Hybrid pigments preparation via adsorption of C.I. Mordant Red 3 on both unmodified and aminosilane–functionalised silica supports

The adsorption of C.I. Mordant Red 3 on the surface of silica both unmodified and modified with N-2-(aminoethyl)-3-aminopropyltrimethoxysilane was studied. The efficiency of C.I. Mordant Red 3 adsorption on silica and the adsorptive properties of inorganic support were characterised. The particle size distribution and the surface morphology of the pigments obtained were determined, their physico-chemical properties were characterised and the colorimetric analysis was performed. The degree of silica support coverage with the organic dye was estimated on the basis of elemental analysis. The presence of functional groups on silica and on the pigments was verified with the FT–IR analysis.