Study of Lead Removal from Polluted Water by Types of Adsorbents Made from the Canola Stalk

Due to pollution in nature by lead (Pb), the canola stalk (CS) and water vapor-activated biochar (BC) adsorbents were utilized to remove lead from polluted solutions in the lab. The water vapor-activated biochar adsorbent was prepared in 500-degree Celsius carbonization temperature and 700-degree Celsius activation temperature. Lead adsorption isotherm experiments were carried out in 25 degrees Celsius. Experiments were performed to determine the best adsorbent pH level and the best adsorbent dosage level. Both CS and BC adsorbents were amended with magnetic iron oxide nanoparticles (Fe3O4) at 5% (w/w), and the lead adsorption isotherm experiments were carried out using the new adsorbents. The results indicated that the water vapor-activated biochar adsorbent modified with Fe3O4 (BC-5%) is the best adsorbent for the lead pollutants removal. In this adsorbent, the maximum of adsorbed quantity was found equal to 63.62 mg g-1, the Langmuir constant was obtained equal to 0.06790 L mg-1, coefficient of determination was computed equal to 0.9798 and standard error of the estimate acquired equal to 3.219.