Fabrication of nano-graphene oxide assisted hydrotalcite/chitosan biocomposite: An efficient adsorbent for chromium removal from water

Add time:07/20/2019    Source:sciencedirect.com

Recently, nanomaterials based adsorbents play a prominent role in the removal of toxic ions from aqueous solution. Hence in the present study, nano-graphene oxide (n-GO) fabricated hydrotalcite ([email protected]) composite was prepared by hydrothermal method for chromium removal. To improve the mechanical strength and chromium removal capacity, [email protected] composite was reinforced with chitosan (CS) to form hybrid composite namely [email protected] biocomposite. The synthesized biocomposite was characterized using various instrumental techniques like FTIR, SEM, TEM and EDAX with mapping analysis. To get the maximum chromium retention, the various sorption experiments like agitation time, dosage, pH, competing ions and temperature were optimized. The sorption capacity (SC) of [email protected] biocomposite was found to be 42.64 mg/g within 50 min. The obtained equilibrium data was explained with Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherms wherein the chromium sorption process was best fitted with Langmuir isotherm. The thermodynamic results prove that the chromium sorption of [email protected] biocomposite was endothermic and spontaneous. The chromium sorbed [email protected] biocomposite could be easily regenerated with 0.1 M NaOH. The synthesized [email protected] biocomposite was also utilized in the field conditions.

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