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Schematic representation of the preparation process of ion-imprinted PP fibers (IPAT) (i: plasma treatment of PP fibers to form radicals; ii: grafting of acrylic acid (AA) on PP fibers to form AA-grafted PP (PA); iii: amidation of AA with triethylene tetramine (TETA) to form PAT; iv: imprinting of Cr(VI) template and crosslinking; v: elution of Cr(VI) template using a NaOH solution).
