Starch-grafted-poly(acrylic acid)/Pterocladia capillacea–derived activated carbon composite for removal of methylene blue dye from water

Abstract Starch-g-poly(acrylic acid)/ Pterocladia capillacea –derived activated carbon (St-g-P(AA)/P-AC) composites were prepared via aqueous solution graft copolymerization using starch, acrylic acid, and of red alga (0–10%) with N , N′ -methylenebisacrylamide crosslinker ammonium persulfate (NH 4 ) 2 S O 8 initiator. Fourier-transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) used to characterize St-g-P(AA)/P-AC composites. Additionally, investigated for methylene blue (MB) dye removal from water. The impact the beginning concentration MB dye, temperature, pH, adsorption time on was examined. maximum capacity obtained at pH 496.29 mg/g 0.02 mg/L dose 100 dye. properties studied by isotherm, kinetic, thermodynamic models. pseudo-first-order Freundlich isotherm models demonstrated kinetics equilibrium adsorptions data, respectively. monolayer ( q m 1428.57 Langmuir isotherm. Thermodynamic parameters indicated that is exothermic physisorption spontaneous. results show effective water could be recycled.