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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| Formato: | Texto completo |
| Idioma: | Inglés |
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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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ds-123456789-996 |
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Repositorio Institucional |
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RI |
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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 |
| 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 |
Texto completo |
| 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 |
| work_keys_str_mv |
AT larraldeanalaura enhancedasvadsorptionpropertiesinsnsubstitutedgoethiteschangesinchemicalreactivityandsurfacecharacteristics AT tufoanaelisabeth enhancedasvadsorptionpropertiesinsnsubstitutedgoethiteschangesinchemicalreactivityandsurfacecharacteristics AT morandopedrojuan enhancedasvadsorptionpropertiesinsnsubstitutedgoethiteschangesinchemicalreactivityandsurfacecharacteristics AT sileoelsaester enhancedasvadsorptionpropertiesinsnsubstitutedgoethiteschangesinchemicalreactivityandsurfacecharacteristics |
| _version_ |
1747968978581454848 |