Abstract A novel metal-free oxygen-doped graphitic carbon nitride (O-g-C3N4) was synthesized by the pre-treatment of bulk graphitic carbon nitride (g-C3N4) with hydrogen peroxide (H2O2), and combined with high-temperature calcination treatment. The obtained 2-O-g-C3N4 catalyst exhibits high activity in visible light photocatalytic degradation of bisphenol A (BPA) with a mineralization rate as high as 62.3%. According to the characterization results of X-ray diffraction, transmission electron microscopy, UV-visible spectroscopy, Brunauer-Emmett-Teller and photoluminescence spectroscopy analyses, the markedly higher visible-light-driven oxidation activity of 2-O-g-C3N4 is attributed to the larger specific surface area, wider range of light responses and low charge recombination rate. Moreover, the trapping experiment shows that superoxide radicals (•O2−) are the dominant active species in the BPA decomposition process over 2-O-g-C3N4. This study presents a simple and environment-friendly method to synthesise oxygen-doped graphitic carbon nitride.

中文翻译：

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氧掺杂石墨氮化碳的制备及其可见光光催化降解双酚A性能

摘要采用过氧化氢（H2O2）对块状石墨氮化碳（g-C3N4）进行预处理，并结合高温煅烧处理，合成了一种新型无金属氧掺杂石墨氮化碳（Og-C3N4）。所得2-Og-C3N4催化剂在可见光光催化降解双酚A（BPA）方面表现出较高的活性，矿化率高达62.3%。根据X射线衍射、透射电子显微镜、紫外-可见光谱、Brunauer-Emmett-Teller和光致发光光谱分析的表征结果，2-Og-C3N4显着较高的可见光驱动氧化活性归因于更大的比表面积、更宽的光响应范围和更低的电荷复合率。此外，捕获实验表明，超氧自由基（·O2−）是BPA分解过程中2-Og-C3N4的主要活性物质。本研究提出了一种简单且环境友好的合成氧掺杂石墨碳氮化物的方法。