MIL-101(Cr)has a special pore cage structure that provides broad channels for the transport of water molecules in the reverse osmosis(RO)water separation and purification.Combining MIL-101(Cr)with Fe_(3)O_(4) nanopart...MIL-101(Cr)has a special pore cage structure that provides broad channels for the transport of water molecules in the reverse osmosis(RO)water separation and purification.Combining MIL-101(Cr)with Fe_(3)O_(4) nanoparticles forms a water transport intermediate layer between the polyamide separation membrane and the polysulfone support base under an external magnetic field.MiL-101(Cr)is stable in both water and air while resistant to high temperature.With the introduction of 0.003 wt.%MIL-101(Cr)/Fe_(3)O_(4),the water flux increased by 93.31%to 6.65 L·m^(-2)·h^(-1)·bar^(-1) without sacrificing the NaCl rejection of 95.88%.The MIL-101(Cr)/Fe_(3)O_(4) multilayer membrane also demonstrated certain anti-pollution properties and excellent stability in a 72-h test.Therefore,the construction of a MIL-101(Cr)/Fe_(3)O_(4) interlayer can effectively improve the permeability of RO composite membranes.展开更多
Many efforts have been devoted to the integration of magnetic nanoparticles and metal organic frame- works, which makes it easy and simple to separate the nano-sized metal organic frameworks from liquid phase. Amino-f...Many efforts have been devoted to the integration of magnetic nanoparticles and metal organic frame- works, which makes it easy and simple to separate the nano-sized metal organic frameworks from liquid phase. Amino-functionalized magnetic metal organic frameworks[Fe3O4@MIL-100（Fe）-NH2] were prepared by a stepwise assembly method followed by post-modification with electron-rich reagent. This magnetic catalyst was characterized by means of X-ray diffraction（XRD）, transmission electron microscopy（TEM）, scanning electron micrnscopy（SEM） and nitrogen adsorption, and tested in Knoevenagel condensation as a base catalyst. The magnetic catalyst exhibits a core-shell structure and can afford a high activity for the Knoevenagel condensation due to its bifunctional property and reduced diffusion limitation. Furthermore, it could be recovered magnetically and recycled three times. Although activity loss was observed in the recycle experiments, it could be reactivated by dispersing in a fresh modifier solution.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.22308183,21776147,21905153,61604086,22378221,and 52002198)the Natural Science Foundation of Shandong Province(Grant Nos.ZR2023QB070 and ZR2021YQ32)+4 种基金the Taishan Scholar Project of Shandong Province(Grant No.tsqn201909117)the Qingdao Science and Technology Benefit the People Demonstration and Guidance Special Project(Grant No.23-2-8-cspz-11-nsh)the Qingdao Natural Science Foundation(Grant No.23-2-1-241-zyyd-jch)the China Postdoctoral Science Foundation(Grant No.2023M731856)Prof.Lifeng Dong also thanks financial support from the Malmstrom Endowed Fund at Hamline University。
文摘MIL-101(Cr)has a special pore cage structure that provides broad channels for the transport of water molecules in the reverse osmosis(RO)water separation and purification.Combining MIL-101(Cr)with Fe_(3)O_(4) nanoparticles forms a water transport intermediate layer between the polyamide separation membrane and the polysulfone support base under an external magnetic field.MiL-101(Cr)is stable in both water and air while resistant to high temperature.With the introduction of 0.003 wt.%MIL-101(Cr)/Fe_(3)O_(4),the water flux increased by 93.31%to 6.65 L·m^(-2)·h^(-1)·bar^(-1) without sacrificing the NaCl rejection of 95.88%.The MIL-101(Cr)/Fe_(3)O_(4) multilayer membrane also demonstrated certain anti-pollution properties and excellent stability in a 72-h test.Therefore,the construction of a MIL-101(Cr)/Fe_(3)O_(4) interlayer can effectively improve the permeability of RO composite membranes.
基金Supported by the National Natural Science Foundation of China（No.21203017）, the Open Fund of State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences（No.N-11-3）, the Program for Liaoning Excellent Talents in University, China（No.LNET-LJQ2014140） and the Fundamental Research Funds for the Central Universities, China （No.wd01201）.
文摘Many efforts have been devoted to the integration of magnetic nanoparticles and metal organic frame- works, which makes it easy and simple to separate the nano-sized metal organic frameworks from liquid phase. Amino-functionalized magnetic metal organic frameworks[Fe3O4@MIL-100（Fe）-NH2] were prepared by a stepwise assembly method followed by post-modification with electron-rich reagent. This magnetic catalyst was characterized by means of X-ray diffraction（XRD）, transmission electron microscopy（TEM）, scanning electron micrnscopy（SEM） and nitrogen adsorption, and tested in Knoevenagel condensation as a base catalyst. The magnetic catalyst exhibits a core-shell structure and can afford a high activity for the Knoevenagel condensation due to its bifunctional property and reduced diffusion limitation. Furthermore, it could be recovered magnetically and recycled three times. Although activity loss was observed in the recycle experiments, it could be reactivated by dispersing in a fresh modifier solution.
