Bismuth oxychlorobromide (010)/graphene heterojunction, and preparation method and application thereof

A kind of technology of bismuth oxychlorobromide and bismuth oxybromide, applied in the field of bismuth oxychlorobromide/graphene heterojunction and preparation thereof, can solve the problem that no report, no patent and literature report bismuth oxychlorobromide (010)/graphite The preparation method and application of ene heterojunction, etc., to achieve the effects of low cost, improved photocatalytic performance, and easy size

Inactive Publication Date: 2018-03-23
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, the work on the preparation method of bismuth oxybromide (010) / graphene composite has not been reported, and there are no patents and literature reports on bismuth oxybromide (010) / graphene heterojunction and its preparation method and application

Method used

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  • Bismuth oxychlorobromide (010)/graphene heterojunction, and preparation method and application thereof
  • Bismuth oxychlorobromide (010)/graphene heterojunction, and preparation method and application thereof
  • Bismuth oxychlorobromide (010)/graphene heterojunction, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1, take 0.050g of commercial graphene and add it into deionized water, ultrasonically disperse at 30°C for 15min, the ultrasonic power is 65W, and then continue to stir for 35min to make A liquid;

[0038] Step 2, 5mmol of Bi(NO 3 ) 3 ·5H 2 O was added to 2.0 mol / L HNO 3 , stirred at 70°C until completely dissolved, and the stirring time was 60 minutes, and made into liquid B;

[0039] Step 3, take 4.95mmol KBr and 0.05mmol KCl and dissolve in deionized water to make C solution, wherein Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to (KBr+KCl) is 1:1;

[0040] Step 4: Slowly add the prepared liquid A to liquid B dropwise at a rate of 14 drops / min, and stir while adding. After the dropwise addition, ultrasonically disperse at 30°C with a power of 65W for 20 minutes, and then stir for 30 minutes. into D liquid;

[0041] Step 5, slowly drop 2.0 mol / L NaOH solution into D liquid at a rate of 14 drops / min, adjust the pH value of D liquid to 6, and continue stirring fo...

Embodiment 2

[0046] Step 1: Add 0.055g of commercial graphene into deionized water, ultrasonically disperse at 35°C for 20min, the ultrasonic power is 70W, and then continue to stir for 40min to make A solution;

[0047] Step 2, 5mmol of Bi(NO 3 ) 3 ·5H 2 O was added to 2.5 mol / L HNO 3 , stirred at 75°C until completely dissolved, and the stirring time was 65 minutes, and made into liquid B;

[0048] Step 3, take 4.90mmol KBr and 0.10mmol KCl and dissolve in deionized water to make C solution, wherein Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to (KBr+KCl) is 1:1;

[0049] Step 4: Slowly add the prepared liquid A to liquid B dropwise at a rate of 12 drops / min. Stir while adding. After the dropwise addition, ultrasonically disperse at 35°C with a power of 70W for 20 minutes, and then stir for 35 minutes. into D liquid;

[0050] Step 5, slowly drop 2.5 mol / L NaOH solution into D liquid at a rate of 12 drops / min, adjust the pH value of D liquid to 6, and continue stirring for 25 min;

[...

Embodiment 3

[0055] Step 1, take 0.060g of commercial graphene and add it into deionized water, ultrasonically disperse at 40°C for 20min, the ultrasonic power is 75W, and then continue to stir for 45min to make A liquid;

[0056] Step 2, 5mmol of Bi(NO 3 ) 3 ·5H 2 O was added to 3.0 mol / L HNO 3 , stirred at 80°C until completely dissolved, and the stirring time was 70 minutes, and made into B liquid;

[0057] Step 3, take 4.85mmolKBr and 0.15mmol KCl and dissolve in deionized water, and make C solution, wherein Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to (KBr+KCl) is 1:1;

[0058] Step 4: Slowly add the prepared liquid A to liquid B dropwise at a rate of 10 drops / min. Stir while adding. After the dropwise addition, ultrasonically disperse at 40°C with a power of 75W for 25 minutes, and then stir for 40 minutes. into D liquid;

[0059] Step 5, slowly drop 2.5 mol / L NaOH solution into D liquid at a rate of 10 drops / min, adjust the pH value of D liquid to 6, and continue stirring for 2...

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Abstract

The invention discloses a bismuth oxychlorobromide (010)/graphene heterojunction and a preparation method and an application thereof. The invention aims to solve the problems of easy dissociation, poor light absorption performance and low photocatalytic efficiency of existing bismuth oxybromide (001). The preparation method comprises the following steps: mixing graphene with a bismuth oxychlorobromide (010) precursor solution, and performing a hydrothermal technology to generate bismuth oxychlorobromide (010)/graphene powder characterized by compounding the (010) surface of the bismuth oxychlorobromide with the graphene. A heterojunction structure is formed between the graphene and the (010) crystal face of the bismuth oxychlorobromide after the compounding, and the energy levels of the graphene and the bismuth oxychlorobromide are matched, so the promotion of the effective separation of photogenerated electrons and holes is facilitated, the light response range of the bismuth oxychlorobromide (010) is widened, and the separation efficiency of the photogenerated electrons and the holes is improved, thereby the photocatalytic performances of the bismuth oxychlorobromide (010) is improved.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a bismuth (010) / graphene heterojunction and a preparation method and application thereof. Background technique [0002] Bismuth oxybromide (BiOBr) is a photocatalyst with visible light photoactivity, the crystal structure is PbFCl type, D 4h Axisymmetric, P4 / nmm space group, belonging to the tetragonal crystal system. Its lattice parameters are: a=3.92Å, b=3.92Å, c=8.10Å, and the band gap of bismuth oxybromide is about 2.72eV. Bi 3+ O around 2- and x - In anti-tetragonal column coordination, Br - The layer is a square coordination, and the next layer is a square O 2- Layer, Br - Layer and O 2- The layers are staggered by 45°, and the middle sandwich layer is Bi 3+ . However, the (010) surface of bismuth oxybromide also has problems such as low separation efficiency of photogenerated electron-hole pairs, which leads to a decrease in its photocatalytic activity. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06A62D3/17A62D101/20
CPCA62D3/17A62D2101/20B01J27/06B01J35/004B01J37/10
Inventor 单连伟毕净净吴泽
Owner HARBIN UNIV OF SCI & TECH
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