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

Amorphous & alpha;-CoS, which has abundant unsaturated active sites, was used to construct Bi2MoSxO6-x/& alpha;-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/& alpha;-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.

Automated summary

Amorphous α-CoS was used to construct a Bi2MoSxO6-x/α-CoS crystalline/amorphous S-scheme heterojunction on the crystal surface of Bi2MoSxO6-x, which effectively decomposed amoxicillin. The amorphous α-CoS adsorbed and activated amoxicillin through elongating C-N and C=O bonds. The band structure of Bi2MoSxO6-x was optimized by partial substitution of S for O, which increased visible-light utilization and redox capability. The degradation rate catalyzed by Bi2MoSxO6-x/α-CoS was significantly higher than most reported photocatalysts, and LC-MS/MS analysis revealed the degradation pathways of amoxicillin.