Enhanced arsenite removal by superparamagnetic iron oxide nanoparticles in-situ synthesized on a commercial cube-shape sponge : adsorption-oxidation mechanism
Lou, Xiang-Yang (Universitat Autònoma de Barcelona. Departament de Química)
Boada, Roberto (Universitat Autònoma de Barcelona. Departament de Química)
Simonelli, Laura (ALBA Laboratori de Llum de Sincrotró)
Valiente Malmagro, Manuel (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2022
Abstract:	Hypothesis: The easy aggregation of superparamagnetic iron oxide nanoparticles (SPION) greatly reduces their adsorption performance for removing arsenic (As) from polluted water. We propose to exploit the porosity and good diffusion properties of a cube-shaped cellulose sponge for loading SPION to reduce the aggregation and to develop a composite adsorbent in the cm-scale that could be used for industrial applications. Experiments: SPION were in-situ synthesized by co-precipitation using a commercial cube-shaped sponge (MetalZorb®) as support. The morphology, iron-oxide phase, adsorption performance and thermodynamic parameters of the composite adsorbent were determined to better understand the adsorption process. X-ray absorption spectroscopy (XAS) was used to investigate the chemical state of the adsorbed As(III). Findings: The adsorption of the supported SPION outperforms the unsupported SPION (ca. 14 times higher adsorption capacity). The modelling of the adsorption isotherms and the kinetic curves indicated that chemisorption is controlling the adsorption process. The thermodynamic analysis shows that the adsorption retains the spontaneous and endothermic character of the unsupported SPION. The XAS results revealed an adsorption-oxidation mechanism in which the adsorbed As(III) was partially oxidized to less toxic As(V) by the hydroxyl free radical (•OH) generated from Fe(III) species and by the hydroxyl groups.
Grants:	European Commission 665919 Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R
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:	Arsenite removal ; Adsorption-oxidation ; Superparamagnetic iron oxide nanoparticles (SPION) ; Commercial cube sponge ; X-ray absorption spectroscopy
Published in:	Journal of colloid and interface science, Vol. 614 (May 2022) , p. 460-467, ISSN 1095-7103

DOI: 10.1016/j.jcis.2022.01.119
PMID: 35108637

8 p, 1.4 MB

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