局域表面等离子体共振构建Bi@Bi_(4)O_(5)Br_(2)用于降解四环素  

Local Surface Plasmon Resonance Constructing Bi@Bi_(4)O_(5)Br_(2)for Degradation of Tetracycline

作　　者：陈主婷 唐成东 史浪 CHEN Zhuting;TANG Chengdong;SHI Lang(School of Chemistry and Chemical Engineering,University of South China,Hengyang,Hunan 421001,China)

机构地区：[1]南华大学化学化工学院,湖南衡阳421001

出　　处：《南华大学学报(自然科学版)》2024年第6期78-85,共8页Journal of University of South China:Science and Technology

摘　　要：提出了一种简便的原位还原氧化法制备新型核壳复合材料Bi@Bi_(4)O_(5)Br_(2),并通过降解四环素研究了其在可见光下的光催化性能。结果表明,在氙灯照射90 min后,基于Bi@Bi_(4)O_(5)Br_(2)的四环素(tetracycline,TC)去除率可达83.0%。该复合材料在LED灯(3000 k、6000 k)下也表现出很强的光催化性能,去除率分别达到55.0%和66.0%。光催化性能的增强可归因于将富铋策略和铋纳米粒子的局域表面等离子体共振(local surface plasmon resonance,LSPR)特性相结合的合理结构设计。这种核壳结构避免了Bi纳米粒子占据Bi_(4)O_(5)Br_(2)的表面活性位点,并从另一个方向增加了复合材料的表面活性位点。此外,还通过X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)和X射线衍射(X-ray diffractometer,XRD)表征验证了Bi@Bi_(4)O_(5)Br_(2)的结构,并讨论了可能的形成机制。随后,通过自由基捕获实验确定了光催化过程中的主要活性物种,并阐明了可能的光催化机理。A facile in situ reduction and oxidation method is reported for the preparation of a novel core-shell composite Bi@Bi_(4)O_(5)Br_(2),and its photocatalytic performance under visible light is investigated by degrading tetracycline(TC).The results show that the removal rate of TC based on Bi@Bi_(4)O_(5)Br_(2)can reach 83.0%after 90 min of xenon lamp irradiation.The composite also exhibits strong photocatalytic performance under LED lamps(3000 k,6000 k),with removal rates reaching 55.0%and 66.0%,respectively.The enhanced photocatalytic performance can be attributed to the rational structural design integrating the Bi-rich strategy and the Local surface plasmon resonance(LSPR)properties of Bi nanoparticles.This core-shell structure avoids the occupation of Bi_(4)O_(5)Br_(2)surface active sites by Bi nanoparticles and increases the surface active sites of the composite from the other direction.In addition,the structure of Bi@Bi_(4)O_(5)Br_(2)was verified by X-ray photoelectron spectroscopy(XPS)and X-Ray Diffractometer(XRD)characterization,and the possible formation mechanism was discussed.Subsequently,the main active species in the photocatalytic process were identified by radical trapping experiments and the possible photocatalytic mechanism was elucidated.

关 键 词：局域表面等离子体共振 Bi@Bi_(4)O_(5)Br_(2) 四环素 

分 类 号：O643.36[理学—物理化学]