CN-117339608-B - Plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material and preparation method and application thereof

Abstract

The invention discloses a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material and a preparation method and application thereof, wherein the preparation method of the material comprises the following steps: and (3) dissolving bromine salt in 1, 2-propylene glycol to obtain a dispersion liquid, adding bismuth salt into the dispersion liquid, uniformly mixing to obtain a reaction liquid, carrying out hydrothermal reaction on the reaction liquid, and cooling, separating, washing and drying a material obtained by the reaction to obtain a target product. The invention uses 1, 2-propylene glycol as solvent and plays a role of reducer, and plasma metal Bi and oxygen vacancy are simultaneously introduced into BiOBr through hydrothermal reaction so as to improve the catalytic performance. In addition, the formation of plasma metal Bi and oxygen vacancies can be further promoted after lignin is added into the reaction system. The material prepared by the invention can be used for oxidizing and reducing 2, 4-dichlorophenol in water and reducing CO 2 , can effectively restore the environment, realizes energy conversion and has good application prospect.

Inventors

• TIAN QINGWEN
• LI HONGBIN
• LIANG FANGMIN
• LIN YAN
• LIANG LONG
• ZHU BEIPING
• WU TING
• HUANG CHEN
• YIN HANG
• SU CHEN
• YANG CHENG
• YANG QIANG
• MA WENCAN
• LV YAN
• ZHOU XUELIAN
• GENG BO
• FANG GUIGAN
• LI XIANG
• PAN AIXIANG
• DENG YONGJUN
• SHEN KUIZHONG
• HAN SHANMING
• JIAO JIAN

Assignees

• 中国林业科学研究院林产化学工业研究所

Dates

Publication Date

20260505

Application Date

20230926

Claims (7)

1. 1. Dissolving bromine salt in 1, 2-propylene glycol to obtain dispersion liquid, adding bismuth salt into the dispersion liquid, uniformly mixing to obtain reaction liquid, transferring the reaction liquid into a reaction kettle to perform hydrothermal reaction after the reaction liquid is uniformly mixed, and cooling, separating, washing and drying the material obtained by the reaction to obtain the plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material; Lignin is also added into the dispersion liquid, and the addition amount of the lignin is 1-10 wt% of the mass of BiOBr; the atomic mole ratio of bismuth to bromine in the bismuth salt to the bromine salt is 1:1; the temperature of the hydrothermal reaction is 120-160 ℃ and the time is 6-18 h.
2. 2. The method for preparing a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material according to claim 1, wherein the lignin is alkali lignin or lignin sulfonate.
3. 3. The method for preparing a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material according to claim 1, wherein the bromine salt is potassium bromide or sodium bromide.
4. 4. The method for preparing a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material according to claim 1, wherein the bismuth salt is bismuth nitrate, bismuth sulfate or bismuth chloride.
5. 5. A plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material, which is prepared by the preparation method according to any one of claims 1 to 4.
6. 6. The plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material of claim 5 for the catalytic degradation of contaminants in wastewater, wherein said contaminants in wastewater comprise 2, 4-dichlorophenol.
7. 7. The plasma metal Bi/oxygen vacancy-bio br photocatalytic material of claim 5 for reduction of carbon dioxide.

Description

Plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material and preparation method and application thereof Technical Field The invention belongs to the field of photocatalysis, and particularly relates to a plasma metal Bi/oxygen vacancy-BiOBr photocatalysis material, and a preparation method and application thereof. Background Due to human activity and the use of fossil fuels, the carbon dioxide content in air has risen dramatically for decades, resulting in global warming, glacier melting, rising ocean levels, greenhouse effects, etc. The urgent need is to find a viable strategy to contain the rapid growth of carbon dioxide. The photocatalytic reduction of CO 2 with water vapor to hydrocarbon fuels has become a promising approach to alleviate the global warming and energy shortage problems. Unfortunately, however, the high dissociation energy of the c=o bond (750 KJ mol-1) constitutes a great thermodynamic barrier to the activation and reduction of CO 2. While many semiconductor materials have proven useful for carbon dioxide photoreduction, the development of semiconductors as potential photocatalysts is still inherently affected by the collection and utilization limitations of light. Therefore, there is a need to develop new alternative materials or intelligent strategies to avoid the drawbacks of semiconductor photocatalysts. The development of industry also causes great damage to the aquatic environment. Chlorophenols (CPs) are organic pollutants with the characteristics of high toxicity, carcinogenicity, teratogenicity, poor biodegradability and the like. Among them, 2, 4-dichlorophenol (2, 4-DCP) is widely used in industries such as pesticides, herbicides, dyes, pulp and paper, and has been classified as one of the important pollutants in many countries due to its high mutability, carcinogenicity, and adverse effects on human bodies. Therefore, there is a need to develop an environmentally friendly process to achieve both efficient degradation of 2, 4-dichlorophenol and reduction of CO 2. Photocatalysis is used as a green pollution-free advanced oxidation technology, and solar energy is utilized to realize effective degradation of pollutants. Under the irradiation of visible light, the photo-generated electrons are transited from a conduction band to a valence band after the catalyst absorbs energy, so that free radicals with strong oxidizing property, such as hydroxyl (OH), superoxide (O 2-) free radicals and holes (h +), are generated, and organic pollutants can be oxidized without secondary pollution. BiOBr has a plurality of active sites and high carrier separation efficiency due to a unique laminar structure formed by interlacing a [ Bi 2O2]2+ plate and a dibromo atom plate, and is widely applied to the field of photocatalysis. However, pure BiOBr has weak collection ability for visible light and large band gap energy, and the photocatalytic effect is not ideal in practical application, and the catalytic effect is generally enhanced by modifying the catalyst. Numerous studies have shown that the deposition of plasmonic metal Bi and the generation of Oxygen Vacancies (OVs) play an important role in enhancing the catalytic performance of photocatalyst. The simple substance Bi can enhance the absorption of the catalyst to visible light through the plasma effect and accelerate the separation efficiency of photogenerated carriers so as to improve the catalytic performance. Whereas OVs can enhance the enrichment capability for visible light by introducing defects at the conduction band or valence band edge to reduce the band gap. In addition, OVs can act as capture sites, impeding recombination of photogenerated carriers, enhancing transfer of excited electrons to surface sites, thereby generating more reactive oxygen groups. How to simultaneously introduce plasma metal Bi and oxygen vacancies in BiOBr to improve the catalytic performance is a technical problem to be solved. Disclosure of Invention The invention aims to provide a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material as well as a preparation method and application thereof, so as to solve the problem of non-ideal BiOBr catalytic performance in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: The first object of the invention is to provide a preparation method of a plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material, which comprises the following steps of dissolving bromine salt in 1, 2-propylene glycol to obtain a dispersion liquid, adding bismuth salt into the dispersion liquid, uniformly mixing to obtain a reaction liquid, transferring the reaction liquid into a reaction kettle to carry out hydrothermal reaction at 120-200 ℃ for 6-18 h after uniformly mixing, and cooling, separating, washing and drying the material obtained by the reaction to obtain the plasma metal Bi/oxygen vacancy-BiOBr photocatalytic material. As a preferable technical scheme, lignin is al