Method for synthesizing monoclinic phase mesoporous bismuth vanadate through template method

A technology of porous bismuth vanadate and monoclinic phase, which is applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of low photocatalytic efficiency, limit the application of bismuth vanadate, and high equipment requirements, and achieve high photocatalytic efficiency. Catalytic activity, good photocatalytic performance, low equipment requirements

Inactive Publication Date: 2013-03-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the bismuth vanadate prepared by these methods is powder and lacks a pore structure, resulting in low photocatalytic efficiency, which limits the further application of bismuth vanadate in the field of visible light photocatalytic degradation of pollutants.
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Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1:

[0019] The first step, preparation of bismuth nitrate solution and ammonium metavanadate solution

[0020] Take the quantity of nitric acid: ethanol: bismuth nitrate=1:28:0.2, and ultrasonicate for 30 minutes to obtain the bismuth nitrate solution. Measure nitric acid: ethanol: ammonium metavanadate=1:28:0.05 parts by mass, ultrasonic for 10min to obtain ammonium metavanadate solution.

[0021] The second step, preparation of bismuth vanadate and silica aerogel microsphere composite

[0022] The ammonium metavanadate solution was slowly added dropwise to the bismuth nitrate solution to obtain a mixed solution of ammonium metavanadate and bismuth nitrate, wherein the mass ratio of ammonium metavanadate and bismuth nitrate was 1:4. First put the silica aerogel microspheres in a container to vacuum, and then slowly drop the mixed solution of ammonium metavanadate and bismuth nitrate into the container, where the silica aerogel microspheres and bismuth nitrate are in ...

Example Embodiment

[0027] Example 2:

[0028] The first step, preparation of bismuth nitrate solution and ammonium metavanadate solution

[0029] Take the amount of nitric acid: ethanol: bismuth nitrate=1:22:0.35 by mass, and ultrasonicate for 30 minutes to obtain a bismuth nitrate solution. Measure nitric acid: ethanol: ammonium metavanadate=1:22:0.087 parts by mass, ultrasonic for 10min to obtain ammonium metavanadate solution.

[0030] The second step, preparation of bismuth vanadate and silica aerogel microsphere composite

[0031] The ammonium metavanadate solution was slowly added dropwise to the bismuth nitrate solution to obtain a mixed solution of ammonium metavanadate and bismuth nitrate, wherein the mass ratio of ammonium metavanadate and bismuth nitrate was 1:4. First put the silica aerogel microspheres in a container to vacuum, and then slowly drop the mixed solution of ammonium metavanadate and bismuth nitrate into the container, where the silica aerogel microspheres and bismuth nitrate a...

Example Embodiment

[0034] Example 3:

[0035] The first step, preparation of bismuth nitrate solution and ammonium metavanadate solution

[0036] Take the quantity of nitric acid: ethanol: bismuth nitrate=1:15:0.5, and ultrasonicate for 30 minutes to obtain the bismuth nitrate solution. Measure nitric acid: ethanol: ammonium metavanadate=1:15:0.125 parts by mass, ultrasonic for 10min to obtain ammonium metavanadate solution.

[0037] The second step, preparation of bismuth vanadate and silica aerogel microsphere composite

[0038] The ammonium metavanadate solution was slowly added dropwise to the bismuth nitrate solution to obtain a mixed solution of ammonium metavanadate and bismuth nitrate, wherein the mass ratio of ammonium metavanadate and bismuth nitrate was 1:4. First put the silica aerogel microspheres in a container to vacuum, and then slowly drop the mixed solution of ammonium metavanadate and bismuth nitrate into the container, where the silica aerogel microspheres and bismuth nitrate are in...

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Abstract

The invention relates to a method for synthesizing monoclinic phase mesoporous bismuth vanadate through a template method. The method comprises the following steps of: mixing nitric acid, ethanol and bismuth nitrate which are weighed in a mass ratio of 1:(2.8-28):(0.2-1) by ultrasonic wave, so as to obtain a bismuth nitrate solution; mixing nitric acid, ethanol and ammonium meta-vanadate which are weighed in a mass ratio of 1:(2.8-28):(0.05-0.25) by ultrasonic wave, so as to obtain an ammonium meta-vanadate solution; dropping the ammonium meta-vanadate solution slowly into the bismuth nitrate solution, so as to obtain a mixed solution; adding silicon dioxide aerogel microspheres to be used as a template, evacuating in order to fully inject the mixed solution in the template, reacting for 6 hours to 24hours at the temperature of 60 DEG C to 110 DEG C, so as to obtain solid products; and finally, heating the solid products to 160 DEG C to 400 DEG C in a tube furnace at the heating rate of 0.5 DEG C per minute to 10 DEG C per minute, roasting for 2 hours to 24 hours, naturally cooling to room temperature, and then removing the template by using a sodium hydroxide solution to obtain the monoclinic phase mesoporous bismuth vanadate with average aperture distribution (1nm to 20nm). The method provided by the invention is simple and easy to control in process and is environment-friendly; and the monoclinic phase mesoporous bismuth vanadate obtained by the method has excellent photo-catalytic performance within the range of visible light.

Description

technical field [0001] The invention relates to a method for synthesizing monoclinic mesoporous bismuth vanadate by a template method, and the monoclinic mesoporous bismuth vanadate with uniform pore size distribution can be prepared by the method. The method has the characteristics of environmental friendliness, mild conditions, simple and easy-to-control process, and the obtained monoclinic mesoporous bismuth vanadate has good photocatalytic performance in the range of visible light. Background technique [0002] Photocatalytic technology is an effective way to solve environmental and energy problems. The photo-splitting water technology that converts solar energy into clean hydrogen energy can solve the crisis of fossil energy depletion, and photocatalytic degradation to remove toxic organic pollutants will be able to economically and effectively solve environmental problems. As early as 1972, Japanese scientists Fujishima and Honda discovered TiO 2 Decompose water to p...

Claims

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Application Information

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IPC IPC(8): C01G31/00B01J23/22
Inventor 刘明贤姚明明甘礼华
Owner TONGJI UNIV
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