The ability of Terminalia Catappa Linn carbon to remove malachite green from aqueous solutions has been studied for different adsorbate concentrations by varying the amount of adsorbent, temperature, pH and shaking time. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG°, were calculated from the slope and intercept of the linear plots of lnK0 against 1/T. Analysis of adsorption results obtained at 303, 313, 323 and 333 K showed that the adsorption pattern on Terminalia Catappa Linn carbon seems to follow the Langmuir and Freundlich. The temperature increase reduces adsorption capacity by Terminalia Catappa Linn carbon, due to the enhancement of the desorption step in the mechanism. The numerical values of sorption free energy indicate physical adsorption. The kinetic data indicated an intraparticle diffusion process with sorption being first order. The concentration of malachite green oxalate was measured before and after adsorption by using UV-Visible spectrophotometer.