Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics
In this work, the adsorption of arsenic (V) onto crystalline substituted goethites was studied for samples with different Sn- contents. The highest Sn-content of the prepared samples was 5.5 (expressed as 100?[Sn]/[Sn]+[Fe]) as all attempts to prepare goethites with higher tin content only rendered...
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International Journal of Innovative Research in Engineering & Management
2015
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| Acceso en línea: | https://ri.unsam.edu.ar/handle/123456789/996 |
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I78-R216-123456789-9962023-03-27T19:58:11Z Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics Larralde, Ana Laura Tufo, Ana Elisabeth Morando, Pedro Juan Sileo, Elsa Ester ARSENIC ADSORPTION THERMAL STABILITY SPECIFIC SURFACE AREA CIENCIAS QUÍMICA CIENCIAS NATURALES Y EXACTAS info:eu-repo/semantics/publishedVersion In this work, the adsorption of arsenic (V) onto crystalline substituted goethites was studied for samples with different Sn- contents. The highest Sn-content of the prepared samples was 5.5 (expressed as 100?[Sn]/[Sn]+[Fe]) as all attempts to prepare goethites with higher tin content only rendered amorphous materials. The Sn-for-Fe substitution caused changes on the physico-chemical properties of the obtained samples, and the thermal analysis indicated that the formed Sn-goethites were metal-deficient goethites with increased thermal stabilization towards decomposition to hematite. BET surface analysis evidenced the presence of large mesoporous or macroporous in all samples and the following trend in SSA values: GSn5.5 (54.90±0.08) > GSn0 (25.75±0.09) > GSn2.1 (17.19±0.05 m2g-1). The As(V) adsorption presented a maximum at pH = 5.50 ± 0.05 for all samples and the data showed that GSn5.5 nearly duplicates the amount of As adsorbed per gram of pure goethite. To evaluate the chemical stability of the samples, dissolution kinetics measurements in acidic conditions were also performed. Dissolution rate followed the trend GSn2.1 > GSn0 > GSn5.5. The facts that GSn5.5 dissolves slower than the pure sample and that adsorbs twice as much as pure goethite indicate that GSn5.5 is a promising agent for As(V) removal technologies. Fil: Larralde, Ana Laura. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina Fil: Tufo, Ana Elisabeth. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina Fil: Morando, Pedro Juan. Comisión Nacional de Energía Atómica; Argentina. Universidad Nacional de San Martín; Argentina Fil: Sileo, Elsa Ester. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina 2015-11 info:eu-repo/semantics/article info:ar-repo/semantics/artículo Larralde, A. L.; Tufo, A. E.; Morando, P. J.; Sileo, E. E. (nov 2015). Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics; International Journal of Innovative Research in Engineering & Management; International Journal of Innovative Research in Engineering & Management; 2 (6) 63-70 2350-0557 https://ri.unsam.edu.ar/handle/123456789/996 eng info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Creative Commons Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5) application/pdf pp. 63-70 application/pdf International Journal of Innovative Research in Engineering & Management International Journal of Innovative Research in Engineering & Management http://www.ijirem.org/IJIREM/ArchInfo.aspx?rep=95 |
| institution |
Universidad Nacional de General San Martín |
| institution_str |
I-78 |
| repository_str |
R-216 |
| collection |
Repositorio Institucional de la UNSAM |
| language |
Inglés |
| topic |
ARSENIC ADSORPTION THERMAL STABILITY SPECIFIC SURFACE AREA CIENCIAS QUÍMICA CIENCIAS NATURALES Y EXACTAS |
| spellingShingle |
ARSENIC ADSORPTION THERMAL STABILITY SPECIFIC SURFACE AREA CIENCIAS QUÍMICA CIENCIAS NATURALES Y EXACTAS Larralde, Ana Laura Tufo, Ana Elisabeth Morando, Pedro Juan Sileo, Elsa Ester Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| topic_facet |
ARSENIC ADSORPTION THERMAL STABILITY SPECIFIC SURFACE AREA CIENCIAS QUÍMICA CIENCIAS NATURALES Y EXACTAS |
| description |
In this work, the adsorption of arsenic (V) onto crystalline substituted goethites was studied for samples with different Sn- contents. The highest Sn-content of the prepared samples was 5.5 (expressed as 100?[Sn]/[Sn]+[Fe]) as all attempts to prepare goethites with higher tin content only rendered amorphous materials. The Sn-for-Fe substitution caused changes on the physico-chemical properties of the obtained samples, and the thermal analysis indicated that the formed Sn-goethites were metal-deficient goethites with increased thermal stabilization towards decomposition to hematite. BET surface analysis evidenced the presence of large mesoporous or macroporous in all samples and the following trend in SSA values: GSn5.5 (54.90±0.08) > GSn0 (25.75±0.09) > GSn2.1 (17.19±0.05 m2g-1). The As(V) adsorption presented a maximum at pH = 5.50 ± 0.05 for all samples and the data showed that GSn5.5 nearly duplicates the amount of As adsorbed per gram of pure goethite. To evaluate the chemical stability of the samples, dissolution kinetics measurements in acidic conditions were also performed. Dissolution rate followed the trend GSn2.1 > GSn0 > GSn5.5. The facts that GSn5.5 dissolves slower than the pure sample and that adsorbs twice as much as pure goethite indicate that GSn5.5 is a promising agent for As(V) removal technologies. |
| format |
publishedVersion Artículo Artículo |
| author |
Larralde, Ana Laura Tufo, Ana Elisabeth Morando, Pedro Juan Sileo, Elsa Ester |
| author_facet |
Larralde, Ana Laura Tufo, Ana Elisabeth Morando, Pedro Juan Sileo, Elsa Ester |
| author_sort |
Larralde, Ana Laura |
| title |
Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| title_short |
Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| title_full |
Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| title_fullStr |
Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| title_full_unstemmed |
Enhanced As (V) Adsorption Properties in Sn-Substituted Goethites - Changes in Chemical Reactivity and Surface Characteristics |
| title_sort |
enhanced as (v) adsorption properties in sn-substituted goethites - changes in chemical reactivity and surface characteristics |
| publisher |
International Journal of Innovative Research in Engineering & Management |
| publishDate |
2015 |
| url |
https://ri.unsam.edu.ar/handle/123456789/996 |
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| _version_ |
1765722566612221952 |