rGO/Fe-doped g-C3N4 visible-light driven photocatalyst with improved NO removal performance

Semiconductor photocatalytic technology has become a new green way to control NOx emissions. In order to remove NOx effectively, a multi-stage electron transport channel was constructed to improve the photocatalytic activity of graphitic carbon nitride (g-C3N4), which was realized by doping Fe ions and compounding with reductive graphene oxide (rGO) simultaneously. The results of NO removal test showed that the as-prepared rGO/Fe-doped g-C3N4 visible-light driven composite photocatalyst exhibited significantly improved photo catalytic activity, and the optimum mass ratio of rGO to Fe was 2:3. This was attributed to the positive synergistic effect of Fe and rGO and the formation of a multi-stage electron transport channel between rGO and protonated Fe-doped g-C3N4 (Fe-C3N4), which further accelerated the separation and transfer of photo-induced carriers, broadened the visible light response range and enhanced the light absorption intensity. This work develops a g-C3N4-based visible-light photocatalyst that can effectively remove NO and provides a new perspective for the modification of photocatalyst.