Environmental pollution is one of the important concerns for human health. There are different types of pollutants and techniques to eliminate them from the environment. We hereby report an efficient method for the remediation of environmental contaminants through the catalytic reduction of the selected pollutants. A green method has been developed for the immobilization of copper nanoparticles on magnetic lignosulfonate (Cu NPs@Fe3O4-LS) using the aqueous extract of Filago arvensis L. as a non-toxic reducing and stabilizing agent. The 21 characterization of the prepared Cu NPs@Fe3O4-LS was achieved by vibrating sample magnetometer (VSM), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), high resolution TEM (HRTEM), X-ray diffraction (XRD), scanning TEM (STEM), thermogravimetry-differential thermal analysis (TG/DTA), fast Fourier transform (FFT), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron (XPS) analyses. The synthesized Cu NPs@Fe3O4-LS was applied as a magnetic and green catalyst in the reduction of Congo Red (CR), 4-nitrophenol (4-NP), and 28 methylene blue (MB). The progress of the reduction reactions was monitored by UV-Vis 29 spectroscopy. Finally, the biological properties of the Cu NPs@Fe3O4-LS were investigated. The 30 prepared catalyst demonstrated excellent catalytic efficiency in the reduction of CR, 4-NP, and 31 MB in the presence of sodium borohydride (NaBH4) as the reducing agent. The appropriate 32 magnetism of Cu NPs@Fe3O4-LS made its recovery very simple. The advantages of this process 33 include a simple reaction set-up, high and catalytic antibacterial/antioxidant activities, short 34 reaction time, environmentally friendliness, high stability, and easy separation of the catalyst. In 35 addition, the prepared Cu NPs@Fe3O4-LS could be reused for four cycles with no significant 36 decline in performance

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