Highly porous carbon nitride by supramolecular preassembly of monomers for photocatalytic removal of sulfamethazine under visible light driven

- A general and green method was developed to prepare porous BCM-C3N4 nanosheets.
- Large surface area of BCM- C3N4 greatly promoted photogenerated charge separation.
- The BCM-C3N4 presented an enhancement in degradation and mineralization rate with 5 fold than the pristine g-C3N4.
- It is envisaged that this facile doping method can also be expanded to produce other 2D photocatalysts for environment applications.

Many organic and inorganic compounds have been developed as visible light driven photocatalysts for environment and energy application. In this work, a metal-free carbon doping-carbon nitride (BCM-C3N4) nanocomposite was synthesized by introducing barbituric acid and cyanuric acid during the polymerization of melamine. The BCM-C3N4 was characterized by structure, porosity, optical performance, and photoelectrochemical properties. Results demonstrated that BCM-C3N4 sample exhibited higher surface area, lower fluorescence intensity, better photocurrent signals and more efficient charge transfer in comparison to pure C3N4. The BCM-C3N4 exhibits excellent photocatalytic degradation ability of sulfamethazine (SMZ) under visible light irradiation. Much superior photocatalytic activity and high pollutant mineralization rate was achieved by BCM-C3N4, where it was 5 times than that of pristine C3N4. The effect of initial SMZ concentrations on photocatalyst was also investigated. Additionally, the trapping experiments and electron spin resonance tests demonstrated that the main active species, such as O2− and h+, could be produced under light irradiation. This work might provide an effective approach to the design of low-cost and highly efficient photocatalysis degradation systems for water treatment.

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