Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents

Researchers are in continuous search of better strategies to minimize, if not prevent, the anthropogenic release toxic heavy metals, such as Cu(II) and Pb(II), into drinking water resources natural environment. Herein, we report for first time low-temperature combustion synthesis magnetic chitosan-manganese ferrite absence cross-linking agents its removal Pb(II) from single-component metal solutions. The nonlinear Langmuir model best described isotherm data, while pseudo-second order kinetic signifying monolayer or adsorption chemisorption rate-determining step, respectively. Adsorption capacities by obtained both metals were consistently higher than those manganese ferrite, indicating that chitosan enhanced performance adsorbent. maximum 14.86 15.36 mg g?1, 2.59 13.52 Moreover, adsorbents showed superior binding affinity sorption owing stronger ability former form inner-sphere complexes with ferrite. Finally, thermodynamic studies revealed uptake either was spontaneous endothermic. as-prepared adsorbent characterized morphology, elemental composition, surface functional sites, particle size using scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared dynamic light scattering technique,