Acid Orange II 1 Catalyst activity 1 Catalyst supports 1 Catalytic performance 1 Citrus fruits 1 Composite catalysts Degradation 1 Degradation kinetics 1 First order reactions 1 Heterogeneous fenton 1 Iron oxides 1 Its efficiencies 1 Kinetics 1 Magnetite 1 Manganese compounds 1 Montmorillonite KSF 1 Nanostructured materials 1 Oxidation 1 Reaction kinetics 1