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| Titel: |
Water Adsorption and Surface Acidity of Nano-Ball Allophane as Affected by Heat Treatment |
| Auteur: |
Hamayoon Khan Rozina Khan Naoto Matsue Teruo Henmi |
| Verschenen in: |
Journal of environmental science and technology |
| Paginering: | Jaargang 2 (2009) nr. 1 pagina's 22-30 |
| Jaar: |
2009 |
| Inhoud: |
Effect of heat treatment on the water adsorption and surface acidity of two nano-ball allophane samples with varying Si/Al ratio under different relative humidities (RHs) was studied. The water vapor adsorption of two allophane samples under various relative humidities, decreased with preheating treatment up to 400 °C for 2 h. The decrease in water adsorption at monolayer level (RH≤0.45) was greater for KnP sample than for KyP sample, whereas the decrease in water adsorption due to capillary condensation between allophane unit particles (RH≥0.6) was greater for KyP sample. These indicate that allophane hollow spherical particles in KyP sample were directly connected each other with the preheating, but those in KnP sample were not. Heat treatment caused the enhancement in the surface acidity of nano-ball allophane samples. The enhancement in the surface acidity after heat treatment is attributed to |
| Uitgever: |
Asian Network for Scientific Information (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 11 gevonden artikelen
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