Synthesis and Characterization of Zirconium Titanium Hydroxy Ethylidene Diphosphonate and Its Application in Separation of Metal Ions
A novel hybrid ion exchanger, zirconium titanium hydroxy ethylidene diphosphonate (ZTHEDP), of the class of tetravalent bimetallic acid (TBMA) salt has been synthesized by the sol gel route. ZTHEDP has been characterized for ICP-AES, TGA, FTIR, and XRD. Chemical resistivity of ZTHEDP in various media—acids, bases, and organic solvents have been assessed. Ion exchange capacity (IEC) and the effect of calcination (100°C to 500°C) on IEC has also been studied. The distribution behavior of metal ions Co2+, Ni2+, Cu2+, Zn2+ (d-block), Cd2+, Hg2+, Pb2+, Bi3+ (heavy) and La3+, Ce3+, Th4+, [image omitted] (f-block) towards ZTHEDP has been studied and the distribution coefficient (Kd) evaluated in aqueous as well as various electrolyte media/concentrations. Based on differential selectivity, the breakthrough capacity (BTC) and elution behavior of various metal ions towards ZTHEDP, a few binary and ternary metal ion separations have been carried out.
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Document Type: Research Article
Affiliations: Applied Chemistry Department, Faculty of Technology and Engineering, The M. S. University of Baroda, Vadodara, Gujarat, India
Publication date: 2009-01-01