Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 376, Issue 1-3, Pages 21-30Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.08.017
Keywords
MgO center dot SiO2 oxide composite; Pigment hybrids; Surface functionalisation; Surface area; Zeta potential; Electrophoretic mobility
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The paper reports on obtaining and characterisation of functionalised oxide system MgO center dot SiO2. The synthetic oxide system was obtained by the classical precipitation method performed with the use of sodium silicate and a certain magnesium salt. The most important problem was the functionalisation of the system's surface with selected organic compounds. In this study the silane proadhesive compounds containing characteristic functional groups like amino and glicydoxy ones, were used. The MgO center dot SiO2 surface functionalisation with silanes can be applied as the process preceding adsorption of organic dyes to ensure getting stable hybrid pigments of wide use. The pigment hybrids were obtained with two organic dyes C.I. Acid Yellow 17 (acidic one) and C.I. Basic Blue 9 (basic one). The functionalised MgO center dot SiO2 systems and pigment hybrids obtained on their basis were thoroughly characterised to determine the yield of functionalisation with silanes and adsorption of the dyes. The characterisation included determination of the dispersion and morphology of the systems (particle size distribution, SEM images), adsorptive properties (BET isotherms) and electrokinetic properties (zeta potential and electrophoretic mobility). The effectiveness of the surface functionalisation and dye adsorption was tested using FT-IR. (C) 2010 Elsevier B.V. All rights reserved.
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