Evaluation of low-cost geo-adsorbents for As(V) removal
Inchaurrondo, Natalia (Universidad Nacional de Mar del Plata)
Di Luca, Carla (Universidad Nacional de Mar del Plata)
Haure, Patricia (Universidad Nacional de Mar del Plata)
Žerjav, Gregor (National Institute of Chemistry Ljubljana)
Pintar, Albin (National Institute of Chemistry Ljubljana)
Palet i Ballús, Cristina (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2021
Descripció:	21 pàg.
Resum:	Four low-cost iron-bearing geo-adsorbents were tested for As(V) removal without pretreatment: Montanit300® (M), diatomite (D), pumice (P) and black sand (BS). The solids were carefully characterized by different analytical techniques (SEM-EDX, TPD-pyridine, N2 Physisorption, XRD and point of zero charge). The adsorption of As(V) was evaluated through isotherms and kinetic studies (bottled water matrix, pH0=8,25 g/L of solids), and experiments addressing pH effect (pH0=3. 6,7. 5,11) and the presence of interfering anions (Cl-, SO42-, NO3-, PO43-). Experimental results were fitted to the Freundlich and Langmuir sorption isotherms. Under the employed conditions, P showed negligible adsorption, M and D presented adsorption capacities around 0. 02 mg/g and, in spite its lower surface area, BS displayed the highest value (0. 045 mg/g), which relates to a higher density of Fe species, M and D samples were easily regenerated (80%-100% desorption) through a basic treatment (0. 01 M NaOH) and presented fast adsorption kinetics (1 h for D and seconds for M). BS showed a slow adsorption kinetic (24 h) and poor regeneration (only 50% desorption). Sample M (natural zeolite) resulted a promising option due to its remarkably fast adsorption kinetic, easy regeneration and adsorption capacity suitable for systems with relatively low As concentrations.
Ajuts:	European Commission 645024
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Adsorption mechanism ; As(V) removal ; Fe-bearing minerals ; Geo-adsorbents
Publicat a:	Environmental technology & innovation, Vol. 21 (February 2021) , art. 101341, ISSN 2352-1864

DOI: 10.1016/j.eti.2020.101341

Article. Preprint 22 p, 401.8 KB

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Taules 5 p, 180.5 KB

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