Key words: phenol, activated carbon, adsorption, desorption, regeneration, sub- and supercritical water
The paper presents the research results of dynamic adsorption of phenol by activated carbon (AC) in the medium of liquid, sub- and supercritical water (26 °C, 0.1 MPa and 24—400 °C, 25 MPa) and subsequent regeneration of AC under similar conditions. It is shown that the adsorption—desorption isotherms are characterized by the presence of hysteresis. An increase in pressure at room temperature leads to an increase in the adsorption capacity, and an increase in temperature at 25 MPa leads to a decrease in it. The amount of phenol remaining in the AC after regeneration decreases with increasing temperature and does not depend on pressure. The relative average rate of phenol desorption increases sharply at T ≥ 200 °C. It was found that the greatest increase in the specific surface area and pore volume occurs when AC is treated with supercritical water.
doi:10.34984/SCFTP.2021.16.4.006