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An Anion-Exchange Strategy to Bi₂S₃/Bi₂O₂(OH)(NO₃) Heterojunction with Efficient Visible Light Photoreactivity

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

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Shenghuan Su

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

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Qiaofeng Han

http://orcid.org/0000-0002-4020-7677

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

E-mail Address: hanqiaofeng@njust.edu.cn

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https://doi.org/10.1142/S1793292018500169Cited by:7 (Source: Crossref)

Abstract

As one of the basic bismuth nitrates, Bi₂O₂(OH)(NO₃) (denoted as BION) has been reported to exhibit powerful photodegradation activity for various contaminants. However, pure BION could only be irradiated by UV light due to broad bandgap ( $\sim$ 3.14eV). Herein, Bi₂S₃/Bi₂O₂(OH)(NO₃) (denoted as BS-BION) heterojunction was prepared by an in situ ion exchange reaction between BION and aqueous thiourea solution ( $pH \approx 3$ ). The resulting heterojunction possessed good visible light absorption and closely contacted interfaces, which benefited effective separation and transfer of photogenerated charges, thus leading to excellent photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation. Furthermore, the as-prepared heterojunction photocatalyst also presented high photochemical stability, which may be of great significance for practical application.

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