Characterization and Cu(II) adsorption properties of activated carbons prepared from cotton stalk by one-step H3PO4 activation.

Characterization and Cu(II) adsorption properties of activated carbons prepared from cotton stalk by one-step H3PO4 activation.

Pierre Gerard TCHIETA, NKANA NKANA Gilbert Romeo, Charles Melea KEDE*
Bio-organic, Analytical and Structural Chemistry Laboratory, Faculty of Science, University of Douala; BP 24157 Douala, Cameroon

International Research Journal of Materials Sciences and Applications

In the present study adsorption of copper (II) ions from aqueous solution by activated carbon was produced from cotton stalks husk via thermal pretreatment preceding chemical modification with phosphoric acid was investigated under batch mode. The biosorbent was characterized by thermo-gravimetric analysis, Fourier transform infrared (FT-IR) and iodine number. The influence of copper concentration, contact time, and temperature was studied. Sorption equilibrium time was observed in 30 min. The equilibrium adsorption data were correlated with Freundlich and Langmuir adsorption isotherm models. The kinetics of the adsorption process was tested by pseudo- first-order, pseudo-second order and Intra-particle diffusion. It was shown that adsorption of copper could be described by the pseudo-second order kinetic model. Thermodynamic parameters such as Gibbs free energy (∆G0), the enthalpy (∆H0) and the entropy change of sorption (∆S0) have also been evaluated and it has been found that the adsorption process was spontaneous, feasible and endothermic in nature. The results indicated that Activated carbon was produced from cotton stalks husk can be used as an effective and low-cost adsorbent to remove copper (II) from aqueous solution.

Keywords:Heavy metals, adsorption, isotherms, kinetics, thermodynamics.

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How to cite this article:
Pierre Gerard TCHIETA, NKANA NKANA Gilbert Romeo, Charles Melea KEDE. Characterization and Cu(II) adsorption properties of activated carbons prepared from cotton stalk by one-step H3PO4 activation. International Research Journal of Materials Sciences and Applications, 2018; 2:8. DOI:10.28933/ijmsa-2018-04-2601


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