Removal of sunset yellow FCF from aqueous solutions using a highly cross-linked PDMA star polymer

The highly cross-linked PDMA star polymer (PDMA- b -PEGDMA) was successfully synthesized by group transfer polymerization (GTP) using 2-( N , N -dimethylamino)ethyl methacrylate (DMA) and cross-linking agent ethylene glycol dimethacrylate (EGDMA) monomers. Highly cross-linked polymer as a huge molecule has many functional groups. Thanks to these properties, dye adsorption performance of this kind of polymer was investigated. Sunset yellow FCF (SY) dye was used to determine whether the polymer showed adsorption properties. The effect of solution pH, dye concentration change and adsorbent amount on adsorption were investigated and the most effective adsorption conditions were determined for polymer. According to these parameters, the reaction rate constants in the dye adsorption of highly cross-linked polymer and the thermodynamic parameters (Δ H °, Δ G ° and Δ S °) of the adsorption were calculated. The reaction was spontaneous (Δ G °