| Autor: |
C. U. Ferreira, J. E. Gonçalves, Y. V. Kholin, Y. Gushikem |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Eclética Química, Vol 30, Iss 1, Pp 51-58 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1678-4618 |
| DOI: |
10.26850/1678-4618eqj.v30.1.2005.p51-58 |
| Popis: |
The porous mixed oxide SiO 2 /TiO 2 /Sb 2 O 5 obtained by the sol-gel processing method presented a good ion exchange property and a high exchange capacity towards the Li + , Na + and K + ions. In the H + / M + ion exchange process, the H + / Na + could be described as presenting an ideal character. The ion exchange equilibria of Li + and K + were quantitatively described with the help of the model of fixed tetradentate centers. The results of simulation evidence that for the H + / Li + exchange the usual situation takes place: the affinity of the material to the Li + ions is decreased with increasing the degree of ion exchange. On the contrary, for K + the effects of positive cooperativity, that facilitate the H + / K + exchange, were revealed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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