Madhumita Sharma’s research while affiliated with Dr. B. R. Ambedkar National Institute of Technology Jalandhar and other places

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Publications (1)

a–e Optimization graph for maximum percentage swelling a reaction temperature (40–80 °C), b reaction time (5–10 h), c backbone ratio (CH: KCG; 4:1–1:4), d amount of β-CD (0.03–0.05 mol/L) in biosorbent, e amount of solvent (13–21 mL), and e pH of the solution (2–11)
a Combined FTIR spectra of CH, KCG, CH/KCG, and CH/β-CD/KCG. b Combined XRD pattern of CH, KCG, CH/KCG, and CH/β-CD/KCG. c FESEM images of CH, KCG, CH/KCG, and CH/β-CD/KCG. d EDS spectra of CH, KCG, CH/KCG, and CH/β-CD/KCG
a–e: a Effect of a concentration of dye (10–50 ppm), b pH (2–11), c temperature (20–60 °C), d adsorbent dose (0.05–0.3 g), and e contact time (60–300 min) on percentage removal of acid fuchsin dye
a–d Plots of kinetic models for the adsorption of AF dye on the CH/KCG biosorbent: a pseudo-first-order, b pseudo-second-order, c intraparticle diffusion, and d Elovich model; e–h plots of kinetic models for the adsorption of AF dye on the CH/β-CD/KCG biosorbent: e pseudo-first-order, f pseudo-second-order, g intraparticle diffusion, and h Elovich model
a–d Isotherm models: a Langmuir isotherm, b Freundlich isotherm, c Elovich isotherm, and d Temkin isotherm; e Arrhenius plot, and f thermodynamic plot of adsorption of AF on CH/KCG and CH/β-CD/KCG biosorbents; reusability plot of efficiency of g CH/KCG and h CH/β-CD/KCG biosorbents for removal of AF

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β-Cyclodextrin modified chitosan and κ-carrageenan composites for acid fuchsin dye removal: mechanism insight and adsorption performance
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June 2024

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Madhumita Sharma

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Rajeev Jindal

This study is aimed at developing a highly effective adsorbent by physically crosslinking chitosan (CH), kappa-carrageenan (KCG), and β-cyclodextrin (β-CD) for removing acid fuchsin (AF) dye from water. Various analytical techniques, such as PXRD, FTIR, FE-SEM, and EDS, were utilized to analyze the interactions and morphology of the crosslinked biosorbents. The adsorption performance of CH/KCG and CH/β-CD/KCG biosorbents was assessed under diverse reaction conditions. The adsorption capacity increased with agitation time, reaching equilibrium at 240 min for CH/β-CD/KCG and 300 min for CH/KCG. CH/β-CD/KCG demonstrated the highest adsorption capacity among the two adsorbents studied. The maximum adsorption efficiencies were found to be 9.979 mg/g for CH/KCG and 10.98 mg/g for CH/β-CD/KCG biosorbents under neutral pH and at 30 °C (optimum temperature). Comparing CH/KCG with CH/β-CD/KCG, a notable increase of approximately 13.6% in AF adsorption was observed. Kinetics revealed a pseudo-second-order mechanism, and isotherm models suggested monolayer adsorption following Langmuir isotherm. Thermodynamic analysis indicated a low temperature, spontaneous, and exothermic adsorption process. The activation energy values were calculated as 47.515 and 18.269 kJ/mol for CH/β-CD/KCG and CH/KCG, respectively, indicating physical interactions as the driving force for adsorption. Acid fuchsin adsorption was primarily attributed to physical interactions and hydrogen bonding, facilitated by polymer and inclusion formation mediated by β-CD through host–guest interactions. Furthermore, the biosorbents showed remarkable reusability after three cycles of adsorption and desorption, indicating their promising potential as natural biosorbents for the removal of cationic dyes. Graphical Abstract

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