Effects of copper-adsorption on the line-profile of first basal reflection of montmorillonite
Montmorillonite containing mostly Ca as interlayer cation was used for examining the effects of coppercomplex forming and adsorption on the surface of montmorillonite. Exchangeable cations were replaced with ammonium (NH4+ ) and sodium (Na+ ) ions, thus getting monoionic montmorillonite-forms. Coppe...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1997
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| Sorozat: | Acta mineralogica-petrographica
38 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24845 |
| Tartalmi kivonat: | Montmorillonite containing mostly Ca as interlayer cation was used for examining the effects of coppercomplex forming and adsorption on the surface of montmorillonite. Exchangeable cations were replaced with ammonium (NH4+ ) and sodium (Na+ ) ions, thus getting monoionic montmorillonite-forms. Copper sorption on mineral surface may include several processes with different characteristics. In case óf montmorillonite ionexchange in the interlayer region and complexation on the surface hydroxyl groups can be taken into account. The Cu-uptake analysed by Langmuir's adsorption isotherm is the sum of these metal binding reactions. Starting pH was 4.5 and equilibrium pH was observed. Different concentrations of solutions of CuSOj from 0 to 1400 ppm were used. The place and profile of X-ray diffraction basal reflection d(xn of montmorillonite is very characteristic and depends on the features and amount of adsorbed cation and water: As to the X-ray diffraction line-profile analysis, in the function of adsorbed amount of copper a significant change occured in crystallite size (size of domains coherently scatter X-rays) and degree of deformation even in half-width of the first basal reflection. Our result is that half-width (signed as SmC) does not but the other two variables does indicate the adsorptional process well and their variance correlate with on the adsorption isotherms. |
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| Terjedelem/Fizikai jellemzők: | 25-36 |
| ISSN: | 0365-8066 |