A 0D/2D Bi4V2O11/g-C3N4 S-Scheme Heterojunction with Rapid Interfacial Charges Migration for Photocatalytic Antibiotic Degradation

Citation: Liang Zhou, Yunfeng Li, Yongkang Zhang, Liewei Qiu, Yan Xing. A 0D/2D Bi₄V₂O₁₁/g-C₃N₄ S-Scheme Heterojunction with Rapid Interfacial Charges Migration for Photocatalytic Antibiotic Degradation[J]. Acta Physico-Chimica Sinica, 2022, 38(7): 211202. doi: 10.3866/PKU.WHXB202112027 shu

具有高效界面电荷转移的0D/2D Bi₄V₂O₁₁/g-C₃N₄梯形异质结的设计合成及抗生素降解性能研究

周亮 ^1, ,
李云锋 ^{1,
,} ,
张永康 ^1, ,
秋列维 ^{1,
,} ,
邢艳 ^2,

1.
西安工程大学环境与化学工程学院，纺织化工助剂西安重点实验室，西安 710048
2.
东北师范大学化学学院，吉林省新能源材料重点实验室，长春 130024

通讯作者: 李云锋, liyf377@nenu.edu.cn
秋列维, 20190607@xpu.edu.cn

基金项目:
国家自然科学基金 22008185

国家自然科学基金 21872023

陕西省自然科学基础研究项目 2021JQ-669

西安工程大学大学生创新创业训练计划项目 202110709042

西安工程大学研究生创新基金 chx2021020

摘要: 随着工业技术的飞速发展，大量有机污染物被应用于生活的各个领域，由此带来了严重的环境问题。众所周知，半导体光催化技术是一种有效且环境友好的降解去除典型污染物的方法，而光催化剂在该技术的应用中起着关键作用。因此，在光催化污染物降解领域，人们已经尝试研究了各种半导体材料。其中石墨相氮化碳(g-C₃N₄)是近年来公认的“明星”材料之一。因其独特的二维层状结构和良好的可见光响应而引起了人们的极大兴趣。由于带隙较窄(~2.7 eV)、能带结构可调以及良好的物理化学稳定性，g-C₃N₄对太阳光谱的吸收可达450 nm，具有一定的可见光光催化性能。然而，g-C₃N₄在去除抗生素和染料方面的降解效率仍然存在不足，例如光生电荷的快速复合以及空穴的氧化能力弱等。为了优化这种有前景的光催化材料，人们尝试了多种方法来改善g-C₃N₄的电子能带结构，例如金属/非金属元素掺杂、形貌调控和官能团修饰等。最近，人们提出了由两种N型半导体光催化剂组成的梯形异质结理念，它可以利用半导体材料更正的价带和更负的导带。相关结果表明，构筑梯形异质结是提高g-C₃N₄光催化活性的最有效方法之一。因此，本文通过简单的原位溶剂热生长法制备了新型0D/2D Bi₄V₂O₁₁/g-C₃N₄梯形异质结光催化剂。Bi₄V₂O₁₁/g-C₃N₄复合材料对去除土霉素(OTC)和活性红染料展示出了优异的光催化活性。尤其是BVCN-50复合材料对OTC和活性红的降解效率高达74.1%和84.2%，该过程的主要活性物种为·O₂^-。大幅增强的光催化性能归因于Bi₄V₂O₁₁和g-C₃N₄之间形成的梯形异质结保持了光催化体系的强氧化还原能力(Bi₄V₂O₁₁的强氧化能力和g-C₃N₄的强还原能力)，并促进了光生电荷的空间分离。此外，金属Bi⁰的表面等离子共振效应可以拓宽异质结系统的光吸收范围。此外，基于高效液相色谱-质谱联用(LC-MS)分析，我们研究了OTC降解过程中可能的中间体和降解路径。这项工作为设计和制备g-C₃N₄基梯形异质结用于抗生素和活性染料降解提供了一种新的策略。

关键词:

English

A 0D/2D Bi₄V₂O₁₁/g-C₃N₄ S-Scheme Heterojunction with Rapid Interfacial Charges Migration for Photocatalytic Antibiotic Degradation

