Abstract
Microporous and mesoporous nanocomposites based on silica and titanate are obtained by unrolling sodic titanate nanotubes. The opened titanate sheets are then spaced by introducing surfactant species via ion exchange and introducing silica species between the unrolled titanate nanotubes. The characterization indicates an organic–inorganic hybrid intermediate resulting from the surfactant in perpendicular accommodation between the open tubular sheets. Stabilizing the silica spacers resulted in a microporous and mesoporous nanoarchitecture forming voids between the unrolled titanate sheets with a higher specific surface (714 m2 g–1) than that of the pristine titanate nanotube (58 m2 g–1). The adsorptive properties of the synthesized silica–titanate nanoarchitectures are reported using Methylene Blue (MB) and Rhodamine B (RhB) dyes. It was revealed that the adsorption capacity against RhB is substantially increased for the nanocomposite (65%), compared to titanate nanotubes (13%). The kinetic analysis suggests that the pseudo-second-order kinetic model best describes the adsorption dynamics. Freundlich adsorption isotherm best fits the adsorption data, which suggests that adsorption does not occur onto uniform sites but in multilayers onto nanocomposites.
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