Abstract
Water purification is a significant approach to solve the serious global water shortage and pollution problems. Nanofiltration membranes assembled from two-dimensional layered materials have shown great potential in water purification. In this study, iron cage (Fe-cage) intercalated layered double hydroxide (LDH) composite membrane was formed on the surface of polyacrylonitrile ultrafiltration support through vacuum-assisted assembly strategy. Exfoliated LDH nanosheets obtained by solvothermal method were re-stacked with the intercalation of Fe-cage through the electrostatic interaction. The structure and chemical property of the nanochannels formed between the LDH nanosheets were tuned by Fe-cage. Therefore, the fabricated LDH/Fe-cage composite membranes possessed enhanced separation performance for the removal of dye and humic acid from water. In addition, the composite membrane exhibited a stable separation performance for a long-time running. These results indicated that this facile and effective method has an extensive potential in practical water purification process.
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