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<p>Ultra-thin g-C<sub>3</sub>N<sub>4</sub> nanosheets (CN-T-t) were successfully prepared via thermally exfoliating bulk g-C<sub>3</sub>N<sub>4</sub> (CN) at different temperatures (T) of 480, 490, 500, 510, 520 ℃, respectively, for 2 h, and at 500 ℃ for different times (t) of 0.5, 1, 1.5, 2h, respectively. The phase composition, microstructure, the photocatalytic degradation property, etc., of CN-T-t samples were studied systematically. The specific surface area of the CN-T-t samples increased with the enhancement of thermal exfoliation temperature and time. The absorption edges of all CN-T-t samples presented blueshift after thermally exfoliating, but their absorption edges were close to each other. Compared with the CN sample, CN-T-t samples exhibited the improved photocatalytic performance. Among them, CN-500-2 (0.1 g) demonstrated the superior photocatalytic properties, which achieved 99.06% removal rate of Rhodamine B (RhB) (10 mg/L, 100 mL) within 30 min of visible light irradiation, with a reaction rate constant 13.9 times greater than that of CN. In addition, CN-500-2 presented excellent recyclability and stability after five cycles of photocatalytic degradation processes, among which h<sup>+</sup> and ·O<sub>2</sub><sup>−</sup> were the primary active species.</p>

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Effects of thermal exfoliation conditions on the microstructure and photocatalytic performance of g-C3N4 nanosheets

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Hongyu Li,
  • Yongqiang Niu,
  • Hongliang Xu,
  • Bo Song,
  • Wen Liu,
  • Mingliang Li,
  • Gang Shao,
  • Hongxia Lu,
  • Hailong Wang

摘要

Ultra-thin g-C3N4 nanosheets (CN-T-t) were successfully prepared via thermally exfoliating bulk g-C3N4 (CN) at different temperatures (T) of 480, 490, 500, 510, 520 ℃, respectively, for 2 h, and at 500 ℃ for different times (t) of 0.5, 1, 1.5, 2h, respectively. The phase composition, microstructure, the photocatalytic degradation property, etc., of CN-T-t samples were studied systematically. The specific surface area of the CN-T-t samples increased with the enhancement of thermal exfoliation temperature and time. The absorption edges of all CN-T-t samples presented blueshift after thermally exfoliating, but their absorption edges were close to each other. Compared with the CN sample, CN-T-t samples exhibited the improved photocatalytic performance. Among them, CN-500-2 (0.1 g) demonstrated the superior photocatalytic properties, which achieved 99.06% removal rate of Rhodamine B (RhB) (10 mg/L, 100 mL) within 30 min of visible light irradiation, with a reaction rate constant 13.9 times greater than that of CN. In addition, CN-500-2 presented excellent recyclability and stability after five cycles of photocatalytic degradation processes, among which h+ and ·O2− were the primary active species.