Preparation method of porous nano material yttrium vanadate

A nanomaterial, yttrium vanadate technology, applied in the field of materials science, can solve the problems of poor catalytic effect of photocatalyst, achieve the effect of improving reaction rate and efficiency, high sample purity and simple equipment

Active Publication Date: 2016-03-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing porous nanomaterial yttrium vanadate, which solves the problem of photocatalyst catalytic effect in the prior art. bad technical problem

Method used

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  • Preparation method of porous nano material yttrium vanadate

Examples

Experimental program
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Embodiment 1

[0020] (1) Dissolve 5g of glucose in 40ml of deionized water to form a clear aqueous solution, then put the above aqueous solution in a 50ml hydrothermal reaction kettle, and conduct a hydrothermal reaction at 150°C for 4 hours. Then cool down to room temperature naturally, and separate the carbon spheres with a centrifuge. Wash three times with deionized water and absolute ethanol, and dry at 70°C.

[0021] (2) Weigh 0.2258g (1mmol) of Y 2 o 3 and 0.2340 g (2 mmol) of NH 4 VO 3 Dissolve in dilute nitric acid with a mass fraction of 15% to 20%. After complete dissolution, add 2.52g of citric acid (12mmol) as a chelating agent. After stirring for 1.5h, a uniform gel is formed.

[0022] (3) Take 0.05 g of the charcoal powder prepared in step (1) and add it to the gel, stir for another 3 hours, and then put it in an oven and dry it at 90°C for 12 hours. Finally, the obtained product was calcined at 350°C for 2h in a muffle furnace, and then calcined at 800°C for 3h. The fin...

Embodiment 2

[0025] 1) take by weighing the YVO of gained in 0.02g embodiment 1 4 The photocatalyst was dispersed in 100mL (10mg / L) rhodamine B (RhB) solution, and magnetically stirred for 20min in the dark.

[0026] 2) A UV lamp with a dominant wavelength of 320nm was placed 10cm directly above the glass reactor, and 2~3mL of the solution was taken every 10min after the photocatalysis started.

[0027] 3) After the collected samples were centrifuged at 10000 r / min for 10 min by a centrifuge, the RhB concentration was measured by a spectrophotometer.

[0028] 4) Weigh 0.02g of pure bismuth vanadate and repeat the first three steps of experiment.

[0029] figure 2 For the results obtained in the implementation of case 2 experiment, it can be seen from the figure that the photocatalyst prepared by the method of the present invention has a RhB degradation efficiency of 86.7% after 80min of light irradiation

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Abstract

The invention discloses a preparation method of a porous nano material yttrium vanadate. The preparation method comprises the following steps: firstly, preparing nano carbon spheres; then covering surfaces of the nano carbon spheres with a layer of a yttrium vanadate nano material by applying a citric acid complexing method by taking the nano carbon spheres as a template; and calcining the carbon spheres to generate CO2 gas which breaks through yttrium vanadate covering the surfaces of the carbon spheres to form gas holes on the surface of yttrium vanadate so as to generate the porous nano material yttrium vanadate. The porous nano material YVO4 disclosed by the invention has a relatively large specific area which can reach 14.37m<2> / g and is nearly four times greater than that of YVO4 not doped with carbon spheres, and the relatively large specific area can improve the reaction rate and efficiency of a pholocatalyst.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a photocatalyst yttrium vanadate, in particular to a method for preparing porous nanomaterial yttrium vanadate. Background technique [0002] Photocatalysts are semiconductor materials that play an important role in utilizing solar energy to solve energy and environmental problems. In the past few decades, a great deal of effort has been devoted to the development of new semiconductor photocatalytic oxidants. It is expected to use sunlight to purify air, separate sewage and generate clean hydrogen. Among many semiconductor photocatalysts, the vanadate family (such as InVO 4 , BiVO 4 ,M 3 V 2 o 8 (M=Mg, Ni, Zn) attracts the attention of scientists because the electrons on the third orbital of the V element can be excited by light to become free electrons. [0003] The sol-gel method is to prepare the reactant precursor into a mixed solution, gel treatment to form a gel, and fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B82Y40/00B01J23/22B01J35/04B01J35/10
CPCB01J23/22B01J35/004B01J35/04B01J35/1014C01G31/00C01P2004/03C01P2006/12
Inventor 吴江倪补赵栩莹梁攀坤周静官贞珍王健敏赵丽丽赵镇张静张文博周肖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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