Synthesis of neodymium doped polymer composite and its use for dye removal

In this study, firstly, poly(Aam-co-N-VI)/Nd polymer which is used as a new adsorbent with hydrogel properties was synthesized by free radical in-situ polymerization method. Brilliant yellow removal performance of this polymer from wastewater was investigated. Structure elucidation of hydrogel was performed by Fourier transform infrared spectroscopy (FT-IR). Surface morphology of adsorbent was investigated by scanning electron microscope (SEM-EDX) method and atomic and molecular structure was investigated by X-ray diffraction spectrum (XRD). Brilliant yellow adsorption efficiency was investigated in batch system by investigating variables such as adsorbent material amount, initial brilliant yellow concentration, temperature and contact time. The highest adsorption capacity was obtained as 183.68 mg/g at the initial brilliant yellow concentration of 150 mg/L, the dosage of 0.08 g/100 mL poly (Aam-co-N-VI)/Nd, the natural pH of the solution (9.45) and the temperature of 45 °C. The adsorption process followed the Langmuir isotherm and pseudo-second-order kinetics with internal diffusion as one of the rate determining steps. The adsorption process was found to be endothermic and spontaneous. The central composite design (CCD) in the response surface methodology (RSM) was used to determine the interaction effects of the selected parameters on the adsorption process and to optimize the adsorption efficiency of the process. ANOVA analysis based on central composite design-response surface methodology (CCD-RSM) showed that there was a good agreement between the second-order model prediction and the experimental values, resulting in an R2 value of 0.9350. According to the numerical optimization results performed with Design-Expert software, the maximum removal efficiency was found to be 99.13% for 0.08 g/100 mL poly(Aam-co-N-Vl)/Nd amount, 81.68 mg/L initial brilliant yellow concentration and 61.73 min reaction time. The experimental results obtained showed that the poly(Aam-co-N-VI)/Nd hydrogel was effective in removing brilliant yellow dye from aqueous medium at a high rate.