Leaching behavior of glasses of the Na2O-B2O3-SiO2-Cr2O3 system
Source abstract
Abstract
Porous glass (PG) obtained by leaching of sodium borosilicate glass (NBS) is actively used in sorption and separation technologies. Modifying the NBS system with additives can drastically affect the resulting PG. Here, we report on the effect that Cr 2O 3 had on the leaching behavior of phase-separated glasses in the Na 2O-B 2O 3-SiO 2-Cr 2O 3 system in 3 M HCl solution. The structure of these glasses was investigated by means of XRPD, EPR, and SEM. All chromium ions exist in the Cr 3+ state and are octahedrally coordinated. Most Cr 2O 3 crystallized as eskolaite in the silica-rich phase. The leaching process is limited by the interdiffusion in the leached porous layer. Cr 2O 3 did not get extracted from the glass into a leaching solution. PGs containing a significant amount of eskolaite were obtained. The component extraction rate for Cr-doped glasses was higher than for Fe-containing glasses with similar compositions, which was explained by the difference in their structural roles.
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Research context
OpenAlex topics: Glass properties and applications · Luminescence Properties of Advanced Materials · Material Science and Thermodynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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