Lalitha, PRenugadevi, N2017-02-152017-02-152011https://ir.avinuty.ac.in/handle/avu/1396in the present study the efficiency of the carbon adsorbent prepared from the Cassia fistula seeds was tested for the removal of malachite green dye from aqueous solution. The parameters, such as pH, adsorbent dosage and initial dye concentration were systematically evaluated. It is an N- methylated diaminotriphenyl methane dye widely used for colouring purpose and highly cytotoxic to mammalian cells. The percentage removal of malachite green increased with concentration of the dye solution. Nearly 40% adsorption was noted at pH 10 in 180 min of contact time at initial concentration of 4 0 0 mg/L with 3 0 0 mg of the low-cost adsorbent. Removal of malachite green increased from 2 4 .0 5 to 2 8 .2 3% with increasing adsorbent dosage from 3 0 0 to 600 mg in 180 min of agitation time, using 100 mL of dye solution of initial concentration of 4 0 0 mg/L. Langmiur adsorption isotherm plots and Freundlich adsorption isotherm plots were linear showing the applicability of the isotherms for malachite green adsorption.