The manufacture of Cadmium oxide nanoparticles utilizing a green method is the subject of this research (environmentally friendly). Using the tomato leaf plant's aqueous extract. Using an adsorption batch technique, this oxide was employed to remove tincturepaea-Phenylenediamine from its aqueous solutions. To describe and study the surface, several techniques such as FT-IR, XRD, SEM, TEM, and AFM were applied. All of the reflection peaks with relative intensities of different planes, as determined by XRD analysis, indicate the existence of CdO, and the spectrum revealed that the particle size obtained was around (48.28 nm), which corresponded to those estimated by SEM and TEM. The sizes of the CdO particles were measured using SEM, TEM, and AFM, and they were found to be in the nanoscale range. The influence of contact time, adsorbent, and other variables the thermodynamic parameters for the influence of temperature were calculated after studying the dosage and beginning concentration. And the effect of the change in the acidity function, as well as the effect of increasing the temperature. Through the results, it was found that the best adsorption occurred at a time of 90 minutes and at a quantity of (0.2 g) of the adsorbent substance, as well as at the (PH = 5) the adsorption rate was at its best and at a temperature of (338 K). Recorded the best adsorption rate Among the results obtained when applying the Langmuir and Freundlich isotherms, the adsorption processes were of a physical nature.