Adsorbable organic halide (AOX) compounds known with their toxic effect, produced as by-product for drinking water disinfection. The present work studied the removal of pentachlorophenol (PCP) as a model AOX compound in water. The use of a locally prepared date-pit activated carbon (DPAC) as adsorbent of pentachlorophenol from aqueous solutions was examined over pH range (2-11) and at different temperatures 25, 35, 45 and 55˚C. Langmuir, Frendulich, Temkin and Redlich-Peterson isotherm models were tested for modeling the adsorption isotherm at equilibrium. date-pit activated carbon examined by Elemental Analysis and FTIR.