Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Piastow Ave. 42, 71-065 Szczecin, Poland.
Int J Mol Sci. 2021 Dec 3;22(23):13096. doi: 10.3390/ijms222313096.
In this contribution, the effect of hydrogenation conditions atmosphere (temperature and time) on physicochemical properties and photocatalytic efficiency of graphitic carbon nitride (g-CN, gCN) was studied in great details. The changes in the morphology, chemical structure, optical and electrochemical properties were carefully investigated. Interestingly, the as-modified samples exhibited boosted photocatalytic degradation of Rhodamine B (RhB) with the assistance of visible light irradiation. Among modified gCN, the sample annealed at 500 °C for 4 h (500-4) in H atmosphere exhibited the highest photocatalytic activity-1.76 times higher compared to pristine gCN. Additionally, this sample presented high stability and durability after four cycles. It was noticed that treating gCN with hydrogen at elevated temperatures caused the creation of nitrogen vacancies on gCN surfaces acting as highly active sites enhancing the specific surface area and improving the mobility of photogenerated charge carriers leading to accelerating the photocatalytic activity. Therefore, it is believed that detailed optimization of thermal treatment in a hydrogen atmosphere is a facile approach to boost the photoactivity of gCN.
在本研究中，详细研究了氢化条件气氛（温度和时间）对石墨相氮化碳（g-CN，gCN）的物理化学性质和光催化效率的影响。仔细研究了形貌、化学结构、光学和电化学性质的变化。有趣的是，在可见光照射下，改性后的样品表现出增强的罗丹明 B（RhB）光催化降解性能。在改性的 gCN 中，在 H2 气氛中于 500°C 下退火 4 小时（500-4）的样品表现出最高的光催化活性-比原始 gCN 高 1.76 倍。此外，该样品在经过四个循环后表现出高稳定性和耐用性。研究发现，在高温下用氢气处理 gCN 会导致 gCN 表面形成氮空位，这些氮空位作为高活性位点，提高了比表面积，并改善了光生载流子的迁移率，从而加速了光催化活性。因此，人们相信，在氢气气氛中详细优化热处理是提高 gCN 光活性的一种简便方法。
Zotero 插件
