Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China.
J Hazard Mater. 2020 Feb 15;384:121247. doi: 10.1016/j.jhazmat.2019.121247. Epub 2019 Sep 20.
As an environmentally friendly and promising semiconductor, graphitic carbon nitride (g-CN) was widely used in photocatalytic treatment of aqueous organic pollutants. In this study, cobalt-to-oxygen doped graphitic carbon nitride with feeble nitrogen vacancies (Co-OCN) as metal-to-ligand charge transfer was synthesized via a facile thermal polymerization method with low cost and non-toxic precursors. The oxygen doped graphitic carbon nitride with feeble nitrogen vacancies (OCN) ligand was successfully formed and cobalt was presented in OCN in an ionic form (in the form of Co-N). The cobalt atoms were chemically coordinated to the OCN matrix rather than forming cobalt oxide on the surface of OCN. The embedded cobalt atoms maintained the absorption margin of ligand OCN (up to 700 nm) and served as the separation centers to promote the interfacial electron transfer as well. Due to the synergistic effects of the embedded cobalt atoms and oxygen doping, the Co-OCN showed an outstanding activity for the visible-light photocatalytic oxidation of endocrine disruptor bisphenol A (BPA).
作为一种环保且有前景的半导体，石墨相氮化碳（g-CN）被广泛应用于水中有机污染物的光催化处理。在这项研究中，通过一种简便的热聚合方法，使用低成本且无毒的前驱体合成了具有较弱氮空位的钴掺杂氧石墨相氮化碳（Co-OCN）作为金属-配体电荷转移。成功形成了氧掺杂石墨相氮化碳和具有较弱氮空位的（OCN）配体，钴以离子形式（Co-N 形式）存在于 OCN 中。钴原子与 OCN 基质发生化学配位，而不是在 OCN 表面形成氧化钴。嵌入的钴原子保持了配体 OCN 的吸收边缘（高达 700nm），并作为分离中心促进界面电子转移。由于嵌入钴原子和氧掺杂的协同作用，Co-OCN 表现出对内分泌干扰物双酚 A（BPA）的可见光光催化氧化的优异活性。
