Preparation of poly(vinyl pyrrolidone) grafted sulfonamide based polystyrene resin and its use for the removal of dye from water

Poly(vinyl pyrrolidone) was grafted onto crosslinked polystyrene beads through the 2-chloroethyl sulfonamide (CSA) groups present in the resin using the atom transfer radical polymerization (ATRP) method. A beaded polymer with a poly(vinyl pyrrolidone) surface shell was prepared in three steps, starting from polystyrene-divinylbenzene (10% crosslinking) based beads with a particle size of 420-590 μm, according to the synthetic protocol; chlorosulfonation, sulfamidation with 2-chloroethylamine hydrochloride and grafting reaction of poly(vinyl pyrrolidone). The polymeric resin prepared with the described procedure with 72.66% of grafted poly(vinyl pyrrolidone) has also been demonstrated to be an efficient dye sorbent, able to remove dye from water even at ppm levels. The dye sorption capacity under non-buffered conditions is around 0.65 g dye/g resin.