The aim of this study was to construct a magnetized detachable catalyst (MDC) of Ag-decorated Fe₃O₄ nanocomposites and evaluate their antibacterial efficacy and photocatalytic capabilities. The results showed that the Ag-decorated Fe₃O₄ nanocomposites displayed exceptional antibacterial efficacy towards Pseudomonas aeruginosa and high photocatalytic capabilities towards organic hue inhibition. The kinetics investigation revealed that the Ag@ Fe₃O₄ nanocomposites eradicated 99.9% of Rhodamine B at a rate variable of 1.89 min⁻¹. The magnetically detachable catalyst was found to be reusable without affecting the efficiency of photocatalytic reactions. These findings suggest that the Ag@Fe₃O₄ nanocomposites have promising applications in wastewater treatment and biomedical research.