In this study, magnetic Fe3O4@MoS2nanocomposite was synthesized via a simple in-situ hydrothermal method and applied for efficiently and recyclably removing hazardous dyes from aqueous solutions. The Fe3O4@MoS2nanocomposite exhibited excellent adsorption performance, achieving a capacity of 120.4 mg/g in the methylene blue adsorbing experiment using 20 mg of adsorbent (Fe3O4@MoS2) and 100 mL of a 30-ppm methylene blue solution. Notably, the Fe3O4@MoS2nanocomposite rapidly adsorbed methylene blue with a rate constant of 4.01 mg g−1·min−1and reached the equilibrium within 30 min. Kinetic modeling confirmed a pseudo-second-order mechanism, and the adsorption process was well described by the Langmuir isotherm. In addition to methylene blue, the nanocomposite also exhibits an effective removal performance to crystal violet and methyl orange in various water matrices, including tap and lake water. The magnetic properties of these nanocomposites facilitated easy separation and especially reuse, with adsorption efficiency decreasing only slightly from 77.87 % to 73.76 % after three cycles, thereby maintaining approximately 94 % of the initial removal efficiency and confirming their high stability. These results underscore the potential of Fe3O4@MoS2nanocomposites as promising, scalable, and reusable adsorbents for industrial wastewater treatment and hazardous dye remediation.
