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Abstract
The porous activated carbons (ACs) were prepared from corn grains through physical (steam) and chemical–physical (H3PO4‐steam) activations. The effects of steam activation temperature (700–900 °C) on pore development, surface roughness, and energetic heterogeneity were investigated in both activations. Also, the effect of prior carbonization on H3PO4‐steam activation was studied. The physical properties, surface fractal dimensions, and adsorption energy distributions of ACs were determined from nitrogen adsorption–desorption isotherm data. Both physical and chemical–physical activations show that the AC with higher surface area, relatively smoother surface, and energetically heterogeneous surface could be produced at a maximum steam activation temperature (900 °C). Copyright © 2015 John Wiley & Sons, Ltd.
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