Z-scheme photocatalytic NO removal on a 2D/2D iodine doped BiOIO/g-CN under visible-light irradiation.

We report an unique 2D/2D Iodine doped BiOIO/g-CN heterojunction was successfully prepared. The iodine doped BiOIO was prepared by a simple solvent exchange method and combined with g-CN by solvothermal method. The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO nanoplates and g-CN nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light, of which 30% Iodine doped BiOIO/g-CN can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.