UTILISING THE PODS OF DELONIX REGIA ACTIVATED CARBON FOR THE REMOVAL OF MERCURY(II) BY ADSORPTIONP.S.SYED SHABUDEEN, R. MAHALAKSHMI AND R. SIVAHARIAbstract Adsorption studies of Mercury (II) from aqueous solution on the pods of Delonix regia activated carbon were investigated under the varying conditions of agitation time, metal ion concentration, adsorbent dose, pH and particle size. The activation is carried out by different methodologies, Pyrolysis activation, Sulfuric acid activation, Calcium chloride activation, Ammonium carbonate activation, Sodium sulphate activation, Sulfuric acid with ammonium per sulphate activation. The characteristic of this activated carbon was determined. In which the Sulphuric acid activated carbon is employed for this adsorption studies. In this adsorption studies, the adsorption equilibrium reached in 150 min for 10, 20, 30 mg/L of Hg (II) concentration. Adsorption followed Langmuir isotherm. The per cent removal increased with increase in pH from 2 to 5 remains static from pH 5 to 10. The efficiency of particle size was also performed which showed the minimum particle size was found to be effective. Desorption studies were performed with dilute sodium hydroxide solution.
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