Preparation of raw oyster shell for removal of coomassie brilliant blue R-250 dye from aqueous solution

Abstract

The removal of dye from textile wastewater effluent has become an important process nowadays. In this study, raw oyster shell was used as adsorbent for removal of Coomassie Brilliant Blue R-250 (CBB) dye by using the adsorption method in order to reduce the amount of waste oyster shells in waters and landfills which can cause pollution. Various parameters such as adsorbent size, adsorbent dosage, initial dye concentration, contact time and pH were investigated to study the potential of oyster shell as an adsorbent. The optimum adsorption was obtained at adsorbent size of 75 µm and 2.3 g of adsorbent dosage at 50 mg/L concentration of CBB dye. Optimum contact time of the dye adsorption was determined at 9 hours and the most effective condition for CBB dye removal was at pH 2. The removal efficiency was achieved at 99.64%. Thus, this study shows potential as an economical and environment friendly dye removal process for wastewater treatment.