Abstarct: Pine cone, as an abundant agricultural waste with low cost, was modified using MIL 100 (Fe), and subsequently characterized by the Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD), techniques. The potential application of the modified adsorbent for the simultaneous removal of cationic and anionic dyes (methyl orange (MO) and methylene blue (MB)) was investigated. The effects of the experimental parameters such as the initial pH, adsorbent dosage, initial dye concentration, and contact time on the adsorption efficiency in the single solutions and their binary mixture was studied. The results of data analysis showed that the Langmuire isotherm can satisfactorily explain the equilibrium data for the MB and MO dyes . The maximum adsorption capacity (qm) for MO and MB in their binary mixture solutions was found to be 79.62 and 341.2 mg/g respectively at 0.20 g L-1 of adsorbent، pH 5.40 ( corresponding to the pH of the natural aqueous solution) and tempature of 298 K, whereas for MB and MO these values in their single solutions was found to be 227.27 and 39.37 mg/g, respectively. The kinetic studies revealed that this bio-sorption is a chemisorption process. In the part related to determining thermodynamic parameters, according to the value of ∆G° and its negativity, the spontaneity of the adsorption process is confirmed.The Positive values of ∆H° and ∆S° confirmed that the adsorption process is endothermic and irregularity increases at the solid-liquid interface. Also absorbent recovery studies were performed to evaluate the potential for adsorption reconstruction using Hcl, ethanol and dishwashing liquid. baxsed on these findings, the composite (pine cone @ MIL100(Fe)) can used as a low-cost, environmentally friendly and effective adsorbent for water treatment.