The influence of chemical and thermal treatment on the point of zero charge of hydrous zirconium oxide
| Autor: | Slavica Zec, Jovan B. Stanković, Slobodan K. Milonjić |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Inorganic chemistry 02 engineering and technology Thermal treatment 010501 environmental sciences 01 natural sciences law.invention lcsh:Chemistry zirconium oxide point of zero charge law Phase (matter) Cubic zirconia Point of zero charge Crystallization 0105 earth and related environmental sciences Aqueous solution Precipitation (chemistry) General Chemistry 021001 nanoscience & nanotechnology 6. Clean water lcsh:QD1-999 surface properties 0210 nano-technology thermal analysis Monoclinic crystal system |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 78, Iss 7, Pp 987-995 (2013) Journal of the Serbian Chemical Society |
| ISSN: | 1820-7421 0352-5139 |
| DOI: | 10.2298/jsc121010149s |
| Popis: | Two zirconia samples were prepared by precipitation from aqueous zirconium oxychloride and zirconil sulphate solutions with potassium hydroxide. The prepared zirconia samples were amorphous. The pHpzc values of zirconia samples, determined from NaCl and NaNO3 solutions, were 6.6 ± 0.1 and 6.9 ± 0.1, respectively. After prolonged hydration of zirconia in doubly distilled water, pHpzc decreased to 4.7 ± 0.3. Crystallization into tetragonal (metastable) + monoclinic zirconia appeared at 691 K. Above 873 K, tetragonal metastable phase changes to monoclinic one. It was shown that crystallite sizes of zirconia treated at 673 - 1273 K increased from 9.5 nm to 40.5 nm, respectively. The increase in temperature from 385 K to 1070 K increased the pHpzc of zirconia samples from 6.6 to 9.0, respectively. [Projekat Ministarstva nauke Republike Srbije, br. 45012] |
| Databáze: | OpenAIRE |
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