Razieh Sahraei, Mousa Ghaemy Polymer Research Laboratory, Department of Chemistry, University of Mazandaran, Babolsar, Iran The objective of this work is the preparation of effective magnetic biosorbent beads with the high surface area from a low-value abundant biopolymer (Katira, GT) and graphene oxide (GO) for the removal of dyes from the water. For this aim, magnetic hydrogel beads based on poly(vinyl alcohol)/poly(2-Acrylamido-2-methyl-1-propanesulfonic acid-co-1-vinyl imidazole)-g-gum tragacanth/graphene oxide were prepared by instantaneous gelation method in boric acid solution followed by cross-linking with glutaraldehyde (GA). The prepared magnetic beads with good mechanical stability (97.18%) were used as an effective adsorbent for removal of both cationic (crystal violet, CV) and anionic (congo red, CR) dyes from aqueous solution. The specific surface area and average pore diameter of magnetic beads (with a spherical shape and an average diameter of 3.0 mm) was 283.84 m2/g and 4.2767 ᵒA, respectively. The total pore volume was 0.0303 mL/g and the porosity based on a skeletal density of 0.5 g mL was 0.0149 per gram of sample. The maximum adsorption capacities were found 94.0 and 101.74 mg g-1 for CV and CR, respectively. Therefore, advantages such as biocompatibility, easy preparation and separation, inexpensiveness, chemical stability, high adsorption, reusability, and having functional groups with dual activities make these magnetic beads attractive and broadly applicable in the removal of various pollutants simultaneously from water, wastewater, and for column applications [1-3]. 1.Zhang Y, Liu Y, Wang X, Sun Z, Ma J, Wu T, Xing F, and Gao J, Carbohydr. Polym., 101, 392-400, 2014. 2.Jiang W, Wang W, Pan B, Zhang Q, Zhang W, and Lv L, ACS Appl. Mater. Interfaces, 6(5), 3421-3426, 2014. 3.Pour Z.S, and Ghaemy M, RSC Adv., 5(79), 64106-64118, 2015. |