Zirconium (IV) hydrogen phosphate
| General | ||||||||||||||||
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| Surname | Zirconium (IV) hydrogen phosphate | |||||||||||||||
| other names |
Zirconium phosphate (ambiguous) |
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| Molecular formula | Zr (HPO 4 ) 2 | |||||||||||||||
| Brief description |
white solid |
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| External identifiers / databases | ||||||||||||||||
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| properties | ||||||||||||||||
| Molar mass | 283.18 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
3.3 g cm −3 (25 ° C) |
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| safety instructions | ||||||||||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Zirconium (IV) hydrogen phosphate is an inorganic chemical compound of zirconium from the group of phosphates .
Extraction and presentation
When phosphates of zirconium, hafnium or titanium are precipitated from hydrochloric acid solutions of the metal salts with phosphate, gel-like X-ray amorphous precipitates are formed, the composition of which roughly corresponds to the formula M (HPO 4 ) 2 H 2 O (M = Ti, Zr, Hf), but due to its polymeric character, it differs more or less depending on the manufacturing conditions. However, suitable processes can also be used to produce crystalline phosphates with a better composition (for example zirconium orthophosphate ). Zirconium phosphates have been studied in detail because of their cation exchange capacity .
Zirconium (IV) hydrogen phosphate can be obtained by reacting zirconium oxychloride octahydrate with phosphoric acid.
properties
Zirconium (IV) hydrogen phosphate is a white, crystalline solid with a layered structure that is isotypic to the analogous phosphates of titanium, germanium, tin and lead . It reversibly loses its water of crystallization at 110 ° C and decomposes at 700 ° C to form ZrP 2 O 7 . It is sparingly soluble in concentrated mineral acids , with the exception of hydrofluoric acid. The layer structure can accommodate a varying number of water of crystallization (0..2) between the layers, whereby the distance between the layers also changes. In the literature (in contrast to the otherwise customary nomenclature of modifications) the monohydrate is referred to as α-zirconium phosphate, the dihydrate as γ-zirconium phosphate and the anhydrate as β-zirconium phosphate. α-Zirconium phosphate has a monoclinic crystal structure with the space group P 2 1 / c (space group no. 14) and Z = 4. The dihydrate also has a monoclinic crystal structure.
use
Zirconium (IV) hydrogen phosphate is used to produce compounds with an organic or inorganic layer structure. α-Zirconium (IV) hydrogen phosphate can be used to remove Ca 2+ and Mg 2+ ions from solutions. γ-Zirconium (IV) hydrogen phosphate can be used for ion exchange with phosphate esters.
Individual evidence
- ↑ a b c d Georg Brauer (Ed.): Handbook of Preparative Inorganic Chemistry . 3., reworked. Edition. tape II . Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1385 .
- ↑ a b c d data sheet zirconium (IV) hydrogen phosphate from Sigma-Aldrich , accessed on May 25, 2017 ( PDF ).
- ↑ AI Orlova, SG SamoAe; lov, GN Kazantsev, V. Yu. Volgutov, DM Bykov, AV Golubev, E. Yu. Borovikova: Investigation of zirconium phosphate Zr 3 (PO 4 ) 4 during heating. In: Crystallography Reports. 54, 2009, pp. 431-438, doi : 10.1134 / S1063774509030109 .
- ^ A b D. EC Corbridge: Phosphorus: Chemistry, Biochemistry and Technology, Sixth Edition . Taylor & Francis Group, 2013, ISBN 978-1-4398-4088-7 , pp. 291 ( limited preview in Google Book search).
- ↑ by MT Averbuch-Pouchot, André Durif: Topics in Phosphate Chemistry - MT Averbuch-Pouchot, André Durif . World Scientific, 1996, ISBN 978-981-02-2634-3 , pp. 92 f . ( limited preview in Google Book search).