Preparation of Raw Oyster Shell for Adsorption of Methyl Orange Dye in Aqueous Solution

The development of oyster culture in Peninsular Malaysia nowadays is increasing well due to high demands of oyster from restaurants and hotels especially in tourist spot.
However, there is bad consequence through this development which is irresponsible disposal of waste oyster shell to certain areas that create new problems such as delivering
an intense scent and pollute surrounding environment. This problem need to be resolved using a creative solution by turning the shell waste into something beneficial and useful. Besides, another problem is to remove dye that has been discharge by industries into water through adsorption technique. The raw oyster shell was successfully prepared as an adsorbent for adsorption of methyl orange dye in aqueous solution. Study on adsorption were carried out for removal of MO dye by varying adsorption parameters such as adsorbent size, adsorbent dosage, initial dye concentration, contact time, pH,agitation speed and agitation time. Based on results, the optimum parameters for the removal of MO dye is using 1.0 g of 75 μm of adsorbent particle size with initial dye concentration of 150 mg/L in acidic condition of pH 3 in 130 rpm agitation speed for 1 hour. Raw oyster shell has great potential in removing MO dye from aqueous solution because it recorded 98.39% of percentage removal. The experimental data obtained were best fitted by Langmuir isotherm model than the Freundlich isotherm model and this prove that monolayer adsorption had happen at specific homogenous site of adsorbent.