Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 587, Issue -, Pages 820-830Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.11.043
Keywords
Bi2O2CO3/BiOBr; Z-scheme; Tetracycline; Ciprofloxacin; Degradation
Categories
Funding
- National Natural Science Foundation of China [21571112, 51772162]
- Taishan Scholar Foundation
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Precisely engineering the morphology and regulating the hybrid interface of each component in a heterojunction are crucial for enhancing charge carrier separation. The Z-scheme heterojunction of flower-like bismuth oxycarbonate/bismuth oxybromide prepared in this study exhibited a high photocatalytic activity, attributed to the hybrid mode of BOC and BiOBr, and the Z scheme electron transfer path and oxygen vacancies present in BOC/BiOBr.
Finely engineering the morphology and regulating the hybrid interface of each component in a heterojunction are important for facilitating charge carrier separation. In this study, a flower-like bismuth oxycarbonate/bismuth oxybromide (Bi2O2CO3/BiOBr, BOC/BiOBr) Z-scheme heterojunction was prepared via generation of BOC followed by in situ self-growth of BiOBr on just generated BOC. The obtained photocatalyst has an interlaced nanosheet structure with oxygen vacancies, which enhances light adsorption and facilitates the migration and separation of charge carriers. The highest apparent rate constants (k) in the degradation of tetracycline and ciprofloxacin using the BOC/BiOBr-2 photocatalyst under visible-light irradiation were 0.0282 and 0.0220 min(-1), respectively; these values were 6.1 and 6.2 times, respectively higher than that achieved using BOC as a photocatalyst. The hybrid mode of BOC and BiOBr, and the Z scheme electron transfer path and oxygen vacancies present in BOC/BiOBr are the factors responsible for its high photocatalytic activity. (c) 2020 Elsevier Inc. All rights reserved.
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