One-pot synthesis of magnetic oil shale semi-coke nanocomposite for Fenton-like catalytic organic dye degradation: Performance and mechanism

The conversion of oil shale semi-coke (OSC) is into high-value materials has been an attractive area in waste recycling. In this study, a novel Fenton-like catalyst (Fe3O4/POSC) was successfully prepared using in-situ one-pot oxidation precipitation method for degradation of Methylene Blue (MB). The composition, morphology and properties of the materials were characterized. It was found that Fe3O4/POSC was a mesoporous material with graphene-like structure. The synergistic effect among oxygen functional groups, oxygen vacancies, unsaturated bonds and Fe2+/Fe3+ cycling in Fe3O4/POSC improved the superior degradation performance of MB. Under the optimal conditions (catalyst 1.0 g/L, pH 3.0, and H2O2 25 mmol/L), Fe3O4/POSC exhibited highly efficient degradation (92.73 % in 30 min, 99.54 % in 180 min) and stability (89.72 % after 6 cycles) of MB with low Fe leaching(