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The efficiency of synthesized polyaniline (PANi) with the presence of coir in sulfuric acid medium and ammonium persulfate as oxidizing agent varies from 83.20 to 92.00%. The obtained polyaniline/coir material was used for adsorption of dichloro diphenyl trichloroethane (DDT)-a pesticide which has been used and still causing serious pollution problems. The adsorbent efficiency is 77.00% corresponding to adsorptive capacity 47.65 mg/g at room temperature.