| Summary: | This study developed and examined the application of bismuth sulfide doped on graphitic carbon nitride (Bi<sub>2</sub>S<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub>) in the degradation of NO under solar irradiation. Bi<sub>2</sub>S<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub> was prepared through the calcination method. The morphological structure and chemical properties of the synthesized photocatalyst were analyzed before the degradation tests. After doping with Bi<sub>2</sub>S<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub>, the bandgap was reduced to 2.76 eV, which increased the absorption of solar light. As a result, the Bi<sub>2</sub>S<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub> achieved higher NO degradation (55%) compared to pure Bi<sub>2</sub>S<sub>3</sub> (35%) and g-C<sub>3</sub>N<sub>4</sub> (45%). The trapping test revealed that the electrons were the primary species responsible for most of the NO degradation. The photocatalyst was stable under repeated solar irradiation, maintaining degradation efficiencies of 50% after five consecutive recycling tests. The present work offers strong evidence that Bi<sub>2</sub>S<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub> is a stable and efficient catalyst for the photocatalytic oxidation of NO over solar irradiation.
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