| Abstrakt: |
In recent years, there has been rising interest in developing green biocomposite for industrial wastewater treatment. In the current research work, the novel hydrogel composite of methylene bisacrylamide (MBA) crosslinked chitosan (CS)-silica (Si)–g–acrylamide (AM)/orange peel (OP) was synthesized and its ability as an adsorbent has been tested through batch and column adsorption of Cr(VI) ion. FT-IR study of MBA crosslinked hydrogel composite sorbent showed the presence of –OH, –C = O, and –COOH groups. XRD and SEM studies represent an amorphous nature and rough surface with a porous structure. Under batch adsorption studies, the optimum conditions for Cr(VI) adsorption were obtained as pH 6, dosage 4 g, contact time 240 min, and metal ion concentration (62.5 mg/L) with high removal efficiency. In addition, the higher R2 values indicate favourability of Freundlich adsorption isotherm and pseudo-second-order kinetics. Column parameters showed a 1-mL flow rate, 100-ppm initial concentration, and 3cm bed height as the optimum conditions to remove Cr(VI) ions from synthetic wastewater. The column kinetic study reveals a better fit of the Thomas model with a higher R2 value. [ABSTRACT FROM AUTHOR] |
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