N-doped-carbon encapsulated FeMoxOy nanoparticles for efficiently removing rhodamine B by oxidation of 1O2 generated from H2O2

In advanced oxidation processes (AOPs), the degradation of organic pollutants by the oxidation of reactive oxygen species (ROS) generated from the interaction between H2O2 and active species Fe2+/Fe3+ has gained significant attention. The cycle of Fe2+/Fe3+ in the catalytic oxidation plays a key role. Herein, a kind of N-doped carbon encapsulated FeMoxOy nanocrystalline material (FeMo@NC) was fabricated using a precipitation-calcination approach and applied to degrade organic pollutants in AOPs. The composite catalyst presents efficient catalytic activity for removing rhodamine B (RhB), methylene blue (MB), congo red (CR) and methyl orange (MO). The facilitating effect of Mo on the Fe2+/Fe3+ cycle and the phase structure and composition of the catalyst on the degradation was explored. Meanwhile, the recovery and reusability of the catalyst were assessed, proving its excellent stability in the degradation process. Quenching experiments demonstrate that the catalyst can activate H(2)O(2 )to generate singlet oxygen (O-1(2)) that serves as the main ROS to degrade RhB, and the degradation pathway and mechanism are then proposed.