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In the present investigation, adsorption of Cu 2+ , Ni 2+  and Zn 2+  ions is carried out on the surface of novel composite made up of bentonite clay and red-ocher. The study of molecular dynamics through dimensionless numbers,  N kandproved that adsorption of Cu 2+ , Ni 2+  and Zn 2+  ions on the surface of composite was diffusion controlled. A deviation of 0.08% for Cu 2+ , 1.26% for Ni 2+  and 0.53% for Zn 2+  ions between experimental and artificial neural network model predicted values reflected that the back-propagation technique involving Levenberg-Marquardt algorithm was appropriate for the prediction of the output function. The physico-chemical characterization of composite indicated fluffy composite surface housing hydroxyl group, Si-O stretching and Si-O-Al vibration. These groups were due to aluminum-rich octahedral centers and Si-O bond stretching of silica and quartz. The X-ray diffractogram of composite depicted the presence of quartz, alumina, montmorillonite and hematite in the composite that played a significant role in adsorbing heavy metal ions. The Langmuir isotherm and pseudo-second-order kinetic model showed lower values of sum of square of residuals compared to other models. This showed that sorption of Cu 2+ , Ni 2+  and Zn 2+  ions followed monolayer coverage coupled with chemisorption mode. The composite possesses high adsorption capacity such as 61.86 mg/g for Cu 2+  ions, 37.89 mg/g for Ni 2+  ions and 10.48 mg/g for Zn 2+  ions. The adsorption of metal ions onto composite surface was endothermic with increased randomness at the solid–liquid interface.

Development of sustainable and ecofriendly metal ion scavenger for adsorbing Cu2+, Ni2+ and Zn2+ ions from the aqueous phase