A new polyamide adjusted triazinyl-β-cyclodextrin side group embedded magnetic nanoparticles for bacterial capture

Abstract

A new β-cyclodextrin grafted on poly(isophthalamide)/magnetic nanoparticles (CDPA-MNPs) nanocomposite was prepared through magnetic nanoparticles (Fe₃O₄) embedding onto β-cyclodextrin groups grafted on polyamide via the simple one-pot co-precipitation of aqueous Fe²⁺/Fe³⁺ salts method. A new wholly aromatic polyamide was synthesized via the phosphorylation polyamidation reaction promoted by triphenyl phosphite (TPP) and tetrabutylammonium bromide (TBAB) as a green solvent and catalyst. Then monochlorotriazinyl-β-cyclodextrin (MCT-β-CD) was treated to aromatic polyamide via a nucleophilic substitution reaction and magnetic nanoparticles (MNPs), approximately 10 nm in diameter, immobilized on the polyamide. The co-presence of the hydrophilic CD molecules and MNPs were applied as an efficient novel nano-adsorbent for the physically removing of both Gram-positive Bacillus cereus (B. Bacillus) and Gram-negative Escherichia coli (E. coli) in water using an external magnet.