Artículo
Highly efficient arsenic adsorption onto Mg/Al/Fe layered double hydroxides: Kinetics, isotherm, XPS and Mössbauer spectroscopies
Fecha de publicación:
12/2023
Editorial:
Elsevier
Revista:
Journal of Water Process Engineering
ISSN:
2214-7144
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The adsorption of arsenate onto a Mg/Al/Fe layered double hydroxide (Fe-LDH) was studied at different anion concentration, pH, temperature and stirring rate. Different characterization techniques such as FT-IR, X-ray diffraction, XPS and Mössbauer spectroscopies, and zeta potential measurements were used for determining the mechanism of arsenate adsorption onto the studied solid. Two mechanisms are postulated: a) anion exchange reactions with chloride and hydroxyl ions of the interlayer space, and b) ligand exchange reactions with formation of inner-sphere complexes on the Fe-LDH surfaces, with participation of Fe(III) ions from the structure. Arsenate adsorption on Fe-LDH was dependent on the initial pH and the concentration, but was independent of the stirring rate and temperature. Fe-LDH exhibited excellent As(V) removal capacity, much higher than other adsorbents reported in the literature. A dose of 10 g L−1 Fe-LDH was sufficient to reach a percentage removal higher than 95 % for a concentration of arsenic of 1 × 10−4 M found in certain places in Argentina, obtaining residual arsenate values below the recommended World Health Organization limit (0.01 mg L−1). Although the material dissolves at low pH, its high arsenate removal efficiency, the low cost and the green and sustainable characteristics of the material make it an effective adsorbent for the treatment of arsenic contaminated waters.
Palabras clave:
ADSORPTION
,
ARSENIC
,
LDH
,
REMEDIATION
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos (UE-INN - NODO CONSTITUYENTES)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO CONSTITUYENTES
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO CONSTITUYENTES
Articulos(INQUISUR)
Articulos de INST.DE QUIMICA DEL SUR
Articulos de INST.DE QUIMICA DEL SUR
Citación
Luengo, Carina Vanesa; Lopez, Nicolas Alfredo; Ramos, Cinthia Paula; Avena, Marcelo Javier; Highly efficient arsenic adsorption onto Mg/Al/Fe layered double hydroxides: Kinetics, isotherm, XPS and Mössbauer spectroscopies; Elsevier; Journal of Water Process Engineering; 56; 12-2023; 1-11
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