الفهرس | Only 14 pages are availabe for public view |
Abstract Thorium is a dangerous and radioactive substance for the environment. In contrast to uranium, thorium is employed as a fuel source in nuclear power reactors. A functionalized sulfosuccinic acid on polyvinyl alcohol/polyamide (SSA/PVA/PA) and polyvinyl alcohol/polyamide functionalized with pyridine dicarboxylic acid (PDA/PVA/PA) are new, highly efficient, cheap sorbents to remove it from solutions and wastewater. A variety of analytical techniques, including XRD, SEM-EDX, FTIR, BET, TGA, and XPS, confirmed the improved physical and chemical properties of the PDA/PVA/PA and SSA/PVA/PA poly-adsorbents. The optimum adsorption is attained at pH 3.5, 60 and 50 mg for 60 and 75 min of PDA/PVA/PA and SSA/PVA/PA, respectively at ambient temperature. The Th(IV) maximum loading capacities on PDA/PVA/PA and SSA/PVA/PA are 107.71, and 142.11 mg/g, respectively. The optimum desorption conditions from the loaded adsorbent (Th/PDA/PVA/PA) were 1.5 M sulfuric acid, solid/liquid ratio 1/60 for 45 minutes at ambient temperature while the desorption conditions of thorium ions from Th/SSA/PVA/PA are 1.25 M sodium carbonate in the existence of sodium malonate, solid/liquid ratio 1/50 for 60 minutes at ambient temperature. After six successive sequences, desorption effectiveness for the Th(IV) from Th/PDA/PVA/PA dropped from 97.4% to 83% while desorption effectiveness for the Th(IV) from Th/PDA/PVA/PA dropped from 97.4% to 83%. 1 g of PDA/PVA/PA or SSA/PVA/PA poly-adsorbents was applied to remove thorium from 1 L of waste solution from the Nuclear Materials Authority nearly all Th(IV) were found to be adsorbed by PDA/PVA/PA or SSA/PVA/PA, with an |