Modification of a natural zeolite with Fe(III) for simultaneous phosphate and ammonium removal from aqueous solutions
BACKGROUND: The incorporation of Fe(III) was performed in a natural clinoptilolite (Z-N) for simultaneous phosphate and ammonium removal. RESULTS: The existence of hydroxyl groups (?Fe-OH) in the iron zeolite (Z-Fe) enhances the phosphate uptake from 0.6�0.1mg-P g-1 in Z-N to 3.4�0.2mg-P g-1 in Z-Fe...
Wedi'i Gadw mewn:
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| Awduron Eraill: | , , |
| Fformat: | article |
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2016
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| Mynediad Ar-lein: | http://dspace.utpl.edu.ec/handle/123456789/19000 |
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Ychwanegu Tag
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Ychwanegu Tag | Crynodeb: | BACKGROUND: The incorporation of Fe(III) was performed in a natural clinoptilolite (Z-N) for simultaneous phosphate and ammonium removal. RESULTS: The existence of hydroxyl groups (?Fe-OH) in the iron zeolite (Z-Fe) enhances the phosphate uptake from 0.6�0.1mg-P g-1 in Z-N to 3.4�0.2mg-P g-1 in Z-Fe. However, the ammonium sorption capacity slightly decreases from 33�2mg-Ng-1 in Z-N to 27�2mg-Ng-1 in Z-Fe. The equilibrium and kinetics sorption were well explained by the Langmuir isotherm and the intraparticle diffusion model, respectively. CONCLUSIONS: Both the phosphate and ammonium uptake were slightly affected by the coexistence of competing ions. The phosphate sorption capacity of iron zeolite was decreased in the regeneration cycles. Desorption using a 1molL-1 NaOH solution under dynamic conditions provided higher enrichment factors for ammonium than phosphate. © 2015 Society of Chemical Industry. |
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