Visible light catalyst BiVO4 and preparation method thereof

A catalyst, visible light technology, applied in the field of preparation of a new three-dimensional connected pore structure visible light catalyst BiVO4, can solve the problems of coarse bismuth vanadate particles, poor photocatalytic performance, small specific surface area, etc., to reduce synthesis cost, large specific surface area, small particle effect

Inactive Publication Date: 2010-08-04
HUAZHONG UNIV OF SCI & TECH
View PDF1 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bismuth vanadate prepared by the traditional solid-state reaction method has poor photocatalytic performance due to its coarse particles and small specific surface area. However, the hydrothermal method that is currently widely used mostly uses the addition of templates and surfactants to adjust the shape of the material. appearance structure, complicated operation and high price

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Visible light catalyst BiVO4 and preparation method thereof
  • Visible light catalyst BiVO4 and preparation method thereof
  • Visible light catalyst BiVO4 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 2.4255g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 100ml ethylene glycol (EG) to prepare Bi ion concentration of 0.05mol L -1 After the solution, add 0.5849g ammonium metavanadate (NH 4 VO 3 ), ultrasonically oscillated for 20 min, and stirred thoroughly to dissolve completely. After the solution was clear and transparent, it was transferred to a constant temperature water bath and kept at 60°C for 7 days to obtain a flocculent precipitate. Remove the EG supernatant, add distilled water to wash, and centrifuge. After repeating this five times, wash with alcohol and centrifuge twice, and dry the obtained precipitate in an oven. The dried material was calcined at 400 °C for 2.5 h to obtain a three-dimensional connected pore structure visible photocatalyst BiVO 4 . After XRD analysis ( figure 1 ), the main phase of the material is bismuth vanadate with monoclinic scheelite structure, corresponding to the standard card JCPD fileNo.01-075-1866. ...

example 2

[0026] 5.7916g bismuth acetate pentahydrate (Bi(CH 3 COO) 3 ·5H 2 O) dissolved in 150ml ethylene glycol (EG) to form a Bi ion concentration of 0.1mol L -1 After the solution, according to Bi:V=1:1.5, add 2.6320g ammonium metavanadate (NH 4 VO 3 ), ultrasonically oscillate for 20 min, and stir well to dissolve it. After the solution was clear and transparent, it was transferred to a constant temperature water bath and kept at 90°C for 2 days to obtain a flocculent precipitate. Remove the EG supernatant, add distilled water to wash, and centrifuge. After repeating this five times, wash with alcohol and centrifuge twice, and dry the obtained precipitate in an oven. The dried material was calcined at 350°C for 3h to obtain a three-dimensional interconnected pore structure visible photocatalyst BiVO 4 .

example 3

[0028] 3.1534g bismuth chloride (BiCl 3 ) dissolved in 200ml ethylene glycol (EG) to form a Bi ion concentration of 0.5mol L -1 After the solution, according to Bi:V=1:2, add 3.6782g sodium vanadate (Na 3 VO 4 ), ultrasonically oscillate for 20 min, and stir well to dissolve it. After the solution was clear and transparent, it was transferred to a constant temperature water bath and kept at 80°C for 4 days to obtain a flocculent precipitate. Remove the EG supernatant, add distilled water to wash, and centrifuge. After repeating this five times, wash with alcohol and centrifuge twice, and dry the obtained precipitate in an oven. The dried material was calcined at 500 °C for 1.5 h to obtain a three-dimensional interconnected pore structure visible photocatalyst BiVO 4 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
mesoporeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a visible light catalyst BiVO4 and a preparation method thereof. The BiVO4 is powder, the crystalline phase is monoclinic crystal serial scheelite structure, and the feature thereof is in a three-dimensional connected pore channel structure. In the preparation method, ethanediol is utilized as solvent, and bismuth salt and vanadium salt are respectively used as a Bi source and a V source for preparing the three-dimensional connected pore channel structural BiVO4. The preparation method is as follows: dissolving bismuth salt and vanadium salt into ethanediol according to the proportion that Bi / V equals to 1:0.5-1:2 to prepare solution the Bi ion concentration of which is 0.05-0.5mol.L<-1>; forming even settled solution, and then transferring the settled solution to a constant-temperature water bath tank of 50-90 DEG C to preserve heat for 2-10 days; and after obtaining flocks, centrifuging, washing, drying and finally calcining obtained powder at the temperature of 350-600 DEG C for 1-3h in air environment. In the invention, no surfactant is utilized, and the catalyst with novel structure and very large specific surface area is obtained after simple heat preservation in the water bath tank and later-stage low temperature heat treatment. The catalyst has smaller particles and higher photocatalysis activity, thus being applied to degrading organic pollutants by visible light catalyst.

Description

technical field [0001] The invention belongs to the field of photocatalyst materials, in particular to a novel three-dimensional interconnected pore structure visible light catalyst BiVO 4 The preparation method, the obtained catalyst can be used to degrade harmful substances in the environment. Background technique [0002] In recent years, environmental pollution and energy crisis have brought more and more serious challenges to human survival. Photocatalytic technology, as an advanced oxidation process technology, has emerged at the historic moment and has achieved remarkable development. Titanium dioxide (TiO 2 ) has become the most widely studied photocatalyst due to its stable chemical properties, superior catalytic activity, non-toxicity, and low cost. However, due to the limitation of the wide band gap (3.2ev), TiO 2 Only the ultraviolet light less than 388nm can be used, and the visible light which accounts for 45% of the sunlight energy is very little. Therefor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22
Inventor 曾大文刘宏伟谢长生
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap