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Artículo

Influence of functionalization, surface area and charge distribution of SBA15-based adsorbents on CO (II) and NI (II) removal from aqueous solutions

Rodríguez Estupiñán, Paola; Legnoverde, María SoledadIcon ; Simonetti, Sandra IsabelIcon ; Díaz Compañy, Andres Carlos Daniel; Juan, AlfredoIcon ; Giraldo, Liliana; Moreno Piraján, Juan Carlos; Basaldella, Elena Isabel
Fecha de publicación: 04/2020
Editorial: Elsevier
Revista: Journal of Environmental Chemical Engineering
ISSN: 2213-3437
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería de los Materiales

Resumen

Amino functionalized solids were obtained by anchoring ethoxysilane and ethylenediaminetetraacetic groups onto the surface of a mesostructured silica SBA-15. The materials were characterized by nitrogen adsorptiondesorption, Fourier transform infrared spectroscopy (FTIR), and potentiometric titration. The samples SBA-15, SBA-15 -NH2 and SBA-15-EDTA were tested in the simple and competitive adsorption of Co (II) and Ni (II) ions from aqueous solutions. The equilibrium data were analyzed using the Langmuir isotherm by nonlinear regression analysis. The influence of textural and chemical characteristics of the three different silicas on Co (II) and Ni (II) removal was also studied. A complementary study based on density functional theory was performed. Adsorption isotherms of Ni and Co fitted well with Langmuir model, exhibiting high adsorption capacity of 47.7 and 27.4 mg of metal/g of SBA-15, 62.9 and 59.7 mg of metal/g of SBA-15-NH2 and 74 and 67.7 mg of metal/g of SBA-15-EDTA, respectively, in simple adsorption tests. In the case of adsorption from binary solutions, both cations compete for the same active sites, a preferential Ni adsorption being shown. A detailed data analysis demonstrated that EDTA functionalization allows the best retention efficiency of both heavy metals from their corresponding aqueous solution.
Palabras clave: SBA-15 , METAL IONS , SIMPLE AND COMPETITIVE ADSORPTION , POTENTIOMETRIC TITRATION , AMINO GROUPS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/121266
URL: https://www.sciencedirect.com/science/article/abs/pii/S2213343720300191
DOI: https://doi.org/10.1016/j.jece.2020.103671
Colecciones
Articulos(CINDECA)
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Articulos(IFISUR)
Articulos de INSTITUTO DE FISICA DEL SUR
Citación
Rodríguez Estupiñán, Paola; Legnoverde, María Soledad; Simonetti, Sandra Isabel; Díaz Compañy, Andres Carlos Daniel; Juan, Alfredo; et al.; Influence of functionalization, surface area and charge distribution of SBA15-based adsorbents on CO (II) and NI (II) removal from aqueous solutions; Elsevier; Journal of Environmental Chemical Engineering; 8; 2; 4-2020; 103671-103679
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