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A bi-modified biobr-g-c 3 n 4 Heterojunction photocatalyst and preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalysis, can solve the problem of insufficient absorption of visible light and achieve the effect of reducing the band gap

Active Publication Date: 2022-07-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] build g-C 3 N 4 Although the / BiOBr heterojunction can effectively reduce the recombination of electron-hole pairs and improve the visible light photocatalytic activity of BiOBr, its improvement in the band gap of BiOBr is limited (BiOBr band gap: 2.98eV, g-C 3 N 4 / BiOBr band gap: 2.76eV ~ 2.92eV), insufficient absorption of visible light, the visible light photocatalytic efficiency of BiOBr still needs to be further improved

Method used

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  • A bi-modified biobr-g-c <sub>3</sub> n <sub>4</sub> Heterojunction photocatalyst and preparation method and application thereof
  • A bi-modified biobr-g-c <sub>3</sub> n <sub>4</sub> Heterojunction photocatalyst and preparation method and application thereof
  • A bi-modified biobr-g-c <sub>3</sub> n <sub>4</sub> Heterojunction photocatalyst and preparation method and application thereof

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Embodiment 1

[0076] This embodiment provides a Bi-modified BiOBr-g-C 3 N 4 A heterojunction photocatalyst, the preparation method of which comprises the following steps:

[0077] S1. Preparation of g-C 3 N 4

[0078] After weighing 10g of urea into a ceramic crucible with a lid, place the crucible in a muffle furnace, heat it up to 350°C at a heating rate of 5°C / min, perform calcination once, and keep it for 1 hour; then heat at a temperature of 5°C / min The rate of heating was increased to 550°C, followed by secondary calcination for 3h; cooled to room temperature (25-30°C), ground into powder, washed with water and ethanol respectively, and finally placed in an oven and dried at 60°C for 36h to obtain porous g-C 3 N 4 ;

[0079]S2. Preparation of Bi-modified BiOBr-g-C 3 N 4 Heterojunction Photocatalyst

[0080] S21. g-C prepared from S1 3 N 4 0.2g, 1mmol Bi(NO3) 3 and 0.3g of PVP were dissolved in a beaker containing 20mL of ethylene glycol (EG) to obtain solution A;

[0081...

Embodiment 2

[0084] This embodiment provides a Bi-modified BiOBr-g-C 3 N 4 The difference between the heterojunction photocatalyst and Example 1 is that the amount of citric acid added in step S22 is 2 mmol, and the final prepared Bi-modified BiOBr-g-C 3 N 4 Heterojunction photocatalyst, denoted BBC-2, where Bi, BiOBr and g-C 3 N 4 The mass ratio of 0.27:1.14:1.

Embodiment 3

[0086] This embodiment provides a Bi-modified BiOBr-g-C 3 N 4 The difference between the heterojunction photocatalyst and Example 1 is that the amount of citric acid added in step S22 is 3 mmol, and the Bi-modified BiOBr-g-C prepared finally 3 N 4 Heterojunction photocatalyst, denoted as BBC-3, where Bi, BiOBr and g-C 3 N 4 The mass ratio of 0.41:1:1.

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Abstract

The present invention relates to a Bi-modified BiOBr-g-C 3 N 4 Heterojunction photocatalyst and preparation method and application thereof. Bi-modified BiOBr-g-C of the present invention 3 N 4 Heterojunction photocatalysts modified by BiBiOBr and g‑C 3 N 4 Among them, Bi-modified BiOBr includes a spherical structure composed of BiOBr nanosheets and a simple substance of Bi modified on the surface of BiOBr nanosheets; among them, Bi, BiOBr and g‑C 3 N 4 The mass ratio is 0.01~2.1:0.4~7.2:1. Bi-modified BiOBr-g-C prepared by the present invention 3 N 4 The heterojunction photocatalyst can achieve a photocatalytic degradation rate of RhB as high as 99.8% under visible light irradiation, which is 41.16% higher than that of BiOBr, and comparable to BiOBr‑g‑C 3 N 4 23.21% higher than that; the reaction rate constant for RhB can be as high as 0.097 / min, which is 16.44 times that of BiOBr and 16.44 times that of BiOBr‑g‑C 3 N 4 3.73 times.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a Bi-modified BiOBr-g-C 3 N 4 Heterojunction photocatalyst and preparation method and application thereof. Background technique [0002] In recent years, bismuth oxybromide (BiOBr) has received extensive attention in the research and development of visible light-responsive photocatalysts due to its favorable price, nontoxicity, and excellent optical activity. BiOBr is a tetragonal layered structure, and its crystal form is PbFCl type, [Bi 2 O 2 ] 2+ Layer and Double Br - The internal electric field formed by the ion layer, this unique layered structure can improve the separation efficiency of photogenerated electrons and holes, thereby enhancing the photocatalytic activity of BiOBr. However, the forbidden band width of BiOBr is about 2.64 eV ~ 2.91 eV, the utilization rate of visible light is low, and its visible light catalytic activity is weak. [0003] In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/38
CPCB01J27/24C02F1/30C02F2305/10C02F2101/308C02F2101/38C02F2101/30B01J35/39
Inventor 李冬梅黄毅梁奕聪邓玥曾庆洋尤炜弘谢震宇陈海强陈锦妹林志奇陈志炫李俊添杨思睿方文钦陈梓浩
Owner GUANGDONG UNIV OF TECH
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