Abstract
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.
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