Activated carbon powders from wool fibers

Activated carbon powders (ACPs) with unique morphologies were prepared from wool fibers by chemical activation at different carbonization temperatures and impregnation ratios. These materials were characterized by elemental analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), adsorption/desorption of N2 and methylene blue (MB) adsorption. The surface properties of the activated carbon powders (ACPs) were significantly influenced by the activation temperature and activation process. ACPs activated by 2-step K2CO3 (K2CO3/char value of 2) at 600 °C had a high surface area (438 m2 g− 1), and a large pore volume (0.197 cm2 g− 1) with an average pore diameter of 0.858 nm. They were also very efficient in the adsorption of MB.

Solid wool fibers (a) have been converted into activated carbon particles (b, c, d), which exhibit unique tubular morphology as a result of the bi-component cuticle/cortex structure of wool. The chemical reagents and temperatures used in the conversion process have a significant effect on the pore structure and adsorption behavior of the activated carbon powders.Figure optionsDownload as PowerPoint slideHighlights
► First report on producing activated carbon particles from wool fibers.
► The activated materials have unique tubular morphology.
► Activation conditions have significant effects on carbon particle properties.