Abstract
Sustainable methods for wastewater treatment offer promising solutions to address pressing environmental challenges. This study investigates the potential of graphitic carbon nitride (g- C3N4) as an environmentally friendly photocatalyst for wastewater treatment. The research involves the systematic exploration of various precursors (melamine, urea, and dicyanamide), different polymerization temperatures (500, 550, and 600 °C), and varying K-doping levels (1 %, 3 %, and 5 % KOH), providing valuable insights into the properties of g-C3N4. This study marks a significant advancement by reporting, for the first time, the successful degradation of 1,3-Diphenylguanidine (DPG) in wastewater. UCN-K1, a urea-derived g-C3N4 doped with 1 % KOH, displayed exceptional performance, achieving nearly 95 % DPG removal within 6 h under solar radiation and utilizing a remarkably low dose (0.1 g/L). Furthermore, the research offers a comprehensive understanding of reaction kinetics, a detailed analysis of K-doping effects, and profound insights into the degradation mechanism of DPG, including potential transformation products.
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