A kind of preparation method of porous nano material yttrium vanadate

A nano-material, yttrium vanadate technology, applied in the field of materials science, can solve problems such as poor catalytic effect of photocatalysts, achieve the effects of improving reaction rate and efficiency, high sample purity, and cheap raw materials

Active Publication Date: 2017-05-03
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Description
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  • 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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  • A kind of preparation method of porous nano material yttrium vanadate
  • A kind of preparation method of porous nano material yttrium vanadate

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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-mentioned aqueous solution in a 50ml hydrothermal reactor, and conduct hydrothermal reaction at 150°C for 4h. Then cooled to room temperature naturally, and the carbon balls were separated out by a centrifuge. They were washed three times with deionized water and absolute ethanol, respectively, and dried at 70 °C.

[0021] (2) Weigh 0.2258g (1 mmol) of Y 2 O 3 and 0.2340 g (2 mmol) of NH 4 VO 3 It was dissolved in dilute nitric acid with a mass fraction of 15% to 20%. After it was completely dissolved, 2.52 g of citric acid (12 mmol) was added as a chelating agent. After stirring for 1.5 h, a uniform gel was formed.

[0022] (3) 0.05 g of carbon powder obtained in step (1) was added to the gel, stirred for 3 h, and then placed in an oven and dried at 90 °C for 12 h. Finally, the obtained product was calcined in a muffle furnace at 350 °C for 2 h, and then calc...

Embodiment 2

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

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

[0027] 3) After the collected samples were centrifuged at 10,000 r / min for 10 min, the RhB concentration was determined by a spectrophotometer.

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

[0029] figure 2 In order to implement the results obtained in the experiment of Case 2, it can be seen from the figure that the RhB degradation efficiency of the photocatalyst prepared by the method of the present invention is 86.7% after 80min of illumination.

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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 materials science and relates to a photocatalyst yttrium vanadate, in particular to a preparation method of a porous nanomaterial yttrium vanadate. Background technique [0002] Photocatalysts are semiconductor materials that play an important role in using 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 that sunlight can be used to purify air, separate sewage and generate clean hydrogen energy. 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 in the third orbital of V element can be excited to free electrons by light. [0003] The sol-gel method is to prepare the reactant precursor into a mixed solution, gelatinize to form a gel, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C01G31/00B82Y40/00B01J35/04B01J35/10
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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