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<p>The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C<sub>3</sub>N<sub>4</sub> being a leading photocatalyst candidate. However, the application of conventional bulk g-C<sub>3</sub>N<sub>4</sub> is limited by its low specific surface area, high rates of photogenerated carrier recombination, and limited utilization of visible light. This study presents a novel synthetic approach, termed “thermal polymerization-acidification-annealing,” that uses urea to prepare modified g-C<sub>3</sub>N<sub>4</sub> samples. Notably, the CN-3 sample has a coral-like porous structure, which significantly increases its specific surface area and reduces the bandgap, thereby improving its photocatalytic performance. Under 100&#xa0;min of visible light irradiation, the CN-3 sample achieved a 95.5% reduction of U(VI) in solution, which is 2.5 times more efficient than conventional g-C<sub>3</sub>N<sub>4</sub>. The material also demonstrated excellent stability and reusability, maintaining nearly 90% reduction in U(VI) after five consecutive photocatalytic cycles. These results highlight the importance of morphological engineering for enhancing the photocatalytic performance of g-C<sub>3</sub>N<sub>4</sub> and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.</p>

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Acid-Etched g-C3N4 for efficient photocatalytic U(VI) reduction and environmental remediation

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Ye’an Zhu,
  • Jialin Qiu,
  • Zimeng Zhang,
  • Yidan Nie,
  • Bo Wang,
  • Li Peng,
  • Zengkai Song,
  • Zongbo Xie,
  • Zhanggao Le

摘要

The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C3N4 being a leading photocatalyst candidate. However, the application of conventional bulk g-C3N4 is limited by its low specific surface area, high rates of photogenerated carrier recombination, and limited utilization of visible light. This study presents a novel synthetic approach, termed “thermal polymerization-acidification-annealing,” that uses urea to prepare modified g-C3N4 samples. Notably, the CN-3 sample has a coral-like porous structure, which significantly increases its specific surface area and reduces the bandgap, thereby improving its photocatalytic performance. Under 100 min of visible light irradiation, the CN-3 sample achieved a 95.5% reduction of U(VI) in solution, which is 2.5 times more efficient than conventional g-C3N4. The material also demonstrated excellent stability and reusability, maintaining nearly 90% reduction in U(VI) after five consecutive photocatalytic cycles. These results highlight the importance of morphological engineering for enhancing the photocatalytic performance of g-C3N4 and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.