ADSORPTION PERFORMANCE OF ACID-ACTIVATED CARBON DERIVED FROM GMELINA ARBOREA IN BATCH REMOVAL OF METHYL VIOLET FROM AQEUOUS SOLUTION

B.O. Isiuku, J.C. Iwu, D. C. Emeagwara, F.C. Ibe

Abstract


 Gmelina arborea bark biomass is an agricultural waste from the timber industry. The biomass was used to produce chemically-activated carbon. The carbon was used to remove methyl violet from the aqueous phase by batch adsorption. The effects of initial solution pH, initial solution concentration oand adsorbent dosage were investigated at 28 C. Experimental data show that equilibrium adsorption capacity increased with increase in time and initial solution concentration but decreased with increase in adsorbent dosage. Optimum values of parameters obtained were 106 mg/g, 75 mg/L, 0.04 % and 10 for equilibrium adsorption capacity, initial solution concentration, adsorbent dosage and pH respectively.  Due to environmental friendliness, pH 8 was used. Dubinin-Radushkevich isotherm and pseudo-second order kinetic models fitted experimental data most. The adsorbent was microporous. The Freundlich n and Dubinin-Radushkevich E values show that the adsorption was chemisorption while the Temkin B value show physisorption to occur. The adsorption was non spontaneous and endothermic. Liquid film diffusion controlled the process. Higher temperatures might enhance the adsorption performance. Gmelina arborea bark is a potential biomass for activated carbon production.  


Keywords: Activated carbon, batch adsorption, Gmelina arborea bark, methyl violet, modelling


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Chemical Society of Nigeria