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Bi-modified BiOBr-g-C3N4 heterojunction photocatalyst as well as 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: 2021-07-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, it has limited improvement in the band gap of BiOBr (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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  • Bi-modified BiOBr-g-C3N4 heterojunction photocatalyst as well as preparation method and application thereof
  • Bi-modified BiOBr-g-C3N4 heterojunction photocatalyst as well as preparation method and application thereof
  • Bi-modified BiOBr-g-C3N4 heterojunction photocatalyst as well as preparation method and application thereof

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Embodiment 1

[0076] This embodiment provides a Bi modified BiOBr-g-C 3 N 4 Heterojunction photocatalyst, its preparation method comprises the steps:

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

[0078] Weigh 10g of urea into a ceramic crucible with a cover, place the crucible in a muffle furnace, raise the temperature to 350°C at a heating rate of 5°C / min, perform a calcination, and keep it for 1h; then heat up at a rate of 5°C / min Raise the temperature to 550°C, perform secondary calcination, and keep for 3 hours; cool to room temperature (25-30°C), grind into powder, wash with water and ethanol respectively, and finally put it in an oven and dry at 60°C for 36 hours to obtain porous g-C 3 N 4 ;

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

[0080] S21. g-C prepared from S1 3 N 4 0.2g, 1mmol Bi(NO3) 3 And 0.3g PVP is dissolved in the beaker that 20mL ethylene glycol (EG) is housed, obtains solution A;

[0081] S22. Dissolving 1mmol KBr and 1m...

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 Bi-modified BiOBr-g-C prepared finally 3 N 4 Heterojunction photocatalyst, denoted as BBC-2, where Bi, BiOBr and g-C 3 N 4 The mass ratio is 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 is 0.41:1:1.

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Abstract

The invention relates to a Bi modified BiOBr-g-C3N4 heterojunction photocatalyst as well as a preparation method and application thereof. The Bi modified BiOBr-g-C3N4 heterojunction photocatalyst disclosed by the invention is formed by compounding a Bi modified BiOBr sheet layer and a g-C3N4 sheet layer, wherein the Bi modified BiOBr comprises a spherical structure formed by BiOBr nanosheets and a Bi elementary substance modifying the surfaces of the BiOBr nanosheets, and the mass ratio of the Bi to the BiOBr to the g-C3N4 is (0.01-2.1): (0.4-7.2): 1. According to the Bi modified BiOBr-g-C3N4 heterojunction photocatalyst prepared by the preparation method disclosed by the invention, under the irradiation of visible light, the photocatalytic degradation rate of RhB can be up to 99.8%, which is improved by 41.16% compared with that of BiOBr, and is improved by 23.21% compared with that of BiOBr-g-C3N4, and the reaction rate constant to RhB can be up to 0.097 / min, which is 16.44 times that of BiOBr, and is 3.73 times that of BiOBr-g-C3N4.

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 its preparation method and application. Background technique [0002] In recent years, bismuth oxybromide (BiOBr) has attracted extensive attention in the research and development of visible light-responsive photocatalysts due to its favorable price, non-toxicity and excellent optical activity. BiOBr has a tetragonal layered structure, and its crystal form is PbFCl type, [BiOBr 2 o 2 ] 2+ layers and double Br - The internal electric field formed by the ionic 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 2.64eV-2.91eV, 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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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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