Immobilization and recovery of uranium(VI) using Na-bentonite from aqueous medium: equilibrium, kinetics and thermodynamics studies

摘要: Abstract To better assess the environmental behavior and effect of uranium on living organisms more accurately, herein, Na-bentonite was used as an adsorbent for immobilization from radionuclide polluted wastewater. The experimental results demonstrated that sorption dynamics U(VI) could obtain equilibrium in a time period 10 h. performance surface material strongly dependent pH values solution. influenced by ionic strength at pH   7.5. presence fulvic acid (FA) or humic (HA) promoted onto low while suppressed high values. thermodynamic coefficients (i.e., ΔS0, ΔG0 ΔH0) calculated temperature-dependent isotherms illustrated process spontaneous endothermic. At values, dominated outer-sphere complexation ion exchange with Na+/H+ surfaces, whereas inner-sphere co-precipitation were main mechanism Considering its physicochemical stability removal property, prepared can be cost-effective potential recovery large volumes aqueous solutions.