Effects of Acetate on Cation Exchange Capacity of a Zn-Containing Montmorillonite: Physicochemical Significance and Metal Uptake
| dc.contributor.author | Stathi, P. | en |
| dc.contributor.author | Papadas, I. T. | en |
| dc.contributor.author | Enotiadis, A. | en |
| dc.contributor.author | Gengler, R. Y. N. | en |
| dc.contributor.author | Gournis, D. | en |
| dc.contributor.author | Rudolf, P. | en |
| dc.contributor.author | Deligiannakis, Y. | en |
| dc.date.accessioned | 2015-11-24T17:33:36Z | |
| dc.date.available | 2015-11-24T17:33:36Z | |
| dc.identifier.issn | 0743-7463 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/13880 | |
| dc.rights | Default Licence | - |
| dc.subject | acid-base chemistry | en |
| dc.subject | clay-minerals | en |
| dc.subject | layer-charge | en |
| dc.subject | adsorption | en |
| dc.subject | smectites | en |
| dc.subject | sorption | en |
| dc.subject | surface | en |
| dc.subject | titration | en |
| dc.subject | cec | en |
| dc.subject | organoclays | en |
| dc.title | Effects of Acetate on Cation Exchange Capacity of a Zn-Containing Montmorillonite: Physicochemical Significance and Metal Uptake | en |
| heal.abstract | Fundamental properties such as cation exchange capacity (CEC), permanent charge, pH(PZC), and metal uptake of a Zn-containing montmorillonite are modified, in a predictable manner, by a mild chemical treatment using acetate. Acetate treatment allows a controllable increase of the CEC of montmorillonite up to 180 mequiv/100 g. The CEC of the clay is increasing for decreasing Zn content, with a slope of Delta[Zn/Delta[CEC] approximate to -2. X-ray powder diffraction analysis shows that the lamellar structure of the clay remains unaltered by the acetate treatment, while XPS substantiates the removal of Zn. H(+) uptake data show that the intrinsic protonation pK values and concentration of the variable charge sites ( SOH) are not modified by the acetate treatment. In contrast, the concentration of the permanent charge sites ( X(-)) increased linearly with Zn removal by acetate, leading to a significant H(+) and Cd(2+) uptake enhancement. A physical model is suggested where acetate removes Zn ions strongly bound in the clay, and this in turn modulates the permanent charge and the CEC of the clay. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1021/La900831q | - |
| heal.identifier.secondary | <Go to ISI>://000266929900036 | - |
| heal.journalName | Langmuir | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2009 | - |
| heal.publisher | American Chemical Society | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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