Bi2MoSxO6-x/α-CoS Crystalline/Amorphous S-scheme heterojunction for visible Light-Driven targeted Photo-decomposition of amoxicillin

Amorphous α-CoS, which has abundant unsaturated active sites, was used to construct Bi2MoSxO6-x/α-CoS crystalline/amorphous S-scheme heterojunction on the crystalline surface of Bi2MoSxO6-x to decompose amoxicillin. Amorphous surface adsorbed amoxicillin and activated it through elongating C−N and C=O bonds. Meanwhile, using S to partial substitute O in the MoO6 octahedron to tune the band structure of Bi2MoSxO6-x for increasing the visible-light utilization and optimizing the redox capability. Accordingly, the visible light absorbance range was extended to 735 nm with outstanding photo-electronic capabilities. The degradation rate catalyzed by Bi2MoSxO6-x/α-CoS was promoted by two orders of magnitude, much higher than that of most of the reported photocatalysts. Furthermore, LC−MS/MS was employed to precisely track the amoxicillin degradation pathways. It was discovered that by attacking the reactive atoms of S7, N13, O21, C23, and O24 in amoxicillin, free radicals generated a series of intermediates with no apparent toxicity assessed by ecological structural activity relationships.