Fig. 7. (a) Removal of RhB in the photo-Fenton reaction using LFO or HPS-xLFO (x = 0.075, 0.15, and 0.3) and (b) corresponding degradation rate constants (reaction conditions: temperature = 25 °C, initial dye concentration = 10 mg L⁻¹, catalyst dosage = 1 g L⁻¹, initial H₂O₂ concentration = 10 mM and initial pH = 6).