Synthesis of Pyrophosphate and Selenooyrophosohate Based Cation Exchangerso and their Selected Application
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Date
1993-01
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Addis Ababa Universty
Abstract
The synthesis of ceriurn(lV) pyrophosphate and cerium(IV)
selenopyroposphate by mixing aqueous solution of tetrasodium
pyrophosphate with ceriurn(IY) sulfate in 1 M sulfuric acid and
tetrasodium pyrophosphate, sodium selenite with cerium(IV)
sulfate, respectively, are reported .. Elemental analyses showed
that Ce: P04 3 - ratio is 1:2 for ceriurn(IY) pyrophosphate and
0.47:1:0.03, Ce : P04 3 - : 3e03 2 - for ceriurn(IY) selenopyrophosphate.
IR spectra of both exchangers showed five peaks at
frequencies Ca. 3400, 1600,1200,980,200-300 cm- 1 , which are due
to water and hydroxyl group, lattice water, phosphate group,
P-O-P and Ce-O stretching vibrations, respectively. The hydrogen
ion liberation capacities of ceriurn(rV) pyrophosphate and
cerium(IV) selenopyrophosphate were found to be 1.40 and 1.15
meq/g respectively in neutral salt, and about 3 meq/g at pH 8
with ion uptake measurement. The chemical stability, pH
titration, X-ray diffraction, an~ ion uptake have been studied.
On the basis of distribution coefficient obtained at different pH
for some metals column separation of this same metal ions was
performed. The solid electrical conductivity of the exchangers
was also determined.
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Keywords
ceriurn (lV) pyrophosphate