S-scheme Ti0.7Sn0.3O2/g-C3N4 heterojunction composite for enhanced photocatalytic pollutants degradation

Herein we proposed a novel S-scheme Ti0.7Sn0.3O2/g-C3N4 heterojunction photocatalyst, which exhibited superior photocatalytic performance in contrast to the bare Ti0.7Sn0.3O2 and g-C3N4 under visible light. The optimized mass ratio of 10 wt% Ti0.7Sn0.3O2/g-C3N4 composite exhibits a favorable photocatalytic degradation capability of Rhodamine B (98.5%, 20 min) and tetracycline hydrochloride (88.3%, 40 min) in water, and exhibits excellent photocatalytic stability. The remarkable photocatalytic activity is attributed to the S-scheme between Ti0.7Sn0.3O2 and g-C3N4, which realizes effective separation and transfer to photo-generated charges. This work not only prepares a novel composite for photocatalytic pollutants degradation but also shows the significant role to photocarrier separation of S-scheme heterojunction structures.