Method for synthesizing monoclinic phase mesoporous bismuth vanadate through template method

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...

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.

"A preparation of rugby-shaped mesoporous BiVO 4 Organic solvent-hydrothermal method" (Chinese invention patent, application number: 200910243646.1) reported the preparation of mesoporous structure BiVO by organic solvent-hydrothermal method 4 However, the hydrothermal method has the disadvantages of high equipment requirements, high technical difficulty and poor safety performance.