A novel easily separated magnetic chalcogenide composite, KMS-1/L-Cystein/Fe₃O₄ (KCF), was successfully synthesized using bifunctional linker (L-Cystein) to connect KMS-1 and Fe₃O₄ nanoparticles, and was examined to remove ciprofloxacin (CIP) from aqueous solution. The composite was thoroughly characterized by XRD, SEM, EDX, FTIR and magnetization measurements techniques. The adsorption experiments were carried out and investigated under different conditions, such as contact time and pH of solution. The CIP removal reaction was found to better follow a pseudo-second-order kinetic model than the pseudo-first-order. The Langmuir adsorption isotherm was employed to understand the removal process. The pH of solution is critical for the adsorption of CIP on KCF, and the maximum adsorption (181.32 mg/g) of CIP could be reached under pH 6. In addition, the KCF adsorbent showed magnetization and operational stability, and it could be readily separated from solution by applying an external magnetic field. The high stability, performance, inexpensive, and easily recyclable KCF composite may serve as a promising adsorbent for water treatment.