Facile construction of flower-like bismuth oxybromide/bismuth oxide formate p-n heterojunctions with significantly enhanced photocatalytic performance under visible light

• Published in: Journal of colloid and interface science Vol. 548; pp. 12 - 19
• Main Authors: Li, Shijie, Chen, Jialin, Jiang, Wei, Liu, Yanping, Ge, Yaming, Liu, Jianshe
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.07.2019
• Subjects: Anion exchange; BiOBr/BiOCOOH; p-n Heterojunction; Photocatalysis; Visible light; Anion exchange; Visible light; Photocatalysis; BiOBr/BiOCOOH; p-n Heterojunction
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2019.04.024

[Display omitted] Visible-light harvesting ability and charge separation efficiency are two pivotal factors for the design and construction of photocatalysts with an efficient ability for degrading toxic pollutants. Herein, visible-light-driven (VLD) BiOBr/BiOCOOH p-n heterojunction photocatalysts were prepared via an in-situ anion-exchange route. Through controlling the addition of KBr, we synthesized a series of BiOBr/BiOCOOH p-n heterojunctions with a different BiOBr loading. During the process, BiOBr production and homogeneous deposition on BiOCOOH with close interfacial interactions were realized by employing BiOCOOH microspheres as the self-sacrificing template. Compared to bare BiOBr and BiOCOOH, such p-n heterojunctions displayed dramatically strengthened performance in decomposing the industrial dye (rhodamine B, RhB) and antibiotic (tetracycline chloride, TC) under the irradiation of visible light. Among them, BiOBr/BiOCOOH p-n heterojunction with a BiOBr/BiOCOOH theoretical molar ratio of 0.6/0.4 (0.6Br-Bi) achieved the highest performance. Moreover, 0.6Br-Bi showed a good durability, indicating BiOBr/BiOCOOH p-n heterojunction possessed an excellently stable photocatalytic activity. Such an efficient and stable photocatalytic performance was mainly due to the formation of p-n heterojunctions which can profoundly improve the visible-light absorption and significantly depress the recombination of charge carriers. Trapping experiments and ESR tests verified that superoxide free radicals (O2−) and photogenerated hole (h+) played a significant role in RhB degradation. This research affords a promising p-n heterojunction catalyst for wastewater treatment.