<p>Magnetic iron oxide (Fe₃O₄) nanoparticles are widely recognized for their potential in environmental remediation owing to their excellent magnetic properties, chemical stability, and recyclability. However, their standalone photocatalytic performance remains limited due to rapid charge carrier recombination, particle agglomeration, and low surface activity. In this study, Fe₃O₄ was coupled with graphitic carbon nitride (g-C₃N₄) to form a Fe₃O₄/g-C₃N₄ ceramics nanocomposite, synthesized through a high-energy ball-milling process. XRD, FTIR, XPS, BET, Raman measurements were performed to demonstrate that Fe₃O₄ and g-C₃N₄ were successfully integrated to make a stable heterojunction. The incorporation of Fe₃O₄ reduced the bandgap energy of g-C₃N₄ from 2.81&#xa0;eV to 2.12&#xa0;eV, enhancing visible-light absorption. BET analysis revealed a surface area of 49.79 m²/g and mesoporous structure, supporting improved adsorption and charge transfer. Raman shift of T_12g and E_g modes also confirmed that there was a high interfacial interaction between Fe₃O₄ and g-C₃N₄. Under visible-light irradiation, the Fe₃O/g-C3N ceramics nanocomposite achieved 95% degradation of malachite green (MG) within 60&#xa0;min. The addition of H2O2 further promoted degradation through a photo-Fenton-like mechanism. Scavenger experiments also confirmed that ^•OH and <i>h</i>^<i>+</i> were the main reactive species, which validated the synergistic photocatalytic/photo-Fenton pathway. Furthermore, kinetic analysis followed pseudo-first-order behavior consistent with the Langmuir–Hinshelwood model. The material also demonstrated excellent stability, magnetic separability, and reusability across multiple cycles. The novelty of this work lies in the development of a magnetically recoverable Fe₃O₄/g-C₃N₄ ceramic nanocomposite via a green, solvent-free ball-milling approach, integrating visible-light photocatalysis with Fenton-like activity for sustainable wastewater treatment.</p>