Effect of the Alkyl Chain Length on the Adsorption properties
of Malonamide Chelating Resins

Abstract:
In order to investigate the effect of the alkyl chain length of
malonamide chelating resins on the rate of uptake of U(VI) ions and Ce(III)
ions, N,N,N’,N’-tetraethylmalonamide (TEMA), N,N,N’,N’-tetra-npropylmalonamide
(TPrMA), N,N,N’,N’-tetra-n-butylmalonamide (TBMA)
and N,N,N’,N’-tetra-n-pentylmalonamide (TPeMA) chelating resins were
synthesized by chemically bonding these function groups to CMS-DVB copolymer
beads. N,N,N’,N’-tetraphenylmalonamide (TPhMA) chelating
resin was also investigated and the results of these resins were compared
with those of N,N,N’,N’-tetramethylmalonamide (TMMA) previously
reported. The batch technique was used to study the thermodynamic
equilibrium, in terms of distribution coefficient, and the kinetics of the
adsorption U(VI) and Ce(III) ions from 3 M HNO3, Acid, and 3 M NaNO3
+ 0.05 M HNO3, Salt, media. The introduction ratio of the function group
into the polymer base and the uptake of U(VI) ions and Ce(III) ions were
found to decrease with the increase in the alkyl chain length. The uptake
was found to diminish in case of TPhMA resin due to the decrease of the
function group ratio and the steric-hinder effect.

Effect of the Alkyl Chain Length on the Adsorption propertie