Thin-Film Nanocomposite Membrane Based on Mineral Silicate Maifanite for Organic Solvent Reverse Osmosis

Modern industries usually require membrane separationtechnologiesto perform well in organic solvent systems; however, typical commercializedreverse osmosis (RO) membranes often suffer from swelling and instability.Herein, we proposed a "CCC" post-treatment method todirectly upgrade a traditional RO membrane and extend its potentialapplication in the deep purification of integrated circuit materials.This method combines inorganic maifanite particles and organic polymeradamantane structures, benefiting from the merits of inorganic andorganic materials, to successfully establish a stable mixed matrixmembrane (MMM) structure on a thin-film nanocomposite (TFN) membranesurface after the CCC post-treatment, involving conditioning, cross-linking,and curing. The as-prepared TFN membrane was characterized using Fouriertransform infrared spectroscopy, X-ray photoelectron spectroscopy,energy-dispersive spectroscopy, scanning electron microscopy, andatomic force microscopy and evaluated using organic solvent RO. Thisstudy offers a new perspective and an effective solution for the separationof inorganic salts from organic solvents. The as-prepared TFN MMMwas able to separate 99.1% of Li+, 96.8% of Ca2+, 96.9% of Zn2+, and 98.9% of Al3+ from anorganic solvent through simple dead-end filtration with a stable performanceand had a competitive capacity in the purification of lithium carbonate.