfer the reaction mixture obtained in step (3) to the reactor, seal it, and heat it at 150°C for 48 hours to carry out the hydrothermal reaction. After the reactor is naturally cooled to room temperature, take out the reactant, filter, and deionized water Washing with ethanol in sequence and drying to obtain neodymium stannate with pyrochlore structure.

[0035] The pyro...

Embodiment 3

[0037] (1) Weigh 0.025mol of neodymium nitrate and tin tetrachloride, dissolve in deionized water and stir at room temperature until completely dissolved; weigh 60g of PEG6000 and dissolve in deionized water, slowly pour into the mixed salt solution, and stir for 12h .

[0038] (2) Slowly add sodium hydroxide solution dropwise to the solution obtained in step (1) under stirring, so that the pH value of the solution is finally kept at 12 to obtain a suspension.

[0039] (3) The suspension obtained in step (2) was aged at 100° C. and stirred for 2 hours to obtain a reaction mixture.

[0040] (4) Transfer the reaction mixture obtained in step (3) to the reaction kettle, seal it, and keep it warm at 250°C for 6h to carry out the hydrothermal reaction. After the reaction kettle is naturally cooled to room temperature, take out the reactant, filter, and deionized water Washing with ethanol in sequence and drying to obtain neodymium stannate with pyrochlore structure.

[0041] The ...

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Abstract

The invention discloses a multifunctional neodymium stannate nanosphere composite oxide material with a single-phase pyrochlore structure. The chemical structural formula of the oxide is Nd2Sn2O7; the oxide is a composite oxide material with a single-phase pyrochlore structure synthesized by taking PEG as a crosslinking agent and using a hydrothermal method; the synthesis process is free of high-temperature roasting to recrystallize, simple in process, easy to control, free of pollution and low in cost; the obtained sample has a spherical morphology which is relatively large in specific surface area, uniform in particle distribution and relatively small in particle size. The neodymium stannate nanosphere composite oxide material with the pyrochlore structure has obvious luminescence peaks at the wavelengths 408 nm and 438 nm of a visible region, so that the application of the neodymium stannate nanosphere composite oxide material with the pyrochlore structure in the field of photoluminescence is expanded; meanwhile, the material can be used for catalytically removing the diesel vehicle tail gas and photocatalytic treatment wastewater, so that the material is a multifunctional neodymium stannate nanosphere composite oxide material with a single-phase pyrochlore structure.

Description

technical field [0001] The invention relates to a multifunctional single-phase pyrochlore structure neodymium stannate nanosphere composite oxide material, which belongs to the technical field of rare earth material preparation and application. Background technique [0002] The general structural formula of pyrochlore is A 2 B 2 o 7 (wherein A and B are respectively +3 and +4 valence cations), belonging to the cubic center system, O h 7 (ie Fd3m) space group, this structure can be considered to be composed of two cations with different radii (A 3+ , B 4+ ) and 1 / 8 anion vacancies in a fluorite-type structure. Pyrochlore composite oxides have attracted extensive attention due to their excellent thermal stability and catalytic activity at high temperatures, and have been applied in process reactions such as CO oxidation, methane combustion, CO-NO reaction, and photocatalysis. [0003] The preparation methods of pyrochlore-type composite oxide materials are mainly divide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02C09K11/78B01J23/14
Inventor 王仲鹏张晓敏王立国刘旭辉吕敏
Owner UNIV OF JINAN
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