Oxygen vacancy-rich Z-scheme g-C3N4/BiOBr heterojunction with enhanced visible-light photocatalytic activity for pollutants degradation

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-05-05 DOI:10.1016/j.mseb.2025.118341

Yunping Kang , Xudong Leng , Xuekun Jin , Fengjuan Chen , Haiming Duan , Biaobing Cao

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Abstract

The g-C₃N₄/BiOBr photocatalysts riched with oxygen vacancy (g-C₃N₄/VoBiOBr) were constructed using a solvothermal method assisted by polyvinylpyrrolidone. The activity of g-C₃N₄/VoBiOBr was further explored by degrading Rhodamine B (RhB) and Congo red under light-emitting diode (LED) light. The g-C₃N₄/VoBiOBr (15 wt%) photocatalyst exhibited the highest photocatalytic degradation efficiency. Within 30 min of irradiation, the degradation rates of RhB and Congo red reached 93 % and 91 %, respectively. This was because the fact that oxygen vacancy is helpful to fast transfer of carriers, and further enhance reaction rates. Meanwhile, the heterojunction can also improve the separation efficiency. Hence, the synergistic effect of oxygen vacancy and the heterojunction can further improve the catalytic activity of BiOBr. The photocatalytic mechanism of Z-scheme heterojunctions was proposed on the basis of experiments and DFT theoretic calculations. This study provides valuable insights into the design of Z-scheme heterojunction photocatalysts for pollutant degradation.

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富氧空位Z-scheme g-C3N4/BiOBr异质结对污染物降解的可见光催化活性增强

以聚乙烯吡咯烷酮为辅助溶剂热法制备了富氧空位g-C3N4/BiOBr光催化剂（g-C3N4/ vobr）。通过在发光二极管（LED）下降解罗丹明B （RhB）和刚果红，进一步研究了g-C3N4/VoBiOBr的活性。g-C3N4/VoBiOBr （15 wt%）光催化剂表现出最高的光催化降解效率。辐照30 min内，RhB和刚果红的降解率分别达到93%和91%。这是因为氧空位有助于载体的快速转移，进一步提高反应速率。同时，异质结还可以提高分离效率。因此，氧空位与异质结的协同作用可以进一步提高BiOBr的催化活性。通过实验和DFT理论计算，提出了z型异质结的光催化机理。该研究为设计用于污染物降解的z型异质结光催化剂提供了有价值的见解。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.