In this paper, the adsorption of Acid Yellow 36 (AY36), and Acid Red 73 (AR73) onto Pine Cone (PC) was investigated in aqueous solution in a batch system with respect to initial dye concentration, pH, contact time, temperature, inorganic anions (salt) and biosorbent doses at 25 oC. Surface studies of PC were investigated by Fourier transform infrared (FTIR). Studies of dye concentration and salt effects exhibited that dye removal percentage by PC was decreased. The results indicated that acidic pH supported the adsorption of this dyes by PC. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. The experimental data fitted well to the pseudo-second - order kinetics model for both dyes. Equilibrium isotherms were analyzed by Langmuir and Freundlich adsorption models. It was found that the isotherm data of AY36 and AR73 followed langmuir and Freundlich isotherms, respectively. Effective desorption of dyes were showed that adsorption of dyes on PC is physical process. The results indicate that PC could be employed as effective biomaterial for the removal of dyes from textile wastewater.
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