The selective elimination of radioactive cesium from complicated wastewater is imperative in view of environment and human health.Montmorillonite has been accepted as one of the most promising adsorbents for cesium pu...The selective elimination of radioactive cesium from complicated wastewater is imperative in view of environment and human health.Montmorillonite has been accepted as one of the most promising adsorbents for cesium purification.However,its poor selectivity still remains a major challenge.Herein,a novel montmorillonite-sulfur composite was developed via a facile one-step solvent-free method and used for Cs^(+) removal.Owing to the fact that soft Lewis base S^(2-) ligand interacted more strongly with softer Lewis acid Cs^(+) than other cations,the capacity and selectivity towards Cs^(+) was significantly enhanced.In this case,a large capacity of 160.9 mg g^(-1) was achieved.The distribution coefficient value(~4000 mL g^(-1))was 3-times larger than that of pristine montmorillonite(~1500 mL g^(-1)).Moreover,this composite could be easily recycled and reused within five times recycling experiments.Therefore,this low-cost and facilely prepared composite are expected to be used for the selective removal of Cs^(+) from complicated wastewater containing various competing ions.展开更多
基金partial financial supports from the National Natural Science Foundation of China(21901183 and 21773170)Innovation Project of Excellent Doctorial Dissertation of Tianjin University of Science and Technology(201909)+2 种基金National Undergraduate Innovation and Entrepreneurship Training Project(201910057101)the Major Special Project of Tibet Autonomous Region(XZ201801-GB01)the Yangtze Scholars and Innovative Research Team of the Chinese University(IRT_17R81)。
文摘The selective elimination of radioactive cesium from complicated wastewater is imperative in view of environment and human health.Montmorillonite has been accepted as one of the most promising adsorbents for cesium purification.However,its poor selectivity still remains a major challenge.Herein,a novel montmorillonite-sulfur composite was developed via a facile one-step solvent-free method and used for Cs^(+) removal.Owing to the fact that soft Lewis base S^(2-) ligand interacted more strongly with softer Lewis acid Cs^(+) than other cations,the capacity and selectivity towards Cs^(+) was significantly enhanced.In this case,a large capacity of 160.9 mg g^(-1) was achieved.The distribution coefficient value(~4000 mL g^(-1))was 3-times larger than that of pristine montmorillonite(~1500 mL g^(-1)).Moreover,this composite could be easily recycled and reused within five times recycling experiments.Therefore,this low-cost and facilely prepared composite are expected to be used for the selective removal of Cs^(+) from complicated wastewater containing various competing ions.
