In suit constructing S-scheme FeOOH/MgInS heterojunction with boosted interfacial charge separation and redox activity for efficiently eliminating antibiotic pollutant.

Photocatalytic elimination of antibiotic pollutant is an appealing avenue in response to the water contamination, but it still suffers from sluggish charge detachment, limited redox capacity as well as poor visible light utilization. Herein, a particular S-scheme FeOOH/MgInS heterojunction with wide visible light absorption was triumphantly constructed by in-situ growth of MgInS nanoparticles onto the surface of FeOOH nanorods, and employed as a high-efficiency visible light driven photocatalyst for removing tetracycline (TC). Conspicuously, the as-obtained FeOOH(15 wt%)/MgInS elucidated the optimal TC removal rate of 0.01258 min after 100 min of visible light illumination, which was almost 33.1 and 6.6 times larger than those of neat FeOOH and MgInS, separately. The exceptional degradation performance was principally put down to the establishment of S-scheme heterojunction between FeOOH and MgInS, which could not merely accelerate the detachment of photogenerated carriers, but also retain the powerful reducing ability of photoinduced electrons for MgInS and high oxidizing capacity of photoexcited holes for FeOOH, strongly driving the generation of plentiful active species including holes, superoxide and hydroxyl radicals. Additionally, the possible degradation mechanism and pathways of TC were also speculated. This work offers a valuable perspective for constructing high-efficiency S-scheme heterojunction photocatalysts for eradicating antibiotics.