Uranium and iron sorption from synthetic phosphoric acid was carried out onto activated pistachio nut. This activated
carbon was modified by adding some functional groups which have great ability to attract uranium from its solution. The
different factors affecting uranium and iron adsorption have been investigated. The obtained results clear that, the sorption
preferred conditions were; solution pH of 3, shaking time of 60 min., room temperature, and adsorbent amount is 1g/L.
Based on kinetic modeling investigation, the sorption process of uranium and iron is following to pseudo-second order
mechanism. From the results, the uranium and iron sorption from synthetic phosphoric acid, with only about 3% loss of
P2O5, onto activated pistachio nut was found to occur through physical sorption process. The adsorption process has been
found to agree with the Langmuir isotherm and confirms with the concept of the matrix diffusion controls according to
Homogeneous Particle Diffusion Model (HPDM). `