陕西科技大学董国辉团队报道了煤矸石优化g-C3N4的形貌及其光催化降解四环素。相关研究成果于2023年12月20日发表在《结构化学》。

煤矸石是煤炭开采和加工产生的固体废物，其对环境的影响引起了人们的关注。石墨碳氮化物（g-C₃N₄）在光催化分解有机污染物方面有很大的前景，但其固有的缺陷阻碍了其性能。

该文中，通过在煤矸石表面原位负载g-C₃N₄，形成了煤矸石与g-C₃N₄的化合物。重组后，g-C₃N₄的形态从嵌段结构转变为银耳纳米片。这种变化不仅增加了g-C₃N₄的比表面积，而且拓宽了g-C₃N₃的光吸收光谱。与原来的g-C₃N₄相比，该复合物在可见光下的光电流增加了2倍，四环素的降解速度快了2.1倍。通过一系列表征技术，分析了该复合材料的结构、光学性能、能带结构、形貌和电荷转移机理。研究发现，煤矸石能促进g-C₃N₄的空间电荷转移和分离。该环状试验化合物具有良好的活性稳定性。

该文提出了煤矸石综合利用的策略。该策略不仅可以降低煤矸石的环境风险，而且可以提供具有优异光催化性能的氮化碳基光催化材料。

附：英文原文

Title: Morphology and photocatalytic tetracycline degradation of g-C3N4 optimized by the coal gangue

Author: anonymous

Issue&Volume: 2023-12-20

Abstract: Coal gangue, a solid waste from coal mining and processing, has raised concerns about its environmental impact. Graphitic carbon nitride (g-C3N4) is promising for photocatalytic decomposition of organic pollutants, but its performance is hampered by its inherent defects. In this study, the compound of coal gangue and g-C3N4 was formed by in-situ loading g-C3N4 on the surface of coal gangue. After recombination, the morphology of g-C3N4 changes from block structure to tremella nanosheet. This change not only increases the specific surface area of g-C3N4, but broadens the light absorption spectrum of g-C3N4. Compared with the original g-C3N4, the photocurrent of the complex in visible light increased by 2 times, and the tetracycline degradation rate was 2.1 times faster. The structure, optical properties, band structure, morphology and charge transfer mechanism of the composite were analyzed by a series of characterization techniques. It was found that coal gangue can promote the space charge transfer and separation of g-C3N4. The cyclic test compound has good activity stability. In this paper, a strategy of comprehensive utilization of coal gangue is proposed. This strategy can not only reduce the environmental risk of coal gangue, but provide carbon nitride based photocatalytic materials with superior photocatalytic properties.

DOI: 10.1016/j.cjsc.2023.100208

Source: http://cjsc.ac.cn/cms/issues/543