The Adsorption Properties of Bacillus atrophaeus Spores on Single-Wall Carbon Nanotubes

Abstract EN

An adsorption equilibrium and a kinetic study of Bacillus atrophaeus on Single-Wall Carbon Nanotubes (SWCNTs) were here performed to provide the basis for developing biosensor devices for detecting threatening micro-organisms in water supply systems.

B.

atrophaeus spores and carbon nanotubes were subjected to a batch adsorption process to document their equilibria and kinetics.

Here, commercial nanotubes were either studied as received or were acid-purified before adsorption experiments.

The Bacillus spores appear to show higher affinity towards the purified nanotubes than to the as-received nanomaterial.

The effective diffusivity of the spores onto the purified nanotubes was found to be approximately 30 percent higher than onto the as-received nanotubes.

It seems that the removal of amorphous carbon from the as-received nanotubes through a purification process yielded an intimate nantoubes-spore interaction as revealed by transmission electron microscopy.

Freundlich model successfully correlated the adsorption equilibrium data for the nanotubes-spore interaction.

Transmission electron micrographs showed extensive contact between the Bacillus and the purified nanotubes, but the association appeared less intimate between the spores and the as-received nanotubes.