Abstract
The g-C3N4/Bi5O7I photocatalyst with a hierarchical porous nanostructure (CB-HPN) was successfully synthesized via one-step calcination method. The materials were characterized by XRD, SEM, XPS and PL to investigate the properties of porous nanostructure. The mercury removal efficiency of g-C3N4/Bi5O7I reached up to 80.3%, which was much higher than that of Bi5O7I. It was found that the hierarchical porous nanostructure could modulate the interface charge transfer tracks efficiently and increase the ratio of active factors, thus accelerating photocatalytic oxidation of gaseous mercury (Hg0). Based on the characterization and experiment analysis, a reasonable charge transfer and reaction mechanism for Hg0 oxidation is proposed.
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