Removal of Benzoic Acid by Catalytic Ozonation with CeO_2 Loaded on N, S Co-Doped Activated Carbon Catalyst

摘要

N, S co-doped activated carbon (ACNS) was obtained by modification with thiourea and cerium oxide supported on activated carbon (Ce/AC, and Ce/ACNS) were prepared and worked as catalyst for catalytic ozonation of benzoic acid. The catalysts were characterized by elemental analysis, N_2 adsorption-desorption, the pH at the point of zero charge (pH_(pzc)),) and X-ray photoelectron spectroscopy (XPS). In contrast with Ce/AC, Ce/ACNS increased the catalytic activity. The enhanced catalytic performance was attributed to the presence of the N and S atoms may improve the electron density on AC surface and therefore enhance the amount of Ce~(3+) on catalyst surface.