Acid-Etched g-C3N4 for efficient photocatalytic U(VI) reduction and environmental remediation
The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C 3 N 4 being a leading photocatalyst candidate. However, the application of conventional bulk g-C 3 N 4 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 3 N 4 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-C 3 N 4 . 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 3 N 4 and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.
危险品化学品经营许可证（带存储）