<p>The development of multifunctional materials capable of efficient adsorption and catalytic degradation of organic pollutants is critical for sustainable wastewater treatment. In this study, a novel magnetic ternary composite based on MOF-808, poly (ionic liquid) (PIL), and Fe₃O₄ nanoparticles. Structural characterization using XRD, FTIR, SEM, TEM, BET, and TGA confirmed the successful incorporation of PIL and Fe₃O₄ into the MOF framework, resulting in enhanced porosity, improved thermal stability, and modified surface functionality. The composite exhibited significantly enhanced adsorption performance, achieving a maximum adsorption capacity of 612 ± 31 mg g⁻¹, compared to 217 ± 11 mg g⁻¹ for pristine MOF-808. Adsorption kinetics followed a pseudo-second-order model, indicating a chemisorption-dominated process. Furthermore, the composite demonstrated superior photocatalytic activity under visible light through efficient activation of peroxymonosulfate, achieving 96 ± 3.84% degradation of Congo Red within 30&#xa0;min. The enhanced performance was attributed to synergistic effects among the high surface area of MOF-808, electrostatic interactions provided by PIL, and the catalytic and magnetic properties of Fe₃O₄, which facilitated reactive oxygen species generation and improved charge transfer. In addition, the composite showed excellent reusability, maintaining 89 ± 3.41% removal efficiency after six cycles with minimal iron leaching. These results demonstrate that the MOF-808/PIL/Fe₃O₄ composite is a promising multifunctional material for efficient adsorption and catalytic degradation of organic pollutants in wastewater treatment applications.</p>