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Nitrogen adsorption/desorption isotherm of magnetic lignite (1) and magnetic char (2). Solid datapoints in the isotherm correspond to the data from adsorption isotherm, and open datapoints correspond to the data from the desorption isotherm. Top left inset: pore-size distribution for magnetic lignite (1) and magnetic char (2) and their precursors, lignite (3) and char (4), derived from the desorption isotherms. STP, standard temperature and pressure (t = 0 °C and p = 101.325 kPa).
