Efficient visible-light-driven S-scheme AgVO3/Ag2S heterojunction photocatalyst for boosting degradation of organic pollutants

The traditional semiconductor photocatalysts for solving the related environmental aggravation are often challenged by the recombination of photogenerated carriers. Designing an S-scheme heterojunction photo -catalyst is one of the keys to tackling its practical application problems. This paper reports an S-scheme AgVO3/ Ag2S heterojunction photocatalyst constructed via a straightforward hydrothermal approach that exhibits outstanding photocatalytic degradation performances to the organic dye Rhodamine B (RhB) and antibiotic Tetracycline hydrochloride (TC-HCl) driven by visible light. The results show that AgVO3/Ag2S heterojunction with a molar ratio of 6:1 (V6S) possesses the highest photocatalytic performances, 99% of RhB can be almost degraded by 0.1 g/L V6S within 25 min light illumination, and about 72% of TC-HCl can be photodegraded with the act of 0.3 g/L V6S under 120 min light irradiation. Meanwhile, the AgVO3/Ag2S system exhibits superior stability and maintains high photocatalytic activity after 5 repeated tests. Moreover, the EPR measurement and radical capture test identify that superoxide radicals and hydroxyl radicals mainly contribute to the photo -degradation process. The present work demonstrates that constructing an S-scheme heterojunction can effec-tively inhibit the recombination of carriers, providing insights into the fabrication of applied photocatalysts for practical wastewater purification treatment.

Automated summary

This paper reports the construction of an S-scheme AgVO3/Ag2S heterojunction photocatalyst via a straightforward hydrothermal approach, which exhibits outstanding photocatalytic degradation performances to Rhodamine B and Tetracycline hydrochloride. The highest photocatalytic performances are achieved with a molar ratio of 6:1 (V6S), where 99% of RhB can be degraded within 25 minutes of light illumination and about 72% of TC-HCl can be degraded within 120 minutes of light irradiation. The AgVO3/Ag2S system also exhibits superior stability and maintains high photocatalytic activity after repeated tests.