Adsorption of Cd2+ ions onto magnetic Bentonite/Fe3O4 nanoparticles loaded on Alginate beads in simulated wastewater to protect the environment

Abstract

Nowadays, heavy metal pollutants are among the challenges facing humans and the environment. Bentonite/Fe3O4 nanoparticles and sodium alginate have high efficiency for adsorption of heavy metal ions. For the purpose, four groups of bentonite magnetic nanoparticles were synthesized at different weight ratios and the prepared magnetic nanoparticles were immobilized on alginate to form calcium alginate beads for elimination of cadmium ions in the synthetic pollutant solution in different condition of adsorbent dosage, pH, stirring rate, pollutant concentration and time of adsorption. The results show that the optimum condition for removal of Cd2+ was using 0.15 g of the prepared magnetic alginate/bentonite beads containing 0.4 g magnetic nano bentonite, duration of 8 h for adsorption time and stirring rate of 200 rpm. Furthermore, adsorption efficiency of the beads for adsorption of 100 ppm of Cd2+ solution was achieved about 98% and the adsorption of Cd2+ by using alginate magnetic beads following Freundlich isotherm model.