Abstract
In this paper ammonium molybdophosphate (AMP) and ammonium molybdophosphate-zirconium phosphate-silica (AMP-ZrP-SiO2) were prepared as trace Rb+and Cs+adsorbents. The two showed good adsorption performance for trace Rb+and Cs+when dealing with the salt lake brine. AMP-ZrP-SiO2has better hydraulics performance, and is more suitable for column adsorption. The adsorption mechanism, enthalpies (ΔH0), Gibbs free energies (ΔG0), and activation energies (Ea) of Rb+and Cs+from salt lake brine by the two adsorbents were investigated. The results show that the adsorption processes of Rb+and Cs+on AMP and AMP-ZrP-SiO2are spontaneous and endothermic. The adsorption order of various ions on the two adsorbents is Cs+>Rb+>K+>Mg2+>Na+>Li+by comparing their Gibbs free energies. Through the analysis of activation energies indicates that AMP-ZrP-SiO2is more efficient than AMP in the enrichment process of trace Rb+and Cs+.
Publisher
Trans Tech Publications, Ltd.
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