Nivaydita Dagar’s research while affiliated with Dr. Ambedkar Institute of Technology and other places

This study reports the microwave synthesis of Guar gum (GG) and Carboxymethyl cellulose (CMC) based hydrogel covalently crosslinked using epichlorohydrin (epi), aiming to remove hazardous dyes like Crystal Violet (CV) and Brilliant Green (BG). The optimized parameters were the reaction time (40 s), solvent (12 ml), pH (11), the ratio of reactants (GG: CMC, 1 : 2), and crosslinker concentration (0.8 ml) resulting in the highest percentage of swelling (4215 %). The synthesized hydrogel was characterized by different techniques like FTIR, TGA, FESEM/EDX, and XRD. The adsorption ability of the synthesized hydrogel was assessed for the removal of toxic dyes. Different kinetic and isotherm models were used to evaluate the type of adsorption that occurred on hydrogel materials. The CV and BG were both removed in 96.78 and 94.01 % of the adsorption process, respectively. The pseudo‐second‐order kinetic model is the best‐fitted model for the adsorption of dyes on the synthesized hydrogel. Adsorption was determined to be homogeneous and physical adsorption, and it was revealed through adsorption isotherm studies that the Langmuir model was the best‐fitted model. The adsorption process for both dyes is spontaneous, as further confirmed by the negative values of the change in Gibbs free energy from 298 to 318 K. The synthesized hydrogel material was discovered to be a promising adsorbent to remove these toxic dyes from wastewater and can be used as an eco‐friendly and sustainable material for wastewater remediation

The present study explained complete investigation for the adsorption properties of chemically cross linked hydrogel based on sodium alginate (NaALG) and carboxymethyl cellulose (CMC). The structural characteristics of the investigated hydrogel were described using information from FT‐IR spectra, XRD patterns, and FESEM pictures. The synthesized NaALG/ECH/CMC hydrogel was synthesized under optimized condition with respect to swelling percentage. Various reaction parameters were varied in order to get the maximum percentage swelling. The synthesized hydrogel was taken as adsorbents in the decolorization of Brilliant green (BG) and Safranin‐O (SO) dyes from water. According to the kinetic investigations, the decolorization equilibrium of SO by NaALG/ECH/CMC was discovered in 4 hour (98.98 %), while the removal of BG by NaALG/ECH/CMC took 6 hour (97.7 %). Chemical processes were used to describe the decolorization mechanisms, which significantly supported Pseudo first order model. NaALG/ECH/CMC hydrogel absorption was indicated to take place in monolayer adsorption form (Langmuir Isotherm). The highest adsorption capacity for BG was discovered to be 864.8 mg/g and for SO was 193.1 mg/g by synthesized hydrogel where 'mg' refers to commercial colorant, not pure dye. Therefore, the synthesized hydrogel can be considered as smart device for the adsorption of dye in water purification tasks.