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Cumin seeds extract containing plant polyphenols was used as a reducing agent forthe preparation of iron-based magnetic nanoparticles. Then, functionalised magnetic nanoparticles (FMNPs) and chitosan were used to synthesise a novel magnetic polymeric nanocomposite (MPNC) with high efficiency and fast sorption kinetics for Reactive Black 5 removal. FMNPs and MPNC were characterised by Fourier transform infrared, vibrating sample magnetometer, field emission scanning electron microscopy, X-ray diffraction, and Zeta potential. The functionalised magnetic nanoparticles had a spherical shape with the size in the range of 22–38 nm that was covered with chitosan. The zeta potential of MPNC was +59.7 mV. Thepresence of Fe 3 O 4  nanoparticles in MPNC sorbent and its crystalline structure was confirmed by FTIR and XRD, respectively. Results showed that the synthesised sorbent has an excellent sorption behaviour for Reactive Black 5 at room temperature and pH range of 5.5–6.5. The time required to reach equilibrium for various concentrations of Reactive Black 5 was ~ 100 seconds, and a 120 mg L −1 of dye solution was 92% decolourised within this time. Experimental data were best fitted to the semi-first-order kinetics and Halsey thermodynamic models. The sorbent maximum capacity was 989.9 mg g −1 .

Green synthesis of a high capacity magnetic polymer nanocomposite sorbent based on the natural products for removal of Reactive Black 5