Investigation of the effect of magnetic particles on the Crystal Violet adsorption onto a novel nanocomposite based on κ-carrageenan-g-poly(methacrylic acid)

A novel nanocomposite hydrogel prepared by incorporating Fe3O4 magnetic nanoparticles into the κ-carrageenan-g-poly (methacrylic acid) with in situ polymerization and was characterized by FT-IR, XRD, SEM, TEM and VSM. Synthesized nanocomposite was used to adsorb Crystal Violet (CV) (cationic dye) in aqueous solution in a batch system. The research studies showed that the adsorption of CV can be impressed as a function of contact time, initial concentration of CV, pH and molar ratio of κ-carrageenan to poly(methacrylic acid). CV adsorption tests disclosed that it only takes 15 min to reach the equilibrium and adsorption capacity for this dye was 28.24 mg g−1. Langmuir isotherm for equilibrium adsorption data was fitted well and the pseudo-second-order model can describe the adsorption kinetics. Thermodynamic parameters of ΔG°, ΔH° and ΔS° showed the endothermic nature of adsorption and a spontaneous process.