Abstract
Activated carbon monoliths have been obtained by the chemical activation of hemp canes with phosphoric acid. The effects of the carbonization temperature and the impregnation ratio on the porous structure and surface chemistry were studied. The porous structure of the activated carbon monoliths was characterized by N2 adsorption−desorption and CO2 adsorption isotherms. The surface chemistry of the carbons was analyzed by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS), and the surface morphology was analyzed by scanning electron microscopy (SEM). Water vapor adsorption kinetics and capacities of the activated carbon monoliths were studied. The surface properties of the activated carbons were found to be strongly dependent on the carbonization temperature and the impregnation ratio. An activated carbon monolith with an apparent surface area of about 1500 m2/g and a significant contribution of mesopores (mesopore volume of 0.6 cm3/g) was obtained at 400 °C with an impregna...
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