Research on Obtaining Silica Xerogels from Nepheline and Study of some of their Physical and Chemical Properties
| Autor: | Yuriy Velyaev, Ilona Kometiani, Dmitry Maiorov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Nepheline General Materials Science Amorphous silica 0210 nano-technology |
| Zdroj: | Materials Science Forum. 989:121-126 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.989.121 |
| Popis: | The article presents a method to obtain silica xerogels with developed specific surface based on nepheline concentrate acid decomposition in C2H5OH-H2SO4 system. It was found that the use of ethanol instead of water produces stable and steady silica gels. It is proved that the use of ethanol results in almost complete deposition of soda alum and aluminum potassium sulphate out of nepheline decomposition solution without its additional cooling, due to their extremely low solubility in alcohol solution. The morphology, structural and surface properties of synthesized xerogel sample with ~600 m2/g specific surface area (based on the analysis) were investigated; its mixed micro-and mesoporous structure was established. Electron probe microanalysis showed chemical purity of the resulting SiO2. |
| Databáze: | OpenAIRE |
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