A series of 2D/2D heterojunction photocatalysts were constructed by a facile in situ solvothermal method that a tetragonal SnS2 nanosheets was horizontal loaded in ultrathin g-C3N4. Compared to pure g-C3N4, both the SnS2/g-C3N4 heterojunctions and Ag/C3N4 revealed a noteworthy improvement of the photocatalytic activity for NO removal under visible light. For high flux simulated flue gas (NO 60 ppm, two magnitude higher than the reported), with 10wt% SnS2 addition, the SnS2/g-C3N4 heterojunction shows supreme NO removal efficiency (up to 48.9%) and excellent reusability in five degradation-regeneration cycles. While Ag/C3N4 (1wt% Ag) revealed 76% NO removal. Density functional theory calculations have been performed to provide an explanation for our experimental data. The negative surface formation energy, high charge transfer, and strong non-bonding interaction via electrostatic forces confirm the stability of the SnS2/g-C3N4 interface. Transient adsorption test and EPR spectra of Ag/C3N4 was indetifeid the exitation of interfacial electrons The results show that g-C3N4 based catalysts have a promising prospect in flue gas purification due to its high efficiency and excellent stability.

Mechanistic study on photocatalytic oxidation of high concentration NO over g-C3N4 based 2D materials: An experimental and theoretical approach

ACS Spring Meeting 2021

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