Green synthesis of eco-friendly magnetic metal-organic framework nanocomposites (AlFum -graphene oxide) and pollutants (dye and pharmaceuticals) removal capacity from water

Herein, Graphene Oxide (GO), CoFe2O4, CoFe2O4/GO nanocomposite, aluminum fumarate (AlFum), and AlFum-CoFe2O4/GO (ACG) eco-friendly nanocomposites with different amounts of CoFe2O4/GO nanocomposite (5, 10, and 15 wt% denoted as 5ACG, 10ACG, and 15ACG, respectively) were green synthesized and characterized using FTIR, SEM, XRD, TEM, XRD, EDX, and BET. The XRD patterns of ACGs indicate that AlFum is fixed onto the surface of CoFe2O4/GO and its structure is well maintained. The SEM and TEM images indicated the 10ACG with good size distribution and shape. The EDX spectrum of ACG showed the homogeneous distribution of O, Fe, and Co in the synthesized materials. The synthesized ACG nanocomposite dispersed in water could be effortlessly separated from wastewater by an external magnet within several seconds. The dye (Direct Red 23: DR23) adsorption capacity of AlFum, 5ACG, 10ACG, and 15ACG was 120, 145, 230, and 167 mg/g, respectively. The Langmuir isotherm is a more adequate isotherm for characterizing the adsorption (R2 = 0.9998, 0.9918, 0.9997, and 0.9996 for AlFum, ACG-5, ACG-10, and ACG-15 respectively). Adsorption followed the pseudo-second-order kinetic. In addition, the synthesized composite had pharmaceuticals (tetracycline and doxycycline) removal ability.