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Chitosan hybrid bismuth oxybromide micro-nano multi-layer material and preparation and application thereof

A technology of bismuth oxybromide and chitosan, applied in the field of composite materials and photocatalysis, can solve the problems of complicated operation, few active sites, small absorption range, etc., and achieve high photocatalytic activity, good application prospect, and the effect of broadening absorption.

Active Publication Date: 2019-07-09
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most bismuth oxybromide photocatalysts have disadvantages such as fewer active sites, and some bismuth oxybromide catalytic materials with higher activity have problems such as cumbersome operation and high prices of solvents and auxiliary materials.
Therefore, it is an inevitable trend in the development of bismuth oxybromide photocatalytic materials to develop a simple, cheap, and environmentally friendly method to prepare and solve the problems of small light absorption range in the visible light region and low catalyst specific surface area and few active sites.

Method used

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  • Chitosan hybrid bismuth oxybromide micro-nano multi-layer material and preparation and application thereof
  • Chitosan hybrid bismuth oxybromide micro-nano multi-layer material and preparation and application thereof
  • Chitosan hybrid bismuth oxybromide micro-nano multi-layer material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take 1.0 g of chitosan with a molecular weight of 15 kDa, add it to 20 mL of nitric acid solution (2 mol / L), stir to make it completely dispersed, and obtain a chitosan dispersion;

[0028] (2) Take 5.0 g of bismuth nitrate, add it to 30 mL of nitric acid solution (2 mol / L), stir to dissolve it completely, and obtain bismuth nitrate solution;

[0029] (3) Take 2.0 g of cetyl ammonium bromide, dissolve it in 10 mL of water, stir it to dissolve completely, and obtain bromide salt solution;

[0030] (4) Under magnetic stirring, slowly add the chitosan dispersion into the bismuth nitrate solution, and magnetically stir for 20 minutes to ensure that the reaction system is evenly dispersed; Slowly added to the reaction system, and stirred for 40 min; then, the reaction system was moved into a PPL-lined stainless steel reactor, and hydrothermally reacted at 200°C for 9 h. The obtained product was separated by suction filtration, washed 6 times with distilled water, and vac...

Embodiment 2

[0032] (1) Take 1.5 g of chitosan with a molecular weight of 20 kDa, add it to 30 mL of acetic acid solution (10 wt%), stir to make it completely dispersed, and obtain a chitosan dispersion;

[0033] (2) Take 3.0 g of bismuth nitrate, add it to 30 mL of glacial acetic acid solution (10 wt%), stir to dissolve it completely, and obtain a bismuth nitrate solution;

[0034] (3) Dissolve 1.5 g of potassium bromide in 10 mL of water, stir to dissolve completely, and obtain potassium bromide solution;

[0035](4) Under magnetic stirring, slowly add the chitosan dispersion into the bismuth nitrate solution, and magnetically stir for 20 minutes to ensure that the reaction system is evenly dispersed; then slowly add the potassium bromide solution into the reaction system within 5 minutes under stirring and stirred for 40 min; then, the reaction system was transferred into a PPL-lined stainless steel reactor, and hydrothermally reacted at 120 °C for 15 h. The obtained product was separat...

Embodiment 3

[0037] (1) Take 0.5 g of chitosan with a molecular weight of 5 kDa, add it to 15 mL of nitric acid solution (4 mol / L), stir to make it completely dispersed, and obtain a chitosan dispersion;

[0038] (2) Take 2.5 g of bismuth bromide, add 25 mL of acetic acid solution (10 wt%), stir to dissolve completely, and obtain bismuth nitrate solution;

[0039] (3) Take 1.0 g of hexadecyl ammonium bromide, dissolve it in 10 mL of aqueous solution, stir to dissolve it completely, and obtain potassium bromide solution;

[0040] (4) Under magnetic stirring, slowly add the chitosan dispersion into the bismuth nitrate solution, and magnetically stir for 30 minutes to ensure that the reaction system is evenly dispersed; then slowly add the potassium bromide solution into the reaction system within 15 minutes under stirring and stirred for 40 min; then, the reaction system was transferred into a PPL-lined stainless steel reactor, and hydrothermally reacted at 220 °C for 12 h. The obtained prod...

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Abstract

The invention discloses a preparation method of a chitosan hybrid bismuth oxybromide micro-nano multi-layer material. The preparation method comprises the steps of: slowly adding a chitosan dispersioninto a bismuth salt solution, conducting magnetic stirring for even dispersing; slowly adding a bromine salt solution into the system under stirring, conducting stirring for even dispersing, then transferring the reaction system into a reaction kettle, conducting hydrothermal reaction at 120-300 DEG C for 6-20 h, and separating a product by suction filtration, conducting washing with distilled water, and conducting drying in vacuum to obtain the chitosan bismuth oxybromide micro-nano multilayer material. According to the invention, chitosan is adopted as a template guiding agent and a structure inducing agent, and a bismuth salt is combined with a bromine salt to form bismuth oxybromide by polymer hydrothermal assist, and the bismuth oxybromide photocatalytic material is promoted by an amino group in a chitosan molecular segment to have highly exposed crystal plane and rich oxygen vacancies, thus further the absorption of the catalyst in a visible region is expanded, and the chitosanhybrid bismuth oxybromide micro-nano multi-level photocatalytic material has high photocatalytic activity under simulated sunlight.

Description

technical field [0001] The invention relates to a preparation method of a chitosan hybrid bismuth oxybromide micro-nano multi-level material, which is mainly used as a photocatalyst for the degradation treatment of organic pollutants, and belongs to the technical field of composite materials and the technical field of photocatalysis. Background technique [0002] Water resources are an indispensable natural resource in human production and life. However, with the frequent industrial activities of human beings, the phenomenon of water pollution has become more and more serious, and it has gradually become the main environmental problem that countries need to solve. For example: a variety of organic dyes in textile wastewater are not only carcinogens, but also inhibit the transmission of sunlight in water bodies and affect the photosynthesis of water body organisms. In order to solve the above problems, scientists have developed many water treatment methods such as adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J27/06B01J35/10C02F1/30C02F101/38
CPCB01J31/26B01J27/06C02F1/30C02F2305/10C02F2101/308C02F2101/38B01J35/61B01J35/39
Inventor 王荣民张展程何玉凤王雪雪温明山
Owner NORTHWEST NORMAL UNIVERSITY
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