Improving the Fenton catalytic performance of FeOCl using an electron mediator.

• FeOCl/MoS 2 catalyst shows supreme efficiency for OH generation. • FeOCl/MoS 2 catalyst can effectively degrade various organic pollutants. • FeOCl/MoS 2 catalyst has high pH and salinity tolerance in Fenton-like reactions. • The Fe − O–Mo electron mediator facilitates the active Fe2+ regeneration in FeOCl. FeOCl Fenton-like catalyst has drawn much attention due to its high catalytic activity. Nevertheless, the potential application of FeOCl is significantly hindered by the sluggish reduction kinetics of Fe3+ to active Fe2+. Here, we report that the incorporation of Fe − O–Mo electron mediator into FeOCl via forming a FeOCl/MoS 2 composite can facilitate the Fe2+ regeneration through the oxidation of Mo4+ to Mo6+, which boosts the hydroxyl radicals yields, thus leading to a significantly improved catalytic performance. The removal efficiency of methylene blue (MB, 50 mg L−1) achieves ∼100% within 2 min. with low dosage of FeOCl/MoS 2 (0.2 g L−1) and H 2 O 2 (0.6 mM). FeOCl/MoS 2 not only has broad working pH range (∼3 − 9) and high salinity tolerance (100 mM), but also capable to degrade various organic pollutants. For practical application, the fabricated FeOCl/MoS 2 membrane effectively degrades continuous MB flow. This study demonstrates that incorporating an electron mediator is an effective way to improve the catalytic performance of heterogeneous Fenton-like catalysts. [ABSTRACT FROM AUTHOR]