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Adsorption of Methylene Blue on magnesium silicate: kinetics, equilibria and comparison with other adsorbents.
Ferrero, Franco.
Afiliación
  • Ferrero F; Department of Materials Science and Chemical Engineering, Polytechnic of Torino, Corso Duca degli Abruzzi 24, I10129 Torino, Italy. franco.ferrero@polito.it
J Environ Sci (China) ; 22(3): 467-73, 2010.
Article en En | MEDLINE | ID: mdl-20614792
ABSTRACT
Batch adsorption from aqueous solutions in a slightly basic medium of Methylene Blue, up to 2500 mg/L, onto synthetic magnesium silicate (Florisil) of three particle size ranges (mean diameters of 112, 200 and 425 microm) was compared to the corresponding adsorption onto activated carbon and Amberlite XAD-2. The best fit of the kinetic results was achieved by a pseudo second-order equation. The equilibrium data were found to be well represented by the Langmuir isotherm equation. Amberlite XAD-2, an unspecific adsorbent capable of adsorbing exclusively through a surface effect, exhibited a poor dye uptake, confirming that the adsorption mechanism on Florisil was due to electrostatic attraction and ion exchange. Moreover, the comparison between Florisil and the other adsorbents was performed on the basis of the evaluation of the surface area and pore volume occupied by the adsorbed dye.
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Bases de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Silicatos de Magnesio / Colorantes / Azul de Metileno Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2010 Tipo del documento: Article País de afiliación: Italia
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Bases de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Silicatos de Magnesio / Colorantes / Azul de Metileno Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2010 Tipo del documento: Article País de afiliación: Italia