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Abstract
Batch adsorption studies were conducted to investigate the potential of pine bark subjected to three different pretreatments (washing with hot water, Soxhlet extraction and formaldehyde treatment) to remove the cationic dye methylene blue from water. Experimental adsorption isotherms showed that all three pretreated bark adsorbents demonstrated considerable capacities for methylene blue. The simple Langmuir isotherm model was found to exhibit good fit to the isotherm data. The best uptake was observed using the bark adsorbent pretreated with Soxhlet extraction. The maximum dye uptake obtained was 115 mg/g. Adsorption of methylene blue was a slow process and reached apparent equilibrium after a contact time of 6 h. The kinetic data could be adequately described by a mathematical model predicated on the kinetic form of the Langmuir isotherm model.