Liang Zhou ^1, ,
Yunfeng Li ^{1,
,} ,
Yongkang Zhang ^1, ,
Liewei Qiu ^{1,
,} ,
Yan Xing ^2,

1.
College of Environmental and Chemical Engineering, Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, Xi'an Polytechnic University, Xi'an 710048, China
2.
Jilin Provincial Key Laboratory of Advanced Energy Materials, Department of Chemistry, Northeast Normal University, Changchun 130024, China

Corresponding author: Yunfeng Li, liyf377@nenu.edu.cn Liewei Qiu, 20190607@xpu.edu.cn

Received Date: 20 December 2021
Accepted Date: 17 January 2022
Revised Date: 09 January 2022
Available Online: 15 July 2022
Fund Project:

Abstract: With the rapid development of industrial technology, a large number of organic pollutants are routinely released into the environment, which has caused serious problems. Semiconductor photocatalysis is an environmentally-friendly and effective method to degrade and remove typical pollutants, and photocatalysts play a key role in the application of this technology. Therefore, various semiconductor materials have been tried and used in the field of pollutant removal. Graphite carbon nitride (g-C₃N₄) has attracted great interest because of its two-dimensional layered structure and good visible light response range. Owing to a narrow bandgap, adjustable band structure, and high physicochemical stability, g-C₃N₄ absorbs wavelengths up to 450 nm in the visible spectrum, leading to an opportunity for visible-light photocatalytic performance. Nevertheless, there are still some drawbacks that limit the photocatalytic efficiency of g-C₃N₄ in the removal of antibiotics and dyes under visible light, such as the rapid recombination of photoinduced charges and the weak oxidation capacity of holes. To advance this promising photocatalytic material, multiple methods have been tried to optimize the electronic band structure of g-C₃N₄, such as doping with various elements, morphology control, and functional group modification. Recently, a novel type of Step-scheme (S-scheme) heterojunction composed of two n-type semiconductor photocatalysts has been proposed, which can utilize a more positive valance band and a more negative conduction band. It was demonstrated that the formation of S-scheme heterojunctions is a valid way to increase photocatalytic activity of g-C₃N₄. Herein, novel 0D/2D Bi₄V₂O₁₁/g-C₃N₄ S-scheme heterojunctions were prepared by a simple in situ solvothermal growth method. The Bi₄V₂O₁₁/g-C₃N₄ composites displayed a high photocatalytic activity through the removal of oxytetracycline (OTC) and Reactive Red 2. In particular, the BVCN-50 composite showed the highest degradation efficiency for OTC of 74.1% and for Reactive Red 2 of 84.2% with ·O₂^- as the primary active species. This highly improved photocatalytic performance can be ascribed to the generation of S-scheme heterojunctions, which provides for a high redox capacity of the heterojunction system (strong oxidative ability of Bi₄V₂O₁₁ and strong reductive capacity of g-C₃N₄) and facilitates the space separation of photo-generated charges. Moreover, the surface plasmon resonance effect of metallic Bi⁰ broadens the light utilization range of the heterojunction system. In addition, the possible degradation pathway and intermediates throughout the degradation process of OTC based on liquid chromatograph mass spectrometer (LC-MS) analysis were also studied. This work provides a novel tactic for the design and fabrication of g-C₃N₄-based S-scheme heterojunctions with enhanced photocatalytic performance.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

具有高效界面电荷转移的0D/2D Bi₄V₂O₁₁/g-C₃N₄梯形异质结的设计合成及抗生素降解性能研究

通讯作者: 李云锋, liyf377@nenu.edu.cn
秋列维, 20190607@xpu.edu.cn

English

A 0D/2D Bi₄V₂O₁₁/g-C₃N₄ S-Scheme Heterojunction with Rapid Interfacial Charges Migration for Photocatalytic Antibiotic Degradation

Corresponding author: Yunfeng Li, liyf377@nenu.edu.cn Liewei Qiu, 20190607@xpu.edu.cn

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具有高效界面电荷转移的0D/2D Bi4V2O11/g-C3N4梯形异质结的设计合成及抗生素降解性能研究

通讯作者: 李云锋, liyf377@nenu.edu.cn 秋列维, 20190607@xpu.edu.cn

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