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Preparation method of BiOCl/Bi2WO6 composite material

A composite material and solution technology, which is applied in the preparation field of BiOCl/Bi2WO6 composite materials, can solve the problems of easy occurrence of recombination and reduced photocatalytic performance, and achieve the effects of short preparation period, high crystallinity and easy realization.

Active Publication Date: 2019-05-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with TiO 2 Different wide bandgap semiconductors represented by Bi 2 WO 6 It has a large band gap and can only be excited by external light or part of visible light. The visible light absorption range is 420-470nm, and photogenerated electron-hole pairs are prone to recombination, which reduces the photocatalytic performance of the material and cannot meet the expected requirements.

Method used

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  • Preparation method of BiOCl/Bi2WO6 composite material
  • Preparation method of BiOCl/Bi2WO6 composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Add analytically pure WCl 6 Add a volume ratio of isopropanol: triethanolamine: water = 1:0.5:0.1 mixed solvent to make 0.06mol / L solution A;

[0026] 2) Add analytically pure dodecylamine in solution A, so that dodecylamine and WCl 6 The ratio of the amount of substances is 0.5:1 to obtain solution B;

[0027] 3) Add analytically pure Bi(NO 3 )·5H 2 O, making Bi(NO 3 )·5H 2 O and WCl 6 The amount of the substance is 1:1, magnetically stirred for 30 minutes, and ultrasonically dispersed for 10 minutes to obtain a uniformly mixed solution C;

[0028] 4) Pour solution C into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 40%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 24 hours at 160°C;

[0029] 5) Cool to room temperature after the reaction, centrifuge the reactant with absolute ethanol, and dry the centrifuged product in a 50°C vacuum oven or freeze drying oven for 5 hours to obtain BiOCl / Bi 2 WO 6 com...

Embodiment 2

[0033] 1) Add analytically pure WCl 6 Add a volume ratio of isopropanol: triethanolamine: water = 1:0.8:0.2 mixed solvent to make a 0.05mol / L solution A;

[0034] 2) Add analytically pure dodecylamine in solution A, so that dodecylamine and WCl 6 The ratio of the amount of substances is 0.5:1 to obtain solution B;

[0035] 3) Add analytically pure Bi(NO 3 )·5H 2 O, making Bi(NO 3 )·5H 2O and WCl 6 The amount of the substance is 1.5:1, magnetically stirred for 30 minutes, and ultrasonically dispersed for 10 minutes to obtain a uniformly mixed solution C;

[0036] 4) Pour the solution C into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 60%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 30 hours at 140°C;

[0037] 5) Cool to room temperature after the reaction, centrifuge the reactant with absolute ethanol, and dry the centrifuged product in a 50°C vacuum oven or freeze drying oven for 5 hours to obtain BiOCl / Bi 2 WO...

Embodiment 3

[0039] 1) Add analytically pure WCl 6 Add a mixed solvent with a volume ratio of isopropanol: triethanolamine: water = 1:0.5:0.3 to make a solution A of 0.08mol / L;

[0040] 2) Add analytically pure dodecylamine in solution A, so that dodecylamine and WCl 6 The ratio of the amount of substances is 1:1 to obtain solution B;

[0041] 3) Add analytically pure Bi(NO 3 )·5H 2 O, making Bi(NO 3 )·5H 2 O and WCl 6 The amount of the substance is 2:1, magnetically stirred for 30 minutes, and ultrasonically dispersed for 5 minutes to obtain a uniformly mixed solution C;

[0042] 4) Pour the solution C into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 50%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 12 hours at 180°C;

[0043] 5) Cool to room temperature after the reaction, centrifuge the reactant with absolute ethanol, and dry the centrifuged product in a 50°C vacuum oven or freeze drying oven for 5 hours to obtain BiOCl / Bi...

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Abstract

The invention relates to a preparation method of a BiOCl / Bi2WO6 composite material, wherein analytical pure WCl6 is added to the mixed solvent of isopropanol, triethanolamine and water to obtain solution A; analytical pure dodecylamine is added to the solution A to obtain solution B; analytical pure Bi(NO3).5H2O is added to the solution B to obtain solution C; and the solution C is poured into a polytetrafluoroethylene-lined high pressure reactor, the reactor is sealed and placed into a homogeneous hydrothermal reactor for hydrothermal reaction. After the reaction is finished, the reactant iscooled to room temperature and is centrifugally washed with anhydrous ethanol, and the product obtained after centrifugal washing is dried to obtain BiOCl / Bi2WO6 composite material. The BiOCl / Bi2WO6 composite material is prepared by a one-step solvothermal method and has the advantages of low reaction temperature, mild condition, low energy consumption, easy realization, simple preparation process, low cost, easy process control, short preparation period and environmental friendliness. The prepared BiOCl / Bi2WO6 composite material has high crystallinity and excellent photocatalytic properties.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a BiOCl / Bi 2 WO 6 Methods of preparation of composite materials. Background technique [0002] Hydrogen as a clean energy is an ideal substitute for fossil fuels. With the increasing consumption of petrochemical raw materials, causing serious damage to the natural environment, it is the frontier direction of energy and chemical industry to find new hydrogen production technology to replace traditional production methods. In addition, the printing and dyeing industry is a major source of industrial wastewater, and the discharged printing and dyeing wastewater contains many toxic pollutants that are difficult to degrade. Most of the pollutants are based on aromatic hydrocarbons and heterocyclic compounds, and have chromogenic groups and polar groups. If the wastewater with complex components is directly discharged into lakes or rivers, it will cause serious pollutio...

Claims

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Application Information

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IPC IPC(8): B01J27/132B01J37/10B01J37/34
Inventor 黄剑锋海国娟冯亮亮曹丽云介燕妮杨佳付常乐吴建鹏
Owner SHAANXI UNIV OF SCI & TECH