Removal of diazo-dye Direct Blue 2 (DB2) in aqueus solution by P(HEMA) nanoparticles

In this work, the adsorption of diazo-dye Direct Blue 2 (DB2) in aqueus solution were worked by poly(hydroxyethyl methacrilate) [P(HEMA)]. The effect of pH, temperature, initial dye concentration and contact time to adsorption were investigated. Under optimum conditions, 50 mg/mL initial dye concentration and 2 mg of polymer were used and removal of dye was obtained as 89.1 % . To understand the adsorption mechanism, Langmuir, Freundlich and Sips (Langmuir-Freundlich) isotherm constants were calculated. According to the data obtained, it was reported that the adsorption was suitable for Langmuir isotherm model (R2: 0.993, Qmax: 27.1 mg/g). Concentrations of dye were measured before and after adsorption by UV-Vis spectrophotometer, polymer was characterized by FTIR and SEM before and after adsorption