Synthesis and Characterization of Zirconium Aluminophosphate. A New Cation Exchanger

Abstract

A new inorganic ion exchange sorbent, zirconium aluminophosphate, has been prepared with Na + ion exchange capacity (iec) equal to 2.10 mequiv/dry g. Its X-ray diffraction studies suggest that it is amorphous in nature. Its characterization has also been done by IR, TGA, and DSC so as to identify various functional groups and ion exchange sites present in the material. Further, various ion exchange studies such as determination of iec, elution behavior, pH titration, and distribution behavior have been performed on this material. Distribution coefficients for some heavy metal ions have also been determined to explore its separation potential. This material shows a high selectivity for Pb(II). On this basis some possible binary separations may be Pb(II)-Cd(II) and Pb(II)-Mg(II) on a column of this material.

Adsorption of Pb2+, Zn2+, and Cd2+ from waters by amorphous titanium phosphate

“…As seen from the IR spectra (Fig. 7), the pres- ence of external water within the TiP particles in addition to the strongly hydrogen-bonded OH or extremely strongly coordinated H 2 O is confirmed by the sharp peaks at 3500 and 1650 cm −1 [19,26]. The band from 1000 to 1020 cm −1 represents asymmetric stretching vibration of Ti-P-OH [27,28], and the weak band at 605-615 cm −1 is assigned to the deformation vibration for the Ti-O bond [29].…”

“…pH titration of TiP particles was performed according to the reference [13,19]. Portions (500 mg) of each exchanger were mixed with 100 ml of 0.1 M NaCl.…”

Selective removal of Pb(II), Cd(II), and Zn(II) ions from waters by an inorganic exchanger Zr(HPO3S)2

“…Based on the pH values before and after the exchange process, the milliequivalents of OH − consumed were determined. Milliequivalents of OH − ions consumed by ZrPS or ZrP particles were then plotted against the corresponding pH values to obtain the pH-titration curves [32].…”

A comparative study on Pb2+, Zn2+ and Cd2+ sorption onto zirconium phosphate supported by a cation exchanger

“…Based on the pH values before and after the exchange process, the milliequivalents (meq) of OH − ion consumed were determined. Milliequivalents of OH − ions consumed by the exchanger were then plotted against the corresponding pH values to obtain the pH-titration curves [12,15]. Scheme 1.…”