Two-dimensional (2D) structure g-C3N4 was prepared via thermal oxidation etching at
different temperatures. Under simulated solar illumination, the photocatalytic properties of
catalysts were estimated by degrading tetracycline (TC). Owing to the enlarged specific
surface area, 2D g-C3N4 nanosheets demonstrated superior photocatalytic performance.
Furthermore, as the temperature increased, the degradation efficiency also increased. When
bulk g-C3N4 was exfoliated at 525°C, the highest degradation efficiency of TC reached
84.0%.