期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 548, 期 -, 页码 12-19出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.04.024
关键词
BiOBr/BiOCOOH; p-n Heterojunction; Anion exchange; Photocatalysis; Visible light
资金
- National Natural Science Foundation of China [51708504]
- Public Projects of Zhejiang Province [LGN18E080003]
- Zhejiang Provincial Natural Science Foundation of China [LQ17C030001]
- Science and Technology Project of Zhoushan [2017C41006]
- Key Subject Open Fund of Zhejiang Province [20140205]
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 (O-2(-)) and photogenerated hole (h(+)) played a significant role in RhB degradation. This research affords a promising p-n heterojunction catalyst for wastewater treatment. (C) 2019 Elsevier Inc. All rights reserved.
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