Abstract Graphitic carbon nitride (g-C3N4) has emerged as a remarkably promising photocatalyst for addressing environmental and energy issues; however, it exhibits only moderate photocatalytic activity because of its low specific surface area and high recombination of carriers. Preparation of crystalline g-C3N4 by the molten salt method has proven to be an effective method to improve the photocatalytic activity. However, crystalline g-C3N4 prepared by the conventional molten salt method exhibits a less regular morphology. Herein, highly crystalline g-C3N4 hollow spheres (CCNHS) were successfully prepared by the molten salt method using cyanuric acid-melamine as a precursor. The higher crystallization of the CCNHS samples not only repaired the structural defects at the surface of the CCNHS samples but also established a built-in electric field between heptazine-based g-C3N4 and triazine-based g-C3N4. The hollow structure improved the level of light energy utilization and increased the number of active sites for photocatalytic reactions. Because of the above characteristics, the as-prepared CCNHS samples simultaneously realized photocatalytic hydrogen evolution with the degradation of the plasticizer bisphenol A. This research offers a new perspective on the structural optimization of supramolecular self-assembly.

中文翻译：

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具有增强光催化性能的高结晶氮化碳空心球

摘要 石墨氮化碳 (g-C3N4) 已成为解决环境和能源问题的一种非常有前途的光催化剂。然而，由于其低比表面积和高载流子复合，它仅表现出中等的光催化活性。通过熔盐法制备结晶g-C3N4已被证明是提高光催化活性的有效方法。然而，通过常规熔盐法制备的结晶 g-C3N4 表现出较不规则的形态。在此，以氰尿酸-三聚氰胺为前驱体，通过熔盐法成功制备了高度结晶的g-C3N4空心球（CCNHS）。CCNHS 样品的较高结晶度不仅修复了 CCNHS 样品表面的结构缺陷，而且还在庚嗪基 g-C3N4 和三嗪基 g-C3N4 之间建立了内置电场。中空结构提高了光能利用水平，增加了光催化反应活性位点的数量。由于上述特点，所制备的CCNSS样品在降解增塑剂双酚A的同时实现了光催化析氢。该研究为超分子自组装的结构优化提供了新的视角。