Formation and characterization of phosphate-modified silicate materials derived from sol–gel process View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-03

AUTHORS

Anastasia Epiphanova, Oleg Magaev, Olga Vodyankina

ABSTRACT

Phosphate-containing silicate materials prepared using sol–gel method from Si(OC2H5) were investigated at the variation of the amount of phosphate modifier from 5 to 50 wt% in term of P2O5. Chemical composition, textural and structural properties of these materials were characterized by FTIR-spectroscopy, TEM, X-ray diffraction and nitrogen adsorption. It was shown that the materials posse monomodal pore size distribution of 5–20 nm for the samples dried at 100 °C and 40–60 nm for the specimens calcined at 600 °C. The mean pore size and surface area depended on the amount of phosphoric acid. Before the stage of high temperature treatment phosphoric acid, introduced into the structure of the materials as a modifying agent, was uniformly distributed inside a porous space of the material and was not chemically bonded with silicate. After high temperature treatment both chemical interaction of silicate with phosphate, providing the formation of silicate-phosphate structures, as well as redistribution of free modifier from the bulk of granules to their surface took place. The polyphosphate layer is formed on the material surface closing the internal porous space. However, in this case a part of the phosphate modifier remains chemically unbound to SiO2 structure. More... »

PAGES

509-517

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10971-011-2652-z

DOI

http://dx.doi.org/10.1007/s10971-011-2652-z

DIMENSIONS

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