Abstract
Raw oyster shell was successfully prepared as an adsorbent for removing Congo Red (C.R.) dye in an aqueous solution using an adsorption technique. The various parameters influencing this adsorption process, such as adsorbent size, adsorbent dosage, initial dye concentration, contact time, pH, agitation speed and agitation time, were studied. The maximum percentage of dye removal of 96.3% was obtained at the optimised conditions of 75 μm of adsorbent size, 1.0 g of adsorbent dosage, 30 mg/L of initial dye concentration, pH 3, 110 rpm of agitation speed and 75 min of agitation time. The experimental data were analysed using two adsorption models, the Langmuir isotherm model and the Freundlich isotherm model. The adsorption data obtained well fitted for the Langmuir isotherm model indicate a monolayer adsorption reaction involved during the adsorption process. The result shows that raw oyster shells could be employed as a suitable alternative adsorbent to remove Congo red dye in an aqueous solution.Keywords: raw oyster shell, adsorption, congo red
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