Visible-light catalyst Bi3O4Br and preparation method thereof

A photocatalyst and visible light technology, applied in the field of Bi3O4Br and its preparation, can solve problems such as thermodynamic instability, and achieve the effects of small industrial amplification factor, good visible light catalytic activity, and easy process

Inactive Publication Date: 2012-07-11
HUAZHONG NORMAL UNIV
View PDF1 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that the widely used titanium dioxide is only active in the ultraviolet region. In order to improve its visible light activity, researchers use doping or ion implantation methods to modify titanium dioxide. Doping usually also acts as the active center of photogenerated electrons and holes. However, doped substances often have thermodynamic instability, and the doping process usually requires noble metal ions

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 Bi3O4Br and preparation method thereof
  • Visible-light catalyst Bi3O4Br and preparation method thereof
  • Visible-light catalyst Bi3O4Br and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Bi 3 o 4 Br is prepared, and its preparation steps are as follows:

[0026] Step 1: Add deionized water, bismuth salt and quaternary ammonium salt into a 150mL reactor, the concentration of bismuth salt is 0.02-0.04 mol / liter, the concentration of quaternary ammonium salt is 0.02-0.05 mol / liter, and the quaternary ammonium The molar ratio of the salt to the bismuth salt is greater than or equal to 1, and the bismuth salt is bismuth nitrate pentahydrate; the quaternary ammonium salt is cetyltrimethylammonium bromide;

[0027] Step 2: Add a sodium hydroxide solution with a concentration of 1 mol / liter to the reaction kettle in step 1 to adjust the pH to 11.0-12.5, stir for not less than 0.5 hours, and then perform hydrothermal treatment at a temperature of 160-180°C, constant temperature 12-18 hours;

[0028] Step 3: After the completion of step 2, centrifuge the solid product, wash the obtained solid product with deionized water and absolute ethanol for no less than 3...

Embodiment 2

[0030] Bi 3 o 4 Br is prepared, and the preparation steps are:

[0031] Step 1: Add 50mL of deionized water to a 150mL reactor, add bismuth nitrate pentahydrate and cetyltrimethylammonium bromide, so that the concentration of bismuth nitrate is 0.02 mol / liter, cetyltrimethylammonium bromide The concentration of ammonium chloride is 0.027 mol / liter;

[0032] Step 2: Stir the mixed solution in step 1 at room temperature for 10 minutes, adjust the pH to 11 with 1 mol / liter of sodium hydroxide, stir for 1 hour, and then subject the mixed solution to hydrothermal treatment at a temperature of 160° C. for 18 hours at a constant temperature;

[0033] Step 3: After the completion of step 2, centrifuge the solid product, wash the obtained solid product three times with deionized water and absolute ethanol, and dry the product at 50°C for 6 hours to obtain light yellow Bi 3 o 4 Br solid powder.

Embodiment 3

[0035] Bi 3 o 4 Br is prepared, and the preparation steps are:

[0036] Step 1: Add 50mL of deionized water to a 150mL reactor, add bismuth nitrate pentahydrate and cetyltrimethylammonium bromide, so that the concentration of bismuth nitrate is 0.03 mol / liter, cetyltrimethylammonium bromide The concentration of ammonium chloride is 0.04 mol / liter;

[0037] Step 2: Stir the mixed solution in step 1 at room temperature for 10 minutes, adjust the pH to 12.5 with 1 mol / liter of sodium hydroxide, stir for 1 hour, then subject the mixed solution to hydrothermal treatment at a temperature of 180° C., and keep the temperature constant for 18 hours;

[0038] Step 3: After the completion of step 2, centrifuge the solid product, wash the obtained solid product three times with deionized water and absolute ethanol, and dry the product at 50°C for 6 hours to obtain light yellow Bi 3 o 4 Br solid powder.

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

No PUM Login to view more

Abstract

Provided are a visible-light catalyst Bi3O4Br and a preparation method thereof. The method comprises adding deionized water, bismuth salt and quaternary ammonium salt into a reaction kettle to obtain the bismuth salt with concentration of 0.02-0.04 molar / liter and the quaternary ammonium salt with concentration of 0.02-0.05 molar / liter, wherein the molar ratio of the bismuth salt to the quaternary ammonium salt is larger than or equal to one; adding caustic soda solution with concentration of 1 molar / liter into the mixture with stirring to regulate potential of hydrogen (pH) to be 11.0-12.5; stirring and performing hydro-thermal treatment at the treatment temperature of 160-180 DEG C; after keeping the constant temperate for 12-18 hours, centrifugally separating solid products; respectively washing the obtained solid products through the deionized water and absolute ethyl alcohol for at least three times; and drying the products at the temperature of 50 DEG C for at least 6 hours to obtain light-yellow Bi3O4Br solid powder. The Bi3O4Br has good visible-light activity and can have strong degradation to various pollutants under the irradiation of the visible light. In addition, the method is simple in synthesis, the whole synthesis process is easy to control, raw materials are easily obtained, and the cost is low.

Description

technical field [0001] The invention relates to a novel visible light catalyst bismuth oxybromide and a preparation method thereof, in particular to Bi 3 o 4 Br and its preparation method. Background technique [0002] Photocatalysis is a research field that has gradually emerged since the 1970s. Photocatalysts based on semiconductor materials have been widely studied in recent years, mainly due to their wide application in solar energy conversion and environmental purification. It is well known that a large proportion of the solar spectrum is due to visible light, so the preparation and research of catalysts with visible light activity have attracted much attention. We know that the widely used titanium dioxide is only active in the ultraviolet region. In order to improve its visible light activity, researchers use doping or ion implantation methods to modify titanium dioxide. Doping usually also acts as the active center of photogenerated electrons and holes. However, t...

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): B01J27/06C02F1/30
CPCY02W10/37
Inventor 张礼知王吉玲
Owner HUAZHONG NORMAL UNIV
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