Phosphate functionalization of spongiolite surface

Spongiolite from Mato Grosso do Sul (Brazil), natural inorganic composite constituted of silica needles, was treated with concentrated phosphoric acid at high temperatures. Superficial coating of the needles was proved to be constituted of silicon diphosphate, a compound offering six-coordinated sil...

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Bibliographic Details
Published in:Materials chemistry and physics 2003-12, Vol.82 (3), p.980-983
Main Authors: Melnikov, Petr, Santagnelli, Silvia Benedito, dos Santos, Francisco José, Delben, Angela A.S.T., Jurkevicz Delben, José Renato, Rainho Teixeira, André Luiz
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Lanthanide sorption
Materials science
Phosphate group
Physics
Spongiolite
Spongolite
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Summary:Spongiolite from Mato Grosso do Sul (Brazil), natural inorganic composite constituted of silica needles, was treated with concentrated phosphoric acid at high temperatures. Superficial coating of the needles was proved to be constituted of silicon diphosphate, a compound offering six-coordinated silicon sites. Owing to the affinity of three charged ions to phosphate groups, this coating acts as specific adsorbent for the rare earth elements which prefer octahedral coordination (starting from samarium, yttrium included). The uptake of lanthanum and neodymium are significantly lower due to different coordination tendencies. Lanthanide fixation upon silica with PO 4 groups anchored on its surface may be useful in the manufacturing of special phosphate–silicate glasses.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2003.08.011