A superior dual functional S-scheme NiMoO4/Mg–Al LDH heterojunction for simultaneous redox photocatalysis

Abstract

A heterojunction photocatalyst, NiMoO₄/Mg-Al layered-double hydroxide (LDH), was synthesized for simultaneous chloramphenicol degradation and Cr(VI) reduction under visible light. It outperformed individual components (NMO, LDH) and composites, maintaining >90% efficiency over five cycles. Synergy involved ˙OH/O₂⁻-mediated chloramphenicol oxidation and direct electron transfer for Cr(VI) reduction, confirmed by LC-MS and scavenger studies.