Process Analysis of Rb+ and Cs+ Adsorption from Salt Lake Brine by Ammonium Molybdophosphate Composite Material

Wei Jun Yang; Shi Ming Liu; Yong Jin Li; Yun Jing Huang; Xi Sheng Luo

doi:10.4028/www.scientific.net/AMR.785-786.812

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 785-786Process Analysis of Rb+ and Cs+ Adsorption from...

Process Analysis of Rb⁺ and Cs⁺ Adsorption from Salt Lake Brine by Ammonium Molybdophosphate Composite Material

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 (E_a) 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-SiO₂ are 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⁺.

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Periodical:

Advanced Materials Research (Volumes 785-786)

Pages:

812-816

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.785-786.812

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Online since:

September 2013

Authors:

Wei Jun Yang, Shi Ming Liu, Yong Jin Li, Yun Jing Huang, Xi Sheng Luo

Keywords:

Adsorption, Cesium, Composite Ammonium Molybdophosphate, Rubidium , Salt Lake Brine

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