Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Magnetic bentonite loaded spherical BiOBr, preparation method and application thereof

A bentonite and magnetic technology, applied in the field of visible light catalyst preparation, can solve the problems of reducing the utilization efficiency of visible light, hindering photocatalytic efficiency, unfavorable industrial application, etc., and achieve the effect of repeated use of photocatalytic activity, enhanced adsorption and enrichment ability, and low cost

Pending Publication Date: 2020-07-03
GUANGXI UNIV
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although BiOBr can be directly excited by visible light, its activity is still low when it is used alone as a photocatalyst. On the one hand, catalysts derived from micro-nanoparticles are prone to agglomeration, which reduces the utilization efficiency of visible light. The high recombination rate of photogenerated electron-hole pairs is not conducive to the generation of free photogenerated electrons and holes on the semiconductor surface, hindering the improvement of photocatalytic efficiency, and at the end of the reaction process, it is difficult to separate the powdered BiOBr photocatalyst from the reaction system Recycling, easy to lose and cause high process cost, which is not conducive to actual industrial application

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
  • Magnetic bentonite loaded spherical BiOBr, preparation method and application thereof
  • Magnetic bentonite loaded spherical BiOBr, preparation method and application thereof
  • Magnetic bentonite loaded spherical BiOBr, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of Spherical BiOBr Visible Light Catalyst

[0057] (1) 1.455g (3mmol) (BiNO 3 )·5H 2 O was dissolved in 40ml of 5% HAc solution, dispersed by ultrasonic and stirred for 5min until the solution was clarified to obtain (BiNO 3 )·5H 2 O solution.

[0058] (2) 0.357g (3mmol) KBr was added to (BiNO 3 )·5H 2 O solution and stirring (theoretical amount of BiOBr generated is 0.914g), the stirring speed is 250rpm·min -1 , the stirring time was 20min, and a suspension with a white precipitate was obtained, and the suspension was washed with 80ml of deionized water until neutral.

[0059] (3) Add 40ml of deionized water after pouring off the washing liquid, and carry out microwave heating reaction. Wash by centrifugation for 3 times, and then dry in vacuum at 80° C. for 12 h to obtain a spherical BiOBr visible photocatalyst.

Embodiment 2

[0061] Preparation of Magnetic Bentonite Base

[0062] (1) Dissolve 0.0914g of bentonite in 20ml of ultrapure water, disperse and stir for 20min by ultrasonic to obtain bentonite suspension;

[0063] (2) 0.10812g (0.4mmol) FeCl 3 ·6H 2 O and 0.04g (0.2mmol) FeCl 2 4H 2 O dissolved in 60ml deionized water (theoretical Fe 3 o 4 The production amount is 0.0427g), first microwave preheating for 3min, then add 8ml of ammonia water, then carry out microwave heating reaction for 30min, the microwave parameters are: 60°C, 600W; then aging and stirring, the stirring rate is 200rpm·min -1 , the stirring time is 10min, and then cooled to room temperature to obtain a magnetic fluid containing magnetic precipitation;

[0064] (3) Wash the magnetic fluid once with 200 ml of deionized water under the condition of an external magnetic field, then add it into the bentonite suspension and stir for 3 hours to obtain the magnetic fluid, and then dry it to obtain the magnetic bentonite base....

Embodiment 3

[0066] Preparation of BiOBr-MB with 2.5% magnetic content

[0067] A preparation method of spherical BiOBr (abbreviated: BiOBr-MB) supported by magnetic bentonite with 2.5% magnetic content, the method is: using potassium bromide as bromine source, bismuth nitrate pentahydrate as bismuth source, and acetic acid as solvent to prepare BiOBr Precursor, with magnetic bentonite as the loading matrix and water as the dispersant, the BiOBr precursor is first embedded in the interlayer of the magnetic bentonite base and deposited on the surface of the magnetic bentonite base, and then microwave-assisted hydrothermal method is used to pass through high-temperature pressurized The function realizes self-assembly in situ, and BiOBr-MB with 2.5% magnetic content is obtained. Specific steps are as follows:

[0068] (1) Preparation of BiOBr precursor solution: 1.455g (3mmol) (BiNO 3 )·5H 2 O was added to 40ml of 5% HAc solution, ultrasonically dispersed and stirred for 5min until the sol...

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses spherical BiOBr loaded by magnetic bentonite, a preparation method and application thereof. The preparation method comprises the following steps: embedding a BiOBr precursor between layers of a magnetic bentonite base and / or depositing the BiOBr precursor on the surface of the magnetic bentonite base, and then realizing in-situ self-assembly under the action of high-temperature pressurization by utilizing a microwave-assisted hydrothermal method to obtain the spherical BiOBr loaded by the magnetic bentonite. According to the invention, the prepared spherical BiOBr loaded by the magnetic bentonite has a large specific surface area and excellent magnetic separation performance while the forbidden band width is narrowed, so that the magnetic bentonite loaded sphericalBiOBr has high visible light absorption capacity, the recombination efficiency of electron hole pairs is reduced, and efficient degradation of tetracycline, ciprofloxacin and other organic solutions is achieved under visible light; and under the action of an external magnetic field, the magnetic bentonite loaded spherical BiOBr can be rapidly recycled, and the magnetic bentonite loaded spherical BiOBr has good repeated utilization rate and stable performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of visible light catalysts, and in particular relates to spherical BiOBr supported by magnetic bentonite and its preparation method and application. Background technique [0002] Due to the characteristics of green, new and effective, photocatalytic technology has been widely used in energy and the environment. It uses photocatalytic materials to convert solar energy into chemical energy to achieve production capacity or degrade pollutants. The chemical reaction conditions are mild, the energy consumption is low and the efficiency is low. High, while no secondary pollution, outstanding advantages. So far, TiO 2 It is the most widely studied semiconductor photocatalyst, but it is difficult to be widely used due to its wide band gap, low utilization efficiency of visible light and easy recombination of photogenerated electron-hole pairs. In order to effectively utilize sunlight, photocatalytic ...

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): B01J27/06B01J37/10B01J37/34B01J37/03C02F1/30C02F101/30C02F101/34C02F101/38
CPCB01J27/06B01J37/10B01J37/346B01J37/031C02F1/30C02F2101/30C02F2305/10C02F2101/34C02F2101/38B01J35/33B01J35/39
Inventor 童张法张寒冰刘坤朱颖汤睿
Owner GUANGXI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com