PhotoMag is an innovative BiOI/Fe₃O₄-based photocatalyst engineered for efficient dye degradation and wastewater purification. By combining the visible-light responsiveness of BiOI with the magnetic recyclability of Fe₃O₄, PhotoMag offers a sustainable, reusable, and high-performance solution for environmental remediation. Its advanced photoactive structure harnesses light energy to break down organic pollutants, enabling eco-friendly water treatment with easy magnetic recovery.