Abstract
In this study, hydrogels of polyacrylic acid (PAA) were synthesised using free radical polymerization of acrylic acid. This process was carried out in an aqueous medium in the existence of ammonium persulfate (APS) acting as an initiator, and N, N'- methylene bisacrylamide (MBA), which is used as a crosslinker. There were four different acrylic acid hydrogel formulations made, and each had a different crosslinker concentration that varied from 0.5 to 2.0 mol% MBA. The next step includes the co-precipitation of PAA7 with iron oxide magnetite nanoparticles (PAA7/Fe3O4) for recover the hydrogel from batch mode using a magnetic field once Ultracidin pesticide has been absorbed from aqueous solutions. The adsorbent was characterized by FTIR, VSM, and XRD. The Ultracidin adsorption from an aqueous solution was studied by varying a number of parameters, including pH, contact time, temperature, adsorbent dose, and adsorbate concentration. Best adsorption efficiency was obtained at a temperature of 25°C, 60 minutes of contact time at pH 3, with 50 mg L-1, of initial pesticide concentration, and 4 g L-1 adsorbent dose. Several models were used to examine the adsorption kinetics of pesticide onto the adsorbent (PAA7/Fe3O4 NPs). The best effect showed that the pseudo second order model correlates with the experimental data. To determine the ideal adsorption capacity of the adsorbent, Langmuir, Freundlich, and Tempkin adsorption isotherms were utilized. Langmuir- model demonstrated a fitter than other models. The outcomes show that Ultracidin can be successfully removed from polluted water using (PAA7/Fe3O4 NPs) composite.
