Decoupling the adsorption mechanisms of arsenate at molecular level on modified cube-shaped sponge loaded superparamagnetic iron oxide nanoparticles
Lou, Xiang-Yang (Universitat Autònoma de Barcelona. Departament de Química)
Boada, Roberto (Universitat Autònoma de Barcelona. Departament de Química)
Verdugo, Verónica (Universitat Autònoma de Barcelona. Departament de Química)
Simonelli, Laura (ALBA Laboratori de Llum de Sincrotró)
Pérez González, Gustavo (Universitat Autònoma de Barcelona. Departament de Química)
Valiente Malmagro, Manuel (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2022
Abstract:	In this study, a commercial cube-shaped open-celled cellulose sponge adsorbent was modified by in-situ co-precipitation of superparamagnetic iron oxide nanoparticles (SPION) and used to remove As(V) from aqueous solutions. Fe K-edge X-ray absorption spectroscopy (XAS) and TEM identified maghemite as the main iron phase of the SPION nanoparticles with an average size 13 nm. Batch adsorption experiments at 800 mg/L showed a 63% increase of adsorption capacity when loading 2. 6 wt. % mass fraction of SPION in the cube-sponge. Experimental determination of the adsorption thermodynamic parameters indicated that the As(V) adsorption on the composite material is a spontaneous and exothermic process. As K-edge XAS results confirmed that the adsorption enhancement on the composite can be attributed to the nanoparticles loaded. In addition, adsorbed As(V) did not get reduced to more toxic As(III) and formed a binuclear corner-sharing complex with SPION. The advantageous cube-shape of the sponge-loaded SPION composite together with its high affinity and good adsorption capacity for As(V), good regeneration capability and the enhanced-diffusion attributed to its open-celled structure make this adsorbent a good candidate for industrial applications.
Grants:	Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R European Commission 665919
Note:	Altres ajuts: acords transformatius de la UAB
Rights:	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.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Adsorption ; Cube composite adsorbent ; Arsenate removal ; Regeneration ; X-ray absorption spectroscopy
Published in:	Journal of environmental sciences, Vol. 121 (November 2022) , p. 1-12, ISSN 1878-7320

DOI: 10.1016/j.jes.2021.09.001
PMID: 35654501

12 p, 3.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles