Adsorptive performance of tetracarboxylic acid-modified magnetic silica nanocomposite for recoverable efficient removal of toxic Cd(II) from aqueous environment: Equilibrium, isotherm, and reusability studies

Herein, mesoporous magnetic nanocomposite (Fe3O4@SBTCA) was specifically designed and fabricated for its high efficient application in the removal of toxic Cd(II) ions from aquatic environment. The structure, surface characteristics, composition nanocomposites were characterized by FT-IR, BET analysis, XRD, TEM, EDX, Zeta potential measurement TGA analysis. TEM images XRD exhibited average particle size Fe3O4@SBTCA less than 22 nm. impact different variables on adsorption explored using batch method findings revealed that highest capacity 158.68 mg/g achieved at pH 7.5 solution temperature 25 °C after 120 min agitation 100 rpm. Nonlinear Elovich models pseudo first-order second-order equations applied to study kinetics results reveal first order best describe kinetics. isotherm modeling non-linear Freundlich could fit data better others, such as Dubinin Radushkevich Langmuir models, indicating physisorption nature. thermodynamic analysis verified process exothermic. showed good recoverable efficiency up four times recycling.