Efficient removal of manganese ions from aqueous medium using a recyclable polymeric nanocomposite: A study of adsorption parameters and thermodynamics

摘要

Herein, hybrid polymeric nano-composite (HPNC) was used for manganese metal ions (Mn2+) removal from aqueous solution. Different parameters were used for adsorption tests. The equilibrium studies were confirmed using Freundlich and Langmuir isotherms and the adsorption capacity was calculated to be 162 mg/g for Mn2+ by fitting the equilibrium data to the Langmuir model. The kinetic parameters showed that Mn2+ ions adsorption on HPNC followed pseudo-second-order kinetic model. Furthermore, the negative values of Delta G and Delta H evidence that Mn2+ adsorption on HPNC is an exothermic and spontaneous process in nature. The desorption studies displayed the best recovery of Mn2+ ions in 0.1 M HCl indicating that they can be recycled in industrial processes. Regeneration studies showed 41.40% and 40.26% loss in Mn2+ adsorption and recovery after four consecutive cycles, respectively. These findings suggest that HPNC has the promising application as an effective and economically feasible adsorbent for Mn2+ removal.