Abstract
Abstract Cellulose based hydrogels are emerging adsorbents for treating aqueous pollutants due to their modifiable surface characteristics and superabsorbent properties. This study investigates the sorption of fluoride (F − ) on CMC-g-AMPS/Fe/Al composite hydrogel impregnated with activated charcoal. Statistically valid Plackett–Burman design of experiments was employed for determination of most significant factors affecting F − removal. The maximum defluoridation efficiency of metal oxide incorporated HG (CMC-g-AMPS/Fe/Al/AC) was found to be 84.67% at pH 6 at an initial F − concentration of 5 mg/L which is significantly higher compared to control HG (CMC-g-AMPS/AC). Analysis of variance (ANOVA) revealed the effect of pH followed by contact time as the most significant parameter (P value − removal. The experimental data fitted well with the Langmuir isotherm model, with the maximum F − adsorption of 67.114 mg/g. The modification mechanism and adsorption process on HGs were examined with equilibrium degree of swelling (EDS), FT-IR spectra, SEM, EDX and XRD analysis. Characterization analysis of CMC-g-AMPS/Fe/Al/AC HG confirms a parallel hydrolysis reaction on fibrous polycrystalline lattice along with the desired metal incorporation and higher gel strength making it an excellent anionic polymer with high F − binding capacity.
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