One-pot solvothermal synthesis of Carboxylatopillar[5]arene-modified Fe3O4 magnetic nanoparticles for ultrafast separation of cationic dyes

Abstract Carboxylatopillar[5]arene-modified Fe 3 O 4 magnetic nanoparticles (CP5-MNPs), with highly controllable particle size distribution, are successfully prepared through a newly developed one-pot solvothermal strategy for the first time. Due to the strong supramolecular host-guest interactions in conjunction with appreciable magnetic responsiveness, CP5-MNPs show excellent adsorption performance and ultrafast adsorption efficiency in the separation and enrichment of organic cationic dyes, including but not limited to methylene blue and crystal violet. Significantly, the excellent dye separation performance of CP5-MNPs demonstrates a strong tolerance towards pH changes and a good resistance to inorganic salts interference. The materials' inherent features of easy recyclability and affordability endow them with great potentials in column adsorption filler for sewage regeneration and environmental purification.