A new synthesis of adsorbans: Simultaneous adsorptipn of acidic dyes from aqueous solutions

In this thesis study; a cross-linked polymer (KR-1) was synthesized by radical copolymerization in the presence of GMA, MA monomers, DVB crosslinker and AIBN initiator. A polymer enriched with amine groups (KR-2) was prepared by modifying the anhydride and epoxy reactive groups in the cross-linked polymer with TEPA. Afterwards, a new Fe3O4 supported magnetic adsorbent (KR-2mag) was prepared by modifying this polymer in FeCl2.4H2O/FeCl3.6H2O aqueous solution and then precipitating it in basic medium. The prepared adsorbent was characterized by FTIR, XRD, FE-SEM, EDX, TG-DTA techniques; surface properties such as BET surface area, pore volume, pore wide, particle size and surface pHpzc were also determined. The usability of the KR-2mag adsorbent as an adsorbent in single and binary system adsorption of Tartrazine and RB-4 dyes in aqueous solutions was investigated. For this purpose, the effects of adsorbent amount, ambient pH, initial dye concentration, temperature and time on adsorption were examined and optimum adsorption conditions were determined in single and binary systems. Isotherm and kinetic evaluations were made, and also the nature of adsorption was determined by calculating thermodynamic parameters. In addition, the effect of ionic strength on the amount of adsorbed dyes was investigated by performing adsorption studies in a single and binary system in a dense matrix medium. From the characterization studies, it has been determined that the KR-2mag resin has basic character, semi-crystalline structure and high thermal stability; It was also determined that the surface properties were suitable for adsorption. RB-4.Adsorption capacity in a single system was 281 mg/g for Tartrazine, 297 for RB-4; in the binary system, it was calculated as 170 mg/g for Tartrazine and 184 mg/g for RB-4.