The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-...The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-SO_(3)H,was prepared based on the oxidation of-SH group.Characterizations confirm the successful introduction of-SO_(3)H,good porosity,and stability of the material.The adsorbent exhibits excellent capture ability for Ba^(2+)due to strong hard acid-base and electrostatic interactions,with the adsorption capacity of 152.0 mg g^(-1)and fast equilibrium adsorption time,superior to other reported materials.Optimal pH was found to be almost neutral and temperature cannot affect the adsorption largely.Besides,the irreversible adsorption was demonstrated and thereby the secondary pollution may be avoided.Therefore,our work provides an efficient adsorbent for capturing Ba^(2+)irreversibly,and proposes a feasible strategy for constructing adsorbents with simultaneous high adsorption capacity and fast kinetics.展开更多
基金support by the National Natural Science Foundation of China(Nos.52071227,21978212,and 21706106)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2019L0657)State Key Laboratory of Separation Membranes and Membrane Processes(Tiangong University),China(No.M202102).
文摘The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-SO_(3)H,was prepared based on the oxidation of-SH group.Characterizations confirm the successful introduction of-SO_(3)H,good porosity,and stability of the material.The adsorbent exhibits excellent capture ability for Ba^(2+)due to strong hard acid-base and electrostatic interactions,with the adsorption capacity of 152.0 mg g^(-1)and fast equilibrium adsorption time,superior to other reported materials.Optimal pH was found to be almost neutral and temperature cannot affect the adsorption largely.Besides,the irreversible adsorption was demonstrated and thereby the secondary pollution may be avoided.Therefore,our work provides an efficient adsorbent for capturing Ba^(2+)irreversibly,and proposes a feasible strategy for constructing adsorbents with simultaneous high adsorption capacity and fast kinetics.
