Adsorption of 4-Chloro-2,5-Dimethoxy Nitrobenzene by Activated Pyrolytic Char from Pine Sawdust

The adsorption studies of 4-chloro-2,5-dimethoxy nitrobenzene (CDNB) from aqueous solution on pyrolytic char activated by ammonium dihydrogen phosphate from pine sawdust have been performed. Several experimental parameters like initial pH, NaCl concentration, contact time solution temperature were evaluated. Solution pH within 2-7 is favor of adsorption and it is advantage of adsorption at higher temperature. Langmuir, Freundlich and Temkin isotherm models were used to fit the experimental data and Temkin model was better. The adsorption capacity was up to 33.8 mg·g1 at 323 K. The process is spontaneous and endothermic and physical action is major mechanism.