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In chemistry, the term "neutral charge" is used to refer to an atom or collection of atoms that contains neither a positive nor negative charge. To have a neutral charge, the atom must have an equal number of protons and electrons. Protons give an atom a positive charge, while electrons give it a negative charge.
A composite film and a method and apparatus for preparing the same
PendingCN122252028AHigh mechanical strengthgood choiceSemi-permeable membranesMixing methodsChemical physicsMetal-organic framework
The application belongs to the technical field of membrane separation, and particularly relates to a composite membrane and a preparation method and device thereof, which comprises the following steps: S1, a macroporous neutral charge base membrane is selected, a supporting substrate is used to support the base membrane, and the base membrane is assembled into a polytetrafluoroethylene diffusion cell to divide the diffusion cell into two independent chambers; S2, a ligand solution is prepared and injected, and a metal organic framework precursor solution is prepared according to a 1:1 molar ratio; metal organic framework materials with sub-nanometer channels are synthesized in-situ in membrane holes through diffusion effects of two specific ligands in the membrane holes, and the membrane holes of the base membrane are filled with the materials to prepare a high-performance composite membrane, the synthesis process of the membrane material avoids inevitable surface charges and defects of the metal organic framework materials in a traditional membrane preparation method, the mechanical strength of the composite membrane is improved by introducing a polymer base, and the sub-nanometer channels of the neutral charge metal organic framework materials are used for lithium-magnesium separation.
Owner:TONGJI UNIV