The adsorption behavior of C.I. Acid Blue 9 onto calcined Mg–Al layered double hydroxides

Auxilio, Anthony R.;Andrews, Philip C.;Junk, Peter C.;Spiccia, Leone

Abstract

Mesoporous calcined Mg–Al layered double hydroxides with different Mg/Al molar ratios were investigated for their ability to adsorb the commercial dye, C.I. Acid Blue 9, with a view to exploring their suitability as inorganic pigments in Ink Receptive Layer formulation. Uptake capacity was characterized using the Langmuir model and the resulting L-2/H-2 type plots indicated that the acid dye anions were adsorbed onto the surface by strong interactions. Optimum dye adsorption was achieved for a Mg/Al molar ratio ≈5.6. A surface adsorption mechanism is proposed to account for the adsorption of the dye onto the calcined Mg–Al layered double hydroxides. X-ray powder diffraction analysis indicated that given sufficient time it is possible to intercalate the dye within the layered double hydroxides' interlayer via a reconstruction mechanism. Scanning electron microscopy, N2 adsorption–desorption analysis and helium pycnometry were employed to examine the textural properties of the materials, which were correlated with their adsorption properties.

Journal

Dyes and Pigments

Publication Name

Dyes and Pigments

Volume

ISBN/ISSN

1873-3743

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Publisher

Elsevier

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DOI

10.1016/j.dyepig.2008.09.011