1：Experimental Design and Method Selection:

Manganese substituted strontium hexaferrites (SrMnxFe12-xO19) were synthesized using chemical co-precipitation method. The synthesized materials were characterized using various techniques including FT-IR, XRD, FE-SEM, HR-TEM, BET surface area analysis, VSM, UV-vis DRS, and XPS. The photocatalytic and adsorption performances were evaluated for the degradation and removal of model pollutants (MO, RDR, PNP) under visible light irradiation using photo-Fenton process.

2：Sample Selection and Data Sources:

Metal salts (Sr(NO3)2, Fe(NO3)3·9H2O, MnCl2·4H2O) and pollutants (MO, RDR, PNP) were obtained from commercial suppliers. Samples were synthesized with varying Mn content (x=0.0 to 5.0).

3：0 to 0). List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included FT-IR spectrometer (Nicolet iS50), X-ray diffractometer (Panalytical’s X’Pert Pro), FE-SEM (Hitachi-SU8010), HR-TEM (FEI Tecnai G2 F20), BET surface area analyzer (Belsorp max), VSM (155 PAR), UV-vis spectrophotometer (JASCO V-750), UV-vis DRS, XPS (ESCA+, Omicron Nanotechnology), and 400W Hg lamp. Materials included strontium nitrate, ferric nitrate, manganese chloride, sodium hydroxide, hydrogen peroxide, methyl orange, remazol deep red, p-nitrophenol.

4：Experimental Procedures and Operational Workflow:

Synthesis involved dissolving metal salts in distilled water, adjusting pH to 12 with NaOH, stirring, filtering, washing, drying at 100°C, and annealing at 600°C and 800°C. Catalytic and adsorption experiments involved dispersing catalyst in pollutant solution, adjusting pH, stirring in dark for adsorption-desorption equilibrium, irradiating with visible light after adding H2O2, sampling at intervals, separating catalyst with magnet, and analyzing supernatant with UV-vis spectrophotometer.

5：Data Analysis Methods:

Data analysis included calculation of crystallite size using Debye-Scherrer equation, lattice parameters using Le-Bail refinement, band gap using Tauc relation, degradation efficiency using absorbance measurements, adsorption capacity using equilibrium equations, and kinetic studies using pseudo-first order and pseudo-second order models.