Bifunctionalized Fe7S8@MoS2-O core-shell with efficient photocatalytic activity based on internal electric field

The photocatalytic degradation of toxic water pollutants (dyes, antibiotics, microorganisms, etc.) have attracted much attention, but the lack of catalysts with strong visible light absorption and long carrier life have limited the sustainable development of clean water worldwide. In order to solve this problem, the one-pot hydrothermal method was employed to fabricate Fe7S8@MoS2-O conduct-semiconductor-type catalyst for the first time.Fe7S8@MoS2-O appears as a core-shell structure. Malachite green (MG) and Levofloxacin (LVX) could be efficiently decomposed by Fe7S8@MoS2-O (75.7% and 81.3%, respectively) within 80 min and be further increased to 97.5% and 92.7% with peroxymonosulfate (PMS). The high disinfection performance for Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) are also obtained within 30 min (2.11 x 10(7) cfu/mL of S. aureus and 2.96 x 10(5) cfu/mL of E. coli inactivation). As a remarkable co-catalyst, the oxygen incorporated MoS2 (MoS2-O) was introduced into Fe7S8 to construct conductor-semiconductor-type heterojunction, which not only greatly facili-tates Fe3+/Fe2+ cycle to yield a large number of active radicals but also builds a internal electric field (E-field) to accelerate charge carrier transport. The band structures of Fe7S8 and MoS2 is conducted to elucidate the elec-tronic structures of the photocatalyst according to the density functional theory (DFT) calculation. This study provides a strategy to design the efficient photocatalyst for environmental remediation.