Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite
A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminium oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (ffiAl-OH) into the zeolite structure, as active groups for phosphate removal, wa...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/76713 |
| Acceso en línea: | https://hdl.handle.net/2117/76713 https://dx.doi.org/10.1016/j.cej.2015.03.003 |
| Access Level: | acceso abierto |
| Palabra clave: | Clinoptilolite Zeolites Aluminum oxide Kinetics Natural zeolite Modification Hydrated aluminum oxide Adsorption Kinetic SWINE WASTE-WATER COAL FLY-ASH ADSORPTIVE REMOVAL SURFACE-CHARGE DRINKING-WATER ZERO CHARGE STI ZEOLITE RICH TUFFS CLINOPTILOLITE IRON Amoni -- Absorció i adsorció Alumini Àrees temàtiques de la UPC::Enginyeria química |
| Sumario: | A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminium oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (ffiAl-OH) into the zeolite structure, as active groups for phosphate removal, was characterized by acid–base titrations (pHPZC= 4.5 ± 0.2). The phosphate sorption increases from 0.6 mg-P/g for Z-N up to 7.0 mg-P/g while only a slight decrease on the ammonium sorption capacity from 33 mg-N/g of Z-N to 30 mg-N/g for Z-Al was observed. The HAlO modified zeolite sorption capacity for both phosphate and ammonium was slightly reduced by common ions typically present in secondary waste water effluents. Column experiments revealed higher enrichment factor for ammonium (120) than for phosphate (50) using 1 M NaOH as elution solution. A reduction of zeolite phosphate capacity with regeneration cycles was observed |
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