A facile synthesis of SnS2/g-C3N4 S-scheme heterojunction photocatalyst with enhanced photocatalytic performance

Abstract

Constructing appropriate heterojunction systems has been considered the most promising among different methods for achieving effective charge transfer and separation to improve photocatalytic performance. Herein, SnS2/g-C3N4 composites consisting of SnS2 nanosheets loaded on a porous g-C3N4 matrix were successfully prepared via direct calcination from the precursors of tin (IV) chloride and thiourea. Under visible light, all the composites outperformed pure SnS2 and g-C3N4 in terms of Rhodamine B (RhB) photodegradation, and the highest removal efficiency after 6 h of irradiation was 92.22%. Their photocatalytic performance was significantly enhanced because of the positive synergistic relationship between semiconductors (SnS2 and g-C3N4) and the rational Step-scheme charge transfer mechanism. Thus, these composites contributed to the strong redox power, high migration efficiency, and extended lifetime of photogenerated carriers.

Keywords

• Photocatalysis
• S-scheme heterojunction
• g-C3N4
• SnS2
• SnS2/g-C3N4 composite