Preparation of Raw Oyster Shell For Adsorption of Methyl Red Dye In The Aqueous Solution.

The raw oyster shell was successfully prepared as an adsorbent for removal of Methyl Red (MR) dye. Adsorption studies were carried out for removal of MR dye from aqueous
solution by varying the adsorption parameters such as adsorbent size, adsorbent dosage, initial dye concentration, contact time, pH, agitation speed and agitation time. Optimum conditions for adsorption of MR dye were obtained at 75 μm of adsorbent size with 0.3g of adsorbent dosage at 2 h as contact time. Initial dye concentration at its optimum
level, were found to be 100 mg/L working efficiently at pH 3 and agitation rate of 110 rpm. Orbital shaker was used to reduce the time consumption during the adsorption process and it gives the positive result when the contact time can be reduce from 2 hours to 45 min after process of agitation. The removal efficiency was found out to be 99.2% and this result shows that raw oyster shell has great potential in removing of MR dye from aqueous solution. The experimental data obtained were best fitted by Freundlich isotherm model than Langmuir isotherm model and this define heterogeneous adsorption mechanism of adsorbent.