A kind of preparation method of bismuth vanadate composite material coated with mesoporous silica on the surface

A technology of mesoporous silica and composite materials, which can be used in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., and can solve the problem of not forming a core-shell structure.

Active Publication Date: 2020-10-30
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Description
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Problems solved by technology

Patent CN104830099A discloses a preparation method of coated silica-bismuth vanadate-barium sulfate bright yellow pigment. This technology compound a layer of bismuth vanadate on the surface of barium sulfate, which greatly reduces the cost of bismuth vanadate as a yellow pigment , but the invention patent did not form a regular bismuth vanadate@mesoporous silica core-shell structure
In order to improve this technology and fill up the gaps in this technology, the present invention provides a new method using metal-polyphenol complexes as a template to prepare a bismuth vanadate composite material coated with mesoporous silica. The report of this kind of technology explores a new path for the development of new materials

Method used

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  • A kind of preparation method of bismuth vanadate composite material coated with mesoporous silica on the surface
  • A kind of preparation method of bismuth vanadate composite material coated with mesoporous silica on the surface
  • A kind of preparation method of bismuth vanadate composite material coated with mesoporous silica on the surface

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Experimental program
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Embodiment 1

[0028] BiVO 4 The sample preparation steps are as follows:

[0029] Step A: get the bismuth salt of 0.02mol and be dissolved in the concentrated nitric acid of 20mL to obtain homogeneous solution, stir 2h; Described bismuth salt is Bi(NO 3 ) 3 ·5H 2 O or BiCl 3 ; The vanadium-containing compound is NH 4 VO 3 or Na 3 VO 4 ;

[0030] Step B: 0.02mol of vanadium-containing compound was dissolved in 20mL of 6M NaOH aqueous solution;

[0031] Step C: Add the solution obtained in step B to the solution obtained in step A, then add 0.1 to 0.5 g of cetyltrimethylammonium bromide (CTAB) into the obtained solution, stir for 2 hours, then slowly add 30 mL of 6M NaOH Aqueous solution, to obtain a uniform suspension, stirred for 2h;

[0032] Step D: Add the solution obtained in step 3 into a 100 mL stainless steel reaction kettle lined with polytetrafluoroethylene, keep it at 180 ° C for 48 h, centrifuge the obtained product with deionized water for several times, and then dry it...

Embodiment 2

[0034] Weigh the 1.23mmol BiVO that embodiment 1 obtains 4 (0.4g) sample, add 1.23mmol gallic acid (0.21g) according to molar ratio n (gallic acid: bismuth vanadate)=1:1, add 15mL deionized water and mix well, then according to ferric chloride: bismuth vanadate sample The molar ratio is 0.5:1, adding 0.615mmol ferric chloride (0.1g), stirring at room temperature for 24 hours, the resulting product is separated, washed and dried to obtain bismuth vanadate@iron-gallic acid complex core-shell structure composite material ( Marked as 0.5BiVO 4 @Fe Ⅲ -GA). The obtained bismuth vanadate@iron-gallic acid product was added to a solution containing CTAB and ammonia water for 10 minutes of ultrasonication, then TEOS was added dropwise to the above mixed solution and crystallized at 80°C for 2 hours, the obtained product was washed with water and ethanol and dried dry, and finally calcined at 550° C. for 6 hours in an air atmosphere to obtain the bismuth vanadate composite material wh...

Embodiment 3

[0037] Weigh the 1.23mmol BiVO that embodiment 1 obtains 4 (0.4g) sample, add 0.75mmol tannic acid (1.28g) according to molar ratio n (tannic acid: bismuth vanadate)=0.61:1, add 15mL deionized water and mix well, then according to ruthenium chloride: vanadate The molar ratio of the bismuth sample is 0.02:1, add 0.025mmol ruthenium chloride (0.005g), and stir at room temperature for 24h. The resulting product is separated, washed and dried to obtain the target product bismuth vanadate@ruthenium-tannic acid complex core-shell structure composite material (marked as 0.02BiVO 4 @Ru Ⅲ-TA). The obtained bismuth vanadate@ruthenium-tannic acid product was added to a solution containing CTAB and ammonia water for 10 minutes, and then TEOS was added dropwise to the above mixture and crystallized at 80°C for 2 hours. The obtained product was washed with water and ethanol and drying, and finally calcining at 550° C. for 6 hours in an air atmosphere to obtain the bismuth vanadate compos...

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Abstract

The invention provides a method for preparing a bismuth vanadate composite material with a mesoporous silica coated surface. The method comprises the following steps: firstly, preparing bismuth vanadate by using a hydrothermal method, mixing the bismuth vanadate with a metal salt solution and a polyphenol compound at a normal temperature and normal pressure, carrying out coordination on the metaland polyphenol compounds coat the surface of the bismuth vanadate by a metal-polyphenol complex shell layer so as to obtain a composite material of a bismuth vanadate @ metal-polyphenol complex core-shell structure, coating the surface of the bismuth vanadate @ metal-polyphenol complex core-shell structure by mesoporous silica by using a sol-gel method, and finally roasting in an air atmosphere toremove a metal-polyphenol complex template, so as to obtain the bismuth vanadate composite material with the mesoporous silica coated surface. The bismuth vanadate @ mesoporous silica core-shell material prepared by using the method is novel in morphology, regular in structure and in addition large in specific surface area, and the synthesized material has a wide application prospect in fields such as catalysis, environment protection and biomedicines.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a method for preparing a bismuth vanadate composite material whose surface is coated with mesoporous silicon dioxide. Background technique [0002] Due to its ordered and adjustable nanopores, high thermal stability and large specific surface, mesoporous silica can increase the stability of the central particle, improve the mechanical properties of the material, and increase the durability of the material to prolong the service life. considered an ideal carrier. Recently, Song Weiguo's research group has greatly improved the photocatalytic activity and stability of the catalyst by loading mesoporous silica on copper oxide sol nanoclusters and hierarchical flower-like magnesium oxide (J.Mater.Chem.2011, 21, 5774-5779; Chem. Commun. 2013, 49, 6093-6095). It can be expected that the method of coating with mesoporous silica will make the material have a large specific surface a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J35/02B01J35/10B01J37/08B01J37/03
CPCB01J23/22B01J35/026B01J35/1023B01J35/1061B01J37/0018B01J37/036B01J37/038
Inventor 陈伟胡银谢欣廖岩松翁雅青宋卫国
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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