Clinoptilolite was treated with HCl for the purpose of using it as adsorbent for the removal of Cu2+ from the synthetic wastewater. The treated clinoptilolite was characterised using XRF and SEM to determine its chemical composition and morphology, respectively. The results showed that treatment of clinoptilolite with HCl affects its chemical composition and morphology. The critical parameters affecting the adsorption of Cu2+ were also investigated by utilizing clinoptilolite natural zeolite as the potential adsorbent at various initial concentrations of the copper ion in the synthetic wastewater. The analyses of the results obtained revealed that the adsorption of Cu(II) from synthetic water is strongly dependent on pH, temperature, and contact time and mass of the adsorbent. It was found that pH of four, contact time of 75 min, temperature of 90 ° C, and mass of adsorbent of 10 g are the best conditions for the removal of Cu2+ from the synthetic wastewater. The equilibrium sorption isotherms were analyzed by the Langmuir and the Freundlich isotherms and the analyses of the results showed that Freundlich isotherm described the adsorption process better than the latter. The equilibrium data showed an endothermic nature of adsorption. The thermodynamic parameters obtained from the equilibrium data indicated that the adsorption process is endothermic with increase in entropy of the solid-solution interface during the adsorption of cation onto the clinoptilolite.
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