Dye adsorption onto mesoporous materials: PH influence, kinetics and equilibrium in buffered and saline media


Autoria(s): Gómez, J. M.; Galán, J.; Rodríguez, A.; Walker, G. M.
Data(s)

05/12/2014

Resumo

<p>Mesoporous materials were used as adsorbents for dye removal in different media: non-ionic, buffered and saline. The mesoporous materials used were commercial (silica gel) as well as as-synthesised materials (SBA-15 and a novel mesoporous carbon). Dye adsorption onto all the materials was very fast and the equilibrium was reached before 1h. The pH has a significant influence on the adsorption capacity for the siliceous materials since the electrostatic interactions are the driving forces. However, the influence of the pH on the adsorption capacity of the carbonaceous material was lower, since the van der Waals interactions are the driving forces. The ionic strength has a great impact on the siliceous materials adsorption capacity, being their adsorption capacity in a buffered medium six times higher than the corresponding to a non-ionic medium. Nevertheless, ionic strength does not influence on the dye adsorption on the mesoporous carbon. Overall, the as-synthesised carbon material presents a clear potential to treat dye effluents, showing high adsorption capacity (q<sub>e</sub>≈200mg/g) in all the pH range studied (from 3 to 11); even at low concentrations (C<sub>e</sub>≈10mg/L) and at short contact times (t<sub>e</sub><30min).</p>

Identificador

http://pure.qub.ac.uk/portal/en/publications/dye-adsorption-onto-mesoporous-materials-ph-influence-kinetics-and-equilibrium-in-buffered-and-saline-media(92f0dfc4-6369-4c1c-b4d0-bf03abc10408).html

http://dx.doi.org/10.1016/j.jenvman.2014.07.041

http://www.scopus.com/inward/record.url?scp=84908698450&partnerID=8YFLogxK

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Gómez , J M , Galán , J , Rodríguez , A & Walker , G M 2014 , ' Dye adsorption onto mesoporous materials: PH influence, kinetics and equilibrium in buffered and saline media ' Journal of Environmental Management , vol 146 , pp. 355-361 . DOI: 10.1016/j.jenvman.2014.07.041

Palavras-Chave #Adsorption #Buffer #Dye #Ionic strength #Mesoporous
Tipo

article