Abstarct: In the first part of this thesis, palm waste was used to remove both lead and cadmium elements. At first, the waste was crushed as much as possible. Then the magnetic adsorbent was prepared using iron (П) and iron (Ш) salts. This adsorbent effectively eliminated lead ions and also largely eliminated cadmium ions, so the adsorption capacity for these two elements was 35.39 and 14.03 mg g-1, respectively. In the second part, walnut shell waste was used to prepare a magnetic adsorbent. Due to the good brittleness of walnut shell, this waste was powdered by ball mill before activation. Magnetic adsorbent was prepared after activation using NaOH 0.1 M solution using iron (П) and iron (Ш) salts and this sorbent was used for removal of lead. Finally, after examining the parameters affecting the removal rate of the ions, isotherms and adsorption kinetics were investigated. The results showed that the adsorbent was able to adsorb lead ions during 4.0 minutes with a maximum adsorption capacity of 27.58 mg g-1. The kinetics of adsorption also showed that the kinetics of the mextal adsorption process followed the pseudo-second order kinetics (R2 = 0.9999) the adsorbent recovery capability was also tested. The results of data analysis showed that the increase of surface area using ball mill has a great effect on increasing adsorption capability. Also, the results of adsorbent recovery showed that the prepared magnetic adsorbent retained its magnetic and removal capability after ten cycles of use. In the third part of this thesis, a magnetic adsorbent was prepared using walnut wood waste for removal of cadmium, nickel, and zinc mextals in single, binary and ternary systems. Adsorbent magnetization were performed with the same procedure as walnut shell magnetization. After investigation of the effect of different parameters on the amount of mextal removal, the isotherms were obtained using the Langmuir isotherm, and also the Linest function in the Excel software. Finally, the recyclability of adsorbent was investigated. The results showed that After 10 times utilization, the sorbent preserved its characteristics without losing its mextal removal and magnetic properties. Finally, in the last part of this thesis, the preparation of zeolite adsorbent was carried out using the natural source of stem sweep. Initially, XRF analysis of the ash obtained from the stem sweep, showed that it contains 80% silica that can be extracted to make zeolite. Therefore, the content of ash silica obtained from stem sweep was extracted. To prepare the magnetic adsorbent, Fe3O4 nanoparticles were synthesized separately. These nanoparticles were used together with sodium aluminate and extracted silica to synthesize magnetic zeolite. The effect of different variables on the synthesis of the adsorbent was investigated and optimized on the basis of optimum removal of the mextal ions and the amount of adsorbent obtained. This zeolite was used to remove lead and cadmium in single, and binary systems. The effect of conditions affecting the adsorption were assesesd and the isotherm and kinetic of adsorption process were also studied. The results showed that in single and binary systems, lead had the maximum adsorption capacity of 270.27 and 272.76 with R2 = 1.000 and R2 = 0.999, respectively. Maximum adsorption capacity of 112.36 and 57.91, with R2 = 0.9991 and R2 = 0.9752 was obtained for cadmium, respectively in single and binary systems. According to the results, it can be concluded that in the binary system containing Pb and Cd ions, the presence of Cd ions does not affect the adsorption of Pb ions. However, the presence of Pb ions has a decreasing effect on the Cd removal.