AQUEOUS PHASE ADSORPTION OF METANIL YELLOW ON PHOSPHORIC ACID-ACTIVATED CARBON PREPARED FROM GMELINA ARBOREA BARK

B.O. Isiuku, B. I. Nwabueze

Abstract


 Batch adsorption of Metanil Yellow on phosphoric acid-activated-carbon prepared from Gmelina arborea bark was carried out with the view to study the adsorptive capacity of the adsorbent. The Langmuir, Freundlich, Temkin isotherm models, as well as the Pseudo-first order and the Elovich kinetic models were used to simulate experimental data. Results showed that optimum equilibrium adsorption capacity, qe, was 34.238 mg/g by initial solution concentration 100 mg/L. Equilibrium adsorption capacity increased with increase in initial dye concentration. The isotherm models used were good fits with correlation coefficients, R2, generally above 0.98. The adsorption was controlled by liquid film diffusion. The point of zero charge pH of the carbon was 3.2. The Gibbs free energy of adsorption,( 0.294, 1.369 and 2.448 kJ/mol) for initial dye concentrations (25, 50, 100 mg/L), showed non-spontaneity of the adsorption. The RL and n (2.017) (from Freundlich model) values indicate favourable and physical process. The results show that Gmelina arborea bark is a potential precursor for activated carbon production.

Keywords: Batch adsorption, Gmelina arborea carbon, metanil yellow, modelling.


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Chemical Society of Nigeria