Application of the Fe3O4/ alginate/ diatomite nano-adsorbent for the adsorption of palladium and cyanide from wastewater: optimisation, kinetic and equilibrium studies

In this research, the adsorption rates of cyanide and palladium onto Fe3O4/alginate/diatomite nano-adsorbent (FADA) were evaluated. The co-precipitation technique was applied to synthesis FADA. response surface methodology (RSM) employed investigate relation between input-independent factors (initial pollutant concentration, contact time, FADA dosage pH) one dependent output (removal efficiency). best model selected based on results ANOVA analysis.SO due R2 0.929 insignificant lack fit (0.12) for also 0.98 as an appropriate both pollutants. Therefore, prediction optimisation pollutants FADAwere done SO model. conditions (95.65%) (92.66%) obtainedat (pH, 5.45; 15.13 mg L−1; 104.8 min dosage, g L−1) (pH,7.0; 4.88 91.06 2.05 L−1), respectively. Investigation non-linear isotherm models indicated adsorptions (R2 = 0.995) 0.999) ontoFADA have reasonably Sips model.The maximum capacities per mass unit 208.55 g−1 60.2 g−1, respectively.The pseudo-first-order 0.99) intra-particle diffusion 0.96) found agreement well with experimental data obtained palladium, Results sorption reactions endothermic exothermic, present study diatomite magnano composite boosted alginate polymer beads high operating groups a surface-to-volume ratio porosity can be efficient adsorbent removal from aqueous solutions.