Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions
| Autor: | Marjanović Vesna M., Lazarević Slavica S., Janković-Častvan Ivona M., Jokić Bojan M., Bjelajac Anđelika Z., Janaćković Đorđe T., Petrović Rada D. |
|---|---|
| Jazyk: | English<br />Serbian |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Hemijska Industrija, Vol 67, Iss 5, Pp 715-728 (2013) |
| Druh dokumentu: | article |
| ISSN: | 0367-598X 2217-7426 |
| DOI: | 10.2298/HEMIND121026117M |
| Popis: | Chromium(VI) adsorption from aqueous solutions onto thermo-acid activated sepiolite functionalized with (3-mercaptopropyl)trimethoxy-silane and [3-(2-aminoethylamino)pro-pyl]trimethoxy-silane, was investigated. Scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis, nitrogen adsorption-desorption, and determination of the point of zero charge were used to characterize the obtained adsorbents. It has been established that the silanes were successfully grafted on the thermo-acid activated sepiolite surfaces and that the structure of parent material was preserved during the functionalization. The adsorption of Cr(VI) onto functionalized thermo-acid activated sepiolite was tested as a function of initial pH values at 298 K. The amine functionalized thermo-acid activated sepiolite showed a higher adsorption capacity than the mercapto functionalized thermo-acid activated sepiolite at all studied initial pH values, especially at the initial pH = 2. [Projekat Ministarstva nauke Republike Srbije, br. III45019] |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|