By A K Haghi
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Additional info for Foundations of Nanotechnology, Volume One: Pore Size in Carbon-Based Nano-Adsorbents
The kinetics of adsorption followed the pseudo second-order kinetic model and equilibrium data were best fitted to Freundlich adsorption isotherm. The adsorption capacity of G–MCNTs is much higher than MCNTs. Therefore, G–CNTs hybrid could be used as an efficient adsorbent for environmental remediation [72–73]. 5 CNT-CF (PAN) AS ADSORBENT In order to combine carbon nanotubes with carbon fibers, most studies report the direct synthesis of carbon nanotubes on carbon fibers by CVD (chemical vapor deposition) with special attention paid to the control of CNT length, diameter and density as well as arrangement and anchorage on carbon fibers.
The substrate can be reused after depositing new catalyst particles on the surface. The length of the nanotube arrays increases with the growth time, and reaches about 2 mm after 48h growth . GAS PHASE METAL CATALYST: In the methods described above, the metal catalysts are deposited or embedded on the substrate before the deposition of the carbon begins. A new method is to use a gas phase for introducing the catalyst, in whichboth the catalyst and the hydrocarbon gas are fed into a furnace, followed by catalytic reaction in the gas phase.
The ‘grafting-to’ method is based on attachment of premade end-functionalized polymer onto the tips and convex walls of the nanotubes via chemical reactions such as etherification and amidization. One advantage of this method is that the mass and distribution of the grafted polymers can be more precisely controlled. However, initial grafted polymer chains sterically prevent diffusion of additional polymer chains to the nanotube surface resulting in low grafting density. The ‘grafting-from’ method is based on immobilization of reactive groups (initiators) onto the surface, followed by in situ polymerization of appropriate monomers to form polymer-grafted nanotubes.
Foundations of Nanotechnology, Volume One: Pore Size in Carbon-Based Nano-Adsorbents by A K Haghi