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Article
Mixed insoluble acidic salts of tetravalent metals
Mixed amorphous glassy type hafnium-titanium phosphates have been prepared. The composition and ion exchange capacity of the samples were investigated before and after γ-irradiation. In addition, the effect of...
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Article
Selectivity of glassy type mixed zirconium-titanium phosphate toward rare earth metal ions
The selectivity of glass type mixed Zr+Ti phosphates with various Ti contents has been investigated toward rare earth metal ions. The kd values were determined by radiotracer technique both in HCl and HNO3 soluti...
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Article
Thermal decomposition of organic derivatives of crystalline zirconium phosphate
The diethylene glycol, benzyl alcohol and benzylamine derivatives ofα- andγ-zirconium phosphates were prepared and their thermal behaviour was investigated by means of differential thermal analysis. In all cases,...
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Article
Thermal decomposition of organic derivatives of crystalline zirconium phosphate
The thermal decompositions ofn-alkylamine (ethylamine, propylamine, butylamine and pentylamine) derivates ofγ-zirconium phosphate were investigated. The samples exhibited similar mechanisms of decomposition.
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Article
Thermal decomposition of organic derivatives of crystalline zirconium phosphate
Organic derivatives ofγ-zirconium phosphate were investigated. Then- alkanol derivatives lost their crystal and structural water in several steps. The thermal stability of the molecules increased with increasing ...
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Article
Thermal decomposition of organic derivatives of crystalline zirconium phosphate-phosphite
Organic derivatives of crystalline zirconium phosphate-phosphite (ZrPP) are easily obtained by direct contact of the given organic solution with the crystalline material. The thermal decomposition of benzyl al...
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Article
Selectivity of mixed zirconium-titanium phosphates toward transition metals
Mixed zirconium-titanium phosphates were synthesized by various methods and under various conditions. The effect of these conditions on the selectivity of synthetized samples toward the transition metal ions w...
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Article
Thermal behaviour of acidic salts of mixed tetravalent metals
Mixed zirconium-titanium phosphate samples were irradiated in a gamma-radiation facility with a Co-60 source. The adsorbed dose was 106 Gy. At this dose, a change in thermal bahaviour was found only for the sampl...
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Article
Thermal behaviour of acidic salts of mixed tetravalent metals
The results of investigations on intercalated crystalline zirconium phosphate are described in the literature. The behaviour of crystalline phosphates containing both zirconium and titanium metal ions has not ...
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Article
Effect of gamma-radiation on amorphous mixed zirconium-titanium phosphates
A precipitation method was used to prepare amorphous mixed zirconium-titanium phosphates with various titanium contents. In this way the acidic solutions of ZrOCl2.8H2O and TiCl4 in various ratios were rapidly mi...
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Article
Mixed insoluble acidic salts of tetravalent metals
Mixed amorphous, glassy type, zirconium-titanium arsenate (ZrTiAs) and hafniumtitanium arsenate (HfTiAs) have been prepared. The composition and exchange capacity of the prepared samples were investigated in c...
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Article
Mixed insoluble acidic salts of tetravalent metals
Solid amorphous Zr-, Ti- and ZrxTi(1−x) phosphates (where x=0.10, 0.33, 0.66, and 0.90) in various sodium forms were contacted with an excess of solid oxalic acid dihydrate to its molten state for a given time. T...
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Article
Conversion of solid amorphous mixed zirconium-titanium phosphates into crystalline from by molten oxalic acid
Solid amorphous mixed zirconium-titanium phosphates, with general formula ZrxTi/1−x//HPO4/2.n H2O/ where x=0.1−1, and n=3–5/, are mixed with an excess of solid oxalic acid dihydrate and digested in molten oxalic ...
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Article
Thermal behaviour of mixed tetravalent metal salts
In contrast with the well-known zirconium and titanium phosphates, products containing these metal ions together are unknown. To investigate the thermal behaviour of such materials, samples were synthetized wi...
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Article
Mixed insoluble acidic salts of tetravalent metals VI. Crystalline mixed zirconium-titanium arsenate and hafnium-titanium arsenate
Mixed crystalline zirconium-titanium arsenates ZrxTi(1−x) (HAsO4)2·H2O and harnium-titanium arsenates HfxTi(1−x) (HAsO4)2 H2O (where x=0–1) of various compositions with different Zr/Ti or Hf/Ti ratios have been p...
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Article
Mixed insoluble acidic salts of tetravalent metals IV. Crystalline mixed zirconium — Titanium phosphates
Mixed crystalline alpha zirconium — titanium phosphates with variable zirconium to titanium ratios have been prepared both by the well known gel reflux method and a modified HF method. Chemical analysis, X-ray...
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Article
Mixed insoluble acidic salts of tetravalent metals V. Effect of gamma radiation and drying temperature on granular mixed zirconium-titanium phosphates
Solid ZrOCl2·8H2O was added in a slow stream to a solution of phosphoric acid or to a solution of TiCl4 in phosphoric acid to obtain granules of amorphous Zr(HPO4)2·nH2O or ZrxTi(1−x) (HPO4)2·nH2O(where x=0.95−0....
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Article
Investigation of silica gel supported inorganic ion exchangers
Microcrystalline zirconium phosphate (α-ZrP), hydrous manganese dioxide (HMnO), ammonium molybdophosphate (AMP) and silica gel supported forms of these materials as well as silica gel (SG) itself were investig...
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Article
Silica gel supported microcrystalline zirconium phosphate ion exchanger (Si−ZrP) and its application in chemical separations
Alkali metal ions and transition metal ions were separated on Si−ZrP ion exchanger. The distribution coefficients (Kd) and the relationship between the structure of Si−ZrP and its performance were determined.
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Article
Radio-paperchromatographic determination of different chemical forms of Ga
Model experiments for Ga/Zn separation were carried out using Dowex 1 anion exchanger. Some chemical forms of Ga were identified by radio-paperchromatography and the Rf values have been determined.
