Synthesis Of Pyrophosphate And Selenooyrophosohate Based Cation Exchangerso And Their Selected Application

The synthesis of ceriurn(lV) pyrophosphate and cerium(IV)rnselenopyroposphate by mixing aqueous solution of tetrasodiumrnpyrophosphate with ceriurn(IY) sulfate in 1 M sulfuric acid andrntetrasodium pyrophosphate, sodium selenite with cerium(IV)rnsulfate, respectively, are reported .. Elemental analyses showedrnthat Ce: P04 3 - ratio is 1:2 for ceriurn(IY) pyrophosphate andrn0.47:1:0.03, Ce : P04 3 - : 3e03 2 - for ceriurn(IY) selenopyrophosphate.rnIR spectra of both exchangers showed five peaks atrnfrequencies Ca. 3400, 1600,1200,980,200-300 cm- 1 , which are duernto water and hydroxyl group, lattice water, phosphate group,rnP-O-P and Ce-O stretching vibrations, respectively. The hydrogenrnion liberation capacities of ceriurn(rV) pyrophosphate andrncerium(IV) selenopyrophosphate were found to be 1.40 and 1.15rnmeq/g respectively in neutral salt, and about 3 meq/g at pH 8rnwith ion uptake measurement. The chemical stability, pHrntitration, X-ray diffraction, an~ ion uptake have been studied.rnOn the basis of distribution coefficient obtained at different pHrnfor some metals column separation of this same metal ions wasrnperformed. The solid electrical conductivity of the exchangersrnwas also determined.

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