Novel discrete architecture for quantum dots modified ultrathin hollow nanotube Bi2Sn2O7/Bi4O5I2 S-scheme heterojunction for ultra-efficient photocatalytic degradation of bisphenol A

Abstract

Designing and constructing novel discrete architecture for quantum dots modified ultrathin hollow nanotube BiSnO/BiOI S-scheme heterojunctions for the first time in this work is an ideal strategy to improve the photocatalytic activity. As expected, the BiSnO/BiOI heterojunction exhibited outstanding performance of degradation bisphenol A (BPA), the rate constant of BiSnO/BiOI heterojunction was 1.7 and 41.8 times higher than that of BiOI and BiSnO, respectively. The promoted activity could be attributed to the spatial separation of photogenerated carriers as well as redox reaction sites due to the discrete structure, and the enhanced charge separation due to the S-scheme mechanism via Bi-O channels as derived from DFT calculations. Furthermore, BiSnO/BiOI heterojunction exhibited unprecedented ultra-efficient in BPA degradation compared to other published Bi-based catalysts, and excellent performance under actual sunlight contributes to its prospective practical application. This strategy affords a novel approach for fabricating discrete S-scheme heterojunctions photocatalysts with high-efficiency, strong-stable, and sustainable.