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 (congruent to Fe-OH) in the iron zeolite (Z-Fe) enhances the phosphate uptake from 0.6 +/- 0.1 mg-P g(-1) in Z-N to 3.4...
| Authors: | , , , |
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| Format: | article |
| Publication Date: | 2016 |
| Country: | España |
| Institution: | Universitat Politècnica de Catalunya (UPC) |
| Repository: | UPCommons. Portal del coneixement obert de la UPC |
| Language: | English |
| OAI Identifier: | oai:upcommons.upc.edu:2117/96708 |
| Online Access: | https://hdl.handle.net/2117/96708 https://dx.doi.org/10.1002/jctb.4763 |
| Access Level: | Open access |
| Keyword: | Sewage--Purification Zeolites Clinoptilolite Iron Phosphate Ammonium Sorption Kinetic Swine waste-water Coal fly-ash Modified clinoptilolite Adsorptive removal Eutrophic waters Rich tuffs In-situ Adsorbent Aigües residuals -- Depuració -- Eliminació d'amoni Àrees temàtiques de la UPC::Enginyeria química |
| Summary: | 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 (congruent to Fe-OH) in the iron zeolite (Z-Fe) enhances the phosphate uptake from 0.6 +/- 0.1 mg-P g(-1) in Z-N to 3.4 +/- 0.2 mg-P g(-1) in Z-Fe. However, the ammonium sorption capacity slightly decreases from 33 +/- 2 mg-N g(-1) in Z-N to 27 +/- 2 mg-N g(-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 1 mol L-1 NaOH solution under dynamic conditions provided higher enrichment factors for ammonium than phosphate |
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