Self-Assembly of Bi(2)Sn(2)O(7)/β-Bi(2)O(3) S-Scheme Heterostructures for Efficient Visible-Light-Driven Photocatalytic Degradation of Tetracycline

[Image: see text] Fabrication of S-scheme heterojunctions with enhanced redox capability offers an effective approach to address environmental remediation. In this study, high-performance Bi(2)Sn(2)O(7)/β-Bi(2)O(3) S-scheme heterojunction photocatalysts were fabricated via the in situ growth of Bi(2)Sn(2)O(7) on β-Bi(2)O(3) microspheres. The optimized Bi(2)Sn(2)O(7)/β-Bi(2)O(3) (BSO/BO-0.4) degradation efficiency for tetracycline hydrochloride was 95.5%, which was 2.68-fold higher than that of β-Bi(2)O(3). This improvement originated from higher photoelectron–hole pair separation efficiency, more exposed active sites, excellent redox capacity, and efficient generation of (·)O(2)(–) and (·)OH. Additionally, Bi(2)Sn(2)O(7)/β-Bi(2)O(3) exhibited good stability against photocatalytic degradation, and the degradation efficiency remained >89.7% after five cycles. The photocatalytic mechanism of Bi(2)Sn(2)O(7)/β-Bi(2)O(3) S-scheme heterojunctions was elucidated. In this study, we design and fabricate high-performance heterojunction photocatalysts for environmental remediation using S-scheme photocatalysts.