The surface area and porosity properties of the oxidized carbons
were determined by a Micrometrics apparatus (ASAP 2010) by adsorption
of nitrogen (N2) adsorption–desorption isotherms at −196 °C
(77 K) according to Brunauer Emmet and Teller (BET). Micropore
volume and micropore area were calculated by using the t-plot method
[15]