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(A) Schematic illustration of KOH activation of already carbonized mask fibers to induce microporosity and increase the surface area. (B) N2 adsorption isotherm of carbonized mask fibers after the activation process. The isotherm indicates the increased surface area compared to the neat, carbonized fibers. (C) Dye adsorption study at a concentration of 0.15 mg/mL investigating the adsorption capacities as a function of time of activated carbon fibers compared to PAC.
