The efficient extraction of sodium(Na^(+))and lithium(Li^(+))from seawater and salt lakes is increasingly demanding due to their great application value in chemical industries.However,coexisting cations such as divale...The efficient extraction of sodium(Na^(+))and lithium(Li^(+))from seawater and salt lakes is increasingly demanding due to their great application value in chemical industries.However,coexisting cations such as divalent calcium(Ca^(2+))and magnesium(Mg^(2+))ions are at the subnanometer scale in diameter,similar to target monovalent ions,making ion separation a great challenge.Here,we propose a simple and fast secondary growth method for the preparation of MIL-53(Al)-NH_(2)membranes on the surface of anodic aluminum oxide.Such membranes contain angstrom-scale(~7Å)channels for the entrance of small monovalent ions and water molecules,endowing the selectivities for monovalent cations over divalent cations and water over salt molecules.The resulting high-connectivity MIL-53(Al)-NH_(2)membranes exhibit excellent ion separation performance(a selectivity of 121.42 for Na^(+)/Ca^(2+)and 93.81 for Li^(+)/Mg^(2+))and desalination performance(a water/salt selectivity of up to 5196).This work highlights metal–organic framework membranes as potential candidates for realizing ion separation and desalination in liquid treatment.展开更多
采用新配比(n(Cr3+):n(H2BDC):n(H2O)=1:2:280),水热法合成MOFs材料MIL-53(Cr)。材料后处理过程采用溶剂置换法。通过XRD、TG、SEM、IGA的表征手段对不同条件下合成后MIL-53(Cr)产物进行结构表征;通过N2、CO2、CH4、C2H4、C2H6单组份气...采用新配比(n(Cr3+):n(H2BDC):n(H2O)=1:2:280),水热法合成MOFs材料MIL-53(Cr)。材料后处理过程采用溶剂置换法。通过XRD、TG、SEM、IGA的表征手段对不同条件下合成后MIL-53(Cr)产物进行结构表征;通过N2、CO2、CH4、C2H4、C2H6单组份气体吸附实验对样品的吸附性能进行测试。结果显示:新的制备方案在制备过程中能够更稳定地合成出高纯度的MIL-53(Cr)产物,溶剂置换的后处理方法能够有效的将孔道内H2BDC除去,经过后处理MIL-53(Cr)比表面积为1355.9 m2 g 1,通过初步的气体吸附实验表明该材料具有广阔的应用前景。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(WK2060000030)USTC Research Funds of the Double First Class Initiative(YD2060002022)Major Science and Technology Innovation Projects in Shandong Province(2022CXGC020415).
文摘The efficient extraction of sodium(Na^(+))and lithium(Li^(+))from seawater and salt lakes is increasingly demanding due to their great application value in chemical industries.However,coexisting cations such as divalent calcium(Ca^(2+))and magnesium(Mg^(2+))ions are at the subnanometer scale in diameter,similar to target monovalent ions,making ion separation a great challenge.Here,we propose a simple and fast secondary growth method for the preparation of MIL-53(Al)-NH_(2)membranes on the surface of anodic aluminum oxide.Such membranes contain angstrom-scale(~7Å)channels for the entrance of small monovalent ions and water molecules,endowing the selectivities for monovalent cations over divalent cations and water over salt molecules.The resulting high-connectivity MIL-53(Al)-NH_(2)membranes exhibit excellent ion separation performance(a selectivity of 121.42 for Na^(+)/Ca^(2+)and 93.81 for Li^(+)/Mg^(2+))and desalination performance(a water/salt selectivity of up to 5196).This work highlights metal–organic framework membranes as potential candidates for realizing ion separation and desalination in liquid treatment.
文摘采用新配比(n(Cr3+):n(H2BDC):n(H2O)=1:2:280),水热法合成MOFs材料MIL-53(Cr)。材料后处理过程采用溶剂置换法。通过XRD、TG、SEM、IGA的表征手段对不同条件下合成后MIL-53(Cr)产物进行结构表征;通过N2、CO2、CH4、C2H4、C2H6单组份气体吸附实验对样品的吸附性能进行测试。结果显示:新的制备方案在制备过程中能够更稳定地合成出高纯度的MIL-53(Cr)产物,溶剂置换的后处理方法能够有效的将孔道内H2BDC除去,经过后处理MIL-53(Cr)比表面积为1355.9 m2 g 1,通过初步的气体吸附实验表明该材料具有广阔的应用前景。
