Different investigations indicated that the sorption processes on the amorphous titanium phosphate are complex in strong-acid medium. The uptake of alkali ions occurs not only by ion exchange but by irreversible sorption processes depending on the hydrogen ion concentration. The selectivity observed for ions of hydrated ionic radius greater than 0. 13 nm indicates the existence on the sorbent of active sites with a specific geometrical structure. The pore sizes of the amorphous product are greater by about one order of magnitude than the sizes of the ions, hydrated ions and ion pairs existing in the liquid phase.
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