Synthesis And Ion-exchange Properties Of Novel Materials On The Basis Of Zirconium (iv) Hydroxophosphates With A Hydroxyethylidenediphosphonic Acid

Category: Ukrainean-polish sympozium

Synthesis and ion-exchange properties of novel MATERIALS ON THE BASIS OF ZIRCONIUM (IV) HYDROXOPHOSPHATES WITH A HYDROXYETHYLIDENEDIPHOSPHONIC ACID

I. A. Farbun, I. V. Romanova, S. A. Khainakov, V. V. Strelko

Institute for Sorption & Problems of Endoecology of the NAS of Ukraine,

13 General Naumov St., 03680 Kiev, Ukraine; E-mail: khain@ispe.kiev.ua

A new type of synthetic hybrid inorganic-organic materials, viz. zirconium (IV) hydroxophosphates with a hydroxyethylidenediphosphonic acid (HEDP), has been synthesized by the reaction of a zirconium hydroxychloride with o-phosphoric and HEDP acids. The sol-gel method was applied for their preparation. The influence of acidity of starting solutions and composition of parent compounds on the polynuclear zirconium complex formation was studied.

A range of materials with various content of HEDP in structure (from0% to 100% ) has been obtained. The samples were characterized by elemental analysis, TG, X-ray diffraction and IR-spectroscopy.

The ion-exchange behaviour of these adsorbents towards alkaline-earth and some transition metal ions (Cu2+, Co2+, Ni2+) was studied. It was shown that these adsorbents exhibit high ion exchange capacity towards heavy metals (CEC, up to 4 meq/g) and alkaline-earth ions – 2,0-2,5 meq/g. The influence of the acidity of the solution upon the alkaline-earth and transition metals uptake was found. The changes of textural properties and crystallinity of the sorbent matrix under the thermal or reflux treatment were studied.

The obtained results show the increase of sorption ability zirconium (IV) hydroxophosphates after HEDP introduction into their matrix.



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