Synthesis and characterization of carbon/AlOOH composite for adsorption of chromium(VI) from synthetic wastewater

• Carbon reinforced AlOOH composite has been synthesized and characterized.
• The equilibrium and kinetics of Cr(VI) adsorption on carbon/AlOOH have been studied.
• Pseudo-second order and Freundlich model was best fitted to the adsorption data.
• The adsorption of Cr(VI) onto carbon/AlOOH was spontaneous and endothermic.

In this work, flake like carbon/AlOOH composite has been synthesized and evaluated as a new adsorbent for the removal of Cr(VI) from synthetic wastewater. Different characterization tools such as, SEM, EDAX, XRD and XPS were performed to characterize the composite material. Batch adsorption studies for Cr(VI) removal were performed under the influence of various operational parameters such as solution pH, contact time, initial solution concentration and temperature. Results obtained revealed that adsorption of Cr(VI) onto carbon/AlOOH composite followed the pseudo-second order kinetics and Freundlich isotherm model. Thermodynamic results suggests that adsorption of Cr(VI) onto carbon/AlOOH composite was spontaneous and endothermic in nature.

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