A characterization study of some aspects of the adsorption of aqueous Co2+ ions on a natural bentonite clay
| Autor: | Talal Shahwan, H. N. Erten, S. Ünügür |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Hot Temperature
Time Factors Chemical Phenomena Inorganic chemistry Mineralogy Endothermic process Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption X-Ray Diffraction Freundlich equation Colloids Ions Aqueous solution Chemistry Physical Chemistry Temperature Water Sorption Cobalt Silicon Dioxide Cristobalite Surfaces Coatings and Films Electronic Optical and Magnetic Materials Montmorillonite Bentonite Microscopy Electron Scanning Clay Thermodynamics Aluminum Silicates Co2+ |
| Zdroj: | Journal of Colloid and Interface Science |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2006.04.069 |
| Popis: | The natural bentonite used in this study contained montmorillonite in addition to low cristobalite. The uptake of aqueous Co2+ ions was investigated as a function of time, concentration, and temperature. In addition, the change in the interlayer space of montmorillonite was analyzed using XRPD, and the distribution of fixed Co2+ ions on the heterogeneous clay surface was recorded using EDS mapping. The sorbed amount of Co2+ appeared to closely follow Freundlich isotherm, with the sorption process showing apparent endothermic behavior. The relevance of the apparent Δ H o values is briefly discussed. Analysis of the Co-sorbed bentonite samples using SEM/EDS showed that the montmorillonite fraction in the mineral was more effective in Co2+ fixation than the cristobalite fraction. XRPD analysis demonstrated that the interlayer space of montmorillonite was slightly modified at the end of sorption. |
| Databáze: | OpenAIRE |
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