Abstract:
Arsenic derived from natural and anthropogenic sources occurs in groundwater, and its mobility is highly influenced by goethite and ferrihydrite. As the substitution of Al-for-Fe in natural goethites is well documented, our aim was to explore the adsorption of As(V) onto several Al-substituted goethites, and to analyze by STEM micrographs the possible formation of FeAsO4 as a surface precipitate that blocks ulterior sorption. Adsorption isotherms ([As]adsorbed vs. [As]solution) of all samples were obtained, and an uncommon bell shaped curve with a maximum at 0.25 mM was found for all goethites. The STEM micrographs of the As-adsorbed Al-goethites were obtained at [As] > 0.25 mM and confirmed that no surface precipitates were formed. Based on these results, the formation of bidentated complexes were proposed to explain the decrease of the adsorption by As(V) coordination to two metal sites. © 2014 Taylor & Francis Group.
Registro:
| Documento: |
Conferencia
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| Título: | Influence of the Al-for-Fe substitution in the adsorption of As(V) onto goethites-morphological surface characterization |
| Autor: | Tufo, A.E.; Marchi, M.C.; Dos Santos Afonso, M.; Sileo, E.E.; Landi, S.M. |
| Ciudad: | Buenos Aires |
| Filiación: | INQUIMAE, Facultad de Ciencias Exactas, Universidad de Buenos Aires, Buenos Aires, Argentina
Centro de Microscopías Avanzadas, Facultad de Ciencias Exactas, Universidad de Buenos Aires, Buenos Aires, Argentina
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Divisão de Metrologia de Materiais, RJ, Brazil
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| Palabras clave: | Adsorption; Arsenic; Coordination reactions; Groundwater; Precipitates; Al-substituted goethites; Anthropogenic sources; Bell-shaped curves; Ferrihydrites; Metal sites; Natural goethites; Surface characterization; Surface precipitate; Aluminum |
| Año: | 2014
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| Página de inicio: | 699
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| Página de fin: | 701
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| Título revista: | 5th International Congress on Arsenic in the Environment, As 2014
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| Título revista abreviado: | One Century Discov. Arsenicosis Latin America: As - Proc. Int. Congr. Arsenic Environ.
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97811380_v_n_p699_Tufo |
Referencias:
- Abdullah, M., Reis, M., Probable role of nutrition on arsenic toxicity (1998) In International Conf. On Arsenic Pollution of Ground Water in Bangladesh: Causes, Effects and Remedies, pp. 8-12
- Aguilar, J., Dorronsoro, C., Fernández, E., Fernández, J., García, I., Martín, F., Sierra, M., Simón, M., Remediation of As-Contaminated Soils in the Guadiamar River Basin (2007) Water, Air & Soil Pollution, 180, pp. 271-281
- Dixit, S., Hering, J.G., Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: Implications for arsenic mobility (2003) Environ. Sci. Technol., 37, pp. 4182-4189
- Farrell, J., Chaudhary, B.K., Understanding Arsenate Reaction Kinetics with Ferric Hydroxides (2013) Environ. Sci. Technol., 47, pp. 8342-8347
- Fendorf, S., Eick, M.J., Grossl, P., Sparks, D.L., Arsenate and chromate retention mechanisms on goethite (1997) 1. Surface Structure. Environ. Sci. Technol., 31 (2), pp. 315-320
- Manning, B., Goldberg, S., Modeling Competitive Adsorption of Arsenate with Phosphate and Molybdate on Oxide Minerals (1996) Soil Sci. Soc. Am. J., 60, pp. 121-131
- Schwertmann, U., Cornell, R.M., (2000) Iron Oxides in the Laboratory, Preparation and Characterization, 2nd Ed., , Wiley-VCH, Weinheim, Germany
- Wang, S., Mulligan, C.N., Occurrence of arsenic contamination in Canada: Sources (2006) Behavior and Distribution. J. Hazard. Mater., 138, pp. 459-470A4 - et al.; National Atomic Energy Commission (CNEA); National Research and Technology Council (CONICET); The Argentine Foundation of Nanotechnology; The National University of Buenos Aires (UBA); The National University of San Martin (UNSAM)
Citas:
---------- APA ----------
Tufo, A.E., Marchi, M.C., Dos Santos Afonso, M., Sileo, E.E. & Landi, S.M.
(2014)
. Influence of the Al-for-Fe substitution in the adsorption of As(V) onto goethites-morphological surface characterization. 5th International Congress on Arsenic in the Environment, As 2014, 699-701.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97811380_v_n_p699_Tufo [ ]
---------- CHICAGO ----------
Tufo, A.E., Marchi, M.C., Dos Santos Afonso, M., Sileo, E.E., Landi, S.M.
"Influence of the Al-for-Fe substitution in the adsorption of As(V) onto goethites-morphological surface characterization"
. 5th International Congress on Arsenic in the Environment, As 2014
(2014) : 699-701.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97811380_v_n_p699_Tufo [ ]
---------- MLA ----------
Tufo, A.E., Marchi, M.C., Dos Santos Afonso, M., Sileo, E.E., Landi, S.M.
"Influence of the Al-for-Fe substitution in the adsorption of As(V) onto goethites-morphological surface characterization"
. 5th International Congress on Arsenic in the Environment, As 2014, 2014, pp. 699-701.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97811380_v_n_p699_Tufo [ ]
---------- VANCOUVER ----------
Tufo, A.E., Marchi, M.C., Dos Santos Afonso, M., Sileo, E.E., Landi, S.M. Influence of the Al-for-Fe substitution in the adsorption of As(V) onto goethites-morphological surface characterization. One Century Discov. Arsenicosis Latin America: As - Proc. Int. Congr. Arsenic Environ. 2014:699-701.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97811380_v_n_p699_Tufo [ ]
