الفهرس 
MATERIALS PREPARATIONSOnly 14 pages are availabe for public view
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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