Aerogel materials for photocatalytic detoxification of cyanide wastes in water
| Autor: | Yosry A. Attia, Mohamed S. Ahmed |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Anatase
Materials science Aqueous solution Cyanide Supercritical drying Inorganic chemistry Aerogel Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites medicine Photocatalysis Ferric medicine.drug Shrinkage |
| Zdroj: | Journal of Non-Crystalline Solids. 186:402-407 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/0022-3093(95)00085-2 |
| Popis: | Ultraviolet-irradiated titania-silica (TiO2SiO2) aerogels were used as photocatalysts to oxidize/degrade aqueous cyanide species to CO2 and N2. TiO2SiO2 aerogel photocatalysts were prepared by the sol-gel technique and supercritical drying. Three types of TiO2SiO2 aerogel were prepared with different SiO2 contents (i.e., TiO2:SiO2 molar ratio = 1:1.3, 1:2.6 and 1:3.9). It was observed that, with increased SiO2 content, shrinkage and apparent density decreased and translucency increased. This resulted in higher photocatalytic activity for oxidation of CN− in dilute solutions (1000 and 522 ppm) of ferric cyanide. Compared with titania powder (i.e., anatase form with TiO2 > 98% and particle diameter < 1 μm), it was proven that the aerogel with highest SiO2 content (i.e. TiO2:SiO2 molar ratio = 1:3.9) had highest efficiency in the photocatalytic oxidation of CN− species under the same experimental conditions. This aerogel photocatalyst was filtered and re-used several times to check for activity loss; no significant change in the activity of the photocatalyst was observed. |
| Databáze: | OpenAIRE |
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