Using the stems of Dendrocalamus membranaceus Munro as raw materials, pyrolysis char BC-700 and hydrochar HBC-190/700 were prepared by the high-temperature pyrolysis method and the hydrothermal roasting method, respectively. Then, their benzene adsorption performance was evaluated at 55°C. The results showed that the adsorption effect of biochar HBC-190/700 on benzene was three times that of BC-700. Furthermore, the influence of preparation methods on the physical and chemical properties of the adsorbents was investigated using characterization techniques such as BET, XRD, SEM, Raman and FT-IR. SEM results indicated that many carbon microspheres were accumulated on the surface of hydrothermal carbon HBC-190/700, resulting in the formation of crevice pores. BET analysis showed that the hydrothermal carbon HBC-190/700 presented a hierarchical pore distribution of micropores and mesopores, which was conducive to the mass transfer of benzene. In addition, FT-IR analysis revealed that the aromatic functional groups of HBC-190/700 were the key factors for benzene adsorption.
