The preparation of pigment composites by adsorption of C.I. Mordant Red 11 and 9-aminoacridine on both unmodified and aminosilane-grafted silica supports

Pigment composites were obtained by adsorption of 9-aminoacridine and C.I. Mordant Red 11 onto silica supports which were both unmodified and also modified with N-2-(aminoethyl)-3-aminopropyltrimethoxysilane. The silica supports and pigment composites were characterised using particle size and polydispersity index, particle morphology and the presence of agglomerates, as well as sedimentation profile, water wettability and colorimetric parameters. The extent of silica surface coverage with each dye was determined on the basis of elemental analysis. The presence of functional groups on the silica support and the pigment composites was confirmed using FT-IR.