The adsorption of dibutyl phthalate from aqueous solution using phoenix leaves activated carbon by chemical activation with phosphate was investigated. After Scanning electron microscopy, Energy dispersive X-ray spectrometry, Brunauer-Emmett-Teller and Infrared spectrum characterization of phoenix leaves activated carbon, the influences of solution pH, contact time, initial dibutyl phthalate concentration and temperature on the adsorption rate were investigated. The isotherm, kinetic and thermodynamic parameters were explored to describe the experimental data. The phoenix leaves activated carbon has a heterogeneous distribution of grain and a well-developed porous structure. The main elements of phoenix leaves activated carbon are 24.26 % carbon, 70.65 % oxygen and 3.75 % phosphor. The Brunauer-Emmett-Teller surface area of the sample is 593.52 m2/g with the average pore diameter of 6.31 nm. The single point total pore volume was found to be 0.52 cm3/g. The infrared spectrum showed the complexity of the material. The maximum dibutyl phthalate adsorption rate was 97.36 % and the maximum adsorption capacity was 48.68 mg/g at pH 13. The monolayer sorption capacity of the biosorbent for dibutyl phthalate was found as 133.33 mg/g with the Langmuir isotherm. The equilibrium data fitted with Freundlich isotherm better than Langmuir, Dubinin-Radushkevich and Temkin isotherm. The kinetic data was best described by the pseudo-second order model better than pseudo-first-order kinetic, intraparticle diffusion and Elovich model. The thermodynamic studies indicated that the sorption process spontaneous, thermodynamically favorable and endothermic. The phoenix leaves activated carbon can be an alternative material for treatment of dibutyl phthalate wastewater.