Fe3O4-NPs/orange-peel (MOP) composite was prepared via one-step in-situ co-precipitation method as magnetic heterogeneous Fenton-like catalyst. The properties of MOP were characterized by SEM, TEM, BET, XRD, FT-IR, TGA and XPS technologies. Its Fenton-like catalytic responses towards removal of methyl orange (MO) were investigated, in which the effects of initial dye concentration, pH, temperature and H2O2 dosage were studied. The MO degradation ratio up to 98.0% was obtained within 20 min in optimized conditions. The catalyst also shows excellent catalytic stability exhibiting nearly 90% degradation ratio in 10th cycle within 20 min, whereas pure Fe3O4-NPs showing only 62.5% in this stage. Due to the stabilization of complexing orange peel hydroxyl to Fe oxide in the composite and its magnetic separation property, Fe3O4-NPs/orange-peel composite exhibits excellent Fenton-like catalytic performance which offers great prospects for low-cost and high-efficiency organic dye wastewater treatment.


  • Cheap raw materials like waste biomass and common Fe salts;

  • Fe3O4/orange peel composite as heterogeneous Fenton-like catalyst;

  • 98.0% for 30 ppm MO within 20 min can be degraded in optimized condition;

  • Easy separation: fast magnetic separation from aqueous solution within 1 minute;

  • Superior cycle catalytic stability: MO (20 ppm) degradation ratio reaches up to nearly 90% within 20 minutes in the 10th cycle.

Graphical Abstract

Graphical Abstract
Graphical Abstract
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