Original Articles
Ihab. A. Al-tameemi, Tarikak.
Abstract
Wastes of the Iraqi date dried Conocarpus erectus leaves was used to study remova l of heavy metal cations (Cd+2& pb+2) from simulated artificial waste water using batch adsorption process. The dried parts of the date Conocarpus erectus leaves, were grinded to ≤ 150 micro mater in size and used directly in differ ent adsorbent / metal ion ratios, starting with metal ion concentra tion of (100ppm). The adsorption efficiencies were found to be pH dependent, increasing by increasing the pH in the r ange from(3-9). Date Conocarpus erectus leaves suc ceeded to achieve 89.9% removal for Cd+2 ions & 95.1% for pb+ 2 ions within (60 min) contact time, at room temper ature. 25Co and pH value of (9).The removal order was foun d to be Pb (II) >Cd (II).This study is one of the f irst reports of removal of the highly toxic Cd2+ and Pb2+ in mixed systems based on the adsorption by natural material s. The thermodynamic parameters were given and showed that ∆H° was endothermic-positive value, ∆G° was found (a spontaneous process-negative value) and ∆S° was found positive value- increase of disorder o f the process. fuctional groups (C-O and C-N) identification were given using FTIR spectrophotoscopy