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Cr(VI) Sorption/Desorption on Pine Sawdust and Oak Wood Ash.

Núñez-Delgado A, Fernández-Sanjurjo MJ, Álvarez-Rodríguez E, Cutillas-Barreiro L, Nóvoa-Muñoz J, Arias-Estévez M - Int J Environ Res Public Health (2015)

Bottom Line: The objective of this work was to study Cr(VI) sorption/desorption on two by-products from the wood industry: pine sawdust and oak wood ash.Sorption curves were well fitted to the Freundlich and Lineal models.In view of the results, both materials can be considered of very limited value to remove Cr from polluted soil and water, which can be of relevance regarding its appropriate use as biosorbents and recycled by-products.

View Article: PubMed Central - PubMed

Affiliation: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, Lugo 27002, Spain. avelino.nunez@usc.es.

ABSTRACT
The objective of this work was to study Cr(VI) sorption/desorption on two by-products from the wood industry: pine sawdust and oak wood ash. The retention/release experiments were carried out using standard batch-type trials. In the sorption-phase experiments, pine sawdust showed 23% sorption when a concentration of 100 mg Cr(VI)ŸL-1 was added, whereas sorption on oak wood ash was 17%. In the desorption-phase, chromium release was clearly higher from pine sawdust than from oak wood ash (98% and 66%, respectively). Sorption curves were well fitted to the Freundlich and Lineal models. In view of the results, both materials can be considered of very limited value to remove Cr from polluted soil and water, which can be of relevance regarding its appropriate use as biosorbents and recycled by-products.

No MeSH data available.


pH value in relation to the Cr adsorbed concentrations in oak wood ash and pine sawdust.
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ijerph-12-08849-f003: pH value in relation to the Cr adsorbed concentrations in oak wood ash and pine sawdust.

Mentions: Figure 3 shows that, in the case of oak wood ash and pine sawdust, pH values hardly changed when Cr sorption increased. However, other authors observed pH increases as a function of increasing anion sorption that caused OH− release, as was the case for fluoride [24,38,39] In the present study, mechanisms that do not implicate OH− release, such as H and Van der Waals bindings, could be of importance in relation to Cr(VI) sorption [34].


Cr(VI) Sorption/Desorption on Pine Sawdust and Oak Wood Ash.

Núñez-Delgado A, Fernández-Sanjurjo MJ, Álvarez-Rodríguez E, Cutillas-Barreiro L, Nóvoa-Muñoz J, Arias-Estévez M - Int J Environ Res Public Health (2015)

pH value in relation to the Cr adsorbed concentrations in oak wood ash and pine sawdust.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555251&req=5

ijerph-12-08849-f003: pH value in relation to the Cr adsorbed concentrations in oak wood ash and pine sawdust.
Mentions: Figure 3 shows that, in the case of oak wood ash and pine sawdust, pH values hardly changed when Cr sorption increased. However, other authors observed pH increases as a function of increasing anion sorption that caused OH− release, as was the case for fluoride [24,38,39] In the present study, mechanisms that do not implicate OH− release, such as H and Van der Waals bindings, could be of importance in relation to Cr(VI) sorption [34].

Bottom Line: The objective of this work was to study Cr(VI) sorption/desorption on two by-products from the wood industry: pine sawdust and oak wood ash.Sorption curves were well fitted to the Freundlich and Lineal models.In view of the results, both materials can be considered of very limited value to remove Cr from polluted soil and water, which can be of relevance regarding its appropriate use as biosorbents and recycled by-products.

View Article: PubMed Central - PubMed

Affiliation: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, Lugo 27002, Spain. avelino.nunez@usc.es.

ABSTRACT
The objective of this work was to study Cr(VI) sorption/desorption on two by-products from the wood industry: pine sawdust and oak wood ash. The retention/release experiments were carried out using standard batch-type trials. In the sorption-phase experiments, pine sawdust showed 23% sorption when a concentration of 100 mg Cr(VI)ŸL-1 was added, whereas sorption on oak wood ash was 17%. In the desorption-phase, chromium release was clearly higher from pine sawdust than from oak wood ash (98% and 66%, respectively). Sorption curves were well fitted to the Freundlich and Lineal models. In view of the results, both materials can be considered of very limited value to remove Cr from polluted soil and water, which can be of relevance regarding its appropriate use as biosorbents and recycled by-products.

No MeSH data available.