Sorption of Cadmium and Lead by Bacteria–Ferrihydrite Composites
| Autor: | Danielle Fortin, E. Kulczycki, F. G. Ferris, David A. Fowle |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Cadmium
Langmuir biology Oxide chemistry.chemical_element Sorption biology.organism_classification Microbiology Metal chemistry.chemical_compound Ferrihydrite Adsorption chemistry visual_art Earth and Planetary Sciences (miscellaneous) visual_art.visual_art_medium Environmental Chemistry Composite material Bacteria General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 22:299-310 |
| ISSN: | 1521-0529 0149-0451 |
| DOI: | 10.1080/01490450500184694 |
| Popis: | The sorptive behavior of bacteria—iron oxide composites was investigated in batch metal sorption assays using ferrihydrite in isolation (0.13 and 0.14 g/L ferrihydrite in cadmium and lead systems, respectively) as well as in combination with Bacillus subtilis (0.25 g/L adsorbent mixture) and Escherichia coli (0.27 g/L adsorbent mixture). A pH range from 3.0 to 6.5 was studied using total metal concentrations of 1.0 × 10 − 4.0 and 3.2 × 10 − 5 M with adsorbent mixtures proportioned on a 1:1 mass/volume basis. The log of the apparent surface complex formation constants (log K S M ) and sorption capacity (S max ) values were determined by fitting the experimental data to one-site Langmuir sorption isotherms. The one-site model effectively described the sorption data (r 2 > 0.9), where Cd 2 + exhibited somewhat lower sorption affinities (log K S M = −3 for ferrihydrite, −1.7 for B. subtilis–ferrihydrite, and −1.1 for E. coli–ferrihydrite) than Pb 2 + (log K S M = −0.9 for ferrihydrite, − 0.2 forB. subtilis–fe... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |