Thermal treatment of activated carbon fibres (ACF) has been carried out using a microwave device, instead of a conventional
furnace. The results show that microwave treatment affects the porosity of the ACFs, causing a reduction in micropore volume and
micropore size. More importantly, the results also show that microwave treatment is a very effective method for modifying the
surface chemistry of the ACFs with the production of pyrone groups, detected by FTIR. As a result very basic carbons, with points
of zero charge approximately equal to 11, are readily obtained.