Facilitated Photocatalytic Degradation of Rhodamine B over One-Step Synthesized Honeycomb-Like BiFeO/g-CN Catalyst.

In the present work, a facile one-step methodology was used to synthesize honeycomb-like BiFeO/g-CN composites, where the well-dispersed BiFeO strongly interacted with the hg-CN. The 10BiFeO/hg-CN could completely degrade RhB under visible light illumination within 60 min. The degradation rate constant was remarkably improved and approximately three times and seven times that of pristine hg-CN and BiFeO, respectively. This is ascribed to the following factors: (1) the unique honeycomb-like morphology facilitates the diffusion of the reactants and effectively improves the utilization of light energy by multiple reflections of light; (2) the charged dye molecules can be tightly bound to the spontaneous polarized BiFeO surface to form the Stern layer; (3) the Z-scheme heterojunction and the ferroelectric synergistically promoted the efficient separation and migration of the photogenerated charges. This method can synchronously tune the micro-nano structure, surface property, and internal field construction for g-CN-based photocatalysts, exhibiting outstanding potential in environmental purification.