Green preparation of nitrogen vacancies enriched g-CN for efficient photocatalytic reduction of CO and Cr(VI).

Introducing vacancies has emerged as one of the valid strategies to modulate the photocatalytic performance of graphitic carbon nitride (g-CN). Introduction of nitrogen vacancies into g-CN can create defect energy levels and trap electrons, consequently accelerating the separation of e/h pairs and effectively boosting photocatalytic activity. Nitrogen vacancies can also serve as adsorption active sites, enhancing the adsorption capacity of the catalyst towards the target molecule (CO).