Palladium(ii) Sorptive Separation By Modified Clinoptilolite
PALLADIUM(II) SORPTIVE SEPARATION by MODIFIED CLINOPTILOLITE
T. Ya. Vrublevs¢ka, O. Ya. Korkuna
Ivan Franko Lviv National University,
Kyryla and Mefodiya Str. 6, 79005 L\’viv, Ukraine
The problem of concentrating trace amounts of platinum metals remains unresolved at present. Analysis of investigated object is so difficult because of present of large amounts of basic component and small concentration of Pd(II). Such kinds of concentration as extraction, co-precipitation and chromatografphic separation are necessary in those analyses. Literary date concerns application of natural zeolites, particularly, clinoptilolite for concentration platinum metals are not reported. Natural zeolite has number preferences compare to synthetic analogs.
This work deals with investigation of possibility of palladium separation and concentration by H-clinoptilolite. Influence of zeolite grains size on palladium sorption has been studied. As a result of this experiment the fraction with diameter of grain 0.200-0.315 mm was selected.
So far as sorption was investigated in static conditions, sorption kinetics was studied. There was determined that equilibrium comes in hour during the shaking.
The conditions of modifying natural sorbent by solutions of HCl, HNO3, HClO4, H2SO4 have been investigated. Optimum concentration limits of acid solutions for transportation clinoptilolite into H-form have been determined. Optimum conditions of palladium (II) sorption on modificated sorbent have been investigated. Sorbent modificated of concentrating HCl possess by maximum sorptive ability. Evidently it connect with formation of complexes on sorbent surface. Sorption capacity of H-clinoptilolite is 11420 mg/g.
The influence of organic modificators such as 1-(2-pyridilazo)-2-naphthol (PAN) and Chrom Azurol S on palladium sorption have been studied. It was determined that sorbent modificated by hexan solution of PAN by evaporation method possess of maximum sorptive capacity. It was investigated that sorption Pd(II) connect with formation of complexes on sorbent surface.
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