Response surface methodology for adsorption of propylparaben using zeolitic imidazolate-67 modified by Fe3O4 nanoparticles from aqueous solutions
Mohammad Pourmohammad, Arezoo Ghadi, Ali Aghababai Beni
Abstract
ABSTRACT The applicability of zeolitic imidazolate-67 modified by Fe 3 O 4 nanoparticles, was studied for removing of propylparaben from aqueous solutions by adsorption method using response surface methodology. For the adsorption characterization of the adsorbent used in propylparaben adsorption, Brunauer–Emmett–Teller, Fourier-transform infrared spectroscopy, and scanning electron microscopy analyses were performed and the findings were compared. The impacts of variables, including initial propylparaben concentration ( X 1 ), pH ( X 2 ), adsorbent dosage ( X 3 ), and sonication time ( X 4 ), the highest removal efficiency was obtained as 98%, 10 mg·L –1 initial concentration, pH 6, 0.025 g adsorbent concentration, and 5 min contact time, respectively. The experimental data obtained were applied to the adsorption equilibrium and kinetic data it was seen that the data were for the Langmuir isotherm, pseudo-second-order kinetics, and maximum adsorption capacity (117.5 mg·g –1 ), respectively. Promising treatment capabilities of the ZIF-67-Fe 3 O 4 NPs have been during the comparative adsorption removal of propylparaben from deionized water against spiked natural water samples and synthetic Na + , K + , Ca 2+ , and Mg 2+ solutions. Overall results confirmed that ZIF-67-Fe 3 O 4 NPs like being recyclable, and cost-efficient made it a promising material for aqueous solutions.